Z. Matysina, A. Zolotarenko, O. Zolotarenko, N. Shvachko, N. Akhanova, M. Ualkhanova, D. V. Schur, M. Gabdullin, Yuriy I. Zhirko, E. Rudakova, Yuriy O. Tarasenko, A. Zolotarenko, M. Chymbai, O. Havryliuk
The proposed work considers: hydrogen sorption properties of systems of magnesium intermetallic compounds with a complex cubic structure C15b, as promising, reliable, reversible hydrogen accumulators. Considered thermal processes. A statistical theory is proposed for the cubic structure C15b of composition MgRT4Hx, where R = Ce, La, Nd, Pr, Y; T = Co, Ni; 0 ≤ x ≤ 6 at phase transitions in the process of hydrogenation, taking into account pressure. The concentration dependences of the maximum values of the order parameter and a priori probabilities are established. Hydrogen solubility isopleths and isotherms are calculated and considered, and a graphical concentration dependence of the hydrogen atom ordering temperature in MgCeCo4-type crystals is created. The order-disorder transition is considered with allowance for temperature, and the process of absorption-desorption of hydrogen by the C15b structure is also studied. The equation of thermodynamic equilibrium with the calculation of free energy is derived. And also considered the graphical dependence of the value of the order parameter on temperature and pressure. The temperature dependence of hydrogen solubility in the α, β phases for the MgCeCo4 crystal is considered. The configurational heat capacity of a crystal of the MgSnCu4Hx type structure has been studied, taking into account the temperature and the order parameter. A graph of hydrogen absorption-desorption of the MgCeCo4Hx crystal has been constructed. A comparative analysis of the experimental and practical results of the absorption-desorption of hydrogen by the working fluid of the composition MgRT4Hx has been carried out.
{"title":"New magnesium intermetallic compounds are promising, reliable, reversible hydrogen accumulators","authors":"Z. Matysina, A. Zolotarenko, O. Zolotarenko, N. Shvachko, N. Akhanova, M. Ualkhanova, D. V. Schur, M. Gabdullin, Yuriy I. Zhirko, E. Rudakova, Yuriy O. Tarasenko, A. Zolotarenko, M. Chymbai, O. Havryliuk","doi":"10.15407/hftp14.03.415","DOIUrl":"https://doi.org/10.15407/hftp14.03.415","url":null,"abstract":"The proposed work considers: hydrogen sorption properties of systems of magnesium intermetallic compounds with a complex cubic structure C15b, as promising, reliable, reversible hydrogen accumulators. Considered thermal processes. A statistical theory is proposed for the cubic structure C15b of composition MgRT4Hx, where R = Ce, La, Nd, Pr, Y; T = Co, Ni; 0 ≤ x ≤ 6 at phase transitions in the process of hydrogenation, taking into account pressure. The concentration dependences of the maximum values of the order parameter and a priori probabilities are established. Hydrogen solubility isopleths and isotherms are calculated and considered, and a graphical concentration dependence of the hydrogen atom ordering temperature in MgCeCo4-type crystals is created. The order-disorder transition is considered with allowance for temperature, and the process of absorption-desorption of hydrogen by the C15b structure is also studied. The equation of thermodynamic equilibrium with the calculation of free energy is derived. And also considered the graphical dependence of the value of the order parameter on temperature and pressure. The temperature dependence of hydrogen solubility in the α, β phases for the MgCeCo4 crystal is considered. The configurational heat capacity of a crystal of the MgSnCu4Hx type structure has been studied, taking into account the temperature and the order parameter. A graph of hydrogen absorption-desorption of the MgCeCo4Hx crystal has been constructed. A comparative analysis of the experimental and practical results of the absorption-desorption of hydrogen by the working fluid of the composition MgRT4Hx has been carried out.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115466128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Vityuk, A. Eremenko, N. Rusinchuk, V. Lozovski, M. Lokshyn, V. Lysenko, I. Mukha
Gold nanoparticles (Au NPs) have found a variety of applications in different areas, particularly in biomedical practices. The activity of Au NPs strongly depends on the size and association of particles in colloid, that in turn are greatly affected by experimental parameters of the reaction. The obtaining of Au NPs even via classical procedure of citrate method can be a challenge. In the present work we applied different experimental approaches to affect the process of Au NPs formation in the presence of sodium citrate. Au NPs were obtained using different experimental procedures and varying the ratio of reagents, their concentrations, temperature of reaction, duration of heating, the order of introduction of reagents into the reaction mixture, pH, and so on. Comparative analyses of UV-vis spectra with DLS data by number, volume and intensity basis allowed to trace the changes in Au NPs colloid, find optimal experimental conditions and predict prolonged stability of colloids. Applying size-dependent Hamaker constant to DLVO theory explains experimental results. The formation of Au NPs strongly depends on the ratio of the functional groups of the molecule involved simultaneously in the reduction of metal ions, the binding to the surface of Au NPs and the formation of a charge for stabilization due to electrostatic repulsion. The change in the ratio of components is not enough to get a different size of Au NPs. Big concentration of the reagents mostly affects the aggregation process and colloid aging. Temperature is a critical activation factor, that should be about 100 °C, but prolonged heating causes collision induced aggregation. The initial stage of particles growth (the mechanism) can be affected with the change of pH of the system due to formation of deprotonated carboxyl groups and gold hydroxocomplexes.
{"title":"Formation and stability of gold nanoparticles in colloids prepared by citrate method","authors":"N. Vityuk, A. Eremenko, N. Rusinchuk, V. Lozovski, M. Lokshyn, V. Lysenko, I. Mukha","doi":"10.15407/hftp14.03.310","DOIUrl":"https://doi.org/10.15407/hftp14.03.310","url":null,"abstract":"Gold nanoparticles (Au NPs) have found a variety of applications in different areas, particularly in biomedical practices. The activity of Au NPs strongly depends on the size and association of particles in colloid, that in turn are greatly affected by experimental parameters of the reaction. The obtaining of Au NPs even via classical procedure of citrate method can be a challenge. In the present work we applied different experimental approaches to affect the process of Au NPs formation in the presence of sodium citrate. Au NPs were obtained using different experimental procedures and varying the ratio of reagents, their concentrations, temperature of reaction, duration of heating, the order of introduction of reagents into the reaction mixture, pH, and so on. Comparative analyses of UV-vis spectra with DLS data by number, volume and intensity basis allowed to trace the changes in Au NPs colloid, find optimal experimental conditions and predict prolonged stability of colloids. Applying size-dependent Hamaker constant to DLVO theory explains experimental results. The formation of Au NPs strongly depends on the ratio of the functional groups of the molecule involved simultaneously in the reduction of metal ions, the binding to the surface of Au NPs and the formation of a charge for stabilization due to electrostatic repulsion. The change in the ratio of components is not enough to get a different size of Au NPs. Big concentration of the reagents mostly affects the aggregation process and colloid aging. Temperature is a critical activation factor, that should be about 100 °C, but prolonged heating causes collision induced aggregation. The initial stage of particles growth (the mechanism) can be affected with the change of pH of the system due to formation of deprotonated carboxyl groups and gold hydroxocomplexes.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"239 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122773774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Gruzina, L. Rieznichenko, L. Yakubenko, V. I. Podolska, N. I. Grishchenko, Z. Ulberg, S. Dybkova
This research is aimed at the investigation the electrosurface and biochemical parameters of bacterial cells B. cereus B4368, L. plantarum, E. coli K-A, P. fluorescens B5040 under the influence of copper in ionic form and as nanoparticles in order to determine the nature and level of their toxic effect on bacteria. Copper nanoparticles synthesized in aqueous solution with NaBH4 and stabilized with dextran were used. Changes in membrane transport parameters were assessed by the value of ATPase activity; changes in transmembrane potential were assessed by the method of penetrating tetraphenylphosphonium cations (TPP+); and bacterial integrity was assessed by UV spectroscopy of cellular metabolites. A concentration-dependent inhibition of the membrane ATPase reaction and dissipation of the transmembrane potential under the action of both forms of copper was found, and the inhibitory effect in the case of the nanoparticles was on average 20 % higher than in the ionic form. As a result of heterocoagulation of dextran-stabilized copper nanoparticles and bacteria, a decrease in the negative ξ - potential of bacteria was observed, which was 40 % more effective under the action of copper nanoparticles compared to Cu2+ ions. The most significant changes in membrane parameters were observed in the range 10–60 μM of copper concentrations. With B. cereus B4368 cells taken as an example, we found a violation of the barrier function of their cell membrane under the influence of both copper preparations. In the case of copper nanoparticles, nucleic acid leakage from the bacterial cytoplasm was detected, which was confirmed by the absorption band at 260 nm. The results obtained indicate a high level of sensitivity of the studied electrosurface and biochemical parameters of bacterial cells to the effects of ionic and nanoparticle copper, which allows them to be used as indicators of the toxicity of metal nanoparticles in the development of metal-containing probiotic preparations.
{"title":"Research of toxic behavior of copper nanoparticles: effect on electrosurface and biochemical parameters of bacterial cells","authors":"T. Gruzina, L. Rieznichenko, L. Yakubenko, V. I. Podolska, N. I. Grishchenko, Z. Ulberg, S. Dybkova","doi":"10.15407/hftp14.03.372","DOIUrl":"https://doi.org/10.15407/hftp14.03.372","url":null,"abstract":"This research is aimed at the investigation the electrosurface and biochemical parameters of bacterial cells B. cereus B4368, L. plantarum, E. coli K-A, P. fluorescens B5040 under the influence of copper in ionic form and as nanoparticles in order to determine the nature and level of their toxic effect on bacteria. Copper nanoparticles synthesized in aqueous solution with NaBH4 and stabilized with dextran were used. Changes in membrane transport parameters were assessed by the value of ATPase activity; changes in transmembrane potential were assessed by the method of penetrating tetraphenylphosphonium cations (TPP+); and bacterial integrity was assessed by UV spectroscopy of cellular metabolites. A concentration-dependent inhibition of the membrane ATPase reaction and dissipation of the transmembrane potential under the action of both forms of copper was found, and the inhibitory effect in the case of the nanoparticles was on average 20 % higher than in the ionic form. As a result of heterocoagulation of dextran-stabilized copper nanoparticles and bacteria, a decrease in the negative ξ - potential of bacteria was observed, which was 40 % more effective under the action of copper nanoparticles compared to Cu2+ ions. The most significant changes in membrane parameters were observed in the range 10–60 μM of copper concentrations. With B. cereus B4368 cells taken as an example, we found a violation of the barrier function of their cell membrane under the influence of both copper preparations. In the case of copper nanoparticles, nucleic acid leakage from the bacterial cytoplasm was detected, which was confirmed by the absorption band at 260 nm. The results obtained indicate a high level of sensitivity of the studied electrosurface and biochemical parameters of bacterial cells to the effects of ionic and nanoparticle copper, which allows them to be used as indicators of the toxicity of metal nanoparticles in the development of metal-containing probiotic preparations.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133124581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article analyses some literature data and the authors’ developments in the technology of creating of therapeutic depots in the form of films, dispersions of metal oxides and textiles with immobilized biocompatible silver nanoparticles (NPs) in the structure of SiO2, TiO2, cotton, biopolymers (alginate, chitosan, lignin, etc.), that have biocidal action, and future trends in this area. We and other researchers have developed methods for the synthesis of photocatalytically active TiO2 and SiO2 films, modified with gold/silver/copper NPs, suitable for medical use. An economical and simple low-temperature methods of manufacturing antimicrobial textiles by photo- or thermal activation and the possibility of their multiple use have been developed. The production of biomedical textiles is recently focused on the widespread use of non-toxic biopolymers, combined with textile. We have obtained compositions based on nanodispersed silica with polysaccharide sodium alginate and silver NPs with pronounced hemostatic and bactericidal properties. Obtaining a hybrid material based on a bactericidal textile combined with a dispersed oxide is promising for additional absorption of toxins and wound cleaning. The creation of such universal multifunctional materials includes their high bactericidal and antiviral multiply use. Hybrid materials based on metal NPs in the structure of carriers of different nature as films and dispersions of biocompatible oxides, biopolymers, textiles have a protection against possible toxic effects of nanoparticles and metal ions, self-cleaning capability, photocatalytic, hemostatic properties, temperature resistance, and other. The development and application of such materials is growing rapidly. So, materials based on Ag/SiO2 dispersions have high antibacterial and antiviral action (single application). Ag/SiO2 films can act as durable antibacterial cover. There is an enhancement in the antibacterial properties of Ag-TiO2 NPs under visible light irradiation and the photocatalytic effect under UV light (single application in the powder form). Self-cleaning, antimicrobial and UV-protective properties have Ag-TiO2 NPs in textile. Cotton modified with MeNPs demonstrates high efficiency of destruction of bacteria E. coli, K. pneumoniae, E. aerogenes, P. vulgaris, S. aureus, C. albicans, etc., with saving of biocidal activity after 5 cycles of washing. The dynamics of silver ions release from the surface of NPs in the structure of textile upon their contact with water for 72 hours have been studied. The number of irreversibly bound particles in textile structure is sufficient for subsequent use. Modified fabrics are reusable. Composites based on metal NPs in the structure of silica or titania in the presence of biopolymers are effective hemostatic agents with a bactericidal effect. Sodium alginate has a reducing and stabilizing effect on nanoparticles, and silica prevents agglomeration of metal NPs in the resulting composite. However, i
{"title":"Targeted requirements for biomedical nanomaterials based on dispersed oxides and textiles modified with metal NPS","authors":"A. Eremenko, I. Petrik, A. Rudenko","doi":"10.15407/hftp14.03.300","DOIUrl":"https://doi.org/10.15407/hftp14.03.300","url":null,"abstract":"This article analyses some literature data and the authors’ developments in the technology of creating of therapeutic depots in the form of films, dispersions of metal oxides and textiles with immobilized biocompatible silver nanoparticles (NPs) in the structure of SiO2, TiO2, cotton, biopolymers (alginate, chitosan, lignin, etc.), that have biocidal action, and future trends in this area. We and other researchers have developed methods for the synthesis of photocatalytically active TiO2 and SiO2 films, modified with gold/silver/copper NPs, suitable for medical use. An economical and simple low-temperature methods of manufacturing antimicrobial textiles by photo- or thermal activation and the possibility of their multiple use have been developed. The production of biomedical textiles is recently focused on the widespread use of non-toxic biopolymers, combined with textile. We have obtained compositions based on nanodispersed silica with polysaccharide sodium alginate and silver NPs with pronounced hemostatic and bactericidal properties. Obtaining a hybrid material based on a bactericidal textile combined with a dispersed oxide is promising for additional absorption of toxins and wound cleaning. The creation of such universal multifunctional materials includes their high bactericidal and antiviral multiply use. Hybrid materials based on metal NPs in the structure of carriers of different nature as films and dispersions of biocompatible oxides, biopolymers, textiles have a protection against possible toxic effects of nanoparticles and metal ions, self-cleaning capability, photocatalytic, hemostatic properties, temperature resistance, and other. The development and application of such materials is growing rapidly. So, materials based on Ag/SiO2 dispersions have high antibacterial and antiviral action (single application). Ag/SiO2 films can act as durable antibacterial cover. There is an enhancement in the antibacterial properties of Ag-TiO2 NPs under visible light irradiation and the photocatalytic effect under UV light (single application in the powder form). Self-cleaning, antimicrobial and UV-protective properties have Ag-TiO2 NPs in textile. Cotton modified with MeNPs demonstrates high efficiency of destruction of bacteria E. coli, K. pneumoniae, E. aerogenes, P. vulgaris, S. aureus, C. albicans, etc., with saving of biocidal activity after 5 cycles of washing. The dynamics of silver ions release from the surface of NPs in the structure of textile upon their contact with water for 72 hours have been studied. The number of irreversibly bound particles in textile structure is sufficient for subsequent use. Modified fabrics are reusable. Composites based on metal NPs in the structure of silica or titania in the presence of biopolymers are effective hemostatic agents with a bactericidal effect. Sodium alginate has a reducing and stabilizing effect on nanoparticles, and silica prevents agglomeration of metal NPs in the resulting composite. However, i","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116434888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Karachevtseva, M. Kartel, Y. Sementsov, O. Lytvynenko, O. Sapelnikova
We investigated influence of multiwalled carbon nanotubes (CNTs) on spectral characteristics of composites “thermo-expanded graphite – carbon nanotubes (TEG–CNTs)”. The introduction of CNTs in an amount of 0-3% by weight of TEG composites results in a significant increase in the strength characteristics and thermal stability of the composites. This result indicates that CNTs is ideal filler for composites based on TEG compositions and structures. Measurements the giant two-polar oscillations with very small half-width 0.5 cm–1 testify the strong interaction of surface polaritons with photons. When frequencies of local oscillations of surface bonds of carbon nanotubes and modes along “nanotube-TEG” boundaries matches, then the light absorption increases 102–105 times. Thus, IR absorption with two-polar oscillations was measured at 0% of nanotubes in TEG at frequency of 2750 cm–1. It is own optical mode in the thermally expanded graphite. 5 peaks with two-polar oscillations were measured in the IR absorption spectra at 1% of carbon nanotubes. And 8 peaks with two-polar oscillations were measured at 3 % of carbon nanotubes at optical mode frequencies along the boundaries of thermally expanded graphite - carbon nanotubes. When frequencies of local oscillations of carbon nanotubes and composite’s modes matches, then the light absorption extremely increases (in 102–105 times), and two-polar IR absorption oscillations with negative components are formed. In general, two-photon interference is a result of quantum entanglement of dipole-active oscillations and splitting of photons according to the Hong-Ou-Mendel (HOM) quantum effect. Two-photon entanglement is built on the basis of the most entanglement states, also known as Bell's states. The HOM–quantum effect on composites “expanded graphite-carbon nanotubes” is promising for the development of highly coherent optical quantum computers.
{"title":"Hong-Ou-Mandel quantum effect on “expanded graphite - cnts” composites","authors":"L. Karachevtseva, M. Kartel, Y. Sementsov, O. Lytvynenko, O. Sapelnikova","doi":"10.15407/hftp14.03.387","DOIUrl":"https://doi.org/10.15407/hftp14.03.387","url":null,"abstract":"We investigated influence of multiwalled carbon nanotubes (CNTs) on spectral characteristics of composites “thermo-expanded graphite – carbon nanotubes (TEG–CNTs)”. The introduction of CNTs in an amount of 0-3% by weight of TEG composites results in a significant increase in the strength characteristics and thermal stability of the composites. This result indicates that CNTs is ideal filler for composites based on TEG compositions and structures. Measurements the giant two-polar oscillations with very small half-width 0.5 cm–1 testify the strong interaction of surface polaritons with photons. When frequencies of local oscillations of surface bonds of carbon nanotubes and modes along “nanotube-TEG” boundaries matches, then the light absorption increases 102–105 times. Thus, IR absorption with two-polar oscillations was measured at 0% of nanotubes in TEG at frequency of 2750 cm–1. It is own optical mode in the thermally expanded graphite. 5 peaks with two-polar oscillations were measured in the IR absorption spectra at 1% of carbon nanotubes. And 8 peaks with two-polar oscillations were measured at 3 % of carbon nanotubes at optical mode frequencies along the boundaries of thermally expanded graphite - carbon nanotubes. When frequencies of local oscillations of carbon nanotubes and composite’s modes matches, then the light absorption extremely increases (in 102–105 times), and two-polar IR absorption oscillations with negative components are formed. In general, two-photon interference is a result of quantum entanglement of dipole-active oscillations and splitting of photons according to the Hong-Ou-Mendel (HOM) quantum effect. Two-photon entanglement is built on the basis of the most entanglement states, also known as Bell's states. The HOM–quantum effect on composites “expanded graphite-carbon nanotubes” is promising for the development of highly coherent optical quantum computers.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127363851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Zahornyi, O. Lavrynenko, O. Pavlenko, O. Povnitsa, L. Artiukh, K. Naumenko, S. Zahorodnia, A. Ievtushenko
Today, the antiviral activity of oxide nanomaterials can be used in the fight against the viral disease COVID-19. It is thought that Ag nanoparticles may bind to the surface glycoprotein of the virus and interfere with the virus’s interaction with epithelial cells, and inhibit virus reproduction by releasing silver ions in the cell. The viruses’ inhibition with RNA (ribonucleic acid) and DNA (deoxyribonucleic acid) genomes by oxide nanocomposites action was presented. In this research, the surface structure of doped CeO2 (La2O3) was studied by nitrogen adsorption-desorption based on BET method. The silver atom’s existence in CeO2 - Ag0 can facilitate the transport of more holes to the surface and can enhance the optical, antivirus activity. The primary particle size of pure cerium dioxide is 7 nm, for CeO2 - Ag composite at 2 and 4 wt. % of silver is 6.5 and 6.9 nm; for La2O3 - Ag 27 and 35 nm, respectively. Cell viability was assessed using an MTT (3-(4,5-Dimethylthiazol 2-yl)-2,5-diphenyltetrazolium bromide) assay after NPs (nanoparticles) exposure, since only viable cells have functional mitochondrial dehydrogenase enzymes that can reduce MTT to formazan. Nanoparticles were non-toxic for BHK-21(Syrian hamster kidney), Hep-2 (Human larynx carcinoma), and MDCK (Canine kidney) cells in concentrations of 10 and 100 μg/ml, while cell viability was within 76÷100 %. La2O3 and CeO2, which contained 4 wt. % of Ag at a concentration of 1000 μg/ml had a lower toxic effect: for BHK-21 cells 68 and 76 % of viable cells, respectively; for Hep-2 - 40 and 36 %, for MDCK - 42 and 48 %; La2O3 and CeO2 with 2 and 5 wt. % of Ag at a concentration of 1000 µg/ml were highly toxic. The level of ВНК-21, Нер-2, and MDCK cells viability was in a range of 7 to 37 %. It has been stated that oxides of cerium and lanthanum have a pronounced virucidal action against the Herpes simplex virus and Influenza A virus by completely inhibiting the development of its cytopathic action. The lanthanum and cerium oxides with 2 and 5 wt. % of silver inhibited the development of the virus’s CPE by more than 5.0 log10 compared to the virus control. The results show that lanthanum and cerium oxides with 2 and 5 wt. % silver have a high virucidal effect against herpes simplex virus type 1. A 1.0÷4.0 log10 reduction in the infectious titer of the Herpes virus synthesized “de novo” in the presence of lanthanum and cerium oxide nanocomposites has been shown.
{"title":"The antiviral activity of cerium and lanthanum nanooxides modified with silver","authors":"M. Zahornyi, O. Lavrynenko, O. Pavlenko, O. Povnitsa, L. Artiukh, K. Naumenko, S. Zahorodnia, A. Ievtushenko","doi":"10.15407/hftp14.02.262","DOIUrl":"https://doi.org/10.15407/hftp14.02.262","url":null,"abstract":"Today, the antiviral activity of oxide nanomaterials can be used in the fight against the viral disease COVID-19. It is thought that Ag nanoparticles may bind to the surface glycoprotein of the virus and interfere with the virus’s interaction with epithelial cells, and inhibit virus reproduction by releasing silver ions in the cell. The viruses’ inhibition with RNA (ribonucleic acid) and DNA (deoxyribonucleic acid) genomes by oxide nanocomposites action was presented. In this research, the surface structure of doped CeO2 (La2O3) was studied by nitrogen adsorption-desorption based on BET method. The silver atom’s existence in CeO2 - Ag0 can facilitate the transport of more holes to the surface and can enhance the optical, antivirus activity. The primary particle size of pure cerium dioxide is 7 nm, for CeO2 - Ag composite at 2 and 4 wt. % of silver is 6.5 and 6.9 nm; for La2O3 - Ag 27 and 35 nm, respectively. Cell viability was assessed using an MTT (3-(4,5-Dimethylthiazol 2-yl)-2,5-diphenyltetrazolium bromide) assay after NPs (nanoparticles) exposure, since only viable cells have functional mitochondrial dehydrogenase enzymes that can reduce MTT to formazan. Nanoparticles were non-toxic for BHK-21(Syrian hamster kidney), Hep-2 (Human larynx carcinoma), and MDCK (Canine kidney) cells in concentrations of 10 and 100 μg/ml, while cell viability was within 76÷100 %. La2O3 and CeO2, which contained 4 wt. % of Ag at a concentration of 1000 μg/ml had a lower toxic effect: for BHK-21 cells 68 and 76 % of viable cells, respectively; for Hep-2 - 40 and 36 %, for MDCK - 42 and 48 %; La2O3 and CeO2 with 2 and 5 wt. % of Ag at a concentration of 1000 µg/ml were highly toxic. The level of ВНК-21, Нер-2, and MDCK cells viability was in a range of 7 to 37 %. It has been stated that oxides of cerium and lanthanum have a pronounced virucidal action against the Herpes simplex virus and Influenza A virus by completely inhibiting the development of its cytopathic action. The lanthanum and cerium oxides with 2 and 5 wt. % of silver inhibited the development of the virus’s CPE by more than 5.0 log10 compared to the virus control. The results show that lanthanum and cerium oxides with 2 and 5 wt. % silver have a high virucidal effect against herpes simplex virus type 1. A 1.0÷4.0 log10 reduction in the infectious titer of the Herpes virus synthesized “de novo” in the presence of lanthanum and cerium oxide nanocomposites has been shown.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116786402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Myroniuk, D. Myroniuk, E. Maistruk, S. Kuryshchuk, A. Ievtushenko, I. M. Danylenko, V. Strelchuk, I. Koziarskyi
In presented work we have reported that polyvinylpyrrolidone (PVP) is suitable organic solvent for mechanical exfoliation of crystalline graphite to graphene in aqueous solution through kitchen blender technique. Morphological, structural and optical, properties of graphene samples were characterized by scanning electron microscopy, Raman scattering and UV-Visible spectroscopy. Scanning electron microscopy demonstrates folded morphology of graphene flakes with ~4 nm thickness. Raman scattering was revealed the high-quality graphene with low levels of defects after the exfoliation process of graphite/PVP dispersions. The G band at ~1582 cm−1 on Raman spectra is related with stretching vibrations of carbon atoms. The broadening of the G band is not observed, that indicated on absence of the basal plane defects in the graphene structure, which can be introduced during exfoliation by the kitchen blender. The ratio of the intensity of 2D and G bands equal to 1.66 (I2D/IG>1) and the value of 2D band full width at half maximum is 79.88 cm–1, indicated a few-layer graphene (FLG) structure. The defects quantity identified by the intensity ratio of the D and G bands, ID/IG is 0.18, significantly lower than that reported for graphene oxide with basal plane defects (> 1) and for sonication dispersed graphene (~ 0.6). The graphene dispersions were characterized by UV–Vis spectroscopy, minimum transmittance observed at around 270 nm is attributed to the π→π* transitions of aromatic C–C bonds in graphene. The optical transmittance minimum and the overall high transmittance decreasing values observed between 270 and 800 nm strongly suggest the presence of two-dimensional material in the dispersion, thus confirming the successful exfoliation of graphite to graphene by blending. We demonstrate the simple and nontoxic method to product high-quality FLG sheets, free from defects, using a kitchen blender and eco-friendly polyvinylpyrrolidone as an organic exfoliant.
{"title":"Mechanical exfoliation of graphite to graphene in polyvinylpyrrolidone aqueous solution","authors":"L. Myroniuk, D. Myroniuk, E. Maistruk, S. Kuryshchuk, A. Ievtushenko, I. M. Danylenko, V. Strelchuk, I. Koziarskyi","doi":"10.15407/hftp14.02.230","DOIUrl":"https://doi.org/10.15407/hftp14.02.230","url":null,"abstract":"In presented work we have reported that polyvinylpyrrolidone (PVP) is suitable organic solvent for mechanical exfoliation of crystalline graphite to graphene in aqueous solution through kitchen blender technique. Morphological, structural and optical, properties of graphene samples were characterized by scanning electron microscopy, Raman scattering and UV-Visible spectroscopy. Scanning electron microscopy demonstrates folded morphology of graphene flakes with ~4 nm thickness. Raman scattering was revealed the high-quality graphene with low levels of defects after the exfoliation process of graphite/PVP dispersions. The G band at ~1582 cm−1 on Raman spectra is related with stretching vibrations of carbon atoms. The broadening of the G band is not observed, that indicated on absence of the basal plane defects in the graphene structure, which can be introduced during exfoliation by the kitchen blender. The ratio of the intensity of 2D and G bands equal to 1.66 (I2D/IG>1) and the value of 2D band full width at half maximum is 79.88 cm–1, indicated a few-layer graphene (FLG) structure. The defects quantity identified by the intensity ratio of the D and G bands, ID/IG is 0.18, significantly lower than that reported for graphene oxide with basal plane defects (> 1) and for sonication dispersed graphene (~ 0.6). The graphene dispersions were characterized by UV–Vis spectroscopy, minimum transmittance observed at around 270 nm is attributed to the π→π* transitions of aromatic C–C bonds in graphene. The optical transmittance minimum and the overall high transmittance decreasing values observed between 270 and 800 nm strongly suggest the presence of two-dimensional material in the dispersion, thus confirming the successful exfoliation of graphite to graphene by blending. We demonstrate the simple and nontoxic method to product high-quality FLG sheets, free from defects, using a kitchen blender and eco-friendly polyvinylpyrrolidone as an organic exfoliant.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121292927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Investigating the formation of inversion layers (IL) at the Si-SiO2 interface in the manufacturing technology of silicon photodetectors, some dynamics of dislocations after isothermal annealing were revealed, which were absent in samples without inversion. After selective etching of samples with inversion layers, localization of dislocations on the periphery of responsive elements (RE) with accumulation of guard rings (GR) or other elements of n+-type topology outside the RE was observed. This testified to the movement of dislocations on the surface of the Si-SiO2 structures with IL in the direction of the periphery of the crystal during isothermal annealing, which contributed to a significant decrease in the density of structural defects in RE. The described phenomenon can be used to obtain highly doped defect-free silicon structures. Since the presence of dislocations or other violations of the crystal lattice negatively affect the parameters of the products. In the case of using the described phenomenon as a technological method of “cleaning” the surface of silicon structures, there is a need for controlled formation of IL. One of the methods of forming inversion layers can be thermal oxidation in hydrochloric acid vapors according to the principle of dry-wet-dry oxidation (for p-type silicon). Another method that does not require additional materials is the annealing of Si-SiO2 structures at a temperature of 900–950 Celsium degrees in a nitrogen atmosphere for ≥ 240 minutes. Inversion channels, in this case, will be formed due to the redistribution and diffusion of metal impurities in the oxide (which were introduced during previous thermal operations) to the Si-SiO2 interface. In the described case, these structural defects after annealing were localized in the GR, which is also an active element of the phododiodes, as it limits the dark current of the RE, accordingly, the dark current of the GR should also be low. To be able to implement this method, it is necessary to create passive n+-regions on the periphery of the crystals, limited by oxide, which will be the locations of defects after annealing. It can be both separate areas of arbitrary shape and a concentric ring outside the GR. Elements that will be the locations of defects on the periphery can be cut off at the stage of separating the substrates into crystals. After annealing, it is necessary to remove the IL and form an anti-reflective coating by any known method, since the presence of inversion channels contributes to the growth of dark currents. When examining the morphology of defect localization areas after annealing under high-magnification microscopes and with the help of an atomic force microscope, the formation of hexagonal and round defects, which are partial marginal Frank dislocation loops, was observed. The mechanism of dislocation movement described in this article has not been thoroughly studied by us and requires additional research, but it may be related to Cottrel
{"title":"Method of “cleaning” the surface of responsive elements of silicon p-i-n photodiodes from dislocations","authors":"M. Kukurudziak","doi":"10.15407/hftp14.02.182","DOIUrl":"https://doi.org/10.15407/hftp14.02.182","url":null,"abstract":"Investigating the formation of inversion layers (IL) at the Si-SiO2 interface in the manufacturing technology of silicon photodetectors, some dynamics of dislocations after isothermal annealing were revealed, which were absent in samples without inversion. After selective etching of samples with inversion layers, localization of dislocations on the periphery of responsive elements (RE) with accumulation of guard rings (GR) or other elements of n+-type topology outside the RE was observed. This testified to the movement of dislocations on the surface of the Si-SiO2 structures with IL in the direction of the periphery of the crystal during isothermal annealing, which contributed to a significant decrease in the density of structural defects in RE. The described phenomenon can be used to obtain highly doped defect-free silicon structures. Since the presence of dislocations or other violations of the crystal lattice negatively affect the parameters of the products. In the case of using the described phenomenon as a technological method of “cleaning” the surface of silicon structures, there is a need for controlled formation of IL. One of the methods of forming inversion layers can be thermal oxidation in hydrochloric acid vapors according to the principle of dry-wet-dry oxidation (for p-type silicon). Another method that does not require additional materials is the annealing of Si-SiO2 structures at a temperature of 900–950 Celsium degrees in a nitrogen atmosphere for ≥ 240 minutes. Inversion channels, in this case, will be formed due to the redistribution and diffusion of metal impurities in the oxide (which were introduced during previous thermal operations) to the Si-SiO2 interface. In the described case, these structural defects after annealing were localized in the GR, which is also an active element of the phododiodes, as it limits the dark current of the RE, accordingly, the dark current of the GR should also be low. To be able to implement this method, it is necessary to create passive n+-regions on the periphery of the crystals, limited by oxide, which will be the locations of defects after annealing. It can be both separate areas of arbitrary shape and a concentric ring outside the GR. Elements that will be the locations of defects on the periphery can be cut off at the stage of separating the substrates into crystals. After annealing, it is necessary to remove the IL and form an anti-reflective coating by any known method, since the presence of inversion channels contributes to the growth of dark currents. When examining the morphology of defect localization areas after annealing under high-magnification microscopes and with the help of an atomic force microscope, the formation of hexagonal and round defects, which are partial marginal Frank dislocation loops, was observed. The mechanism of dislocation movement described in this article has not been thoroughly studied by us and requires additional research, but it may be related to Cottrel","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128325355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Kudelko, L. Rozhdestvenska, L. Ponomarova, V. M. Оgenko
Anodic porous alumina has been studied and used as nanoscale structure, coating, template in different applications. The porous anodic alumina oxide could be described as numerous hexagonal cells and looks like cellular structure. In this work we report about results of study anodizing of aluminum with usage of electrolyte: “oxalic acid electrolyte-matter with carbon nanodots”. It was received anodic aluminum oxide-membrane with aluminum supporting; calcination was used as post treatment. The aluminum substrate allows one to fix the membrane in the cells. Methods: processes of anodizing was provided in 0.3M oxalic acid with addition of colloid system of carbon nanodots, temperature of process was controlled at range of 10 degree Celsius, aluminum foil (anode) and platinum plate (cathode) were used; thickness of aluminum foil was 0.1 µm; morphology and structure of anodic aluminum oxide-membrane were determined with usage of electron scanning microscope; the contact angle between the surface of anodic aluminum oxide-membrane and deionized water was measured with “drop” methodology. Calcium content was monitored with a conductometer. The content of proteins was determined with photometry (micro Lowry’s method). It was found that contact angle of the surface of anodic aluminum oxide-membrane obtained in electrolyte “oxalic acid-matter with carbon nanodots” and deionized water is 38 degrees. Adding colloidal system of carbon nanodots to the acid electrolyte acts as a hydrophilizer, changes the size of the porous surface: as a result, it is possible to control the porosity of the films. Calcination of anodic aluminum oxide-membrane at 500 degree Celsius lead to expansion and thinning of pore walls. Anodic aluminum oxide-membrane was tested for dialysis process for milk whey separation. The membrane obtained in electrolyte: “oxalic acid-matter with carbon nanodots” showed a greater degree of rejection of protein particles in comparison with a similar membrane obtained in electrolyte of oxalic acid. The advantage of using carbon nanodots in acid electrolyte is the simplicity and environmental friendliness of the synthesis. The approach, which involves the addition of a colloidal system with carbon nanomaterial, allows one to avoid using a strongly acidic electrolyte for obtaining membranes with smaller pores. One of the ways for using of anodic oxide aluminum-membrane is the dialysis of biological fluids, for example, milk whey.
{"title":"Anodic aluminum oxide-membrane prepared in electrolyte “oxalic acid – matter with carbon nanodots”","authors":"K. Kudelko, L. Rozhdestvenska, L. Ponomarova, V. M. Оgenko","doi":"10.15407/hftp14.02.237","DOIUrl":"https://doi.org/10.15407/hftp14.02.237","url":null,"abstract":"Anodic porous alumina has been studied and used as nanoscale structure, coating, template in different applications. The porous anodic alumina oxide could be described as numerous hexagonal cells and looks like cellular structure. In this work we report about results of study anodizing of aluminum with usage of electrolyte: “oxalic acid electrolyte-matter with carbon nanodots”. It was received anodic aluminum oxide-membrane with aluminum supporting; calcination was used as post treatment. The aluminum substrate allows one to fix the membrane in the cells. Methods: processes of anodizing was provided in 0.3M oxalic acid with addition of colloid system of carbon nanodots, temperature of process was controlled at range of 10 degree Celsius, aluminum foil (anode) and platinum plate (cathode) were used; thickness of aluminum foil was 0.1 µm; morphology and structure of anodic aluminum oxide-membrane were determined with usage of electron scanning microscope; the contact angle between the surface of anodic aluminum oxide-membrane and deionized water was measured with “drop” methodology. Calcium content was monitored with a conductometer. The content of proteins was determined with photometry (micro Lowry’s method). It was found that contact angle of the surface of anodic aluminum oxide-membrane obtained in electrolyte “oxalic acid-matter with carbon nanodots” and deionized water is 38 degrees. Adding colloidal system of carbon nanodots to the acid electrolyte acts as a hydrophilizer, changes the size of the porous surface: as a result, it is possible to control the porosity of the films. Calcination of anodic aluminum oxide-membrane at 500 degree Celsius lead to expansion and thinning of pore walls. Anodic aluminum oxide-membrane was tested for dialysis process for milk whey separation. The membrane obtained in electrolyte: “oxalic acid-matter with carbon nanodots” showed a greater degree of rejection of protein particles in comparison with a similar membrane obtained in electrolyte of oxalic acid. The advantage of using carbon nanodots in acid electrolyte is the simplicity and environmental friendliness of the synthesis. The approach, which involves the addition of a colloidal system with carbon nanomaterial, allows one to avoid using a strongly acidic electrolyte for obtaining membranes with smaller pores. One of the ways for using of anodic oxide aluminum-membrane is the dialysis of biological fluids, for example, milk whey.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132677811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Matysina, A. Zolotarenko, O. Zolotarenko, T. Myronenko, D. V. Schur, E. Rudakova, M. Chymbai, A. Zolotarenko, I. Zagorulko, O. Havryliuk
As part of the work, the hexagonal structure of B19 type metals as hydrogen sorbents will be considered. That is, crystal lattices are considered, where atoms of impurities (hydrogen) are introduced into the interstices of the metal. To do this, we present an image of the B19 structure itself. In this work, the solubility of hydrogen in the crystal structure of B19 type metals was studied using the configuration method, and the dependence on the composition of the alloy and temperature was found in the substitution of nodes and interstices. Also, in the work the degrees of long-range order at the nodes are considered and the parameters of the correlation in the substitution are determined. A graphical view of the effect of atomic order on the solubility of impurities is given. The calculated data obtained in the work coincide with the experimental data of other studies, and the obtained calculation formulas make it possible to determine the energy parameters of the alloys, which is a certain scientific value of the work. The proposed system takes into account only atomic interaction and absorption (dissolution) and diffusion of interstitial atoms into the bulk of the crystal structure; therefore, it is possible to predict the introduction of only a hydrogen atom. Thus, the results obtained in the work of the correlation parameters for the distribution of atoms only in octapores or only in tetrapores allow a deeper study of the physical characteristics of alloys of the B19 type and an understanding of the processes of hydrogen sorption by the working bodies of hydrogen storage.
{"title":"Embedded atoms in a crystalline hexagonal structure","authors":"Z. Matysina, A. Zolotarenko, O. Zolotarenko, T. Myronenko, D. V. Schur, E. Rudakova, M. Chymbai, A. Zolotarenko, I. Zagorulko, O. Havryliuk","doi":"10.15407/hftp14.02.210","DOIUrl":"https://doi.org/10.15407/hftp14.02.210","url":null,"abstract":"As part of the work, the hexagonal structure of B19 type metals as hydrogen sorbents will be considered. That is, crystal lattices are considered, where atoms of impurities (hydrogen) are introduced into the interstices of the metal. To do this, we present an image of the B19 structure itself. In this work, the solubility of hydrogen in the crystal structure of B19 type metals was studied using the configuration method, and the dependence on the composition of the alloy and temperature was found in the substitution of nodes and interstices. Also, in the work the degrees of long-range order at the nodes are considered and the parameters of the correlation in the substitution are determined. A graphical view of the effect of atomic order on the solubility of impurities is given. The calculated data obtained in the work coincide with the experimental data of other studies, and the obtained calculation formulas make it possible to determine the energy parameters of the alloys, which is a certain scientific value of the work. The proposed system takes into account only atomic interaction and absorption (dissolution) and diffusion of interstitial atoms into the bulk of the crystal structure; therefore, it is possible to predict the introduction of only a hydrogen atom. Thus, the results obtained in the work of the correlation parameters for the distribution of atoms only in octapores or only in tetrapores allow a deeper study of the physical characteristics of alloys of the B19 type and an understanding of the processes of hydrogen sorption by the working bodies of hydrogen storage.","PeriodicalId":296392,"journal":{"name":"Himia, Fizika ta Tehnologia Poverhni","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129322639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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