Nanotechnology is arising as a fast-developing research discipline with many usages areas. The silver nanoparticles synthesis (sm-AgNPs) is accomplished by reduction of silver ions in treatment with aqueous extract of Sideritis montana L. leaves. The colour change from yellow to dark brown confirmed the structures. The spectroscopic studies revealed the desired structure. In the UV-Vis spectrum, the maximum absorption was observed at 480 nm. The diffraction peaks (2θ) at the degrees of 38.14°, 44.29°, 64.48°, and 77.38° can correspond to 111, 200, 220, and 311 facets that indicates the nanostructure to be a face-centered cubic unit structure. The scanning electron microscope (SEM) and dynamic light scattering (DLS) analyses indicated that the synthesized nanoparticles were spherical with an average particle size of 36.42 nm. The zeta potential of sm-AgNPs was found as -35.2 mV which indicated the repulsion among nanoparticles and their stability. The peaks from Fourier transform infrared spectrometer (FTIR) were associated with the phenols, flavonoids, terpenoids, and alkaloids, indicating that the corresponding compounds might act as reducing agents. The photocatalytic effect of sm-AgNPs was examined by degradation of methylene blue and sm-AgNPs were able to degrade the dye by about 67% at 96 h.
{"title":"Synthesis of Silver Nanoparticles Using Sideritis montana L. Leaf Extract: Characterization, Catalytic Degradation of Methylene Blue and Antioxidant Activity","authors":"R. Erenler, E. Gecer","doi":"10.4028/p-333bjm","DOIUrl":"https://doi.org/10.4028/p-333bjm","url":null,"abstract":"Nanotechnology is arising as a fast-developing research discipline with many usages areas. The silver nanoparticles synthesis (sm-AgNPs) is accomplished by reduction of silver ions in treatment with aqueous extract of Sideritis montana L. leaves. The colour change from yellow to dark brown confirmed the structures. The spectroscopic studies revealed the desired structure. In the UV-Vis spectrum, the maximum absorption was observed at 480 nm. The diffraction peaks (2θ) at the degrees of 38.14°, 44.29°, 64.48°, and 77.38° can correspond to 111, 200, 220, and 311 facets that indicates the nanostructure to be a face-centered cubic unit structure. The scanning electron microscope (SEM) and dynamic light scattering (DLS) analyses indicated that the synthesized nanoparticles were spherical with an average particle size of 36.42 nm. The zeta potential of sm-AgNPs was found as -35.2 mV which indicated the repulsion among nanoparticles and their stability. The peaks from Fourier transform infrared spectrometer (FTIR) were associated with the phenols, flavonoids, terpenoids, and alkaloids, indicating that the corresponding compounds might act as reducing agents. The photocatalytic effect of sm-AgNPs was examined by degradation of methylene blue and sm-AgNPs were able to degrade the dye by about 67% at 96 h.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"51 1","pages":"17 - 28"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86184593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shaojun Wu, Su Na Cha, Yasir Abbas, Zhilei Zhao, H. Hou, X. Xue
In this study, carbon nanotube films, densifying with ethanol/water, acetone/water, acetic acid/water, sulfuric acid/water with volume rate of 4:1 and following rolling process, were manufactured. Afterwards, the electrothermal, mechanical properties and performance stability of these carbon nanotube films were investigated, along with mechanism analysis. Based on our investigations, the ability of rapid electrothermal response within 5 second, higher steady-state temperature of above 120~160°C at low input voltages of 5V, excellent cycling stability of electrical heating are reported by the aforementioned methods, revealing better outcome as compared with previous reports of congeneric carbon nanotube films. The electrothermal and mechanical properties of treated carbon nanotube films were superior to carbon nanotube film pressed from carbon nanotube aerosol, and the best outcomes could be synchronously achieved at an immersion of 0.5h in solvents and rolling. The consequences, which are attributable to treatments by the first three mixed solvents as well as rolling, were similar, however, the electrical and electrothermal properties of carbon nanotube film treated with sulfuric acid/water and rolling were significantly improved comparative to others due to p-type doping and purification, which could enhance the electrical conductivity of carbon nanotube film, while the mechanical property was not degraded compared to films treated by other ways. Particularly, electrical and mechanical properties of carbon nanotube films were unchanged through repeated electrical heating owing to the stability of their structure and morphology, which contributed to exceedingly stable electrothermal property and established foundation for application as heater with long-term stability. Lastly, we have also proposed the mechanism concerning performance stability of electrical heating film.
{"title":"Remarkable Electrothermal Behaviors and Performance Stability of Carbon Nanotube Films Densifying with Various Methods","authors":"Shaojun Wu, Su Na Cha, Yasir Abbas, Zhilei Zhao, H. Hou, X. Xue","doi":"10.4028/p-s33q1n","DOIUrl":"https://doi.org/10.4028/p-s33q1n","url":null,"abstract":"In this study, carbon nanotube films, densifying with ethanol/water, acetone/water, acetic acid/water, sulfuric acid/water with volume rate of 4:1 and following rolling process, were manufactured. Afterwards, the electrothermal, mechanical properties and performance stability of these carbon nanotube films were investigated, along with mechanism analysis. Based on our investigations, the ability of rapid electrothermal response within 5 second, higher steady-state temperature of above 120~160°C at low input voltages of 5V, excellent cycling stability of electrical heating are reported by the aforementioned methods, revealing better outcome as compared with previous reports of congeneric carbon nanotube films. The electrothermal and mechanical properties of treated carbon nanotube films were superior to carbon nanotube film pressed from carbon nanotube aerosol, and the best outcomes could be synchronously achieved at an immersion of 0.5h in solvents and rolling. The consequences, which are attributable to treatments by the first three mixed solvents as well as rolling, were similar, however, the electrical and electrothermal properties of carbon nanotube film treated with sulfuric acid/water and rolling were significantly improved comparative to others due to p-type doping and purification, which could enhance the electrical conductivity of carbon nanotube film, while the mechanical property was not degraded compared to films treated by other ways. Particularly, electrical and mechanical properties of carbon nanotube films were unchanged through repeated electrical heating owing to the stability of their structure and morphology, which contributed to exceedingly stable electrothermal property and established foundation for application as heater with long-term stability. Lastly, we have also proposed the mechanism concerning performance stability of electrical heating film.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"25 1","pages":"121 - 138"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79823187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sumaira Mumtaz, R. Nadeem, R. A. Sarfraz, M. Shahid
Drug resistant microbial strains are becoming continuous dilemma for researchers; hence, some alternates are required to combat this issue. In this way, nanotechnology is fascinating researchers to put forward a step in order to synthesize metals nanoparticles via adopting an ecofriendly, facile, and quick approach using medicinal plants. By means of aqueous extract of Polyalthia longifolia (AEPl), gold nanoparticles (AuPl) were synthesized for the mechanism study of synthesis and antibacterial bahavior. The reddish colored solution was an indicative clue of synthesis showing surface plasmon band at 540nm using UV/Visble spectroscopy. Various functional groups in the extract were identified which participated in the reduction of metal ions to metallic form as indicated from the Fourier Transform Infrared (FTIR) spectra of AuPl. Moving ahead, the synthesized AuPl were characterized through Transmission Electron Microscopy (TEM) showed spherical shape with more or less 50nm size. Besides, Scanning Electron Microscopy (SEM) study revealed some aggregates formation. Further, structural characterization via X-Rays Diffractometry (XRD) displayed crystallline nature of these nanoparticles. Finally, Energy Dispersive X-rays (EDX) analysis described their metallic form. The antibacterial activity at increased concentration when measured; AuPl showed 15 and 18mm bacterial growth inhibition zones against Escherichia coli and Bacillus subtilis at 100μg/mL concentration respectively. In addition, significant least minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of AuPl against these microbes were also observed. In the light of the above knowledge, it is inferred that the biogenic AuPl exhibit strong antibacterial potential enabling them to be a good substitute of antibiotics.
{"title":"Mechanism Study of Green Synthesis and Antibacterial Attribute of Polyalthia longifolia Based Gold Nanoparticles","authors":"Sumaira Mumtaz, R. Nadeem, R. A. Sarfraz, M. Shahid","doi":"10.4028/p-k39913","DOIUrl":"https://doi.org/10.4028/p-k39913","url":null,"abstract":"Drug resistant microbial strains are becoming continuous dilemma for researchers; hence, some alternates are required to combat this issue. In this way, nanotechnology is fascinating researchers to put forward a step in order to synthesize metals nanoparticles via adopting an ecofriendly, facile, and quick approach using medicinal plants. By means of aqueous extract of Polyalthia longifolia (AEPl), gold nanoparticles (AuPl) were synthesized for the mechanism study of synthesis and antibacterial bahavior. The reddish colored solution was an indicative clue of synthesis showing surface plasmon band at 540nm using UV/Visble spectroscopy. Various functional groups in the extract were identified which participated in the reduction of metal ions to metallic form as indicated from the Fourier Transform Infrared (FTIR) spectra of AuPl. Moving ahead, the synthesized AuPl were characterized through Transmission Electron Microscopy (TEM) showed spherical shape with more or less 50nm size. Besides, Scanning Electron Microscopy (SEM) study revealed some aggregates formation. Further, structural characterization via X-Rays Diffractometry (XRD) displayed crystallline nature of these nanoparticles. Finally, Energy Dispersive X-rays (EDX) analysis described their metallic form. The antibacterial activity at increased concentration when measured; AuPl showed 15 and 18mm bacterial growth inhibition zones against Escherichia coli and Bacillus subtilis at 100μg/mL concentration respectively. In addition, significant least minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of AuPl against these microbes were also observed. In the light of the above knowledge, it is inferred that the biogenic AuPl exhibit strong antibacterial potential enabling them to be a good substitute of antibiotics.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"19 1","pages":"1 - 16"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74514208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The anatase titanium dioxide nanotube array (TiO2 NTA) with short and independent nanotube film structure is applied as stable metal oxide electrode substrate. The influence of different proton acid electrolytes is fully investigated on the electrical double-layer capacitance. The anatase TiO2 NTA electrode substrate conducts reversible protonation-deprotonation process of dissociation hydrogen ion and electrostatic adsorption-desorption process of equilibrium anion in the cycling charge-discharge process. The reversible properties could be well proved by highly symmetric characteristic of positive-negative sweeping current and charge-discharge potential. The protonated TiO2 NTA electrode substrate reveals cyclic voltammetry-based capacitances of 0.147 and 0.124 mF cm-2, galvanostatic charge-discharge-based capacitances of 0.167 and 0.148 mF cm-2 when similar dissociation proton concentration is maintained in 1.0 M H2SO4 and 1.0 M HCl. The TiO2/H2SO4 exhibits similar capacitance enhancement ratio of 1.19 and 1.13 in comparison with of the TiO2/HCl. The corresponding electrical double-layer capacitance at the same dissociation proton condition is mostly dependent on the electrostatic interaction between the protonated TiO2 and equilibrium anions in different proton acid electrolytes rather than anion diffusion. The theoretical simulation calculation reveals that TiOOH+-HSO4- shows lower interaction interface energy and higher total densities of states than TiOOH+-Cl-. Accordingly, TiO2/H2SO4 conducts more feasible protonation and electrostatic adsorption process rather than TiO2/HCl, contributing to its superior electrical double-layer capacitance.
采用具有短而独立的纳米管膜结构的锐钛矿型二氧化钛纳米管阵列(TiO2 NTA)作为稳定的金属氧化物电极衬底。研究了不同质子酸电解质对双电层电容的影响。锐钛矿型TiO2 NTA电极衬底在循环充放电过程中进行解离氢离子的可逆质子化-去质子化过程和平衡阴离子的静电吸附-脱附过程。正负横扫电流和充放电电位的高度对称特性可以很好地证明其可逆性。质子化的TiO2 NTA电极衬底在1.0 M H2SO4和1.0 M HCl中保持相似的解离质子浓度时，循环伏安电容分别为0.147和0.124 mF cm-2，恒流充放电电容分别为0.167和0.148 mF cm-2。TiO2/H2SO4的电容增强比与TiO2/HCl相似，分别为1.19和1.13。在相同质子解离条件下，相应的双电层电容主要取决于不同质子酸电解质中质子化TiO2与平衡阴离子之间的静电相互作用，而不是阴离子的扩散。理论模拟计算表明，TiOOH+- hso4 -比TiOOH+- cl -具有更低的相互作用界面能和更高的态总密度。因此，TiO2/H2SO4比TiO2/HCl进行更可行的质子化和静电吸附过程，从而使其具有优越的双层电容量。
{"title":"Electrolyte-Dependent Capacitance of Titanium Dioxide Nanotube Array Electrode Substrate","authors":"F. Wu, C. Yao, Yi-bing Xie","doi":"10.4028/p-72934g","DOIUrl":"https://doi.org/10.4028/p-72934g","url":null,"abstract":"The anatase titanium dioxide nanotube array (TiO2 NTA) with short and independent nanotube film structure is applied as stable metal oxide electrode substrate. The influence of different proton acid electrolytes is fully investigated on the electrical double-layer capacitance. The anatase TiO2 NTA electrode substrate conducts reversible protonation-deprotonation process of dissociation hydrogen ion and electrostatic adsorption-desorption process of equilibrium anion in the cycling charge-discharge process. The reversible properties could be well proved by highly symmetric characteristic of positive-negative sweeping current and charge-discharge potential. The protonated TiO2 NTA electrode substrate reveals cyclic voltammetry-based capacitances of 0.147 and 0.124 mF cm-2, galvanostatic charge-discharge-based capacitances of 0.167 and 0.148 mF cm-2 when similar dissociation proton concentration is maintained in 1.0 M H2SO4 and 1.0 M HCl. The TiO2/H2SO4 exhibits similar capacitance enhancement ratio of 1.19 and 1.13 in comparison with of the TiO2/HCl. The corresponding electrical double-layer capacitance at the same dissociation proton condition is mostly dependent on the electrostatic interaction between the protonated TiO2 and equilibrium anions in different proton acid electrolytes rather than anion diffusion. The theoretical simulation calculation reveals that TiOOH+-HSO4- shows lower interaction interface energy and higher total densities of states than TiOOH+-Cl-. Accordingly, TiO2/H2SO4 conducts more feasible protonation and electrostatic adsorption process rather than TiO2/HCl, contributing to its superior electrical double-layer capacitance.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"29 1","pages":"71 - 80"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81000138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Wu, Ri Liang Wu, Chuang Qi Zang, Chang Yuan Yu, Y. Liu
The Cu2+ in the drinking water has a very serious impact on human health and social ecology. Many countries have the policy on the Cu2+ concentration limitation in drinking water and the industrial Cu2+ emission standards for the treated wastewater. Scientists have developed many methods to remove Cu2+ from wastewater. Among all the adsorption method is widely used due to its high efficacy, feasibility and low cost. The adsorbent is critical to achieving superior Cu2+ removal result. In this paper, Fe3O4/carbon-graphene oxide nanocomposites (Fe3O4@C-GO) were prepared by a hydrothermal method. The Fe3O4@C-GO is the main absorbent to Cu2+ through chemisorption. The specific surface area of Fe3O4@C-GO dramatically increases from 16 m2/g of Fe3O4@C to 62 m2/g, which expands the Cu2+ absorption capacity up to 350 mg/g. Fe3O4 nanoparticles with about 12 nm in diameter are uniformly encapsulated in the C-GO matrix, and therefore the Fe3O4@C-GO can be easily separated from the solution via magnetics. This adsorbent is also very easily recovered by an external magnetic field from the treated wastewater and has high reusability.
{"title":"Application of Fe3O4@Carbon/Graphene Oxide Nanocomposites for Cu(II) Removal from Wastewater","authors":"M. Wu, Ri Liang Wu, Chuang Qi Zang, Chang Yuan Yu, Y. Liu","doi":"10.4028/p-309506","DOIUrl":"https://doi.org/10.4028/p-309506","url":null,"abstract":"The Cu2+ in the drinking water has a very serious impact on human health and social ecology. Many countries have the policy on the Cu2+ concentration limitation in drinking water and the industrial Cu2+ emission standards for the treated wastewater. Scientists have developed many methods to remove Cu2+ from wastewater. Among all the adsorption method is widely used due to its high efficacy, feasibility and low cost. The adsorbent is critical to achieving superior Cu2+ removal result. In this paper, Fe3O4/carbon-graphene oxide nanocomposites (Fe3O4@C-GO) were prepared by a hydrothermal method. The Fe3O4@C-GO is the main absorbent to Cu2+ through chemisorption. The specific surface area of Fe3O4@C-GO dramatically increases from 16 m2/g of Fe3O4@C to 62 m2/g, which expands the Cu2+ absorption capacity up to 350 mg/g. Fe3O4 nanoparticles with about 12 nm in diameter are uniformly encapsulated in the C-GO matrix, and therefore the Fe3O4@C-GO can be easily separated from the solution via magnetics. This adsorbent is also very easily recovered by an external magnetic field from the treated wastewater and has high reusability.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"11 1","pages":"41 - 58"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82821199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fariz Abdul Rahman, W. Basirun, M. Johan, N. Ghazali, M. Ladan
This study employed the template-free chemical oxidative polymerisation method to synthesise polyaniline (PANI) and polyaniline/tin-doped titania (PANI/Sn-doped TiO2) nanocomposite as corrosion inhibitors. FTIR and XRD were employed to characterise the chemical composition of the prepared samples. TEM and FESEM microscopy validated the presence of the PANI and that the Sn-doped TiO2 nanoparticle were successfully incorporated into PANI to form the nanocomposite. The synthesised materials were mixed in the polyvinyl butyral (PVB) binder, coated onto mild steel substrates, and exposed to 3.5 wt.% NaCl solution for 30 days. Altogether, three coating systems were tested, i.e., pure PVB, PVB + PANI, and PVB + PANI/Sn-doped TiO2. The corrosion parameters were measured via EIS and Tafel polarisation techniques. Overall, the PANI/Sn-doped TiO2 nanocomposite as a corrosion inhibitor effectively inhibited the corrosion of the mild steel, and its corrosion rate was 3.484 x 10-7 mm/year.
{"title":"Corrosion Protection of Mild Steel by Polyaniline/Tin-Doped Titania Nanocomposite","authors":"Fariz Abdul Rahman, W. Basirun, M. Johan, N. Ghazali, M. Ladan","doi":"10.4028/p-0c9315","DOIUrl":"https://doi.org/10.4028/p-0c9315","url":null,"abstract":"This study employed the template-free chemical oxidative polymerisation method to synthesise polyaniline (PANI) and polyaniline/tin-doped titania (PANI/Sn-doped TiO2) nanocomposite as corrosion inhibitors. FTIR and XRD were employed to characterise the chemical composition of the prepared samples. TEM and FESEM microscopy validated the presence of the PANI and that the Sn-doped TiO2 nanoparticle were successfully incorporated into PANI to form the nanocomposite. The synthesised materials were mixed in the polyvinyl butyral (PVB) binder, coated onto mild steel substrates, and exposed to 3.5 wt.% NaCl solution for 30 days. Altogether, three coating systems were tested, i.e., pure PVB, PVB + PANI, and PVB + PANI/Sn-doped TiO2. The corrosion parameters were measured via EIS and Tafel polarisation techniques. Overall, the PANI/Sn-doped TiO2 nanocomposite as a corrosion inhibitor effectively inhibited the corrosion of the mild steel, and its corrosion rate was 3.484 x 10-7 mm/year.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"18 1","pages":"81 - 97"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80369575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The electrochemical synthesis of poly (o-aminobenzyl alcohol) (PABA) coatings containing three different amounts of NiZnFe4O4 nanoparticle (NP) with and without 0.25 mM Schiff base (ORG) on stainless steel (SS) was carried out in 0.15 M LiClO4 containing acetonitrile (ACN) solution. The synthesis curves of PABA-NP and PABA-ORG-NP films exhibited the different current and monomer oxidation potential values indicating the presence of NP and ORG compounds. Besides, the addition of ORG to the NP-containing synthesis solution resulted in an increase in the electropolymerization rate of the PABA film compared to the NP-containing medium alone. Indeed, SEM images of PABA-NP and PABA-ORG-NP also showed that their morphological structures were different. As a result of the evaluation of the impedance analysis, it was seen that PABA-NP and PABA-ORG-NP films provided significant physical barrier behavior to the SS electrode, in 3.5% NaCl solution. PABA-NP25 and PABA-ORG-NP25 coatings exhibited more protection behavior against to the move of corrosive substances to SS. The presence of both NP and ORG in the polymer coating further improved the superior protection property of the PABA film, in a longer time.
{"title":"Nanoparticle and Schiff Base Compound in Poly(O-Aminobenzyl Alcohol) Coating for Protection of 316L Stainless Steel against Corrosion","authors":"A. Ozyilmaz, Cumali Çelik, Begüm Ozgen","doi":"10.4028/p-xe202d","DOIUrl":"https://doi.org/10.4028/p-xe202d","url":null,"abstract":"The electrochemical synthesis of poly (o-aminobenzyl alcohol) (PABA) coatings containing three different amounts of NiZnFe4O4 nanoparticle (NP) with and without 0.25 mM Schiff base (ORG) on stainless steel (SS) was carried out in 0.15 M LiClO4 containing acetonitrile (ACN) solution. The synthesis curves of PABA-NP and PABA-ORG-NP films exhibited the different current and monomer oxidation potential values indicating the presence of NP and ORG compounds. Besides, the addition of ORG to the NP-containing synthesis solution resulted in an increase in the electropolymerization rate of the PABA film compared to the NP-containing medium alone. Indeed, SEM images of PABA-NP and PABA-ORG-NP also showed that their morphological structures were different. As a result of the evaluation of the impedance analysis, it was seen that PABA-NP and PABA-ORG-NP films provided significant physical barrier behavior to the SS electrode, in 3.5% NaCl solution. PABA-NP25 and PABA-ORG-NP25 coatings exhibited more protection behavior against to the move of corrosive substances to SS. The presence of both NP and ORG in the polymer coating further improved the superior protection property of the PABA film, in a longer time.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"91 1","pages":"99 - 119"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86196820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AbstractTitanium dioxide nanoparticles are great boosters for better sunlight absorption by plants. However, their band gap is so wide that they can only absorb UV light, which is a small portion of the sunlight. To improve the absorption of visible light, in this work, titanium nanoparticles were sensitized by saffron dye and the effect of foliar application of the dyed nanoparticles on growth parameters and enzymatic properties of sorghum was investigated and the results were compared with those of conventional titanium dioxide nanoparticles. The experiment was conducted in Zabol region, Iran. Saffron, a natural organic dye, was used as a sensitizer because of its availability and high extinction coefficient in the visible regions. To perform sensitization, titanium dioxide nanoparticles were immersed in saffron dye solution to absorb the dye on their surface. Then different concentrations of the sensitized nanoparticles were applied on plants by foliar spraying. The most improved growth parameters including root and shoot lengths, shoot fresh and dry weights, root fresh and dry weights were obtained after application of dye-sensitized TiO2 nanoparticles. Zinc and iron are the elements highly affected by the application of new nanoparticles. Enzyme activities of catalase, ascorbate peroxidase and guaiacol peroxidase were also increased significantly. Chlorophyll a and Chlorophyll a/b ratio showed the highest values in 500 ppm dye-sensitized TiO2 nanoparticles. The obtained results confirm the improvement in growth parameters and enzymatic properties of Sorghum after application of the new TiO2 nanoparticles.
{"title":"Effect of TiO2 Nanoparticles with High Light Absorption on Improving Growth Parameters and Enzymatic Properties of Sorghum (Sorghum bicolor L. Moench)","authors":"M. Hassan, A. Ahangar, N. Mir","doi":"10.4028/p-dorek7","DOIUrl":"https://doi.org/10.4028/p-dorek7","url":null,"abstract":"AbstractTitanium dioxide nanoparticles are great boosters for better sunlight absorption by plants. However, their band gap is so wide that they can only absorb UV light, which is a small portion of the sunlight. To improve the absorption of visible light, in this work, titanium nanoparticles were sensitized by saffron dye and the effect of foliar application of the dyed nanoparticles on growth parameters and enzymatic properties of sorghum was investigated and the results were compared with those of conventional titanium dioxide nanoparticles. The experiment was conducted in Zabol region, Iran. Saffron, a natural organic dye, was used as a sensitizer because of its availability and high extinction coefficient in the visible regions. To perform sensitization, titanium dioxide nanoparticles were immersed in saffron dye solution to absorb the dye on their surface. Then different concentrations of the sensitized nanoparticles were applied on plants by foliar spraying. The most improved growth parameters including root and shoot lengths, shoot fresh and dry weights, root fresh and dry weights were obtained after application of dye-sensitized TiO2 nanoparticles. Zinc and iron are the elements highly affected by the application of new nanoparticles. Enzyme activities of catalase, ascorbate peroxidase and guaiacol peroxidase were also increased significantly. Chlorophyll a and Chlorophyll a/b ratio showed the highest values in 500 ppm dye-sensitized TiO2 nanoparticles. The obtained results confirm the improvement in growth parameters and enzymatic properties of Sorghum after application of the new TiO2 nanoparticles.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"146 1","pages":"29 - 40"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86087295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A well-controlled multistage hydrothermal technique was developed to synthesise hierarchical zinc oxide (ZnO) nanomaterials with a high surface-to-volume ratio. Hierarchical ZnO nanomaterials, hierarchical nanowires (HNWs) and hierarchical nanodiscs (HNDs), assembled from initial mono-morphological nanomaterials, ZnO nanowires, and ZnO nanodiscs respectively were prepared by sequential nucleation and growth following a hydrothermal course. The hierarchical nanomaterials composed of one-dimensional nanowire building blocks were obtained by introducing zinc nitrate as a source of zinc ions during the second growth phase. In comparison to their initial monomorphological counterparts, the prepared HNWs and HNDs showed superior photocatalytic performances. The improvement in the photocatalytic performance was ascribed to the reduction in dimensionality, the ultrahigh surface-to-volume ratio, the expanded proportion of the exposed polar area, and the creation of nanojunctions between the secondary nanowires and initial ZnO nanowires or nanodiscs. This work paves the way for the low-cost, large-scale, and low-temperature production of ZnO nanomaterials with superior photocatalytic properties.
{"title":"Hierarchical ZnO Nanomaterials with Superior Photocatalytic Properties","authors":"M. Alenezi, A. Almeshal, A. Alkhaledi","doi":"10.4028/p-652gfh","DOIUrl":"https://doi.org/10.4028/p-652gfh","url":null,"abstract":"A well-controlled multistage hydrothermal technique was developed to synthesise hierarchical zinc oxide (ZnO) nanomaterials with a high surface-to-volume ratio. Hierarchical ZnO nanomaterials, hierarchical nanowires (HNWs) and hierarchical nanodiscs (HNDs), assembled from initial mono-morphological nanomaterials, ZnO nanowires, and ZnO nanodiscs respectively were prepared by sequential nucleation and growth following a hydrothermal course. The hierarchical nanomaterials composed of one-dimensional nanowire building blocks were obtained by introducing zinc nitrate as a source of zinc ions during the second growth phase. In comparison to their initial monomorphological counterparts, the prepared HNWs and HNDs showed superior photocatalytic performances. The improvement in the photocatalytic performance was ascribed to the reduction in dimensionality, the ultrahigh surface-to-volume ratio, the expanded proportion of the exposed polar area, and the creation of nanojunctions between the secondary nanowires and initial ZnO nanowires or nanodiscs. This work paves the way for the low-cost, large-scale, and low-temperature production of ZnO nanomaterials with superior photocatalytic properties.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"31 1","pages":"59 - 70"},"PeriodicalIF":1.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73828432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
According to the motion style, a nanomotor can be classified into linear nanomotor and rotary nanomotor. Nanomotors, as the core components of nanomachine, have broad research prospects and applications. Here, a molecular dynamics method is used to simulate the linear nanomotor on a stretched carbon nanotube substrate. The results show that the nanomotor speed is well controlled by the temperature gradient, the axial strain of the substrate and the nanomotor size. When the nanomotor moves stably on the substrate carbon nanotube with a temperature difference of 200 K at both ends, the time required for the nanomotor to travel the same distance on the substrate carbon nanotube with 15% strain is about 62% longer than that without strain. The mechanism for the nanomotor movement and speed control is attributed to the thermophoretic force acting on the nanomotor. Specifically, the thermophoretic force increases with increasing substrate temperature gradient and decreases with increasing substrate strain. These results provide a novel method for controlling the speed of a nanomotor and inform nanomotor design and manufacture, as well as presenting a deeper understanding of the mechanism and movement law of the nanomotor.
{"title":"Controlled Mass Transportation on Nanotubes by Strain and Thermal Gradient: A Molecular Dynamics Study","authors":"R. Zhang, Song Yuan Li, Y. Li, Mei Fen Wang","doi":"10.4028/p-wj60p1","DOIUrl":"https://doi.org/10.4028/p-wj60p1","url":null,"abstract":"According to the motion style, a nanomotor can be classified into linear nanomotor and rotary nanomotor. Nanomotors, as the core components of nanomachine, have broad research prospects and applications. Here, a molecular dynamics method is used to simulate the linear nanomotor on a stretched carbon nanotube substrate. The results show that the nanomotor speed is well controlled by the temperature gradient, the axial strain of the substrate and the nanomotor size. When the nanomotor moves stably on the substrate carbon nanotube with a temperature difference of 200 K at both ends, the time required for the nanomotor to travel the same distance on the substrate carbon nanotube with 15% strain is about 62% longer than that without strain. The mechanism for the nanomotor movement and speed control is attributed to the thermophoretic force acting on the nanomotor. Specifically, the thermophoretic force increases with increasing substrate temperature gradient and decreases with increasing substrate strain. These results provide a novel method for controlling the speed of a nanomotor and inform nanomotor design and manufacture, as well as presenting a deeper understanding of the mechanism and movement law of the nanomotor.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"51 1","pages":"97 - 107"},"PeriodicalIF":1.7,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76505028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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