Pub Date : 2023-07-20DOI: 10.15251/djnb.2023.183.805
M. A. Bello, R. Azis, M. K. Shabdin, N. Osman, A. Yakubu
This study explored the microwave attenuation and shielding properties of PTFE/Fe2O3/OPEFB composites in the X-band frequency range. Fe2O3 nanoparticles were incorporated into the PTFE/OPEFB matrix using a powder-dry mixing technique. The composites were characterized using XRD and FESEM, and attenuation performance was evaluated using a VNA. The results indicated that the addition of Fe2O3 nanoparticles improved microwave attenuation and shielding properties, with the composite containing 15 wt% Fe2O3 exhibiting the highest attenuation of 16.02 dB. The homogeneous dispersion of Fe2O3 nanoparticles was confirmed through FESEM analysis, and XRD analysis confirmed the presence of Fe2O3 nanoparticles in the composites. The study concludes that PTFE/ Fe2O3/OPEFB composites have potential for electromagnetic interference shielding applications in aerospace, telecommunications, and electronics industries.
{"title":"Investigation of microwave attenuation and shielding performance of PTFE/Fe2O3/OPEFB composites at X-band frequency","authors":"M. A. Bello, R. Azis, M. K. Shabdin, N. Osman, A. Yakubu","doi":"10.15251/djnb.2023.183.805","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.805","url":null,"abstract":"This study explored the microwave attenuation and shielding properties of PTFE/Fe2O3/OPEFB composites in the X-band frequency range. Fe2O3 nanoparticles were incorporated into the PTFE/OPEFB matrix using a powder-dry mixing technique. The composites were characterized using XRD and FESEM, and attenuation performance was evaluated using a VNA. The results indicated that the addition of Fe2O3 nanoparticles improved microwave attenuation and shielding properties, with the composite containing 15 wt% Fe2O3 exhibiting the highest attenuation of 16.02 dB. The homogeneous dispersion of Fe2O3 nanoparticles was confirmed through FESEM analysis, and XRD analysis confirmed the presence of Fe2O3 nanoparticles in the composites. The study concludes that PTFE/ Fe2O3/OPEFB composites have potential for electromagnetic interference shielding applications in aerospace, telecommunications, and electronics industries.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44019337","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}
Pub Date : 2023-07-20DOI: 10.15251/djnb.2023.183.813
H. W. Zhao, Yang Li, R. Zhao, Z. Li
(K0.48Na0.52)NbO3-0.03Bi0.5Na0.5ZrO3 (KNNS-0.03BNZ) ceramics were prepared doped with 3 mol% Bi0.5Na0.5ZrO3 (BNZ), and the effect of sintering temperature on dielectric and piezoelectric properties of KNNS-0.03BNZ was also investigated. KNNS-0.03BNZ ceramics at all sintering temperatures exhibit a single perovskite structure, and the change of sintering temperature has no significant effect on the phase composition of KNNS 0.03BNZ ceramics. The Raman shifts of the ν1 and ν5 vibration modes have irregular changes in all sintering temperature ranges, indicating that there are polycrystalline phases coexisting in this region. With the change of sintering temperature, Tc slightly shifts to the high temperature direction, and TR-T slightly shifts to the high temperature direction, dielectric constant εr continuously increases, while dielectric loss tanδ firstly decreasing and then increasing. Thanks to the presence of a small amount of liquid phase in the ceramics sintered at 1160 ℃, piezoelectric coefficient d33 reaches 280 pC/N.
{"title":"Effect of sintering temperature on the structure and electrical properties of KNNS-0.03BNZ ceramics","authors":"H. W. Zhao, Yang Li, R. Zhao, Z. Li","doi":"10.15251/djnb.2023.183.813","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.813","url":null,"abstract":"(K0.48Na0.52)NbO3-0.03Bi0.5Na0.5ZrO3 (KNNS-0.03BNZ) ceramics were prepared doped with 3 mol% Bi0.5Na0.5ZrO3 (BNZ), and the effect of sintering temperature on dielectric and piezoelectric properties of KNNS-0.03BNZ was also investigated. KNNS-0.03BNZ ceramics at all sintering temperatures exhibit a single perovskite structure, and the change of sintering temperature has no significant effect on the phase composition of KNNS 0.03BNZ ceramics. The Raman shifts of the ν1 and ν5 vibration modes have irregular changes in all sintering temperature ranges, indicating that there are polycrystalline phases coexisting in this region. With the change of sintering temperature, Tc slightly shifts to the high temperature direction, and TR-T slightly shifts to the high temperature direction, dielectric constant εr continuously increases, while dielectric loss tanδ firstly decreasing and then increasing. Thanks to the presence of a small amount of liquid phase in the ceramics sintered at 1160 ℃, piezoelectric coefficient d33 reaches 280 pC/N.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48887558","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}
Pub Date : 2023-07-20DOI: 10.15251/djnb.2023.183.821
T. Khan, E. H. Mirza, N. J. Kurd, M. Naushad, M. U. Ul Haque
In this study, a novel composite is fabricated by incorporating Polyvinyl alcohol (PVA) and Bio-Glass (BG) via the freeze-thaw method. PVA pre-polymer is prepared in three different concentrations i.e. (2%, 5%, and 10%) by dissolving PVA powder in distilled water by using a hot plate magnetic stirrer at 80° C, and a constant concentration of BG i.e 2% is added into each PVA prepolymer. Total six specimens including (PVA (2%), PVA (5%), PVA (10%), PVA (2%)/BG (2%), PVA (5%)/BG (2%), and PVA (10%)/ BG (2%) were prepared in which pure PVA specimens acts as a control group. The physicochemical and mechanical properties of the specimens were examined. Various characterization tests such as scanning electron microscopy (SEM), swelling analysis, degradability analysis, hygroscopicity, pH sensitivity, tensile analysis, gel fraction test, water vapor transmission rate (WVTR), and, contact angle analysis were performed on the samples. SEM analysis showed that with the increase in PVA concentration, the material becomes smoother and more compact. Results from the current study showed that tensile strength, degradation rate, and get content are directly proportional to PVA concentration, while swelling capacity, pH sensitivity, hygroscopicity, WVTR, and hydrophilicity are inversely related to PVA concentration. Moreover, with the addition of BG, tensile strength, degradation rate, pH sensitivity, swelling capability, hydrophilicity, and, gel content of the specimens is increased, whereas, WVTR is decreased and, hygroscopicity remains unchanged. Furthermore, results from this study must be taken a step ahead & biocompatibility must be tested to evaluate the biological performance.
{"title":"Fabrication and in vitro evaluation of polyvinyl alcohol/bio-glass composite for potential wound healing applications","authors":"T. Khan, E. H. Mirza, N. J. Kurd, M. Naushad, M. U. Ul Haque","doi":"10.15251/djnb.2023.183.821","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.821","url":null,"abstract":"In this study, a novel composite is fabricated by incorporating Polyvinyl alcohol (PVA) and Bio-Glass (BG) via the freeze-thaw method. PVA pre-polymer is prepared in three different concentrations i.e. (2%, 5%, and 10%) by dissolving PVA powder in distilled water by using a hot plate magnetic stirrer at 80° C, and a constant concentration of BG i.e 2% is added into each PVA prepolymer. Total six specimens including (PVA (2%), PVA (5%), PVA (10%), PVA (2%)/BG (2%), PVA (5%)/BG (2%), and PVA (10%)/ BG (2%) were prepared in which pure PVA specimens acts as a control group. The physicochemical and mechanical properties of the specimens were examined. Various characterization tests such as scanning electron microscopy (SEM), swelling analysis, degradability analysis, hygroscopicity, pH sensitivity, tensile analysis, gel fraction test, water vapor transmission rate (WVTR), and, contact angle analysis were performed on the samples. SEM analysis showed that with the increase in PVA concentration, the material becomes smoother and more compact. Results from the current study showed that tensile strength, degradation rate, and get content are directly proportional to PVA concentration, while swelling capacity, pH sensitivity, hygroscopicity, WVTR, and hydrophilicity are inversely related to PVA concentration. Moreover, with the addition of BG, tensile strength, degradation rate, pH sensitivity, swelling capability, hydrophilicity, and, gel content of the specimens is increased, whereas, WVTR is decreased and, hygroscopicity remains unchanged. Furthermore, results from this study must be taken a step ahead & biocompatibility must be tested to evaluate the biological performance.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43524605","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}
Pub Date : 2023-07-20DOI: 10.15251/djnb.2023.183.793
S. Abbas, E. Hassan, O. Abdulmunem
In this study, RF-sputtering was used to hydrothermally produce zinc oxide nanorods (ZnO NRs) on the seed layer of ZnO/Glass substrates. at different thicknesses (t1 = 1135 nm, t2 = 1306 nm, t3 = 1437 nm, t4 = 1533 nm). The structural properties were studied by X-ray diffraction, which showed that ZnO NRs and the seed layer films are polycrystalline with the same preferred reflection for the (002) plane, and the grain size of the seed layer ranges between 19.51 nm and 30.45 nm for thicknesses t1 and t4, respectively. The measurements of the FESEM showed aspect ratios for ZnO NRs ranging from 3.03 for t1 to 4.9 for t4, with growth in different shapes: ZnO NR rods for t1, flowers and rod-like shapes for thicknesses of t2 and t3, and hexagonal-rod-like shapes in t4. Optical measurements showed a decrease in the transmittance and an increase in the energy gap values with increasing thickness.
{"title":"The difference in the type of zinc oxide nanostructures depending on the growth layer","authors":"S. Abbas, E. Hassan, O. Abdulmunem","doi":"10.15251/djnb.2023.183.793","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.793","url":null,"abstract":"In this study, RF-sputtering was used to hydrothermally produce zinc oxide nanorods (ZnO NRs) on the seed layer of ZnO/Glass substrates. at different thicknesses (t1 = 1135 nm, t2 = 1306 nm, t3 = 1437 nm, t4 = 1533 nm). The structural properties were studied by X-ray diffraction, which showed that ZnO NRs and the seed layer films are polycrystalline with the same preferred reflection for the (002) plane, and the grain size of the seed layer ranges between 19.51 nm and 30.45 nm for thicknesses t1 and t4, respectively. The measurements of the FESEM showed aspect ratios for ZnO NRs ranging from 3.03 for t1 to 4.9 for t4, with growth in different shapes: ZnO NR rods for t1, flowers and rod-like shapes for thicknesses of t2 and t3, and hexagonal-rod-like shapes in t4. Optical measurements showed a decrease in the transmittance and an increase in the energy gap values with increasing thickness.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46892063","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}
Pub Date : 2023-07-02DOI: 10.15251/djnb.2023.182.773
D. S. More, M. Moloto
Generally, salt precursors have been investigated for the production of nanoparticles with semiconducting properties such as metal chalcogenides and others. They have demonstrated excellent features for the ease of converting them to nanoparticles. Thermal decomposition and solvothermal processes are often followed to produce particles with stabilizers of varied ranges of size with improved size control dependent on the set collective conditions and the intended applications. In this study, silver (Ag) and copper (Cu) nanoparticles were synthesized using the thermal decomposition method in the presence of oleylamine as a capping agent in order to produce good stable uniform monodispersed nanoparticles. Lower amounts of Ag and Cu precursors (0.1 - 0.2 g) were used to study their effect on the size and morphology of the nanoparticles. The synthesized nanoparticles under various conditions were characterized using UV/Vis and PL spectroscopy, TEM, and XRD. It was observed that an increase in the precursor concentration led to an increase in particle size with varying morphologies for both Ag and Cu nanoparticles. The TEM images of Ag nanoparticles showed that uniform morphology and spherical shape were observed with narrow diameters ranging from 5.9 to 6.8 nm. However, for Cu nanoparticles, uniform morphology and spherical shape were only observed at a precursor concentration of 0.15 g with an average diameter of 7.8 nm. The XRD results of both Ag and Cu nanoparticles showed peaks that were identified as Ag and Cu in the face-centred cubic.
{"title":"Silver and copper nanoparticles: Lower concentration controlled thermal decomposition of their salt precursors","authors":"D. S. More, M. Moloto","doi":"10.15251/djnb.2023.182.773","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.773","url":null,"abstract":"Generally, salt precursors have been investigated for the production of nanoparticles with semiconducting properties such as metal chalcogenides and others. They have demonstrated excellent features for the ease of converting them to nanoparticles. Thermal decomposition and solvothermal processes are often followed to produce particles with stabilizers of varied ranges of size with improved size control dependent on the set collective conditions and the intended applications. In this study, silver (Ag) and copper (Cu) nanoparticles were synthesized using the thermal decomposition method in the presence of oleylamine as a capping agent in order to produce good stable uniform monodispersed nanoparticles. Lower amounts of Ag and Cu precursors (0.1 - 0.2 g) were used to study their effect on the size and morphology of the nanoparticles. The synthesized nanoparticles under various conditions were characterized using UV/Vis and PL spectroscopy, TEM, and XRD. It was observed that an increase in the precursor concentration led to an increase in particle size with varying morphologies for both Ag and Cu nanoparticles. The TEM images of Ag nanoparticles showed that uniform morphology and spherical shape were observed with narrow diameters ranging from 5.9 to 6.8 nm. However, for Cu nanoparticles, uniform morphology and spherical shape were only observed at a precursor concentration of 0.15 g with an average diameter of 7.8 nm. The XRD results of both Ag and Cu nanoparticles showed peaks that were identified as Ag and Cu in the face-centred cubic.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45260673","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}
Pub Date : 2023-07-02DOI: 10.15251/djnb.2023.182.767
R. Vasanthapriya, N. Neelakandeswari, K. Uthayarani, M. Chitra
Titanium oxide (TiO2) nanostructures with different morphologies ranging from spheres, rods to sheets were prepared using solvothermal route. The effects of pH on the structural, morphological and optical properties of TiO2 nanoparticles were investigated. Nanostructures are characterized using Attenuated Total Reflectance (ATR), Powder X-ray Diffractometer (XRD), Scanning electron Microscope (SEM) and UV- Visible Spectroscopy.
{"title":"Effect of pH on the morphology of TiO2 nanostructures","authors":"R. Vasanthapriya, N. Neelakandeswari, K. Uthayarani, M. Chitra","doi":"10.15251/djnb.2023.182.767","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.767","url":null,"abstract":"Titanium oxide (TiO2) nanostructures with different morphologies ranging from spheres, rods to sheets were prepared using solvothermal route. The effects of pH on the structural, morphological and optical properties of TiO2 nanoparticles were investigated. Nanostructures are characterized using Attenuated Total Reflectance (ATR), Powder X-ray Diffractometer (XRD), Scanning electron Microscope (SEM) and UV- Visible Spectroscopy.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41340984","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}
Pub Date : 2023-07-02DOI: 10.15251/djnb.2023.183.783
S. Cavalu, F. Beteg, P. M. Pasca, M. Moisa, O. Pop, A. Antonescu, C. Cheregi, F. Manole
Collagen membranes have been widely investigated in animal studies and human clinical studies, and have demonstrated excellent biocompatibility, biodegradability and cell affinity. Membrane porosity and 3D architecture are considered to be crucial for cellular infiltration and proliferation, in the process of wound heling. In this context, the aim of our study was the prepare and to investigate comparatively the structural and morphological properties of collagenic membranes modified with a natural bio-compound (respectively azelaic acid) and to evaluate their bio-integration and immune response in the framework of an animal model. Our results shown a porous structure with a honeycomb-style architecture achieved as a result of azelaic acid incorporation in collagenic membrane, with a beneficial effect on tissue remodelling and rapid healing. The bio-integration of azelaic acid-collagenic membrane was faster compared to pure collagenic one, with only minor inflammatory events.
{"title":"Collagenic membranes modified with natural compound for improved bio-integration: structural, morphological and histological analysis","authors":"S. Cavalu, F. Beteg, P. M. Pasca, M. Moisa, O. Pop, A. Antonescu, C. Cheregi, F. Manole","doi":"10.15251/djnb.2023.183.783","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.783","url":null,"abstract":"Collagen membranes have been widely investigated in animal studies and human clinical studies, and have demonstrated excellent biocompatibility, biodegradability and cell affinity. Membrane porosity and 3D architecture are considered to be crucial for cellular infiltration and proliferation, in the process of wound heling. In this context, the aim of our study was the prepare and to investigate comparatively the structural and morphological properties of collagenic membranes modified with a natural bio-compound (respectively azelaic acid) and to evaluate their bio-integration and immune response in the framework of an animal model. Our results shown a porous structure with a honeycomb-style architecture achieved as a result of azelaic acid incorporation in collagenic membrane, with a beneficial effect on tissue remodelling and rapid healing. The bio-integration of azelaic acid-collagenic membrane was faster compared to pure collagenic one, with only minor inflammatory events.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46537775","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}
Pub Date : 2023-07-02DOI: 10.15251/djnb.2023.182.751
Q. Song, F. Hao, Y. Zhang, Q. Li, J. Li
In this paper, Cr2O3-25TiO2 composite coatings were prepared on the surface of steel structure samples by atmospheric plasma spraying. The phase composition, microstructure, microhardness and long-term immersion corrosion behavior in 3.5 wt.% NaCl solution of Cr2O3-25TiO2 composite coatings were studied. The corrosion behavior of Cr2O3-25TiO2 composite coating was analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy. The impedance data were fitted into an appropriate equivalent circuit to explain the electrochemical corrosion behavior of the coating at different stages. The results of scanning electron microscopy showed that the Cr2O3-25TiO2 composite coating was agglomerated, and the rhombohedral Cr2O3 powder was wrapped around the rhombohedral TiO2 powder. The coating melted completely without obvious defected. The XRD results showed that no phase transformation occurred in the Cr2O3-25TiO2 composite coating. The Cr2O3-25TiO2 coatings showed high corrosion resistance and good passivation behavior in the initial stage of corrosion. The coating itself did not corrode. With the extension of corrosion time, the corrosive medium had passed through the pores between the coatings, resulting in the contact between the corrosive medium and the matrix interface, resulting in the matrix corrosion damage. Corrosion products would deposit on the surface of the coating, blocking the pores between the coatings, and the corrosion rate would be reduced.
{"title":"Electrochemical corrosion behavior of plasma sprayed Cr2O3-25TiO2 composite coatings","authors":"Q. Song, F. Hao, Y. Zhang, Q. Li, J. Li","doi":"10.15251/djnb.2023.182.751","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.751","url":null,"abstract":"In this paper, Cr2O3-25TiO2 composite coatings were prepared on the surface of steel structure samples by atmospheric plasma spraying. The phase composition, microstructure, microhardness and long-term immersion corrosion behavior in 3.5 wt.% NaCl solution of Cr2O3-25TiO2 composite coatings were studied. The corrosion behavior of Cr2O3-25TiO2 composite coating was analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy. The impedance data were fitted into an appropriate equivalent circuit to explain the electrochemical corrosion behavior of the coating at different stages. The results of scanning electron microscopy showed that the Cr2O3-25TiO2 composite coating was agglomerated, and the rhombohedral Cr2O3 powder was wrapped around the rhombohedral TiO2 powder. The coating melted completely without obvious defected. The XRD results showed that no phase transformation occurred in the Cr2O3-25TiO2 composite coating. The Cr2O3-25TiO2 coatings showed high corrosion resistance and good passivation behavior in the initial stage of corrosion. The coating itself did not corrode. With the extension of corrosion time, the corrosive medium had passed through the pores between the coatings, resulting in the contact between the corrosive medium and the matrix interface, resulting in the matrix corrosion damage. Corrosion products would deposit on the surface of the coating, blocking the pores between the coatings, and the corrosion rate would be reduced.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45802517","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}
Pub Date : 2023-07-02DOI: 10.15251/djnb.2023.182.713
B. Basha, K. Shaaban, E. A. Abdel Wahab
A series of phosphate glass with the following formulation was manufactured using the melt quenching procedure: 3As2O3 – 37PbO – (60 − 𝑥𝑥) P2O5- 𝑥𝑥 WO3, 𝑥𝑥 = (0 ≤ 𝑥𝑥 ≤ 5 mol. %). The glasses' physical and other structural characteristics were examined in depth. The basic structural properties of the materials were examined using a variety of characterization procedures, such as XRD and FT-IR. With increasing WO3 concentration, the phosphate network evolves, leading to depolymerization of the glass network, according to the FT-IR analysis. With increasing WO3, the physical, mechanical, and structural parameters were enhanced like glass density, longitudinal and shear speeds, and all elastic moduli. Because of P–O–W bonds in the glass network are stronger than P–O– P bonds, the radiation characteristics were enhanced as the content of WO3 increased. The interpretation of the parameters showed that the glass in the statement is an excellent candidate for photon shielding applications.
一系列磷酸盐玻璃具有以下配方是生产使用熔体淬火过程:3 as2o3 - 37 pbo(60−𝑥𝑥)P2O5——𝑥𝑥WO3,𝑥𝑥=(0≤𝑥𝑥≤5摩尔。%)。对玻璃的物理和其他结构特性进行了深入的研究。采用XRD和FT-IR等多种表征手段对材料的基本结构性能进行了表征。根据FT-IR分析，随着WO3浓度的增加，磷酸盐网络演变，导致玻璃网络解聚。随着WO3的增加，玻璃密度、纵向和剪切速度以及所有弹性模量等物理、机械和结构参数都得到了增强。由于玻璃网络中的P - o - w键比P - o - P键更强，因此随着WO3含量的增加，辐射特性增强。对参数的解释表明，声明中的玻璃是光子屏蔽应用的理想候选者。
{"title":"The effect of tungsten ions on the structural, elastic moduli, and shielding characteristics of arsenic lead phosphate glasses","authors":"B. Basha, K. Shaaban, E. A. Abdel Wahab","doi":"10.15251/djnb.2023.182.713","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.713","url":null,"abstract":"A series of phosphate glass with the following formulation was manufactured using the melt quenching procedure: 3As2O3 – 37PbO – (60 − 𝑥𝑥) P2O5- 𝑥𝑥 WO3, 𝑥𝑥 = (0 ≤ 𝑥𝑥 ≤ 5 mol. %). The glasses' physical and other structural characteristics were examined in depth. The basic structural properties of the materials were examined using a variety of characterization procedures, such as XRD and FT-IR. With increasing WO3 concentration, the phosphate network evolves, leading to depolymerization of the glass network, according to the FT-IR analysis. With increasing WO3, the physical, mechanical, and structural parameters were enhanced like glass density, longitudinal and shear speeds, and all elastic moduli. Because of P–O–W bonds in the glass network are stronger than P–O– P bonds, the radiation characteristics were enhanced as the content of WO3 increased. The interpretation of the parameters showed that the glass in the statement is an excellent candidate for photon shielding applications.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45153722","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}
Pub Date : 2023-07-02DOI: 10.15251/djnb.2023.182.689
D. Mei, J. Qi, D. Guo, Y. Yan, Wei Zhao
To investigate the influence of CeO2 nanoparticles on the evaporation characteristics of fuel droplets, numerical simulation for single nano-fuel droplet evaporation was conducted based on ANSYS FLUENT software according to the single droplet evaporation visualization experiment. And the effects of nanoparticles’ concentration and size on the temperature and fuel-vapor concentration during the evaporation of were emphatically discussed. The simulation results showed that the temperature field and concentration field were distributed in a gradient. Nano-fuel droplets absorbed heat from the external environment, and the temperature of the nano-fuel droplets kept rising until reaching the evaporation equilibrium temperature. The evaporation equilibrium temperature of nano-fuels droplets was higher than that of N-tetradecane (C14) at the temperature of 573 K. In addition, it increased with the increment of nanoparticle concentration and reduction of the nanoparticle size. In the beginning of the evaporation, the vapor volume fraction of nano-fuel was relatively low and it increased slowly with time. As the evaporation process continued, the evaporation rate of nano-fuel droplets increased. The liquid nano-fuel was constantly evaporating to the fuel vapor, and the vapor volume fraction was increased. The vapor volume fraction was increased during the same evaporation period when elevated nanoparticles concentration and minished nanoparticles size.
{"title":"Simulation study on the single droplet evaporation of N-tetradecane with CeO2 nanoparticles","authors":"D. Mei, J. Qi, D. Guo, Y. Yan, Wei Zhao","doi":"10.15251/djnb.2023.182.689","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.689","url":null,"abstract":"To investigate the influence of CeO2 nanoparticles on the evaporation characteristics of fuel droplets, numerical simulation for single nano-fuel droplet evaporation was conducted based on ANSYS FLUENT software according to the single droplet evaporation visualization experiment. And the effects of nanoparticles’ concentration and size on the temperature and fuel-vapor concentration during the evaporation of were emphatically discussed. The simulation results showed that the temperature field and concentration field were distributed in a gradient. Nano-fuel droplets absorbed heat from the external environment, and the temperature of the nano-fuel droplets kept rising until reaching the evaporation equilibrium temperature. The evaporation equilibrium temperature of nano-fuels droplets was higher than that of N-tetradecane (C14) at the temperature of 573 K. In addition, it increased with the increment of nanoparticle concentration and reduction of the nanoparticle size. In the beginning of the evaporation, the vapor volume fraction of nano-fuel was relatively low and it increased slowly with time. As the evaporation process continued, the evaporation rate of nano-fuel droplets increased. The liquid nano-fuel was constantly evaporating to the fuel vapor, and the vapor volume fraction was increased. The vapor volume fraction was increased during the same evaporation period when elevated nanoparticles concentration and minished nanoparticles size.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48551965","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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