Nowadays, nanomaterials have become the research hot topic by the virtue of their fascinating attributions in human civilization. Zinc phosphate nanoparticles (ZnPNPs), an inorganic material, possess some unique features, such as high thermal stability, low solubility in corrosive media, biocompatibility, non-toxicity and luminescence property. As a result, ZnPNPs have enormously been explored by researchers in many important applications, such as anticorrosion pigment, drug delivery, antibacterial as well as anticancer agents, biocatalyst, lubricant additives, regeneration of bone tissues and removal of toxic metal from the environmental samples, and so on. Considering diversified applications potential, morphologically different ZnPNPs have mainly been fabricated by precipitation, sonochemical and biological methods. The surface property of ZnPNPs differs with pH, temperature, reaction time, and substrate concentrations. One-step in situ and facile synthetic procedures, as well as greener synthesis protocols of ZnPNPs can be advantageous over conventional methods to eliminate toxic chemicals and by-products. In addition, both artificial and natural polymer-modified ZnPNPs would offer improved properties, such as better colloidal stability, option for further functionalization, and render desired biocompatibility of prepared hybrid nanocomposite particles in applying for targeted applications. Furthermore, both in vitro and in vivo studies of polymer functionalized ZnPNPs can be an attractive research topic in biotechnological and electrochemical fields. Therefore, the current review provides a summary of the recent progress on the fabrication methods, an opportunity for the future directions to the researchers in the improvement of shape-selective synthesis and application potentials of ZnPNPs.
{"title":"Recent Progress in Synthesis and Applications of Zinc Phosphate Nanoparticles: A Review","authors":"Tonmoye Sarkar Shathi, Md Abdur Rahman, H. Ahmad, Md. Rabiul Karim","doi":"10.4028/p-32n2t8","DOIUrl":"https://doi.org/10.4028/p-32n2t8","url":null,"abstract":"Nowadays, nanomaterials have become the research hot topic by the virtue of their fascinating attributions in human civilization. Zinc phosphate nanoparticles (ZnPNPs), an inorganic material, possess some unique features, such as high thermal stability, low solubility in corrosive media, biocompatibility, non-toxicity and luminescence property. As a result, ZnPNPs have enormously been explored by researchers in many important applications, such as anticorrosion pigment, drug delivery, antibacterial as well as anticancer agents, biocatalyst, lubricant additives, regeneration of bone tissues and removal of toxic metal from the environmental samples, and so on. Considering diversified applications potential, morphologically different ZnPNPs have mainly been fabricated by precipitation, sonochemical and biological methods. The surface property of ZnPNPs differs with pH, temperature, reaction time, and substrate concentrations. One-step in situ and facile synthetic procedures, as well as greener synthesis protocols of ZnPNPs can be advantageous over conventional methods to eliminate toxic chemicals and by-products. In addition, both artificial and natural polymer-modified ZnPNPs would offer improved properties, such as better colloidal stability, option for further functionalization, and render desired biocompatibility of prepared hybrid nanocomposite particles in applying for targeted applications. Furthermore, both in vitro and in vivo studies of polymer functionalized ZnPNPs can be an attractive research topic in biotechnological and electrochemical fields. Therefore, the current review provides a summary of the recent progress on the fabrication methods, an opportunity for the future directions to the researchers in the improvement of shape-selective synthesis and application potentials of ZnPNPs.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"1 1","pages":"59 - 88"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89674706","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}
In recent years, nickel tungstate has attracted considerable research interest as an electrode material for supercapacitors. In this work, NiWO4 was synthesized by co-precipitation and exposed to laser irradiation. The structure of nickel tungstate was investigated by X-ray diffraction and its electrochemical properties by potentiodynamics, galvanostatic and impedance spectroscopy methods. The results show that NiWO4 subjected to laser irradiation for 180 s showed higher specific characteristics than the initial material. Namely, at a discharge current of 1 mA, NiWO4 achieves a specific capacitance of 153 F/g, and this value is 48% higher than that of the initial material. The higher specific characteristics of laser-modified NiWO4 result from the ability of the material to interact better with electrolyte ions due to the passage of fast redox reactions and the capacitance of the electrical double layer, which is confirmed by impedance studies.
{"title":"Structure and Electrochemical Properties of Laser-Modified NiWO4","authors":"Y. Starchuk, O. Popovych, B. Rachiy, I. Budzulyak","doi":"10.4028/p-zsl47l","DOIUrl":"https://doi.org/10.4028/p-zsl47l","url":null,"abstract":"In recent years, nickel tungstate has attracted considerable research interest as an electrode material for supercapacitors. In this work, NiWO4 was synthesized by co-precipitation and exposed to laser irradiation. The structure of nickel tungstate was investigated by X-ray diffraction and its electrochemical properties by potentiodynamics, galvanostatic and impedance spectroscopy methods. The results show that NiWO4 subjected to laser irradiation for 180 s showed higher specific characteristics than the initial material. Namely, at a discharge current of 1 mA, NiWO4 achieves a specific capacitance of 153 F/g, and this value is 48% higher than that of the initial material. The higher specific characteristics of laser-modified NiWO4 result from the ability of the material to interact better with electrolyte ions due to the passage of fast redox reactions and the capacitance of the electrical double layer, which is confirmed by impedance studies.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"56 97 1","pages":"51 - 57"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77611600","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}
In the current study, exceptional and reasonable heterogeneous ZnO/PVP nanocatalysts were synthesized via the chemical reduction method followed by ultra-sonication for methyl orange degradation in the aqueous medium. The synthesized nanocatalysts were confirmed using different characterization techniques such as Energy Dispersive X-ray, Scanning Electron Microscope, X-ray diffraction analysis, Zeta Potential, Dynamic light Scattering, UV-Visible spectroscopy, and Fourier Transform Infrared Spectroscopy. To validate the competency of the nanocatalysts as the photocatalyst, the synthesized ZnO/PVP nanocatalysts were applied to the degradation of methyl orange dye. Lastly, the fabricated catalyst demonstrated splendid catalytic efficiency; within 90 seconds, more than 98% degradation of methyl orange dye was perceived using 150 μg nanocatalysts dose in the aqueous medium. The fabricated ZnO/PVP nanocatalysts illustrate many benefits above traditional routes for degrading the toxic and hazardous dye, like a short time, high percentile of degradation, the least amount of nanocatalysts, and admirable reusability. On the above facts, it is recommended that these viable and effective nanocatalysts can be applied successfully on the commercial level for degradation hazard pollutants.
{"title":"Fabrication and Catalytic Efficiency of ZnO/PVP Nanocatalysts: A Tremendous Applicant for Methyl Orange Dye Degradation in Aqueous Medium","authors":"Z. A. Mahar, G. Q. Shar, A. Balouch","doi":"10.4028/p-4d46jr","DOIUrl":"https://doi.org/10.4028/p-4d46jr","url":null,"abstract":"In the current study, exceptional and reasonable heterogeneous ZnO/PVP nanocatalysts were synthesized via the chemical reduction method followed by ultra-sonication for methyl orange degradation in the aqueous medium. The synthesized nanocatalysts were confirmed using different characterization techniques such as Energy Dispersive X-ray, Scanning Electron Microscope, X-ray diffraction analysis, Zeta Potential, Dynamic light Scattering, UV-Visible spectroscopy, and Fourier Transform Infrared Spectroscopy. To validate the competency of the nanocatalysts as the photocatalyst, the synthesized ZnO/PVP nanocatalysts were applied to the degradation of methyl orange dye. Lastly, the fabricated catalyst demonstrated splendid catalytic efficiency; within 90 seconds, more than 98% degradation of methyl orange dye was perceived using 150 μg nanocatalysts dose in the aqueous medium. The fabricated ZnO/PVP nanocatalysts illustrate many benefits above traditional routes for degrading the toxic and hazardous dye, like a short time, high percentile of degradation, the least amount of nanocatalysts, and admirable reusability. On the above facts, it is recommended that these viable and effective nanocatalysts can be applied successfully on the commercial level for degradation hazard pollutants.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"2015 1","pages":"121 - 138"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86995063","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}
Olha Hrytsenko, Dmytro Hrytsenko, V. Shvalagin, G. Grodziuk
Smart packaging becomes more popular as it increases the safety of food consumption by monitoring a packaged food state and informing the customer about it, for example, by visual reaction of a special label on its surface. Nanomaterials can provide the needed functionality to such labels. Application of ink compositions containing silver nanoparticles on paper materials by screen printing is quite promising. A special ink composition was developed based on Ag nanoparticles that possess changeable photoluminescence properties in contact with compounds that indicate food decay. The possibility of application of this ink onto the surface of paper-based materials via screen printing was studied. The influence of ink layer thickness, characteristics of paper materials (degree of sizing, content of optical brighteners), and content of the fluorescent component in the ink composition on photoluminescence properties of printed labels for smart packaging was investigated. It was determined how to choose proper values of these technological parameters in order to obtain high luminescence intensity and predetermined luminescence color of printed labels using the developed nanophotonic inks. The results of the study allow industrial production of functional labels for smart packaging with nanophotonic elements with the needed optical (photoluminescence) characteristics, as well as for protecting packaging from counterfeiting.
{"title":"Photoluminescence Properties of Nanophotonic Labels Based on Ag Nanoparticles for Smart Packaging Produced by Screen Printing","authors":"Olha Hrytsenko, Dmytro Hrytsenko, V. Shvalagin, G. Grodziuk","doi":"10.4028/p-b8x65k","DOIUrl":"https://doi.org/10.4028/p-b8x65k","url":null,"abstract":"Smart packaging becomes more popular as it increases the safety of food consumption by monitoring a packaged food state and informing the customer about it, for example, by visual reaction of a special label on its surface. Nanomaterials can provide the needed functionality to such labels. Application of ink compositions containing silver nanoparticles on paper materials by screen printing is quite promising. A special ink composition was developed based on Ag nanoparticles that possess changeable photoluminescence properties in contact with compounds that indicate food decay. The possibility of application of this ink onto the surface of paper-based materials via screen printing was studied. The influence of ink layer thickness, characteristics of paper materials (degree of sizing, content of optical brighteners), and content of the fluorescent component in the ink composition on photoluminescence properties of printed labels for smart packaging was investigated. It was determined how to choose proper values of these technological parameters in order to obtain high luminescence intensity and predetermined luminescence color of printed labels using the developed nanophotonic inks. The results of the study allow industrial production of functional labels for smart packaging with nanophotonic elements with the needed optical (photoluminescence) characteristics, as well as for protecting packaging from counterfeiting.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"48 1","pages":"1 - 14"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89969713","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}
N. Petkov, T. Bakalova, H. Bahchedzhiev, P. Kejzlar, Petr Ryšánek, M. Kormunda, P. Čapková
The influence of Al/Ti and Al/Cr ratios on the structural, mechanical and tribological properties of AlTiSiN and AlCrSiN coatings, deposited by the cathodic arc evaporation PVD method at a temperature of 400°C, was investigated. The remains of the original AlSiN hexagonal phase were observed in the obtained coatings as well as the crystallites of cubic TiN and CrN, respectively. XPS analysis assumes the presence of a substoichiometric SiN. The addition of 11 at.% Ti or 13 at.% Cr in AlSiN led to an increase in both the coating’s resistance to plastic deformation and the plasticity index. The addition of 13 at.% and 24 at.% Cr to the AlSiN coating structure resulted in a decrease in the average coefficient of friction with 18% and 36% against a counterpart of Al2O3, respectively, and with 36% for both concentration against steel ball counterpart. The addition of Ti have no influence on the values of the coefficient of friction at using ceramic counterpart, while at steel counterpart decreased it up to 30%. Both element change the abrasion effect of the coating.Keywords:AlCrSiN; AlTiSiN;Cathodic Arc Deposition; Tribological Behaviour; Abrasion Resistance; Nanoindentation
{"title":"Influence of the Addition of the Elements Ti and Cr on the Structure, and Mechanical and Tribological Properties of AlSiN Coatings","authors":"N. Petkov, T. Bakalova, H. Bahchedzhiev, P. Kejzlar, Petr Ryšánek, M. Kormunda, P. Čapková","doi":"10.4028/p-723inm","DOIUrl":"https://doi.org/10.4028/p-723inm","url":null,"abstract":"The influence of Al/Ti and Al/Cr ratios on the structural, mechanical and tribological properties of AlTiSiN and AlCrSiN coatings, deposited by the cathodic arc evaporation PVD method at a temperature of 400°C, was investigated. The remains of the original AlSiN hexagonal phase were observed in the obtained coatings as well as the crystallites of cubic TiN and CrN, respectively. XPS analysis assumes the presence of a substoichiometric SiN. The addition of 11 at.% Ti or 13 at.% Cr in AlSiN led to an increase in both the coating’s resistance to plastic deformation and the plasticity index. The addition of 13 at.% and 24 at.% Cr to the AlSiN coating structure resulted in a decrease in the average coefficient of friction with 18% and 36% against a counterpart of Al2O3, respectively, and with 36% for both concentration against steel ball counterpart. The addition of Ti have no influence on the values of the coefficient of friction at using ceramic counterpart, while at steel counterpart decreased it up to 30%. Both element change the abrasion effect of the coating.Keywords:AlCrSiN; AlTiSiN;Cathodic Arc Deposition; Tribological Behaviour; Abrasion Resistance; Nanoindentation","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"7 1","pages":"175 - 196"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81010302","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 field of nanotechnology has seen rapid advancements over the last decade. Nanofiber production through the method of electrospinning is one of the attraction points in this area. The nanofibers, prepared with nano-sized additives, particularly with polymer, have an extensive range of usages. This study utilizes silica aerogels obtained by the sol-gel method due to their low density of 700-800 gr/m2. Polycaprolactone (PCL)-Silica Aerogel Nanofibers were attained by adding 0.5%,1%, 2%and 4% of previously produced aerogels to the nanofibers formed by electrospinning. This paper correspondingly examined the differences between AC-CL and MET-CL solvent groups being utilized during the preparation of the solutions. In addition to this examination, series of material tests were conducted, such as tensile test, SEM, FTIR, DTA/TG, and BET. Overall, the resultant nanofibers with a property of high surface area can be utilized in the design of materials applied to many areas, including solar devices, solar pools, sensors, and capacitors.
{"title":"Fabrication of Polycaprolactone -Silica Aerogel Nanofibers via Electrospinning Method","authors":"M. Ceylan, E. Yılmaz","doi":"10.4028/p-9w4o39","DOIUrl":"https://doi.org/10.4028/p-9w4o39","url":null,"abstract":"The field of nanotechnology has seen rapid advancements over the last decade. Nanofiber production through the method of electrospinning is one of the attraction points in this area. The nanofibers, prepared with nano-sized additives, particularly with polymer, have an extensive range of usages. This study utilizes silica aerogels obtained by the sol-gel method due to their low density of 700-800 gr/m2. Polycaprolactone (PCL)-Silica Aerogel Nanofibers were attained by adding 0.5%,1%, 2%and 4% of previously produced aerogels to the nanofibers formed by electrospinning. This paper correspondingly examined the differences between AC-CL and MET-CL solvent groups being utilized during the preparation of the solutions. In addition to this examination, series of material tests were conducted, such as tensile test, SEM, FTIR, DTA/TG, and BET. Overall, the resultant nanofibers with a property of high surface area can be utilized in the design of materials applied to many areas, including solar devices, solar pools, sensors, and capacitors.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"36 1","pages":"161 - 174"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88273623","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}
This study deals with the synthesis of cubic shape platinum nanoparticles (Pt NPs) by adjusting the oleylamine (OAm):polyvinylpyrrolidone (PVP) ratio in the solution media. The mass ratios between the OAm:PVP were respectively set to the 1:2, 1:1, 2:1 values. Platinum acetylacetonate (Pt(acac)2) was used as Pt precursor and the reduction of this salt to the metallic Pt was provided by microwave irradiation technique. It is seen that increasing amount of OAm triggers the formation of cubic shape Pt NPs. The average sizes of the Pt NPs fall in the range of 6-8 nm. The unsupported Pt NPs were directly used as a catalyst for the oxygen reduction reaction (ORR). According to the hydrodynamic ORR voltammograms of the catalysts, the Pt NPs prepared with 1:2 (OAm:PVP) exhibit the highest current density at all stirring rates of rotating disc electrode (RDE). Besides, Pt NPs prepared with 2:1 (OAm:PVP) have the minimum charge transfer resistance based on electrochemical impedance spectroscopy (EIS) analysis conducted at 0.9 V. After all these analyses, Pt NPs were synthesized using extra five different ratios (1.5:1, 1:1.5, 2.5:1, 3:1, 1:3) of (OAm:PVP) for thoroughly examining the optimum value for the ORR catalytic activity. As a result, the Pt NPs prepared with a 2.5:1 (OAm:PVP) ratio provided the best performance among all the catalysts.
{"title":"Modulation of the Shape of Platinum Nanoparticles by Using Different Oleylamine/Polyvinylpyrrolidone Amounts","authors":"Ayşenur Öztürk, A. B. Yurtcan","doi":"10.4028/p-b101g1","DOIUrl":"https://doi.org/10.4028/p-b101g1","url":null,"abstract":"This study deals with the synthesis of cubic shape platinum nanoparticles (Pt NPs) by adjusting the oleylamine (OAm):polyvinylpyrrolidone (PVP) ratio in the solution media. The mass ratios between the OAm:PVP were respectively set to the 1:2, 1:1, 2:1 values. Platinum acetylacetonate (Pt(acac)2) was used as Pt precursor and the reduction of this salt to the metallic Pt was provided by microwave irradiation technique. It is seen that increasing amount of OAm triggers the formation of cubic shape Pt NPs. The average sizes of the Pt NPs fall in the range of 6-8 nm. The unsupported Pt NPs were directly used as a catalyst for the oxygen reduction reaction (ORR). According to the hydrodynamic ORR voltammograms of the catalysts, the Pt NPs prepared with 1:2 (OAm:PVP) exhibit the highest current density at all stirring rates of rotating disc electrode (RDE). Besides, Pt NPs prepared with 2:1 (OAm:PVP) have the minimum charge transfer resistance based on electrochemical impedance spectroscopy (EIS) analysis conducted at 0.9 V. After all these analyses, Pt NPs were synthesized using extra five different ratios (1.5:1, 1:1.5, 2.5:1, 3:1, 1:3) of (OAm:PVP) for thoroughly examining the optimum value for the ORR catalytic activity. As a result, the Pt NPs prepared with a 2.5:1 (OAm:PVP) ratio provided the best performance among all the catalysts.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"789 1","pages":"31 - 50"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76928006","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 size-dependent bending and static stability characteristics of nanobeams made of bi-directional functionally graded materials (2D-FGMs) under different boundary conditions are comprehensively investigated. Based on the modified couple stress theory and surface elasticity theory, the size-dependent model is formulated for 2D-FG Euler-Bernoulli beam. The material properties of the beam smoothly change along both the axial and thickness directions according to power-law distribution. The continuous spatial variations of the single material length scale parameter and the three surface constants are incorporated to describe the effects of microstructure and surface energy, respectively. This model accounts for the axial and transverse displacements, the exact position of the physical neutral plane, and Poisson’s effect. To obtain the static response of the present model, Ritz method is employed by approximating the axial and transverse displacements in terms of polynomial forms. Different boundary conditions, i.e., Simply-simply (S-S), Clamped-clamped (C-C), Clamped-simply (C-S), and Clamped-free (C-F), are considered and satisfied by adding auxiliary functions to the displacement functions. Numerical results with various cases of boundary conditions are performed with an insight to explore the effects of gradient indices in thickness and length directions, surface energy, material length scale parameter, slenderness ratio, and thickness on the static deflection and buckling responses of 2D-FG nanobeams. Results disclose that, the material properties, the surface energy, and microstructure effects have a significant effect on the bending, and buckling responses of 2D-FG nanobeams. Hence, this study can be helpful in the design and optimization of 2D-FG nanobeams in bending and buckling responses.
{"title":"A Comprehensive Study of Bending and Stability Responses of 2D-FG Nanobeams Using a Microstructure-Surface Energy-Based Model under Various Boundary Conditions","authors":"M. Attia, R. A. Shanab","doi":"10.4028/p-8ur51p","DOIUrl":"https://doi.org/10.4028/p-8ur51p","url":null,"abstract":"The size-dependent bending and static stability characteristics of nanobeams made of bi-directional functionally graded materials (2D-FGMs) under different boundary conditions are comprehensively investigated. Based on the modified couple stress theory and surface elasticity theory, the size-dependent model is formulated for 2D-FG Euler-Bernoulli beam. The material properties of the beam smoothly change along both the axial and thickness directions according to power-law distribution. The continuous spatial variations of the single material length scale parameter and the three surface constants are incorporated to describe the effects of microstructure and surface energy, respectively. This model accounts for the axial and transverse displacements, the exact position of the physical neutral plane, and Poisson’s effect. To obtain the static response of the present model, Ritz method is employed by approximating the axial and transverse displacements in terms of polynomial forms. Different boundary conditions, i.e., Simply-simply (S-S), Clamped-clamped (C-C), Clamped-simply (C-S), and Clamped-free (C-F), are considered and satisfied by adding auxiliary functions to the displacement functions. Numerical results with various cases of boundary conditions are performed with an insight to explore the effects of gradient indices in thickness and length directions, surface energy, material length scale parameter, slenderness ratio, and thickness on the static deflection and buckling responses of 2D-FG nanobeams. Results disclose that, the material properties, the surface energy, and microstructure effects have a significant effect on the bending, and buckling responses of 2D-FG nanobeams. Hence, this study can be helpful in the design and optimization of 2D-FG nanobeams in bending and buckling responses.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"33 1","pages":"89 - 120"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80919219","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}
Functional nanocomposites have been widely studied in recent years. Because of its non-toxic and inexpensive properties, titanium dioxide has pervasive application value in the chemical industry. Nano-sized antimony-doped tin oxide (ATO) metallic oxide was developed and combined with a pure titanium dioxide substrate by the effective co-precipitation method. The obtained powder had good conductibility, and its carriers were supplied by the infiltrated Sb atoms in tin oxide crystal. In the present work, the calcination temperatures and molar ratio of tin (IV) chloride pentahydrate (SnCl4·5H2O) and antimony (III) chloride (SbCl3) were optimized for achieving excellent electrical performances. As a result, the sheet resistivity of Sb-SnO2/TiO2 was in the range from 9 kΩ·cm to 15 kΩ·cm. By mixing method, the resistance of Sb-SnO2/TiO2/PDMS could be as low as 2 MΩ.
{"title":"Surface Covering of Antimony-Doped Tin Oxide on Titanium Dioxide and Resistivity Analysis","authors":"Ruizhi Gong, Yanfeng Gao, Zhang Chen, Kailing Zhang","doi":"10.4028/p-3m50z6","DOIUrl":"https://doi.org/10.4028/p-3m50z6","url":null,"abstract":"Functional nanocomposites have been widely studied in recent years. Because of its non-toxic and inexpensive properties, titanium dioxide has pervasive application value in the chemical industry. Nano-sized antimony-doped tin oxide (ATO) metallic oxide was developed and combined with a pure titanium dioxide substrate by the effective co-precipitation method. The obtained powder had good conductibility, and its carriers were supplied by the infiltrated Sb atoms in tin oxide crystal. In the present work, the calcination temperatures and molar ratio of tin (IV) chloride pentahydrate (SnCl4·5H2O) and antimony (III) chloride (SbCl3) were optimized for achieving excellent electrical performances. As a result, the sheet resistivity of Sb-SnO2/TiO2 was in the range from 9 kΩ·cm to 15 kΩ·cm. By mixing method, the resistance of Sb-SnO2/TiO2/PDMS could be as low as 2 MΩ.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"117 1","pages":"15 - 29"},"PeriodicalIF":1.7,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81002184","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}
In this study, we research the long-term UV protective effect of BNNSs/PVB multilayer thin film coating on the properties of extra virgin olive oil. Boron nitride nanosheets (BNNSs) were synthesized using the liquid exfoliation method. BNNSs/PVB multilayer thin film was coated on tubes by dip-coating. After the UV irradiation of coated and uncoated glass tubes at different times, the total phenol content (TPC) and antioxidant activity of olive oil (TAA) were determined. Specific absorption coefficients K232 and K270 in the ultraviolet region were measured for estimating the oxidation degree of olive oil after irradiation. Free fatty acid (FFA) in olive oil after UV irradiation was determined by the titration method. Olive oil quality analysis indicates that BNNSs/PVB coating on the glass is effective on the protection of TPC and TAA of olive oil. In addition, the results show that extra virgin olive oil in the coated glass tube is maintained nearly 2 times more than the amount of phenol in the uncoated tube. While olive oil samples in glass tube coated with 30 and 50 times exceeded the limit of K270 value (0.22) after 400 hrs, it was determined that olive oil samples in uncoated glass exceeded this limit after 215 hrs. After 720 hours of UV irradiation, the free fatty acid value of the UCOL (uncoated) sample increased by 24.7% compared to the initial value, while the increase in the COL50 (coated) sample was 15%.
{"title":"Synthesis of Boron Nitride Nanosheets/Polyvinyl Butyral Thin Film: An Efficient Coating for UV Protection of Extra Virgin Olive Oil in Glass Bottles","authors":"D. Kuru, A. Akpinar Borazan, N. Ay","doi":"10.4028/p-nly582","DOIUrl":"https://doi.org/10.4028/p-nly582","url":null,"abstract":"In this study, we research the long-term UV protective effect of BNNSs/PVB multilayer thin film coating on the properties of extra virgin olive oil. Boron nitride nanosheets (BNNSs) were synthesized using the liquid exfoliation method. BNNSs/PVB multilayer thin film was coated on tubes by dip-coating. After the UV irradiation of coated and uncoated glass tubes at different times, the total phenol content (TPC) and antioxidant activity of olive oil (TAA) were determined. Specific absorption coefficients K232 and K270 in the ultraviolet region were measured for estimating the oxidation degree of olive oil after irradiation. Free fatty acid (FFA) in olive oil after UV irradiation was determined by the titration method. Olive oil quality analysis indicates that BNNSs/PVB coating on the glass is effective on the protection of TPC and TAA of olive oil. In addition, the results show that extra virgin olive oil in the coated glass tube is maintained nearly 2 times more than the amount of phenol in the uncoated tube. While olive oil samples in glass tube coated with 30 and 50 times exceeded the limit of K270 value (0.22) after 400 hrs, it was determined that olive oil samples in uncoated glass exceeded this limit after 215 hrs. After 720 hours of UV irradiation, the free fatty acid value of the UCOL (uncoated) sample increased by 24.7% compared to the initial value, while the increase in the COL50 (coated) sample was 15%.","PeriodicalId":16525,"journal":{"name":"Journal of Nano Research","volume":"50 1","pages":"37 - 51"},"PeriodicalIF":1.7,"publicationDate":"2022-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80760599","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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