Pub Date : 2022-09-30DOI: 10.35745/afm2022v02.03.0005
H. R. Dehghanpour, P. Parvin, A. Younesi, Monireh Gilaki
To assess the result of the stirring process on the Fe3O4 nanoparticles' properties, two types of stirrings (mechanical and magnetic) were compared. Fe3O4 nanoparticles were generated by chemical precipitation. Oleic acid covered the nanoparticles as a surfactant performer. X-ray diffraction (XRD) was used to investigate the fine grains sample, and scanning electron microscope (SEM) images were used for observing the nanoparticles’ geometry. The vibrating sample magnetometer (VSM) was also used to examine the magnetic characteristic of the nanoparticles. Chemical bonds were determined by using Fourier transform infrared spectroscopy (FTIR). As a result, the hysteresis loop characterized the magnetic nanoparticles. Magnetite nanoparticles are regarded as a soft magnetic material due to their low coercivity. XRD diagrams show the presence of powerful peaks in the orientations of crystal surfaces of the spinel form of the nanoparticles. The result showed that nanoparticles were nearly spherical. The average dimensions of the nanoparticles were estimated by Scherrer approximation. The mean particle dimensions were 11 nm (chemical mixer) and 13 nm (magnet mixer). SEM images verified the spherical shape of the nanoparticles, and FTIR confirmed the constitution of Fe-O bonds and validated the spinel ferrites configuration.
{"title":"Effect of Agitation Methods on Characteristics of Iron Ferrite Nanoparticles Synthesized by Co-Precipitation Process","authors":"H. R. Dehghanpour, P. Parvin, A. Younesi, Monireh Gilaki","doi":"10.35745/afm2022v02.03.0005","DOIUrl":"https://doi.org/10.35745/afm2022v02.03.0005","url":null,"abstract":"To assess the result of the stirring process on the Fe3O4 nanoparticles' properties, two types of stirrings (mechanical and magnetic) were compared. Fe3O4 nanoparticles were generated by chemical precipitation. Oleic acid covered the nanoparticles as a surfactant performer. X-ray diffraction (XRD) was used to investigate the fine grains sample, and scanning electron microscope (SEM) images were used for observing the nanoparticles’ geometry. The vibrating sample magnetometer (VSM) was also used to examine the magnetic characteristic of the nanoparticles. Chemical bonds were determined by using Fourier transform infrared spectroscopy (FTIR). As a result, the hysteresis loop characterized the magnetic nanoparticles. Magnetite nanoparticles are regarded as a soft magnetic material due to their low coercivity. XRD diagrams show the presence of powerful peaks in the orientations of crystal surfaces of the spinel form of the nanoparticles. The result showed that nanoparticles were nearly spherical. The average dimensions of the nanoparticles were estimated by Scherrer approximation. The mean particle dimensions were 11 nm (chemical mixer) and 13 nm (magnet mixer). SEM images verified the spherical shape of the nanoparticles, and FTIR confirmed the constitution of Fe-O bonds and validated the spinel ferrites configuration.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84474353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.35745/afm2022v02.03.0004
T. Wu, Guoxiang Peng, Wei-Ren Zhang, Cheng-Fu Yang
The solid-state reaction method was used to synthesize 0.025Eu2+-doped CaMgSi2O6 (Eu-CaMgSi2O6) powder in the reduction atmosphere of 5% H2 + 95% N2 at 1300oC with a duration of 4 h. The reduction atmosphere was removed when the temperature was down to 800oC. The XRD pattern showed that only the CaMgSi2O6 phase was observed in synthesized 0.025Eu2+-doped CaMgSi2O6 powder. Room-temperature photoluminescence excitation (PLE) and photoluminescence (PL) spectra of Eu-CaMgSi2O6 phosphors were recorded by using the Hitachi F-4500 fluorescence spectrophotometer at wavelength ranges of 200–430 and 350–600 nm, respectively. A new important finding is that the synthesized Eu-CaMgSi2O6 phosphor has three important PLE wavelengths. Therefore, Eu-CaMgSi2O6 phosphors are measured from 25oC (room temperature) to 200oC under three different PLE wavelengths to find the effect of temperature on the variations of maximum photoluminescence intensities (PLmax). All the PL spectra show that only one emission band with a central wavelength of 449 nm is found, which is independent of the PLE wavelengths and is caused by the transition of 4f7 → 4f65d1. Another important finding is that the different PLE wavelengths have an apparent effect on the PLmax value of the Eu-CaMgSi2O6 phosphor. Finally, the decay-time curves of Eu-CaMgSi2O6 phosphor under three PLE wavelengths are also investigated.
{"title":"Temperature-dependent Photoluminescence Properties of Eu2+-doped CaMgSi2O6 Phosphors","authors":"T. Wu, Guoxiang Peng, Wei-Ren Zhang, Cheng-Fu Yang","doi":"10.35745/afm2022v02.03.0004","DOIUrl":"https://doi.org/10.35745/afm2022v02.03.0004","url":null,"abstract":"The solid-state reaction method was used to synthesize 0.025Eu2+-doped CaMgSi2O6 (Eu-CaMgSi2O6) powder in the reduction atmosphere of 5% H2 + 95% N2 at 1300oC with a duration of 4 h. The reduction atmosphere was removed when the temperature was down to 800oC. The XRD pattern showed that only the CaMgSi2O6 phase was observed in synthesized 0.025Eu2+-doped CaMgSi2O6 powder. Room-temperature photoluminescence excitation (PLE) and photoluminescence (PL) spectra of Eu-CaMgSi2O6 phosphors were recorded by using the Hitachi F-4500 fluorescence spectrophotometer at wavelength ranges of 200–430 and 350–600 nm, respectively. A new important finding is that the synthesized Eu-CaMgSi2O6 phosphor has three important PLE wavelengths. Therefore, Eu-CaMgSi2O6 phosphors are measured from 25oC (room temperature) to 200oC under three different PLE wavelengths to find the effect of temperature on the variations of maximum photoluminescence intensities (PLmax). All the PL spectra show that only one emission band with a central wavelength of 449 nm is found, which is independent of the PLE wavelengths and is caused by the transition of 4f7 → 4f65d1. Another important finding is that the different PLE wavelengths have an apparent effect on the PLmax value of the Eu-CaMgSi2O6 phosphor. Finally, the decay-time curves of Eu-CaMgSi2O6 phosphor under three PLE wavelengths are also investigated.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88932719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.35745/afm2022v02.03.0003
Yi Liu, T. He, Sufen Wei
β-Ga2O3 thin films were prepared on (0006) sapphire substrates by RF magnetron sputtering. Under the conditions of sputtering power of 80 W, time of 10 min, and total flow rate of 40 sccm in oxygen and argon atmosphere (2.5 % oxygen ratio). Different preparation temperatures were used to conduct layering by temperature modulation. A homogenous β-Ga2O3 buffer layer was grown first, and then the second β-Ga2O3 film was grown on top of it. When the stratified sputtering of different temperature combinations was completed, high-temperature thermal annealing with the same parameters was performed. The effects on the structure, surface morphology, and optical properties of β-Ga2O3 thin films were compared and analyzed when using the preparation sequence of the homogenous buffer layer and the top layer at different temperatures after annealing. Finally, based on the stratified preparation temperature parameters, the optimal stratified temperature parameters were summarized.
{"title":"Study on Preparing β-Ga2O3 Films with Temperature-Controlled Buffer Layer by RF Magnetron Sputtering","authors":"Yi Liu, T. He, Sufen Wei","doi":"10.35745/afm2022v02.03.0003","DOIUrl":"https://doi.org/10.35745/afm2022v02.03.0003","url":null,"abstract":"β-Ga2O3 thin films were prepared on (0006) sapphire substrates by RF magnetron sputtering. Under the conditions of sputtering power of 80 W, time of 10 min, and total flow rate of 40 sccm in oxygen and argon atmosphere (2.5 % oxygen ratio). Different preparation temperatures were used to conduct layering by temperature modulation. A homogenous β-Ga2O3 buffer layer was grown first, and then the second β-Ga2O3 film was grown on top of it. When the stratified sputtering of different temperature combinations was completed, high-temperature thermal annealing with the same parameters was performed. The effects on the structure, surface morphology, and optical properties of β-Ga2O3 thin films were compared and analyzed when using the preparation sequence of the homogenous buffer layer and the top layer at different temperatures after annealing. Finally, based on the stratified preparation temperature parameters, the optimal stratified temperature parameters were summarized.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77628899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.35745/afm2022v02.03.0001
Fatima Al Zohbi, F. Ghamouss, B. Schmaltz, M. Abarbri, K. Cherry, Mohamad fadel Tabcheh, F. Tran Van
Non-substituted imidazolium-based protic ionic liquid, namely imidazolium hydrogen sulfate [Imi][HSO4], has been investigated as a polymerization medium for PANI (designated as PANI/PIL). The resulting material was then investigated as electrode materials for supercapacitors. [Imi][HSO4] was prepared via a one-step acid-base reaction, and its structure was confirmed by 1H NMR. [Imi][HSO4] displayed full miscibility with water owing to the charge density distribution of its ions. Furthermore, the binary mixture [Imi][HSO4]/water is highly acid (e.g. pH ~ 0.1 for [Imi][HSO4]/water in a weight ratio of 70/30). As the polymerization medium for PANI/PIL, [Imi][HSO4] plays the role of a soft template agent and induces nanostructured PANI formation with fibrillar morphology (as shown by SEM images) without affecting the typical structure of PANI (as confirmed by FT-IR analysis). Furthermore, PANI/PIL was obtained in emeraldine salt form without any undesirable byproduct. Moreover, the electrical conductivity was seven times superior to that of the conventional PANI (i.e. PANI/HCl) when measured by the four-probe technique of PANI/PIL (~ 21.8 S/cm). This improvement in the PANI/PIL’s electrical conductivity of as well as the fibrillar morphology of PANI/PIL positively influences its electrochemical performances and highlights the suitability of [Imi][HSO4] as a polymerization medium for PANI material.
{"title":"Nanostructuring Polyaniline Using Non-Substituted Imidazolium-Based Ionic liquid as Polymerization Medium Enabling Faster Supercapacitor Operation","authors":"Fatima Al Zohbi, F. Ghamouss, B. Schmaltz, M. Abarbri, K. Cherry, Mohamad fadel Tabcheh, F. Tran Van","doi":"10.35745/afm2022v02.03.0001","DOIUrl":"https://doi.org/10.35745/afm2022v02.03.0001","url":null,"abstract":"Non-substituted imidazolium-based protic ionic liquid, namely imidazolium hydrogen sulfate [Imi][HSO4], has been investigated as a polymerization medium for PANI (designated as PANI/PIL). The resulting material was then investigated as electrode materials for supercapacitors. [Imi][HSO4] was prepared via a one-step acid-base reaction, and its structure was confirmed by 1H NMR. [Imi][HSO4] displayed full miscibility with water owing to the charge density distribution of its ions. Furthermore, the binary mixture [Imi][HSO4]/water is highly acid (e.g. pH ~ 0.1 for [Imi][HSO4]/water in a weight ratio of 70/30). As the polymerization medium for PANI/PIL, [Imi][HSO4] plays the role of a soft template agent and induces nanostructured PANI formation with fibrillar morphology (as shown by SEM images) without affecting the typical structure of PANI (as confirmed by FT-IR analysis). Furthermore, PANI/PIL was obtained in emeraldine salt form without any undesirable byproduct. Moreover, the electrical conductivity was seven times superior to that of the conventional PANI (i.e. PANI/HCl) when measured by the four-probe technique of PANI/PIL (~ 21.8 S/cm). This improvement in the PANI/PIL’s electrical conductivity of as well as the fibrillar morphology of PANI/PIL positively influences its electrochemical performances and highlights the suitability of [Imi][HSO4] as a polymerization medium for PANI material.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87269246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.35745/afm2022v02.03.0002
Evangelos Ximinis, Maria Tsiafitsa, O. Naka, D. Dionysopoulos
Smile reconstruction is, yet, a challenging procedure for dental practitioners. A stable and satisfactory aesthetic result demands a meticulous procedure, which involves many clinical and laboratory steps. The purpose of this article is to present a case of aesthetic reconstruction in the anterior region with a successful 14-year recall. A 40-year-old female patient came to the dental clinic complaining about her smile appearance. Lithium disilicate glass-ceramic full-coverage restorations for the six upper anterior teeth were the selected treatment plan for this case. The key to this successful result was the used therapeutic methodology, where the characteristics of the provisional restorations were copied to the final restorations. In this article, the therapeutic methodology is presented step by step and all the clinical and laboratory steps are explained thoroughly. The patient has visited the dental clinic annually as arecall visit. The final result from the 14-year recall visit revealed that the aesthetic result was stable, the restorations were intact and there were no signs of gingival infection or dental decay. Consequently, the presented therapeutic methodology leads to a successful and long-term result.
{"title":"Clinical Significance of Accurate Transfer of Provisional Resin-Based to Permanent Lithium Disilicate Glass Ceramic Dental Restorations","authors":"Evangelos Ximinis, Maria Tsiafitsa, O. Naka, D. Dionysopoulos","doi":"10.35745/afm2022v02.03.0002","DOIUrl":"https://doi.org/10.35745/afm2022v02.03.0002","url":null,"abstract":"Smile reconstruction is, yet, a challenging procedure for dental practitioners. A stable and satisfactory aesthetic result demands a meticulous procedure, which involves many clinical and laboratory steps. The purpose of this article is to present a case of aesthetic reconstruction in the anterior region with a successful 14-year recall. A 40-year-old female patient came to the dental clinic complaining about her smile appearance. Lithium disilicate glass-ceramic full-coverage restorations for the six upper anterior teeth were the selected treatment plan for this case. The key to this successful result was the used therapeutic methodology, where the characteristics of the provisional restorations were copied to the final restorations. In this article, the therapeutic methodology is presented step by step and all the clinical and laboratory steps are explained thoroughly. The patient has visited the dental clinic annually as arecall visit. The final result from the 14-year recall visit revealed that the aesthetic result was stable, the restorations were intact and there were no signs of gingival infection or dental decay. Consequently, the presented therapeutic methodology leads to a successful and long-term result.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86663065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.35745/afm2022v02.03.0006
Arumugam Parasuraman Arumugam, Govindan Elango, S. Guhanathan
Cobalt (Co) complexes with the N2O2 category have been created synthetically by the reaction of salicylaldehyde / 3,4-diamino benzophenone with acetylacetone and glutaric anhydride respectively. The ligands and individual Cobalt (II) complexes were recognized through spectroscopical data (Fourier Transform Infrared, Ultra Violet-visible, proton and carbon-13 NMR, & Mass). Non-electrolytic in nature of the complex found from their molar conductivities (Ω-1cm2mol-1) in DMSO of 10-3M solution. The ESR revealed the geometry of the complexes to be octahedral. The Schiff base Cobalt (II) complex was characterized by anticancer activity and cytotoxicity
{"title":"Novel Schiff Base Co(II) Complexes: Potential Biological Applications","authors":"Arumugam Parasuraman Arumugam, Govindan Elango, S. Guhanathan","doi":"10.35745/afm2022v02.03.0006","DOIUrl":"https://doi.org/10.35745/afm2022v02.03.0006","url":null,"abstract":"Cobalt (Co) complexes with the N2O2 category have been created synthetically by the reaction of salicylaldehyde / 3,4-diamino benzophenone with acetylacetone and glutaric anhydride respectively. The ligands and individual Cobalt (II) complexes were recognized through spectroscopical data (Fourier Transform Infrared, Ultra Violet-visible, proton and carbon-13 NMR, & Mass). Non-electrolytic in nature of the complex found from their molar conductivities (Ω-1cm2mol-1) in DMSO of 10-3M solution. The ESR revealed the geometry of the complexes to be octahedral. The Schiff base Cobalt (II) complex was characterized by anticancer activity and cytotoxicity","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83774558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-30DOI: 10.35745/afm2022v02.02.0003
Yi-Tzu Tseng, Y. Tseng, C. Wu
Perovskite solar cells have attracted extensive research attention recently as they are promising high-performance solar cells with long-time stability at a low cost. In this study, we demonstrated a one-step solution approach to prepare the CH3NH3PbICl2 perovskite layer by adding lead chloride (PbCl2) to the standard methylamine iodide (MAI) precursor solution and annealing process of the perovskite layer at different temperature. Finally, the Ag/Spiro-OMeTAD/CH3NH3PbI2Cl /mp-TiO2/c-TiO2/FTO/Glass perovskite solar cell was successfully fabricated by using solution processing.
{"title":"Photovoltaic Performance of CH3NH3PbI2Cl Perovskite Solar Cell","authors":"Yi-Tzu Tseng, Y. Tseng, C. Wu","doi":"10.35745/afm2022v02.02.0003","DOIUrl":"https://doi.org/10.35745/afm2022v02.02.0003","url":null,"abstract":"Perovskite solar cells have attracted extensive research attention recently as they are promising high-performance solar cells with long-time stability at a low cost. In this study, we demonstrated a one-step solution approach to prepare the CH3NH3PbICl2 perovskite layer by adding lead chloride (PbCl2) to the standard methylamine iodide (MAI) precursor solution and annealing process of the perovskite layer at different temperature. Finally, the Ag/Spiro-OMeTAD/CH3NH3PbI2Cl /mp-TiO2/c-TiO2/FTO/Glass perovskite solar cell was successfully fabricated by using solution processing.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82795784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-30DOI: 10.35745/afm2022v02.02.0006
P. D’yachkov
Deformations of single-walled carbon nanotubes (SWNTs) change their band structure in the nanoelectromechanical systems. In this study, we investigated the response of the electronic structure of chiral and nonchiral SWNTs (8,7), (9,6), (10,5), (7,7), (11,0), (12,0), and (13,0) to twisting and axial tension modes by using the symmetrized linear augmented cylindrical wave technique. We showed that perturbations of the band structures depend on a “family” index p = (n1 − n2)mod 3 (where p = −1, 0 or 1). Twisting the semiconducting (8,7) tubule with p = 1 in the direction of the screw axis is accompanied by the large broadening of minimum gap E11 and narrowing of the second gap E22, while these gaps drastically change in the tubule (10,5) with p = −1. In these tubules, changing the direction of twisting leads to the reversal in direction of the gap shifts. Regardless of the twisting direction, in metallic (7,7) and quasi-metallic (9,6) SWNTs with p = 0, the E11 gap rapidly increases from 0.0 and 0.035 eV to about 1 eV. When twisting the zigzag tubules (13,0) p = 1 and (11,0) p = −1, the gaps E11 equal to about 0.8 eV increase and decrease by several hundredths of eV. On the contrary, the compression and extension of these tubules cause a sharp change in their band structure with approximately a twofold change in the gaps E11 and E22 and inversion in the sequence of the boundary bands. The similar deformation of the armchair nanotube (7,7) has practically no effect on its electronic levels. In the case of zigzag (12,0) p = 0 SWNT, all deformation modes transform the quasi-metallic tubule into the semiconductor.
{"title":"Electromechanical Property Calculation of Carbon Nanotubes Using Linear Augmented Cylindrical Wave Method","authors":"P. D’yachkov","doi":"10.35745/afm2022v02.02.0006","DOIUrl":"https://doi.org/10.35745/afm2022v02.02.0006","url":null,"abstract":"Deformations of single-walled carbon nanotubes (SWNTs) change their band structure in the nanoelectromechanical systems. In this study, we investigated the response of the electronic structure of chiral and nonchiral SWNTs (8,7), (9,6), (10,5), (7,7), (11,0), (12,0), and (13,0) to twisting and axial tension modes by using the symmetrized linear augmented cylindrical wave technique. We showed that perturbations of the band structures depend on a “family” index p = (n1 − n2)mod 3 (where p = −1, 0 or 1). Twisting the semiconducting (8,7) tubule with p = 1 in the direction of the screw axis is accompanied by the large broadening of minimum gap E11 and narrowing of the second gap E22, while these gaps drastically change in the tubule (10,5) with p = −1. In these tubules, changing the direction of twisting leads to the reversal in direction of the gap shifts. Regardless of the twisting direction, in metallic (7,7) and quasi-metallic (9,6) SWNTs with p = 0, the E11 gap rapidly increases from 0.0 and 0.035 eV to about 1 eV. When twisting the zigzag tubules (13,0) p = 1 and (11,0) p = −1, the gaps E11 equal to about 0.8 eV increase and decrease by several hundredths of eV. On the contrary, the compression and extension of these tubules cause a sharp change in their band structure with approximately a twofold change in the gaps E11 and E22 and inversion in the sequence of the boundary bands. The similar deformation of the armchair nanotube (7,7) has practically no effect on its electronic levels. In the case of zigzag (12,0) p = 0 SWNT, all deformation modes transform the quasi-metallic tubule into the semiconductor.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85782763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-30DOI: 10.35745/afm2022v02.02.0004
H. R. Dehghanpour
Electromagnetic radiation on the suspension of silver-water nanoparticles was simulated using Maxwell equations and the phenomenological equation of extinction crosssection and application of appropriate boundary conditions for nanoparticles with spherical geometry. The outputs of this simulation (extinction coefficient in different conditions) were compared with previous experimental results. The similarity between the simulation outputs and the experimental results indicates the high degree of reliability of the simulation method to predict the results of situations in which there is no experimental data.
{"title":"Modeling of Optical Characteristics of Silver Nanoparticles—Water Suspension Subject to Electromagnetic Irradiation","authors":"H. R. Dehghanpour","doi":"10.35745/afm2022v02.02.0004","DOIUrl":"https://doi.org/10.35745/afm2022v02.02.0004","url":null,"abstract":"Electromagnetic radiation on the suspension of silver-water nanoparticles was simulated using Maxwell equations and the phenomenological equation of extinction crosssection and application of appropriate boundary conditions for nanoparticles with spherical geometry. The outputs of this simulation (extinction coefficient in different conditions) were compared with previous experimental results. The similarity between the simulation outputs and the experimental results indicates the high degree of reliability of the simulation method to predict the results of situations in which there is no experimental data.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90614365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-30DOI: 10.35745/afm2022v02.02.0002
Saransh Tiwari, Sudhaker Dixit, Ved Kumar, A. Rastogi
The essential distinctions and similarities between the center of gravity, the center of mass, and the centroid of a rigid body in space are illustrated in this article. The use of an acceptable equation for a given configuration of the body situated at any location in a 3-D space is established and used in a composite application in the boiler lever safety valve.
{"title":"Analogy among Center of Gravity, Center of Mass, and Centroid of Rigid body: Analysis of Formula for Their Respective Calculation as per Configuration of Body and Utilization in Composite Application","authors":"Saransh Tiwari, Sudhaker Dixit, Ved Kumar, A. Rastogi","doi":"10.35745/afm2022v02.02.0002","DOIUrl":"https://doi.org/10.35745/afm2022v02.02.0002","url":null,"abstract":"The essential distinctions and similarities between the center of gravity, the center of mass, and the centroid of a rigid body in space are illustrated in this article. The use of an acceptable equation for a given configuration of the body situated at any location in a 3-D space is established and used in a composite application in the boiler lever safety valve.","PeriodicalId":14985,"journal":{"name":"Journal of Applied Biomaterials & Functional Materials","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74990716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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