Pub Date : 2023-07-19DOI: 10.1557/s43578-023-01101-x
A. John, Apurva M. Shetty, Kshema Salian, Samantha Neha Sequeria, P. R. Sumukh, D. Sukmawati, Gowtham Menon, Shajan Abraham, J. Venkatesan, V. Narayanan
The lives and well-being of individuals have been greatly impacted by bone defects brought on by trauma, tumors, genetic disorders, osteoporosis, etc. Also, in the past few decades, the world's aging population has increased the need for nanotechnology to treat trauma-related bone diseases and tissue damage. To successfully imitate the structures seen in naturally occurring systems, nanoengineered systems can now do so. Hence, much focus and effort have been spent in the last decade on nanotechnology, especially nanomaterials. Ceramic nanomaterials have been widely used in tissue repair and engineering due to their high biocompatibility and reactivity. This review aims to identify and discuss the properties, applications in osteoporosis and bone tissue regeneration, mechanism of action, biocompatibility, drawbacks, and future scopes of a few ceramic nanomaterials, i.e., calcium phosphate, hydroxyapatite, mesoporous silica, and bioactive glass. Images reproduced from sources: Adobe Stock, Wikimedia commons, Vecteezy, and iStock under creative commons (with free-to-reuse permission for noncommercial purposes).
{"title":"Ceramic nanomaterials: Preparation and applications in osteoporosis and bone tissue regeneration","authors":"A. John, Apurva M. Shetty, Kshema Salian, Samantha Neha Sequeria, P. R. Sumukh, D. Sukmawati, Gowtham Menon, Shajan Abraham, J. Venkatesan, V. Narayanan","doi":"10.1557/s43578-023-01101-x","DOIUrl":"https://doi.org/10.1557/s43578-023-01101-x","url":null,"abstract":"The lives and well-being of individuals have been greatly impacted by bone defects brought on by trauma, tumors, genetic disorders, osteoporosis, etc. Also, in the past few decades, the world's aging population has increased the need for nanotechnology to treat trauma-related bone diseases and tissue damage. To successfully imitate the structures seen in naturally occurring systems, nanoengineered systems can now do so. Hence, much focus and effort have been spent in the last decade on nanotechnology, especially nanomaterials. Ceramic nanomaterials have been widely used in tissue repair and engineering due to their high biocompatibility and reactivity. This review aims to identify and discuss the properties, applications in osteoporosis and bone tissue regeneration, mechanism of action, biocompatibility, drawbacks, and future scopes of a few ceramic nanomaterials, i.e., calcium phosphate, hydroxyapatite, mesoporous silica, and bioactive glass. Images reproduced from sources: Adobe Stock, Wikimedia commons, Vecteezy, and iStock under creative commons (with free-to-reuse permission for noncommercial purposes).","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"3 1","pages":"4023 - 4041"},"PeriodicalIF":0.8,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74354825","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 : 2023-07-10DOI: 10.1557/s43578-023-01103-9
Peyman K. Aspoukeh, Azeez Abdullah Barzinjy, S. M. Hamad
ZnO nanorods were synthesized via CBD method on a seed layer coated substrate. Prior to growth, a glass substrate was seeded with the biosynthesized ZnO nanoparticles using Thymus Kotschyanus extract. XRD confirmed that for the sample within higher precursor concentration, the (100) peak is noticeably shorter, and the majority of the nanorods are grown in the (002) plane, indicating crystal growth are along the c-axis. However, the nanorods are mostly aligned along the (100), (002), and (101) planes for samples at 0.02 and 0.05 Mol precursor concentrations. The presence of ZnO nanorods within hexagonal-wurtzite structure, is favored orientation along the c-axis. As the precursor concentrations of the seed layer increased from 0.02 to 0.1 Mol, the dispersion of ZnO nanoparticles became denser, the maximum absorption peaks red-shifted, from 395 to 420 nm, and the bandgap energy of the biosynthesized ZnO decreased from 3.59 to 3.38 eV, with increasing precursor concentrations.
{"title":"The impact of green synthesized seed layer on ZnO nanorod arrays grown by chemical bath deposition","authors":"Peyman K. Aspoukeh, Azeez Abdullah Barzinjy, S. M. Hamad","doi":"10.1557/s43578-023-01103-9","DOIUrl":"https://doi.org/10.1557/s43578-023-01103-9","url":null,"abstract":"ZnO nanorods were synthesized via CBD method on a seed layer coated substrate. Prior to growth, a glass substrate was seeded with the biosynthesized ZnO nanoparticles using Thymus Kotschyanus extract. XRD confirmed that for the sample within higher precursor concentration, the (100) peak is noticeably shorter, and the majority of the nanorods are grown in the (002) plane, indicating crystal growth are along the c-axis. However, the nanorods are mostly aligned along the (100), (002), and (101) planes for samples at 0.02 and 0.05 Mol precursor concentrations. The presence of ZnO nanorods within hexagonal-wurtzite structure, is favored orientation along the c-axis. As the precursor concentrations of the seed layer increased from 0.02 to 0.1 Mol, the dispersion of ZnO nanoparticles became denser, the maximum absorption peaks red-shifted, from 395 to 420 nm, and the bandgap energy of the biosynthesized ZnO decreased from 3.59 to 3.38 eV, with increasing precursor concentrations.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"73 1","pages":"3801 - 3813"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90692894","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 : 2023-07-10DOI: 10.1557/s43578-023-01087-6
R. Chandrapal, J. Raveena, G. Bakiyaraj, S. Bharathkumar, V. Ganesh, J. Archana, M. Navaneethan
Highly effective Z-scheme La–ZnO/GCN nanocomposite (LZG) were synthesized via hydrothermal and ultrasonication methods. The prepared samples were further analyzed through varies techniques like X-ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM), X-ray photoelectron spectroscopy (XPS) and UV–visible spectroscopy. XRD confirms the non-detection of secondary phase formation and decrementing pattern of crystallite size confirm La ions presence in host lattice. Presence of La–ZnO nanorods on nanosheets of GCN are well observed from the HRSEM analysis. Enhancement in pollutant degradation was accredited due to higher charge transfer property observed from EIS (Electrochemical impedance spectroscopy). First-order Langmuir–Hinshelwood relation reveals about the higher rate of reaction (0.01796 × 10–2 min−1), around 84% of TC pollutant degradation by 10-10LZG nanocomposite within the time span of 80 min. The current research supports a novel design of nanocomposite with an electron trapper for hindering charge recombination process and enhancing the degradation of pharmaceutical pollutants.
{"title":"Enhancing the photocatalytic performance of g-C3N4 (GCN) via La–ZnO nanocomposite (Z-scheme mechanism) against toxic pharmaceutical pollutant","authors":"R. Chandrapal, J. Raveena, G. Bakiyaraj, S. Bharathkumar, V. Ganesh, J. Archana, M. Navaneethan","doi":"10.1557/s43578-023-01087-6","DOIUrl":"https://doi.org/10.1557/s43578-023-01087-6","url":null,"abstract":"Highly effective Z-scheme La–ZnO/GCN nanocomposite (LZG) were synthesized via hydrothermal and ultrasonication methods. The prepared samples were further analyzed through varies techniques like X-ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM), X-ray photoelectron spectroscopy (XPS) and UV–visible spectroscopy. XRD confirms the non-detection of secondary phase formation and decrementing pattern of crystallite size confirm La ions presence in host lattice. Presence of La–ZnO nanorods on nanosheets of GCN are well observed from the HRSEM analysis. Enhancement in pollutant degradation was accredited due to higher charge transfer property observed from EIS (Electrochemical impedance spectroscopy). First-order Langmuir–Hinshelwood relation reveals about the higher rate of reaction (0.01796 × 10–2 min−1), around 84% of TC pollutant degradation by 10-10LZG nanocomposite within the time span of 80 min. The current research supports a novel design of nanocomposite with an electron trapper for hindering charge recombination process and enhancing the degradation of pharmaceutical pollutants.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"98 1","pages":"3585 - 3601"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84073238","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 : 2023-07-10DOI: 10.1557/s43578-023-01065-y
Tianyu Zhao, Wei Wu, Jianshuo Li, Xiyun Zhang
In this article, flame retarding PP composite powder composed of commercial pure PP powder, intumescent flame retardant (IFR), and hollow glass microsphere (HGM) suitable for SLS was prepared successfully by mechanical blending, and the corresponding sintering process and flame retardancy were studied. The results showed that the HGM can improve the flowability of PP composite powder effectively and enlarged the sintering window, decreasing the warping phenomenon during printing. The flame-retardant tests showed that there was a synergistic flame-retardant effect between HGM and IFR. The LOI value and UL-94 grade reached 32.1 ± 0.5% and V-0 with the addition of 10 wt% HGM. SEM results showed that HGM improved the quality of char layer. Moreover, HGM could increase thermal stability and decreased the density to 0.712 g/cm3, the tensile strength and the elongation at break could reach 16.7 ± 0.2Mpa and 7.6 ± 0.1%, respectively. A new kind of PP composite powder with high flame retardancy suitable for selective laser sintering (SLS) was prepared successfully by mechanical blending. Hollow glass microsphere (HGM) can effectively enhance the flame retardancy and tensile strength.
{"title":"Effect of hollow glass microsphere on the processing and flame retardancy of intumescent flame retardant polypropylene composites prepared by selective laser sintering","authors":"Tianyu Zhao, Wei Wu, Jianshuo Li, Xiyun Zhang","doi":"10.1557/s43578-023-01065-y","DOIUrl":"https://doi.org/10.1557/s43578-023-01065-y","url":null,"abstract":"In this article, flame retarding PP composite powder composed of commercial pure PP powder, intumescent flame retardant (IFR), and hollow glass microsphere (HGM) suitable for SLS was prepared successfully by mechanical blending, and the corresponding sintering process and flame retardancy were studied. The results showed that the HGM can improve the flowability of PP composite powder effectively and enlarged the sintering window, decreasing the warping phenomenon during printing. The flame-retardant tests showed that there was a synergistic flame-retardant effect between HGM and IFR. The LOI value and UL-94 grade reached 32.1 ± 0.5% and V-0 with the addition of 10 wt% HGM. SEM results showed that HGM improved the quality of char layer. Moreover, HGM could increase thermal stability and decreased the density to 0.712 g/cm3, the tensile strength and the elongation at break could reach 16.7 ± 0.2Mpa and 7.6 ± 0.1%, respectively. A new kind of PP composite powder with high flame retardancy suitable for selective laser sintering (SLS) was prepared successfully by mechanical blending. Hollow glass microsphere (HGM) can effectively enhance the flame retardancy and tensile strength.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"10 1","pages":"3467 - 3477"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75710195","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 : 2023-07-10DOI: 10.1557/s43578-023-01098-3
K. A. Kalhoro, M. Khalid, Kiran Naz, M. S. Akhtar, Muhammad Nadeem, H. Somaily
Sol–gel method has been used to synthesize copper substituted nickel ferrite CuxNi1−xFe2O4 nanoparticles with different concentration of copper as x = 0.0, 0.1, 0.2, 0.3, and 0.4. The crystallinity was confirmed through the powder X-ray diffraction method with single phase face-centred cubic structure for all CuxNi1−xFe2O4 samples having preferred orientation along (311) plane. The crystallite size was estimated through Scherrer’s formula and observed to be in the range from 21 to 38 nm. The microstructure of ferrite nanoparticles was characterized by the scanning electron microscopy. The existence of functional groups and copper substitution in CuxNi1−xFe2O4 nanoparticles was investigated by Fourier transform infrared spectroscopy. Impedance analyser was employed to investigate the dielectric properties of copper substituted nickel ferrites. The high value of dielectric constant at low frequency and low impedance at high frequency would make these nanoparticles a potential candidate for microwave device applications.
{"title":"Sol–gel synthesis and physical properties of Ni–Cu based spinel ferrites nanoparticles","authors":"K. A. Kalhoro, M. Khalid, Kiran Naz, M. S. Akhtar, Muhammad Nadeem, H. Somaily","doi":"10.1557/s43578-023-01098-3","DOIUrl":"https://doi.org/10.1557/s43578-023-01098-3","url":null,"abstract":"Sol–gel method has been used to synthesize copper substituted nickel ferrite CuxNi1−xFe2O4 nanoparticles with different concentration of copper as x = 0.0, 0.1, 0.2, 0.3, and 0.4. The crystallinity was confirmed through the powder X-ray diffraction method with single phase face-centred cubic structure for all CuxNi1−xFe2O4 samples having preferred orientation along (311) plane. The crystallite size was estimated through Scherrer’s formula and observed to be in the range from 21 to 38 nm. The microstructure of ferrite nanoparticles was characterized by the scanning electron microscopy. The existence of functional groups and copper substitution in CuxNi1−xFe2O4 nanoparticles was investigated by Fourier transform infrared spectroscopy. Impedance analyser was employed to investigate the dielectric properties of copper substituted nickel ferrites. The high value of dielectric constant at low frequency and low impedance at high frequency would make these nanoparticles a potential candidate for microwave device applications.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"46 1","pages":"3764 - 3775"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81342127","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 : 2023-07-10DOI: 10.1557/s43578-023-01099-2
B. Arya, R. Choudhary
This paper reports the synthesis and detailed discussion of structural, electrical and leakage current characteristics of strontium stannate-selenite (Sr(Sn,Se)O3) modified bismuth sodium titanate (Bi0.5Na0.5TiO3) compounds with standard formula (1−2x) (Bi0.5Na0.5)TiO3 + x(SrSnO3) + x(SrSeO3) with x = 0, 0.05, 0.10, 0.15. The materials have been fabricated through a mixed oxide reaction route. The room temperature X-ray structural analysis indicates the formation of single-phase compounds with a rhombohedral crystal system. The SEM micrograph suggests the even distributions of grains with a very small number of voids. Detailed studies of frequency (1 kHz to 1 MHz) and temperature (25–500 °C) dependence of dielectric and other electrical parameters of the studied compounds were obtained using the programmable LCR meter. The ferroelectric behavior in the compounds is confirmed by the P–E hysteresis loop. The J–E characteristics of the materials have shown a very small amount of leakage current density with the presence of an Ohmic conduction mechanism.
{"title":"Structural, electrical, and leakage current characteristics of Sr(Sn,Se)O3 modified Bi0.5Na0.5TiO3 ferroelectric ceramics","authors":"B. Arya, R. Choudhary","doi":"10.1557/s43578-023-01099-2","DOIUrl":"https://doi.org/10.1557/s43578-023-01099-2","url":null,"abstract":"This paper reports the synthesis and detailed discussion of structural, electrical and leakage current characteristics of strontium stannate-selenite (Sr(Sn,Se)O3) modified bismuth sodium titanate (Bi0.5Na0.5TiO3) compounds with standard formula (1−2x) (Bi0.5Na0.5)TiO3 + x(SrSnO3) + x(SrSeO3) with x = 0, 0.05, 0.10, 0.15. The materials have been fabricated through a mixed oxide reaction route. The room temperature X-ray structural analysis indicates the formation of single-phase compounds with a rhombohedral crystal system. The SEM micrograph suggests the even distributions of grains with a very small number of voids. Detailed studies of frequency (1 kHz to 1 MHz) and temperature (25–500 °C) dependence of dielectric and other electrical parameters of the studied compounds were obtained using the programmable LCR meter. The ferroelectric behavior in the compounds is confirmed by the P–E hysteresis loop. The J–E characteristics of the materials have shown a very small amount of leakage current density with the presence of an Ohmic conduction mechanism.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"44 1","pages":"3776 - 3790"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81553760","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 : 2023-07-10DOI: 10.1557/s43578-023-01106-6
Tianzong Xu, K. Komvopoulos
Diamond nucleation and growth from submicron clusters consisting of an amorphous carbon phase with predominantly sp3 atomic hybridization and randomly oriented diamond nanocrystallites was investigated by various microanalysis techniques. The carbon clusters were created by exposing a highly sp3 hybridized carbon thin film, deposited on a smooth silicon substrate by a vacuum arc method, to a low-temperature, methane-rich hydrogen plasma in a microwave plasma-enhanced chemical vapor deposition system. Diamond nanocrystallites inside the carbon clusters produced by the pretreatment acted as diamond nucleation sites. Microanalysis results provided insight into the structure and composition of the carbon clusters, the diamond nanocrystallites, and the amorphous ultrathin interlayers at the interfaces of the clusters and the grown diamond film with the silicon substrate. The physical phenomena responsible for the enhancement of diamond nucleation and growth on smooth substrates by the present method are interpreted in the context of the obtained results.
{"title":"Diamond nucleation and growth from submicron amorphous carbon clusters containing randomly oriented diamond nanocrystallites","authors":"Tianzong Xu, K. Komvopoulos","doi":"10.1557/s43578-023-01106-6","DOIUrl":"https://doi.org/10.1557/s43578-023-01106-6","url":null,"abstract":"Diamond nucleation and growth from submicron clusters consisting of an amorphous carbon phase with predominantly sp3 atomic hybridization and randomly oriented diamond nanocrystallites was investigated by various microanalysis techniques. The carbon clusters were created by exposing a highly sp3 hybridized carbon thin film, deposited on a smooth silicon substrate by a vacuum arc method, to a low-temperature, methane-rich hydrogen plasma in a microwave plasma-enhanced chemical vapor deposition system. Diamond nanocrystallites inside the carbon clusters produced by the pretreatment acted as diamond nucleation sites. Microanalysis results provided insight into the structure and composition of the carbon clusters, the diamond nanocrystallites, and the amorphous ultrathin interlayers at the interfaces of the clusters and the grown diamond film with the silicon substrate. The physical phenomena responsible for the enhancement of diamond nucleation and growth on smooth substrates by the present method are interpreted in the context of the obtained results.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"9 1","pages":"3890 - 3900"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85865173","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}
Lightweight flexible composite films are widely used in the field of smart and wearable devices due to efficient electromagnetic interference (EMI) shielding effectiveness in the wide frequency domain and excellent mechanical properties. Herein, the CNTs@MXene composite films with excellent mechanical properties and EMI effectiveness were prepared by electrophoretic deposition method on carbon nanotubes (CNTs) substrate. By optimizing the experimental parameters, the optimal deposition time was determined to be 15 min. Meanwhile, the mechanical properties of the 40 μm composite films were the best and the tensile strength reached about 29.2 MPa. Moreover, the composite films with the same thickness showed excellent electromagnetic shielding effects of 69.02 dB and 77.32 dB in X-band and P-band, respectively. The CNTs@MXene composite films showed excellent EMI shielding effectiveness and mechanical properties. Therefore, the composite films showed great advantages and potentials in the application of smart and wearable devices.
{"title":"Ultrathin, flexible CNTs@MXene film fabricated with electrophoretic deposition method for high-performance electromagnetic interference shielding","authors":"Jinling Tong, Dongxu Yang, X. Liu, Shaowei Lu, Jijie Wang, Boxiong Zheng, Zihan Zhao, Yutong Song","doi":"10.1557/s43578-023-01100-y","DOIUrl":"https://doi.org/10.1557/s43578-023-01100-y","url":null,"abstract":"Lightweight flexible composite films are widely used in the field of smart and wearable devices due to efficient electromagnetic interference (EMI) shielding effectiveness in the wide frequency domain and excellent mechanical properties. Herein, the CNTs@MXene composite films with excellent mechanical properties and EMI effectiveness were prepared by electrophoretic deposition method on carbon nanotubes (CNTs) substrate. By optimizing the experimental parameters, the optimal deposition time was determined to be 15 min. Meanwhile, the mechanical properties of the 40 μm composite films were the best and the tensile strength reached about 29.2 MPa. Moreover, the composite films with the same thickness showed excellent electromagnetic shielding effects of 69.02 dB and 77.32 dB in X-band and P-band, respectively. The CNTs@MXene composite films showed excellent EMI shielding effectiveness and mechanical properties. Therefore, the composite films showed great advantages and potentials in the application of smart and wearable devices.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"26 1","pages":"3791 - 3800"},"PeriodicalIF":0.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80255002","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 : 2023-07-07DOI: 10.1557/s43578-023-01083-w
Binxia Yuan, Zige Luo, Weiling Luan, Lan Cao, Rui Zhu
TiO2 has the characteristics of low cost and good optical stability, but its light absorption range is narrow and its electrons are easy to combine with. The addition of metal nanoparticles can help to improve its charge transfer rate and improve its catalytic performance. In the paper, amorphous TiO2 pore structure was obtained using PVP as a template and then Ag was deposited on the surface of TiO2 through a simple ultraviolet light illumination. With increase of irradiation time, the distribution and deposition state of Ag particles were different. Through the electrochemical test, it was found that the deposition of Ag particles in a-TiO2 decreased impedance and improved the hole–electron pairs’ separation efficiency and carrier concentration. After 15-h irradiation, Ag/a-TiO2 composite can form a uniform Schottky barrier and its photocatalytic hydrogen production effect was the best. The highest hydrogen production rate in 15 h of UV light reached 400.3 μmol g−1 h−1. Finally, the electron transfer mechanism of Ag/a-TiO2 was explained.
{"title":"Effect of UV irradiation on synthesis of Ag/amorphous TiO2 composites with photocatalytic hydrogen production","authors":"Binxia Yuan, Zige Luo, Weiling Luan, Lan Cao, Rui Zhu","doi":"10.1557/s43578-023-01083-w","DOIUrl":"https://doi.org/10.1557/s43578-023-01083-w","url":null,"abstract":"TiO2 has the characteristics of low cost and good optical stability, but its light absorption range is narrow and its electrons are easy to combine with. The addition of metal nanoparticles can help to improve its charge transfer rate and improve its catalytic performance. In the paper, amorphous TiO2 pore structure was obtained using PVP as a template and then Ag was deposited on the surface of TiO2 through a simple ultraviolet light illumination. With increase of irradiation time, the distribution and deposition state of Ag particles were different. Through the electrochemical test, it was found that the deposition of Ag particles in a-TiO2 decreased impedance and improved the hole–electron pairs’ separation efficiency and carrier concentration. After 15-h irradiation, Ag/a-TiO2 composite can form a uniform Schottky barrier and its photocatalytic hydrogen production effect was the best. The highest hydrogen production rate in 15 h of UV light reached 400.3 μmol g−1 h−1. Finally, the electron transfer mechanism of Ag/a-TiO2 was explained.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"77 1","pages":"3628 - 3637"},"PeriodicalIF":0.8,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81161850","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 : 2023-07-07DOI: 10.1557/s43578-023-01107-5
Jingui Yu, C. Han, Faping Yu, C. Dong, Gang Zhao, Caiyun Gong, Mingchao Wang, Qiao-xin Zhang
Molecular dynamics simulation was used to study the tension–compression asymmetry and brittle–ductile transition of Ni–Al metallic glass. We found the cooling rate has little influence on its tension–compression asymmetry. Their mechanical properties depend on the components. When the content of Al element is high, the low content of icosahedral clusters leads to poor mechanical properties. Meanwhile, the tension–compression asymmetry is more obvious with the high aspect ratio, which is positively correlated with the content of icosahedral clusters. Compared with aspect ratio, cooling rate and composition have little effect on brittle–ductile transition. The icosahedral clusters transform from low to high symmetry under tensile and compressive loads, accompanied by irreversible atomic rearrangements near the shear bands, leading to limited plasticity. The rejuvenation rate of icosahedral clusters is faster in metallic glasses with high aspect ratio, leading to brittle fracture, which is the mechanism of brittle–ductile transition behavior of metallic glasses.
{"title":"Icosahedron-dominated tension–compression asymmetry and brittle–ductile transition of metallic glass","authors":"Jingui Yu, C. Han, Faping Yu, C. Dong, Gang Zhao, Caiyun Gong, Mingchao Wang, Qiao-xin Zhang","doi":"10.1557/s43578-023-01107-5","DOIUrl":"https://doi.org/10.1557/s43578-023-01107-5","url":null,"abstract":"Molecular dynamics simulation was used to study the tension–compression asymmetry and brittle–ductile transition of Ni–Al metallic glass. We found the cooling rate has little influence on its tension–compression asymmetry. Their mechanical properties depend on the components. When the content of Al element is high, the low content of icosahedral clusters leads to poor mechanical properties. Meanwhile, the tension–compression asymmetry is more obvious with the high aspect ratio, which is positively correlated with the content of icosahedral clusters. Compared with aspect ratio, cooling rate and composition have little effect on brittle–ductile transition. The icosahedral clusters transform from low to high symmetry under tensile and compressive loads, accompanied by irreversible atomic rearrangements near the shear bands, leading to limited plasticity. The rejuvenation rate of icosahedral clusters is faster in metallic glasses with high aspect ratio, leading to brittle fracture, which is the mechanism of brittle–ductile transition behavior of metallic glasses.","PeriodicalId":14079,"journal":{"name":"International Journal of Materials Research","volume":"21 1","pages":"3901 - 3912"},"PeriodicalIF":0.8,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84659705","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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