Pub Date : 2023-08-28DOI: 10.1080/10667857.2023.2247908
M. Prakash, Shobana Sampath, K. Amudha, A. Nadeem, B. Lopes, B. Durga, S. Muthupandian
ABSTRACT The increased use of medicinal plants has raised questions regarding their safety, efficacy, and utility. Since a result, a thorough understanding of plant phytochemical components is essential, since this information will be useful in the development of innovative therapeutic medications. Copper nanoparticles (CuNPs) have received a lot of interest due to their numerous applications. The physical and chemical features of CuNPs influence their uses. In the current study, CuNPs were synthesised utilising the chemical reduction process, with Tinospora cordifolia extract serving as a reducing agent due to their high phenolic and flavonoid content and their antibacterial and anti-inflammatory properties were also assessed. The majority of the absorption peaks found in the T. cordifolia leaves extract can also be found in the FT-IR spectrum of CuNPs, often at the same locations or with just little variations in the peak’s location and intensity. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) found that the particles were generally spherical, with an average particle size of 15 to 70 nm. Their potential as anti-bacterial and antifungal drugs was demonstrated by the antimicrobial activity, they exhibited against S. aureus (18 mm), L. bacillus (22 mm), S. mutans (24 mm), and C. albicans (15 mm). Studies on the anti-inflammatory properties of biologically produced Cu NPs were determined.
{"title":"Eco-friendly green synthesis of copper nanoparticles from Tinospora cordifolia leaves: optical properties with biological evaluation of anti-microbial, anti-inflammatory and anti-oxidant applications","authors":"M. Prakash, Shobana Sampath, K. Amudha, A. Nadeem, B. Lopes, B. Durga, S. Muthupandian","doi":"10.1080/10667857.2023.2247908","DOIUrl":"https://doi.org/10.1080/10667857.2023.2247908","url":null,"abstract":"ABSTRACT The increased use of medicinal plants has raised questions regarding their safety, efficacy, and utility. Since a result, a thorough understanding of plant phytochemical components is essential, since this information will be useful in the development of innovative therapeutic medications. Copper nanoparticles (CuNPs) have received a lot of interest due to their numerous applications. The physical and chemical features of CuNPs influence their uses. In the current study, CuNPs were synthesised utilising the chemical reduction process, with Tinospora cordifolia extract serving as a reducing agent due to their high phenolic and flavonoid content and their antibacterial and anti-inflammatory properties were also assessed. The majority of the absorption peaks found in the T. cordifolia leaves extract can also be found in the FT-IR spectrum of CuNPs, often at the same locations or with just little variations in the peak’s location and intensity. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) found that the particles were generally spherical, with an average particle size of 15 to 70 nm. Their potential as anti-bacterial and antifungal drugs was demonstrated by the antimicrobial activity, they exhibited against S. aureus (18 mm), L. bacillus (22 mm), S. mutans (24 mm), and C. albicans (15 mm). Studies on the anti-inflammatory properties of biologically produced Cu NPs were determined.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"81 2 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73047984","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 : 2023-08-28DOI: 10.1080/10667857.2023.2251293
Myungjae Kim, Hyo-Gyung Kim, Jin-Kyu Lee, Jihoo Kim, Sooah Kyung, J. Kwak, Jiwoong Kim
ABSTRACT In recent years, significant efforts have been devoted towards the development of high-performance cermets with superior hardness and fracture toughness for engineering applications. In this study, a (Ti1-xTMx)C solid solution of a Ni cermet was prepared based on a combination of ab initio calculation and experimental results. The structural stability, mechanical properties, and microstructure of the cermet were investigated. A screening process was conducted using ab initio calculations to determine the optimal composition of (Ti1-xTMx)C (TM = V, Mo, and W) (x = 0–0.3125). The enhancement of the mechanical properties was analysed by calculating the electronic properties of the (Ti1-xTMx)C solid solutions. Additionally, we evaluated the powder morphology, microstructure, and mechanical properties of (Ti1-xTMx)C–20Ni by using experimental methods. The (Ti0.7W0.3)C–20Ni cermet exhibited enhanced hardness and fracture toughness in relation to conventional TiC–Ni cermets. Computational and experimental results indicated that the addition of secondary carbides improved the overall material properties. Graphical abstract
{"title":"Effects of secondary carbide addition on the mechanical properties of (Ti1-xTMx)C-based 20Ni cermets (TM = V, Mo, and W): a study combining ab initio calculation and experimental results","authors":"Myungjae Kim, Hyo-Gyung Kim, Jin-Kyu Lee, Jihoo Kim, Sooah Kyung, J. Kwak, Jiwoong Kim","doi":"10.1080/10667857.2023.2251293","DOIUrl":"https://doi.org/10.1080/10667857.2023.2251293","url":null,"abstract":"ABSTRACT In recent years, significant efforts have been devoted towards the development of high-performance cermets with superior hardness and fracture toughness for engineering applications. In this study, a (Ti1-xTMx)C solid solution of a Ni cermet was prepared based on a combination of ab initio calculation and experimental results. The structural stability, mechanical properties, and microstructure of the cermet were investigated. A screening process was conducted using ab initio calculations to determine the optimal composition of (Ti1-xTMx)C (TM = V, Mo, and W) (x = 0–0.3125). The enhancement of the mechanical properties was analysed by calculating the electronic properties of the (Ti1-xTMx)C solid solutions. Additionally, we evaluated the powder morphology, microstructure, and mechanical properties of (Ti1-xTMx)C–20Ni by using experimental methods. The (Ti0.7W0.3)C–20Ni cermet exhibited enhanced hardness and fracture toughness in relation to conventional TiC–Ni cermets. Computational and experimental results indicated that the addition of secondary carbides improved the overall material properties. Graphical abstract","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"175 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74030321","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 : 2023-07-29DOI: 10.1080/10667857.2023.2238414
Namitha Kedimar, P. Rao, S. A. Rao
ABSTRACT Ionic liquid 1,3-dimethylimidazolium dimethyl phosphate (DIDP) is used as a possible green inhibitor for the corrosion control of 6061 aluminium alloy in 0.25 mol/L HCl is described in the study. Study involved electrochemical methods carried out at various temperatures by changing the concentrations of DIDP. Kinetic and thermodynamic parameters were determined using the Arrhenius rate law and transition state equations, respectively. Physisorption of the inhibitor takes place and the adsorption follows Freundlich isotherm. Surface morphology was studied by scanning electron microscopy (SEM), atomic force microscopy (AFM), and energy-dispersive X-ray analysis (EDAX) techniques. Quantum chemical studies were done by the density functional theory (DFT). The maximum inhibition efficiency of DIDP on 6061 aluminium alloy was about 78% for the concentration of 1000 ppm at 303 K. The mechanistic aspects of DIDP adsorption onto the metal surface were supported by quantum chemical studies. HOMO and LUMO of the optimized structure and quantum chemical descriptors confirmed the adsorption of the inhibitor on the metal surface. Mulliken charge population was used to identify the DIDP molecule’s high electron density region, and Fukui indices confirmed the interaction between metal and inhibitor. GRAPHICAL ABSTRACT
{"title":"Effect of ionic liquid as corrosion inhibitor for 6061 aluminium alloy-(electrochemical and quantum chemical approaches)","authors":"Namitha Kedimar, P. Rao, S. A. Rao","doi":"10.1080/10667857.2023.2238414","DOIUrl":"https://doi.org/10.1080/10667857.2023.2238414","url":null,"abstract":"ABSTRACT Ionic liquid 1,3-dimethylimidazolium dimethyl phosphate (DIDP) is used as a possible green inhibitor for the corrosion control of 6061 aluminium alloy in 0.25 mol/L HCl is described in the study. Study involved electrochemical methods carried out at various temperatures by changing the concentrations of DIDP. Kinetic and thermodynamic parameters were determined using the Arrhenius rate law and transition state equations, respectively. Physisorption of the inhibitor takes place and the adsorption follows Freundlich isotherm. Surface morphology was studied by scanning electron microscopy (SEM), atomic force microscopy (AFM), and energy-dispersive X-ray analysis (EDAX) techniques. Quantum chemical studies were done by the density functional theory (DFT). The maximum inhibition efficiency of DIDP on 6061 aluminium alloy was about 78% for the concentration of 1000 ppm at 303 K. The mechanistic aspects of DIDP adsorption onto the metal surface were supported by quantum chemical studies. HOMO and LUMO of the optimized structure and quantum chemical descriptors confirmed the adsorption of the inhibitor on the metal surface. Mulliken charge population was used to identify the DIDP molecule’s high electron density region, and Fukui indices confirmed the interaction between metal and inhibitor. GRAPHICAL ABSTRACT","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"75 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90824907","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 : 2023-06-18DOI: 10.1080/10667857.2023.2225945
Zhilin Liu, Weilin Zeng, Feiyang Lv, Lianlian Wu, Bin Zhang, Yongshan Hu, Zhiliang Luo
ABSTRACT The Bi2O4/Bi2WO6 composites were synthesized by one step hydrothermal method, which were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FT-IR), photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS) and UV – Vis diffuse reflectance spectroscopy (DRS). The photocatalytic performance of the composite was tested by degrading methyl orange (MO) under visible light irradiation. The results showed that the Bi2O4/Bi2WO6 composites performed better than pure Bi2O4 and Bi2WO6, whose cycle stability was also greatly improved. Among them, S3 sample (Bi2O4:Bi2WO6 = 16:1) could degrade by about 95% methyl orange (MO) within 50 min, and after three cycles the degradation rate could still reach 74%. The enhanced photocatalytic activity and stability was attributed to the formation of heterojunctions. This work provided a promising composite photocatalyst with high performance for organic pollutant degradation. GRAPHICAL ABSTRACT
{"title":"Fabrication of Bi2O4/Bi2WO6 composite for high photocatalytic performance","authors":"Zhilin Liu, Weilin Zeng, Feiyang Lv, Lianlian Wu, Bin Zhang, Yongshan Hu, Zhiliang Luo","doi":"10.1080/10667857.2023.2225945","DOIUrl":"https://doi.org/10.1080/10667857.2023.2225945","url":null,"abstract":"ABSTRACT The Bi2O4/Bi2WO6 composites were synthesized by one step hydrothermal method, which were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FT-IR), photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS) and UV – Vis diffuse reflectance spectroscopy (DRS). The photocatalytic performance of the composite was tested by degrading methyl orange (MO) under visible light irradiation. The results showed that the Bi2O4/Bi2WO6 composites performed better than pure Bi2O4 and Bi2WO6, whose cycle stability was also greatly improved. Among them, S3 sample (Bi2O4:Bi2WO6 = 16:1) could degrade by about 95% methyl orange (MO) within 50 min, and after three cycles the degradation rate could still reach 74%. The enhanced photocatalytic activity and stability was attributed to the formation of heterojunctions. This work provided a promising composite photocatalyst with high performance for organic pollutant degradation. GRAPHICAL ABSTRACT","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"8 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82357379","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 : 2023-06-12DOI: 10.1080/10667857.2023.2223018
Cem Resat Ustundag, M. Piskin
ABSTRACT In this study, Calophyllum inophyllum (CIO) loaded Poly (ε-caprolactone) (PCL) electrospun fibre mats were produced for potential wound healing applications. Physiochemical evaluation and in vitro characterisation of produced mats were evaluated. Average fibre diameters of the mats were determined as 0.9 ± 0.3 μm, 1.2 ± 0.2 μm, 1.3 ± 0.2 μm, and 1.5 ± 0.1 μm for PCL, PCL/CIO−2.5, PCL/CIO−5 and PCL/CIO−7.5, respectively. The contact angle values of the fibre mats were decreased up to 30 ± 5 (°) compared to oil-free PCL fibre mat, indicating improved surface wettability. The incorporation of CIO into fibre mats led to a two-fold increase in the antibacterial activity, as compared to the fibre mats composed of PCL. In vitro cytotoxicity evaluation indicated that all the fibre mats had increased cell viability compared to the control. The findings suggest that CIO-loaded PCL electrospun fibre mats have potential for use in tissue engineering applications.
{"title":"Investigation of electrospun poly (ε-caprolactone) fiber mats loaded with Calophyllum inophyllum essential oil for wound dressing applications: Morphology, drug release and in vitro evaluation","authors":"Cem Resat Ustundag, M. Piskin","doi":"10.1080/10667857.2023.2223018","DOIUrl":"https://doi.org/10.1080/10667857.2023.2223018","url":null,"abstract":"ABSTRACT In this study, Calophyllum inophyllum (CIO) loaded Poly (ε-caprolactone) (PCL) electrospun fibre mats were produced for potential wound healing applications. Physiochemical evaluation and in vitro characterisation of produced mats were evaluated. Average fibre diameters of the mats were determined as 0.9 ± 0.3 μm, 1.2 ± 0.2 μm, 1.3 ± 0.2 μm, and 1.5 ± 0.1 μm for PCL, PCL/CIO−2.5, PCL/CIO−5 and PCL/CIO−7.5, respectively. The contact angle values of the fibre mats were decreased up to 30 ± 5 (°) compared to oil-free PCL fibre mat, indicating improved surface wettability. The incorporation of CIO into fibre mats led to a two-fold increase in the antibacterial activity, as compared to the fibre mats composed of PCL. In vitro cytotoxicity evaluation indicated that all the fibre mats had increased cell viability compared to the control. The findings suggest that CIO-loaded PCL electrospun fibre mats have potential for use in tissue engineering applications.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"1 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88193324","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 : 2023-06-10DOI: 10.1080/10667857.2023.2221548
Jue Zeng, Yuqi Huang, X. Yang, Bingxing Wang, Bin Wang
ABSTRACT Cold-rolled Inconel 718 with δ phase dispersion distribution was prepared and exhibited excellent superplasticity at 950°C with a strain rate of 6 × 10−4 ~4 × 10−3 s−1. The elongation to failure of 561% was obtained at a strain rate of 1 × 10−3 s−1. Superplastic deformation accelerates the recrystallization of cold-rolled deformed microstructure, thus improving grain uniformity. The dispersed δ phase promotes the nucleation of recrystallized grains and pin grain boundaries to limit grain size. Diffusion-coordinated grain boundary slip is the main deformation mechanism of the alloy sheet during superplastic stretching. The dense dislocations in the deformed grains act as the channel of atomic diffusion in the early deformation stage. Subsequently, the material conversion between grain boundaries promotes atomic diffusion. The present results have certain reference significance for preparing and forming superplastic Inconel 718 alloy.
{"title":"Study on superplastic behaviour of cold rolled Inconel 718 alloy with δ phase dispersion distribution","authors":"Jue Zeng, Yuqi Huang, X. Yang, Bingxing Wang, Bin Wang","doi":"10.1080/10667857.2023.2221548","DOIUrl":"https://doi.org/10.1080/10667857.2023.2221548","url":null,"abstract":"ABSTRACT Cold-rolled Inconel 718 with δ phase dispersion distribution was prepared and exhibited excellent superplasticity at 950°C with a strain rate of 6 × 10−4 ~4 × 10−3 s−1. The elongation to failure of 561% was obtained at a strain rate of 1 × 10−3 s−1. Superplastic deformation accelerates the recrystallization of cold-rolled deformed microstructure, thus improving grain uniformity. The dispersed δ phase promotes the nucleation of recrystallized grains and pin grain boundaries to limit grain size. Diffusion-coordinated grain boundary slip is the main deformation mechanism of the alloy sheet during superplastic stretching. The dense dislocations in the deformed grains act as the channel of atomic diffusion in the early deformation stage. Subsequently, the material conversion between grain boundaries promotes atomic diffusion. The present results have certain reference significance for preparing and forming superplastic Inconel 718 alloy.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"232 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76564487","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}
ABSTRACT Recurrent eczematous lesions and acute itching describe chronic actinic dermatitis (CAD). Continuous use of corticosteroids might result in a dermal adverse effect. Chitosan (CS)-coated PLGA nanoparticles encapsulated prednisolone (PDS) and co-encapsulated to poloxamer hydrogel to enhance anti-inflammatory action and reduce side effects. The PDS@NPs were synthesized using the solvent-emulsification evaporation method, and their physical and chemical properties were analysed. Ex vivo drug absorption experiment was conducted utilizing the Franz diffusion cells in vitro. Toxic effects on human fibroblasts and keratinocytes were not observed in the nanoparticle formulations. Nanoparticles and hydrogels altered PDS’s release kinetics, but not by the non-encapsulated PDS (NE@PDS). Nanoparticles could not penetrate the stratum corneum of removed the skin, which shows the nano-encapsulation of PDS improved skin absorptions. Pseudoplastic and non-Newtonian behaviour was seen in all hydrogels. The nanoformulations appear to be a promising option for glucocorticoid delivery to individuals with chronic actinic dermatitis (CAD).
{"title":"A convergent synthetic platform of hydrogels enclosing prednisolone-loaded nanoparticles for the treatment of chronic actinic dermatitis","authors":"Quan Chen, Huiyan Deng, Bihua Liang, Run-xiang Li, Huaping Li, Y.-L. Ke, Huilan Zhu","doi":"10.1080/10667857.2023.2219121","DOIUrl":"https://doi.org/10.1080/10667857.2023.2219121","url":null,"abstract":"ABSTRACT Recurrent eczematous lesions and acute itching describe chronic actinic dermatitis (CAD). Continuous use of corticosteroids might result in a dermal adverse effect. Chitosan (CS)-coated PLGA nanoparticles encapsulated prednisolone (PDS) and co-encapsulated to poloxamer hydrogel to enhance anti-inflammatory action and reduce side effects. The PDS@NPs were synthesized using the solvent-emulsification evaporation method, and their physical and chemical properties were analysed. Ex vivo drug absorption experiment was conducted utilizing the Franz diffusion cells in vitro. Toxic effects on human fibroblasts and keratinocytes were not observed in the nanoparticle formulations. Nanoparticles and hydrogels altered PDS’s release kinetics, but not by the non-encapsulated PDS (NE@PDS). Nanoparticles could not penetrate the stratum corneum of removed the skin, which shows the nano-encapsulation of PDS improved skin absorptions. Pseudoplastic and non-Newtonian behaviour was seen in all hydrogels. The nanoformulations appear to be a promising option for glucocorticoid delivery to individuals with chronic actinic dermatitis (CAD).","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"34 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77057621","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 : 2023-06-10DOI: 10.1080/10667857.2023.2221959
A. Maldonado, K. Misra, R. Misra
ABSTRACT Grain boundary (GB) segregation was experimentally studied in a bulk high entropy Cantor alloy, which indicated for the first time that Cr strongly segregates to the GBs along with the weak segregation of Mn, implying co-segregation of Cr and Mn to the GBs. The strong segregation of Cr and weak segregation of Mn are explained in terms of the driving forces for GB segregation, where alloy interaction is favourable and stronger in the case of Cr, while elastic strain energy governs Mn segregation.
{"title":"Grain boundary segregation in a high entropy alloy","authors":"A. Maldonado, K. Misra, R. Misra","doi":"10.1080/10667857.2023.2221959","DOIUrl":"https://doi.org/10.1080/10667857.2023.2221959","url":null,"abstract":"ABSTRACT Grain boundary (GB) segregation was experimentally studied in a bulk high entropy Cantor alloy, which indicated for the first time that Cr strongly segregates to the GBs along with the weak segregation of Mn, implying co-segregation of Cr and Mn to the GBs. The strong segregation of Cr and weak segregation of Mn are explained in terms of the driving forces for GB segregation, where alloy interaction is favourable and stronger in the case of Cr, while elastic strain energy governs Mn segregation.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"67 4","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72464382","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 : 2023-05-30DOI: 10.1080/10667857.2023.2218227
Y. Sun, Z.C. Li, L.F. He, H.P. Li, R.D.K. Misra
Here, we address the continuing challenges and scientific gaps in obtaining high strength and high elongation in medium-Mn steels. Electron microscopy and X-ray diffraction studies clearly underscored that the discontinuous transformation-induced plasticity played a determining role in impacting high strength–toughness combination in conjunction with the microstructural constituents. The discontinuous TRIP effect during deformation involved stress relaxation, which was responsible for high ductility. An excellent combination of a high tensile strength in the range of 1238–1502 MPa and a total elongation of 25–33.6% was obtained when the steels were subjected to an intercritical hardening in the temperature range of 600–750°C and low tempering at 200°C. The intercritical hardening influenced the co-existence of austenite, ferrite and martensite in a manner such that the deformation behaviour varies with the Mn-content.
{"title":"Discontinuous transformation-induced plasticity behaviour in governing the mechanical behaviour in medium-Mn steels","authors":"Y. Sun, Z.C. Li, L.F. He, H.P. Li, R.D.K. Misra","doi":"10.1080/10667857.2023.2218227","DOIUrl":"https://doi.org/10.1080/10667857.2023.2218227","url":null,"abstract":"Here, we address the continuing challenges and scientific gaps in obtaining high strength and high elongation in medium-Mn steels. Electron microscopy and X-ray diffraction studies clearly underscored that the discontinuous transformation-induced plasticity played a determining role in impacting high strength–toughness combination in conjunction with the microstructural constituents. The discontinuous TRIP effect during deformation involved stress relaxation, which was responsible for high ductility. An excellent combination of a high tensile strength in the range of 1238–1502 MPa and a total elongation of 25–33.6% was obtained when the steels were subjected to an intercritical hardening in the temperature range of 600–750°C and low tempering at 200°C. The intercritical hardening influenced the co-existence of austenite, ferrite and martensite in a manner such that the deformation behaviour varies with the Mn-content.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135690373","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}
ABSTRACT Polymethyl methacrylate (PMMA) has been widely used in stomatology to prepare denture bases. However, issues such as a porous structure and high water absorption rate facilitate bacterial growth. This study aimed to synthesize silver nanoparticle/graphene oxide (AgNPs/GO) composites by the chemical reduction method, which was mixed with PMMA by the ball milling method to improve the antibacterial properties of PMMA. Scanning electron microscopy and transmission electron microscopy showed that AgNPs were uniformly dispersed on the GO sheets. AgNPs/GO composite and GO were investigated using x-ray diffraction. The modified AgNPs/GO/PMMA composite demonstrated enhanced antibacterial properties against Streptococcus mutans based on the film adhesion test. Also, the number of bacteria decreased and the morphology of bacteria changed with the increase in mass fraction. Besides, the improved mechanical properties were confirmed by the friction and contact angle tests. Moreover, the composite did not induce cytotoxicity in human gingival mesenchymal stem cells.
{"title":"Effects of silver nanoparticle/graphene oxide composite on the properties of polymethyl methacrylate base material in vitro","authors":"Siqi Tang, Xu Gao, Huanhuan Guo, Yanjin Guan, Meng Lin, Zheng Zheng","doi":"10.1080/10667857.2023.2214025","DOIUrl":"https://doi.org/10.1080/10667857.2023.2214025","url":null,"abstract":"ABSTRACT Polymethyl methacrylate (PMMA) has been widely used in stomatology to prepare denture bases. However, issues such as a porous structure and high water absorption rate facilitate bacterial growth. This study aimed to synthesize silver nanoparticle/graphene oxide (AgNPs/GO) composites by the chemical reduction method, which was mixed with PMMA by the ball milling method to improve the antibacterial properties of PMMA. Scanning electron microscopy and transmission electron microscopy showed that AgNPs were uniformly dispersed on the GO sheets. AgNPs/GO composite and GO were investigated using x-ray diffraction. The modified AgNPs/GO/PMMA composite demonstrated enhanced antibacterial properties against Streptococcus mutans based on the film adhesion test. Also, the number of bacteria decreased and the morphology of bacteria changed with the increase in mass fraction. Besides, the improved mechanical properties were confirmed by the friction and contact angle tests. Moreover, the composite did not induce cytotoxicity in human gingival mesenchymal stem cells.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"33 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81704458","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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