The in situ synthesis of TiO_(2)semiconductor photocatalysts using Ti_(3)C_(2)MXene materials offers a highly effective approach to mitigate environmental and energy challenges by selectively reducing CO_(2)to valuabl...The in situ synthesis of TiO_(2)semiconductor photocatalysts using Ti_(3)C_(2)MXene materials offers a highly effective approach to mitigate environmental and energy challenges by selectively reducing CO_(2)to valuable chemicals like CH_(4).However,the transformation of Ti_(3)C_(2)into TiO_(2)is usually accompanied by severe agglomeration of particles,which leads to a reduction in the number of intrinsic active sites,adversely affecting the adsorption and conversion of CO_(2).To address this problem,polymethyl methacrylate(PMMA)was employed as a hard template to fabricate a bowl-shaped TiO_(2)supported on carbon layer(TiO_(2)/C)hybrid photocatalyst by a calcination method.The results showed that the obtained sample had a sufficiently large specific surface area and numerous active sites for CO_(2)adsorption and activation.The excellent conductivity of the carbon layer facilitated the separation of photogenerated carriers produced by TiO_(2),enabling the obtained TiO_(2)/C complexes exhibit CO_(2)reduction rates to CO and CH_(4)of 1.84μmol‧g^(−1)‧h^(−1)and 5.32μmol‧g^(−1)‧h^(−1),respectively,with the CH_(4)selectivity of 74%.The precise utilization of templates to refine the morphology of MXene oxidation products was thus demostrated,offering a practical approach for the application of MXene in the photocatalysis.展开更多
The paper investigated the physical properties of muga silk.Surface properties,linear density,moisture regain and mechanical properties of muga silk were tested before and after degumming.The results show that muga si...The paper investigated the physical properties of muga silk.Surface properties,linear density,moisture regain and mechanical properties of muga silk were tested before and after degumming.The results show that muga silk has tiny fineness and high strength.The average fineness and the strength of the monofilament are 1.52 dtex and 5.62 cN/dtex,respectively.This makes up for the shortcomings of other kinds of silk,and has great potential in the application of biomaterials.展开更多
Textile vascular grafts are often used to treat the cardiovascular diseases.Scholars continue to search for new materials for the development of vascular grafts with excellent properties,polyimide(PI)fiber is a materi...Textile vascular grafts are often used to treat the cardiovascular diseases.Scholars continue to search for new materials for the development of vascular grafts with excellent properties,polyimide(PI)fiber is a material suitable for making vascular grafts with high strength,radiation resistance and stable property,as well as non-cytotoxic and satisfying blood compatibility.This study investigated the tensile strength and hydrolytic degradation properties of PI,polyester(PET)and nylon(PA).The results suggested that the PI is suitable for preparing vascular grafts.And influences of different weaves and ratios of warp and weft density on the water permeability,thickness and porosity of PI vascular grafts were analyzed.Vascular grafts with six weaves and two ratios of warp and weft density were designed and prepared.The surface morphology,permeability and thickness were characterized to optimize the structure of the vascular grafts.The results showed that the wall thickness of all the samples is less than 100μm except for the sample with the ratio 2∶3 and 1/3 twill pattern.Permeability is mainly determined by the weave and the ratio of warp and weft density.The samples in plain weave have the lowest water permeability compared with other samples.展开更多
In order to explore the feasibility of tungsten filament as biomedical metal material,this article conducted a series of performance tests on two different thicknesses of black tungsten filament and two different thic...In order to explore the feasibility of tungsten filament as biomedical metal material,this article conducted a series of performance tests on two different thicknesses of black tungsten filament and two different thicknesses of white tungsten filament.It mainly tested the basic physical properties of the tungsten filament including the longitudinal cross-section of the fiber,the fiber diameter,the mechanical properties of the fiber and the biodegradability,and analyzed the results.The results showed that the breaking force of tungsten filament was about 3000MPa.And whether it was black tungsten filament or white tungsten filament,the larger the diameter,the greater the breaking force,and the breaking strength of the tungsten filament was much larger than the breaking strength of the steel wire.The larger the diameter of the tungsten filament,the slower the degradation rate.During the two months,the mass loss rate of the thick black tungsten filament was 59.40%,thin black tungsten filament was 83.88%,thick white tungsten filament was 47.39%,thin white tungsten filament was 72.29%,the degradation rate of thick tungsten wire was nearly half of the thin,and degradation mainly occured in the first months.展开更多
The paper designed a bionic woven tracheal stent and the stent was a multi-layer tubular structure with a transverse pipeline.Polydioxanone( PDO) monofilament and β-hydroxybutyrate and β-hydroxyvalerate copolymers/p...The paper designed a bionic woven tracheal stent and the stent was a multi-layer tubular structure with a transverse pipeline.Polydioxanone( PDO) monofilament and β-hydroxybutyrate and β-hydroxyvalerate copolymers/polylactic( PHBV/PLA) multifilament were chosen as the tissue engineering tracheal stent materials,and chitosan was chosen as the coating material. This study selected appropriate basic fabric structures and prepared the tracheal stent by setting reasonable weaving parameters,then treated the sample with coating and heat setting. Radical compression performances of the horizontal pipeline and longitudinal pipeline of this tracheal stent were investigated,and the experimental results showed that the stent had good performance on radial supporting force and elastic recovery,which meant it could supply adequate supports for cell growth and tissue regeneration of tracheal lesions; the horizontal pipeline could provide a good experimental foundation for reconstruction of the cartilage ring.展开更多
文摘The in situ synthesis of TiO_(2)semiconductor photocatalysts using Ti_(3)C_(2)MXene materials offers a highly effective approach to mitigate environmental and energy challenges by selectively reducing CO_(2)to valuable chemicals like CH_(4).However,the transformation of Ti_(3)C_(2)into TiO_(2)is usually accompanied by severe agglomeration of particles,which leads to a reduction in the number of intrinsic active sites,adversely affecting the adsorption and conversion of CO_(2).To address this problem,polymethyl methacrylate(PMMA)was employed as a hard template to fabricate a bowl-shaped TiO_(2)supported on carbon layer(TiO_(2)/C)hybrid photocatalyst by a calcination method.The results showed that the obtained sample had a sufficiently large specific surface area and numerous active sites for CO_(2)adsorption and activation.The excellent conductivity of the carbon layer facilitated the separation of photogenerated carriers produced by TiO_(2),enabling the obtained TiO_(2)/C complexes exhibit CO_(2)reduction rates to CO and CH_(4)of 1.84μmol‧g^(−1)‧h^(−1)and 5.32μmol‧g^(−1)‧h^(−1),respectively,with the CH_(4)selectivity of 74%.The precise utilization of templates to refine the morphology of MXene oxidation products was thus demostrated,offering a practical approach for the application of MXene in the photocatalysis.
基金Fundamental Research Funds for the Central Universities,China(No.2232019G-06)
文摘The paper investigated the physical properties of muga silk.Surface properties,linear density,moisture regain and mechanical properties of muga silk were tested before and after degumming.The results show that muga silk has tiny fineness and high strength.The average fineness and the strength of the monofilament are 1.52 dtex and 5.62 cN/dtex,respectively.This makes up for the shortcomings of other kinds of silk,and has great potential in the application of biomaterials.
基金Fundamental Research Funds of Central Universities,China(No.2232019G-06)。
文摘Textile vascular grafts are often used to treat the cardiovascular diseases.Scholars continue to search for new materials for the development of vascular grafts with excellent properties,polyimide(PI)fiber is a material suitable for making vascular grafts with high strength,radiation resistance and stable property,as well as non-cytotoxic and satisfying blood compatibility.This study investigated the tensile strength and hydrolytic degradation properties of PI,polyester(PET)and nylon(PA).The results suggested that the PI is suitable for preparing vascular grafts.And influences of different weaves and ratios of warp and weft density on the water permeability,thickness and porosity of PI vascular grafts were analyzed.Vascular grafts with six weaves and two ratios of warp and weft density were designed and prepared.The surface morphology,permeability and thickness were characterized to optimize the structure of the vascular grafts.The results showed that the wall thickness of all the samples is less than 100μm except for the sample with the ratio 2∶3 and 1/3 twill pattern.Permeability is mainly determined by the weave and the ratio of warp and weft density.The samples in plain weave have the lowest water permeability compared with other samples.
基金Fundamental Research Funds of Central Universities,China(No.2232019G-06)。
文摘In order to explore the feasibility of tungsten filament as biomedical metal material,this article conducted a series of performance tests on two different thicknesses of black tungsten filament and two different thicknesses of white tungsten filament.It mainly tested the basic physical properties of the tungsten filament including the longitudinal cross-section of the fiber,the fiber diameter,the mechanical properties of the fiber and the biodegradability,and analyzed the results.The results showed that the breaking force of tungsten filament was about 3000MPa.And whether it was black tungsten filament or white tungsten filament,the larger the diameter,the greater the breaking force,and the breaking strength of the tungsten filament was much larger than the breaking strength of the steel wire.The larger the diameter of the tungsten filament,the slower the degradation rate.During the two months,the mass loss rate of the thick black tungsten filament was 59.40%,thin black tungsten filament was 83.88%,thick white tungsten filament was 47.39%,thin white tungsten filament was 72.29%,the degradation rate of thick tungsten wire was nearly half of the thin,and degradation mainly occured in the first months.
基金Biomedical Textile Materials Science and Technology(111 Project),China(No.B07024)National Natural Science Foundation of China(No.H0106)Shanghai Pujiang Program,China(No.2015PJC0002)
文摘The paper designed a bionic woven tracheal stent and the stent was a multi-layer tubular structure with a transverse pipeline.Polydioxanone( PDO) monofilament and β-hydroxybutyrate and β-hydroxyvalerate copolymers/polylactic( PHBV/PLA) multifilament were chosen as the tissue engineering tracheal stent materials,and chitosan was chosen as the coating material. This study selected appropriate basic fabric structures and prepared the tracheal stent by setting reasonable weaving parameters,then treated the sample with coating and heat setting. Radical compression performances of the horizontal pipeline and longitudinal pipeline of this tracheal stent were investigated,and the experimental results showed that the stent had good performance on radial supporting force and elastic recovery,which meant it could supply adequate supports for cell growth and tissue regeneration of tracheal lesions; the horizontal pipeline could provide a good experimental foundation for reconstruction of the cartilage ring.
