Biodegradable metals as electrodes, interconnectors, and device conductors are essential components in the emergence of transient electronics, either for passive implants or active electronic devices, especially in th...Biodegradable metals as electrodes, interconnectors, and device conductors are essential components in the emergence of transient electronics, either for passive implants or active electronic devices, especially in the fields of biomedical electronics. Magnesium and its alloys are strong candidates for biodegradable and implantable conducting materials because of their high conductivity and biocompatibility, in addition to their well-understood dissolution behavior. One critical drawback of Mg and its alloys is their considerably high dissolution rates originating from their low anodic potential, which disturbs the compatibility to biomedical applications. Herein, we introduce a single-phase thin film of a Mg-Zn binary alloy formed by sputtering, which enhances the corrosion resistance of the device electrode, and verify its applicability in biodegradable electronics. The formation of a homogeneous solid solution of single-phase Mg-3Zn was confirmed through X-ray diffraction and transmission electron microscopy. In addition, the dissolution behavior and chemistry was also investigated in various biological fluids by considering the effect of different ion species. Micro-tensile tests showed that the Mg-3Zn alloy electrode exhibited an enhanced yield strain and elongation in relation to a pure Mg electrode. Cell viability test revealed the high biocompatibility rate of the Mg-3Zn binary alloy thin film. Finally, the fabrication of a wireless heater demonstrated the integrability of biodegradable electrodes and highlighted the ability to prolong the lifecycle of thermotherapy-relevant electronics by enhancing the dissolution resistance of the Mg alloy.展开更多
Polymer blends of cold water soluble starches (amylose or amylopectin soluble starch) with gelatin were prepared using solvent casting method. The solid state miscibility and polymer-polymer interactions between the c...Polymer blends of cold water soluble starches (amylose or amylopectin soluble starch) with gelatin were prepared using solvent casting method. The solid state miscibility and polymer-polymer interactions between the constituent polymers were studied by fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorirmetry (DSC), light optical microscopy (OP) and scanning electron microscopy (SEM), whereas the thermal stability of the blends was studied by thermogravimetric analysis (TGA). Furthermore, tensile and water vapor barrier properties of the blends were assessed. The obtained results exhibited that gelatin was more miscible with amylose soluble starch than with amylopectin soluble starch. Moreover, enhancing mechanical and water barrier properties of amylose soluble starch/gelatin blends were more pronounced than those of amylopectin soluble starch/gelatin blends. Generally, tensile strength (TS) and Elongation percentage (E) of the blend films were found to be gradually increased with increasing the proportion of gelatin. Nevertheless, increasing starch proportion was in favor of decreasing water vapor permeability (WVP). At equal proportions of starch and gelatin (1:1), TS was raised up to 8.69 MPa for amylose soluble starch/gelatin blend films while it raised up to 4.96 MPa for amylopectin soluble starch/gelatin blend films, and so on E was increased to its maximum by ~179.6% for soluble amylose starch/gelatin blends while it was increased to ~114.5% for amylopectin soluble starch/gelatin blends. On the other hand, WVP was significantly decreased to be 6.46 and 12.09 g·mm/m2·day·kPa for blends of amylose and amylopectin soluble?starches, respectively.展开更多
Biodegradable starch/poly (vinyl alcohol)/nano-titanium dioxide (ST/PVA/nano-Ti02) nanocomposite films were prepared via a solution casting method. Their biodegradability, mechanical properties, and thermal proper...Biodegradable starch/poly (vinyl alcohol)/nano-titanium dioxide (ST/PVA/nano-Ti02) nanocomposite films were prepared via a solution casting method. Their biodegradability, mechanical properties, and thermal properties were also studied in this paper. A general full factorial experimental approach was used to determine effective parameters on the mechanical properties of the prepared films. ST/PVA/TiO2 nanocomposites were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results of mechanical analysis show that ST/PVA films with higher contents of PVA have much better mechanical properties. In thermal analysis, it is found that the addition of Ti02 nanoparticles improves the thermal stability of the films. SEM micrographs, taken from the fracture surface of samples, illustrate that the addition of PVA makes the film softer and more flexible. The results of soil burial biodegradation indicate that the biodegradability of ST/PVA/TiO2 films strongly depends on the starch proportion in the film matrix. The degradation rate is increased by the addition of starch in the films.展开更多
Application and promotion of biodegradable plastic film in modern agricultural production construction have become trend and direction of agricultural development.As important production material,biodegradable plastic...Application and promotion of biodegradable plastic film in modern agricultural production construction have become trend and direction of agricultural development.As important production material,biodegradable plastic film not only effectively changes agricultural production mode but also effectively decreases environmental pollution.Accompanied by degradation of new material,upgrading of optimizing process,and infiltration and blending of science and technology in new plastics industry,new biodegradable plastic films have been developed and popularized effectively and rapidly.In this paper,starting from development situation and prospect of degradable plastic film in China,natural-based biodegradable plastics,petroleum-based biodegradable plastics and biological-based biodegradable plastics are introduced in detail from basic material of plastics.The advantages and disadvantages of additive biodegradable film and fully biodegradable film are scientifically analyzed,and seasonal and periodic characteristics of biodegradable plastic film industry are elaborated.Moreover,disadvantages of biodegradable plastic film industry development are explored from technical barrier,brand and channel barriers,and talent barrier.Finally,development trend of biodegradable plastic film industry in China is predicted and analyzed scientifically.The research could provide guidance for the development of biodegradable plastic film industry in China ,research of biodegradable plastic film technology,and demonstration and extension of biodegradable plastic film application.展开更多
The biodegradability of Aspergillus niger (A. niger), Mucor (M-305) and Trichoderma (T-311) strains on regenerated cellulose films in media was investigated. The results showed that T-311 strain isolated from soil adh...The biodegradability of Aspergillus niger (A. niger), Mucor (M-305) and Trichoderma (T-311) strains on regenerated cellulose films in media was investigated. The results showed that T-311 strain isolated from soil adhered on the cellulose film fragments has stronger degradation effect on the cellulose film than A. niger strain. The weights, molecular weights and tensile strengths of the cellulose films in both shake culture and solid media decreased with incubation time, accompanied by producing CO2 and saccharides. HPLC, IR and released CO2 analysis indicated that the biodegradation products of the regenerated cellulose films mainly contain oligosaccharides, cellobiose, glucose, arabinose, erythrose, glycerose, glycerol, ethanal, formaldehyde and organic acid, the end products were CO2 and water. After a month, the films were completely decomposed by fungi in the media at 30 degrees C.展开更多
Indium doped zinc oxide (ZnO:In) thin films were prepared by ultrasonic spray pyrolysis on corning eagle 2000 glass substrate. 1 and 2 at.% indium doped single-layer ZnO:In thin films with different amounts of ace...Indium doped zinc oxide (ZnO:In) thin films were prepared by ultrasonic spray pyrolysis on corning eagle 2000 glass substrate. 1 and 2 at.% indium doped single-layer ZnO:In thin films with different amounts of acetic acid added in the initial solution were fabricated. The 1 at.% indium doped single-layers have triangle grains. The 2 at.% indium doped single-layer with 0.18 acetic acid adding has the resistivity of 6.82 × 10^-3 Ω. cm and particle grains. The doublelayers structure is designed to fabricate the ZnO:In thin film with low resistivity (2.58 × 10^-3 Ω. cm) and good surface morphology. It is found that the surface morphology of the double-layer ZnO:In film strongly depends on the substratelayer, and the second-layer plays a large part in the resistivity of the doublewlayer ZnO:In thin film. Both total and direct transmittances of the double-layer ZnO:In film are above 80% in the visible light region. Single junction a-Si:H solar cell based on the double-layer ZnO:In as front electrode is also investigated.展开更多
Binary biodegradable polymers films, poly(butylene adipate-co-terephthalate)(PBAT) and poly(glycolic acid)(PGA), were prepared through batch melt mixing to obtain Film Ⅰ and Film Ⅱ under two different processing con...Binary biodegradable polymers films, poly(butylene adipate-co-terephthalate)(PBAT) and poly(glycolic acid)(PGA), were prepared through batch melt mixing to obtain Film Ⅰ and Film Ⅱ under two different processing conditions. PGA crystals played a major role in enhancing the mechanical and barrier properties of the films. For Film Ⅰ, there were initial PGA crystals before the film blowing process, the PGA molecular chain further crystallized, forming the oriented crystallization of PGA. Moreover, the Xcand crystalline size in Film Ⅰ were higher than those in Film Ⅱ. Compared with the different processing methods, Film Ⅰ has excellent mechanical and oxygen barrier properties due to the crystallization and orientation. The tensile strength reached 45.0 MPa, and tear strength exceeded 138.2 kN/m, while the elongation at break was as high as 750% for PBAT/PGA 85/15 in Film Ⅰ. The WVTR, WVP coefficients, and OP coefficients of PBAT/PGA films were decreased obviously with increasing the PGA content both in Film Ⅰ and Film Ⅱ. Moreover, the barrier properties of oxygen in Film Ⅰ were better than that in Film Ⅱ. This work reveals a feasible processing technique by introducing of initial crystallization of PGA to blow PBAT/PGA films with excellent mechanical and barrier properties.展开更多
Regenerated cellulose films with water-resistance were obtained by an improved method ofpreparing cellulose cuoxam solution from pulps of agricultural wastes (linters, wheat straw, reedand Bamao). Experimental results...Regenerated cellulose films with water-resistance were obtained by an improved method ofpreparing cellulose cuoxam solution from pulps of agricultural wastes (linters, wheat straw, reedand Bamao). Experimental results showed that the mechanical properties of both the dry. and wetfilms were excellent. Data from IR, SEM and tensile strength measurements implied that thesignificant improvement of water-resistance of the films was due to the cohesion between the thinTung oil covers with hydrophobicity and the regenerated cellulose films. The films werecompletely biodegraded after being buried in soil for 100 days. The transmittance of the filmsderived from linter and reed in visible band range were 80-90%.展开更多
[目的]本研究旨在明确降解膜对农田土壤微生物群落结构特征的影响。[方法]设置4个月降解(4J)、6个月降解(6J)、普通黑膜(PT)3种不同降解膜,以不覆膜为对照(CK),利用高通量测序技术分析土壤细菌群落结构变化,探讨降解膜覆盖农田土壤中微...[目的]本研究旨在明确降解膜对农田土壤微生物群落结构特征的影响。[方法]设置4个月降解(4J)、6个月降解(6J)、普通黑膜(PT)3种不同降解膜,以不覆膜为对照(CK),利用高通量测序技术分析土壤细菌群落结构变化,探讨降解膜覆盖农田土壤中微生物群落的变化及其对微生物生态环境效应的影响。[结果]与不覆膜处理相比,覆膜后土壤中的全氮(PT处理除外)、速效磷、速效钾以及有机质含量均得到了提升。α-蛋白细菌(Alphaproteobacteria)、放线菌(Actinobacteria)、酸杆菌Gp1(Acidobacteria_Gp1)和伽马杆菌(Gammmaproteobacteria)为双季高粱根际土壤中共同优势细菌类群。主季覆膜处理下土壤中放线菌和酸杆菌Gp1和酸杆菌Gp2(Acidobacteria_Gp2)的相对丰度均高于不覆膜的土壤;再生季覆膜处理下土壤Deltaproteobacteria相对丰度均显著高于不覆膜的土壤,且土壤细菌群落OTU(OperationalTaxonomicUnit)数大于2000,具有更高的微生物多样性。通过KEGG代谢途径分析,再生季覆膜处理下土壤中碳水化合物代谢(Carbohydrate metabolism)、氨基酸代谢(Amino acid metabolism)、辅因子和维生素代谢(Me-tabolism of cofactors and vitamins)和萜类化合物和聚酮类化合物代谢(Metabolism of terpenoids and polyketides)高于主季覆膜处理,其中以6J处理较佳。[结论]综上,6个月的降解膜(6J处理)可以有效提升土壤理化性质,改善土壤根际细菌群落生物降解,增加微生物多样性和丰富度。展开更多
基金supported by the Renewable Energy Technology Development (Develop technology to enhance reliability and durability for parts of hydrogen storage tank system) (2022303004020B) grant funded by the Korea Energy Technology Evaluation Planning (KETEP)the Ministry of Science and ICT (Development Project for Emerging Research Instruments Technology),(Project Number: (2022)ERIC)06_1Commercialization Promotion Agency for R&D Outcomes (COMPA)。
文摘Biodegradable metals as electrodes, interconnectors, and device conductors are essential components in the emergence of transient electronics, either for passive implants or active electronic devices, especially in the fields of biomedical electronics. Magnesium and its alloys are strong candidates for biodegradable and implantable conducting materials because of their high conductivity and biocompatibility, in addition to their well-understood dissolution behavior. One critical drawback of Mg and its alloys is their considerably high dissolution rates originating from their low anodic potential, which disturbs the compatibility to biomedical applications. Herein, we introduce a single-phase thin film of a Mg-Zn binary alloy formed by sputtering, which enhances the corrosion resistance of the device electrode, and verify its applicability in biodegradable electronics. The formation of a homogeneous solid solution of single-phase Mg-3Zn was confirmed through X-ray diffraction and transmission electron microscopy. In addition, the dissolution behavior and chemistry was also investigated in various biological fluids by considering the effect of different ion species. Micro-tensile tests showed that the Mg-3Zn alloy electrode exhibited an enhanced yield strain and elongation in relation to a pure Mg electrode. Cell viability test revealed the high biocompatibility rate of the Mg-3Zn binary alloy thin film. Finally, the fabrication of a wireless heater demonstrated the integrability of biodegradable electrodes and highlighted the ability to prolong the lifecycle of thermotherapy-relevant electronics by enhancing the dissolution resistance of the Mg alloy.
文摘Polymer blends of cold water soluble starches (amylose or amylopectin soluble starch) with gelatin were prepared using solvent casting method. The solid state miscibility and polymer-polymer interactions between the constituent polymers were studied by fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorirmetry (DSC), light optical microscopy (OP) and scanning electron microscopy (SEM), whereas the thermal stability of the blends was studied by thermogravimetric analysis (TGA). Furthermore, tensile and water vapor barrier properties of the blends were assessed. The obtained results exhibited that gelatin was more miscible with amylose soluble starch than with amylopectin soluble starch. Moreover, enhancing mechanical and water barrier properties of amylose soluble starch/gelatin blends were more pronounced than those of amylopectin soluble starch/gelatin blends. Generally, tensile strength (TS) and Elongation percentage (E) of the blend films were found to be gradually increased with increasing the proportion of gelatin. Nevertheless, increasing starch proportion was in favor of decreasing water vapor permeability (WVP). At equal proportions of starch and gelatin (1:1), TS was raised up to 8.69 MPa for amylose soluble starch/gelatin blend films while it raised up to 4.96 MPa for amylopectin soluble starch/gelatin blend films, and so on E was increased to its maximum by ~179.6% for soluble amylose starch/gelatin blends while it was increased to ~114.5% for amylopectin soluble starch/gelatin blends. On the other hand, WVP was significantly decreased to be 6.46 and 12.09 g·mm/m2·day·kPa for blends of amylose and amylopectin soluble?starches, respectively.
基金financial support by Iran Nanotechnology Initiative Council
文摘Biodegradable starch/poly (vinyl alcohol)/nano-titanium dioxide (ST/PVA/nano-Ti02) nanocomposite films were prepared via a solution casting method. Their biodegradability, mechanical properties, and thermal properties were also studied in this paper. A general full factorial experimental approach was used to determine effective parameters on the mechanical properties of the prepared films. ST/PVA/TiO2 nanocomposites were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results of mechanical analysis show that ST/PVA films with higher contents of PVA have much better mechanical properties. In thermal analysis, it is found that the addition of Ti02 nanoparticles improves the thermal stability of the films. SEM micrographs, taken from the fracture surface of samples, illustrate that the addition of PVA makes the film softer and more flexible. The results of soil burial biodegradation indicate that the biodegradability of ST/PVA/TiO2 films strongly depends on the starch proportion in the film matrix. The degradation rate is increased by the addition of starch in the films.
基金Supported by Project from Science and Technology Department of Tibet Autonomous Region[XZ2018ZR G-59(Z)]Project of "Young Scholars in Western China" of Chinese Academy of Sciences——"Assessment on Effects of Environmental-friendly Plastic Film Covering on Growth Indicators of Major Crops and Environment in Tibet at High-altitude Region"
文摘Application and promotion of biodegradable plastic film in modern agricultural production construction have become trend and direction of agricultural development.As important production material,biodegradable plastic film not only effectively changes agricultural production mode but also effectively decreases environmental pollution.Accompanied by degradation of new material,upgrading of optimizing process,and infiltration and blending of science and technology in new plastics industry,new biodegradable plastic films have been developed and popularized effectively and rapidly.In this paper,starting from development situation and prospect of degradable plastic film in China,natural-based biodegradable plastics,petroleum-based biodegradable plastics and biological-based biodegradable plastics are introduced in detail from basic material of plastics.The advantages and disadvantages of additive biodegradable film and fully biodegradable film are scientifically analyzed,and seasonal and periodic characteristics of biodegradable plastic film industry are elaborated.Moreover,disadvantages of biodegradable plastic film industry development are explored from technical barrier,brand and channel barriers,and talent barrier.Finally,development trend of biodegradable plastic film industry in China is predicted and analyzed scientifically.The research could provide guidance for the development of biodegradable plastic film industry in China ,research of biodegradable plastic film technology,and demonstration and extension of biodegradable plastic film application.
基金The work ws supported by the State Economy and Trade Commission of China.
文摘The biodegradability of Aspergillus niger (A. niger), Mucor (M-305) and Trichoderma (T-311) strains on regenerated cellulose films in media was investigated. The results showed that T-311 strain isolated from soil adhered on the cellulose film fragments has stronger degradation effect on the cellulose film than A. niger strain. The weights, molecular weights and tensile strengths of the cellulose films in both shake culture and solid media decreased with incubation time, accompanied by producing CO2 and saccharides. HPLC, IR and released CO2 analysis indicated that the biodegradation products of the regenerated cellulose films mainly contain oligosaccharides, cellobiose, glucose, arabinose, erythrose, glycerose, glycerol, ethanal, formaldehyde and organic acid, the end products were CO2 and water. After a month, the films were completely decomposed by fungi in the media at 30 degrees C.
基金supported by Hi-Tech Research and Development Program of China (Grant Nos. 2007AA05Z436 and 2009AA050602)Science and Technology Support Project of Tianjin (Grant No. 08ZCKFGX03500)+3 种基金the National Basic Research Program of China (Grant Nos. 2011CB201605 and 2011CB201606)the National Natural Science Foundation of China (Grant No. 60976051)International Cooperation Project between China-Greece Government (Grant No. 2009DFA62580)Program for New Century Excellent Talents in University of China (Grant No. NCET-08-0295)
文摘Indium doped zinc oxide (ZnO:In) thin films were prepared by ultrasonic spray pyrolysis on corning eagle 2000 glass substrate. 1 and 2 at.% indium doped single-layer ZnO:In thin films with different amounts of acetic acid added in the initial solution were fabricated. The 1 at.% indium doped single-layers have triangle grains. The 2 at.% indium doped single-layer with 0.18 acetic acid adding has the resistivity of 6.82 × 10^-3 Ω. cm and particle grains. The doublelayers structure is designed to fabricate the ZnO:In thin film with low resistivity (2.58 × 10^-3 Ω. cm) and good surface morphology. It is found that the surface morphology of the double-layer ZnO:In film strongly depends on the substratelayer, and the second-layer plays a large part in the resistivity of the doublewlayer ZnO:In thin film. Both total and direct transmittances of the double-layer ZnO:In film are above 80% in the visible light region. Single junction a-Si:H solar cell based on the double-layer ZnO:In as front electrode is also investigated.
基金supported by the Science and Technology Development Plan of Jilin Province(Nos.20210203199SF and 20210509017RQ)the Science and Technology Development Program of Yantai of China(No.2022ZDCX015)+2 种基金the Chinese Academy of Sciences(Changchun Branch)(Nos.2021SYHZ0044 and 2021SYHZ0042)Science and Technology Bureau of Changchun City of China(Nos.21SH13 and 21KY01)Development and Reform commission of Jilin Province of China(No.2021C039-2).
文摘Binary biodegradable polymers films, poly(butylene adipate-co-terephthalate)(PBAT) and poly(glycolic acid)(PGA), were prepared through batch melt mixing to obtain Film Ⅰ and Film Ⅱ under two different processing conditions. PGA crystals played a major role in enhancing the mechanical and barrier properties of the films. For Film Ⅰ, there were initial PGA crystals before the film blowing process, the PGA molecular chain further crystallized, forming the oriented crystallization of PGA. Moreover, the Xcand crystalline size in Film Ⅰ were higher than those in Film Ⅱ. Compared with the different processing methods, Film Ⅰ has excellent mechanical and oxygen barrier properties due to the crystallization and orientation. The tensile strength reached 45.0 MPa, and tear strength exceeded 138.2 kN/m, while the elongation at break was as high as 750% for PBAT/PGA 85/15 in Film Ⅰ. The WVTR, WVP coefficients, and OP coefficients of PBAT/PGA films were decreased obviously with increasing the PGA content both in Film Ⅰ and Film Ⅱ. Moreover, the barrier properties of oxygen in Film Ⅰ were better than that in Film Ⅱ. This work reveals a feasible processing technique by introducing of initial crystallization of PGA to blow PBAT/PGA films with excellent mechanical and barrier properties.
文摘Regenerated cellulose films with water-resistance were obtained by an improved method ofpreparing cellulose cuoxam solution from pulps of agricultural wastes (linters, wheat straw, reedand Bamao). Experimental results showed that the mechanical properties of both the dry. and wetfilms were excellent. Data from IR, SEM and tensile strength measurements implied that thesignificant improvement of water-resistance of the films was due to the cohesion between the thinTung oil covers with hydrophobicity and the regenerated cellulose films. The films werecompletely biodegraded after being buried in soil for 100 days. The transmittance of the filmsderived from linter and reed in visible band range were 80-90%.
文摘[目的]本研究旨在明确降解膜对农田土壤微生物群落结构特征的影响。[方法]设置4个月降解(4J)、6个月降解(6J)、普通黑膜(PT)3种不同降解膜,以不覆膜为对照(CK),利用高通量测序技术分析土壤细菌群落结构变化,探讨降解膜覆盖农田土壤中微生物群落的变化及其对微生物生态环境效应的影响。[结果]与不覆膜处理相比,覆膜后土壤中的全氮(PT处理除外)、速效磷、速效钾以及有机质含量均得到了提升。α-蛋白细菌(Alphaproteobacteria)、放线菌(Actinobacteria)、酸杆菌Gp1(Acidobacteria_Gp1)和伽马杆菌(Gammmaproteobacteria)为双季高粱根际土壤中共同优势细菌类群。主季覆膜处理下土壤中放线菌和酸杆菌Gp1和酸杆菌Gp2(Acidobacteria_Gp2)的相对丰度均高于不覆膜的土壤;再生季覆膜处理下土壤Deltaproteobacteria相对丰度均显著高于不覆膜的土壤,且土壤细菌群落OTU(OperationalTaxonomicUnit)数大于2000,具有更高的微生物多样性。通过KEGG代谢途径分析,再生季覆膜处理下土壤中碳水化合物代谢(Carbohydrate metabolism)、氨基酸代谢(Amino acid metabolism)、辅因子和维生素代谢(Me-tabolism of cofactors and vitamins)和萜类化合物和聚酮类化合物代谢(Metabolism of terpenoids and polyketides)高于主季覆膜处理,其中以6J处理较佳。[结论]综上,6个月的降解膜(6J处理)可以有效提升土壤理化性质,改善土壤根际细菌群落生物降解,增加微生物多样性和丰富度。