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A comprehensive review on metallic biomaterials for airway stenosis repair

Journal of Materials Science & Technology 2023年第21期152卷 148-158页

作者： Huafang Li Wubin Wu Xiwei Liu Cuie Wen School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Lepu Medical Technology Co. LtdBeijing 102200China School of Engineering RMIT UniversityMelbourneVIC 3001Australia

In recent years,the incidence of airway stenosis in respiratory diseases increases year by *** many treatment methods,tracheal stent implantation is a very effective *** stents have been the first choice for tracheal stent implantation due to their excellent mechanical properties,low rate of migration,and minimal effect on the ciliary movement of the *** this paper,the research progress of metal tracheal stents is introduced in detail from three aspects of mechanical properties,degradation properties,and biocompatibility,including traditional inert metallic tracheal stents and new degradable metallic tracheal stents,and its future research and development are prospected:although the current research on biodegradable metal tracheal stents is still in its infancy,with only some studies of magnesium-based,iron-based,and zinc-based tracheal stents,they are considered as the best material for preparing future metal tracheal scaffolds considering their biodegradability and biocompatibility.

关键词： Tracheal stenosis Inert metallic tracheal stent Degradable metallic tracheal stent Biocompatibility degradation properties

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Degradability of biodegradable plastic films and its mulching effects on soil temperature and maize yield in northeastern China

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International Journal of Agricultural and Biological Engineering 2020年第2期13卷 146-153页

作者： Wangwang Zhang Lihong Wang Jiaqi Zhou Kunlun Zhu Shijun Sun College of Water Conservancy Shenyang Agricultural UniversityShenyang 110866China Shandong Tianzhuang Eco-Benign Plastics Technology Co. LtdJinan 250110China

Plastic film is an important resource in agricultural production,but it takes hundreds of years to degrade completely in natural *** large-scale use of plastic film will inevitably lead to serious environmental *** way to solve the problem is to develop a substitutable mulching film,such as a biodegradable film that can ultimately be decomposed to water,carbon dioxide,and soil organic matter by *** this study,a 2-year experiment was conducted to determine the degradation properties of a biodegradable plastic film,including degradation rate,surface microstructure,tensile strength and elongation at break,and the effects of different mulching treatments on soil temperature and maize *** mulching experiment was conducted with three different biodegradable plastic films with different degradation rates,using a common plastic film and a non-mulched treatment as *** the addition of the additives for degradation in the biodegradable plastic films,the degradation rates increased significantly,which were 7.2%-17.8%in 2017 and 18.1%-35.2%in 2018 after maize ***,the degradation occurred mainly on the ridge *** decrease in tensile strength and elongation was proportional to the degradation rate of the degradable *** SEM results indicated that the surface microstructures of the biodegradable films were loose and heterogeneous after maize *** plastic film mulching increased the soil temperature at soil depths of 5 cm,15 cm,and 25 cm,over the maize’s entire growth period,by 3.1℃-3.2℃ in 2017 and 1.2℃-2.1℃ in 2018 compared with the non-mulched *** biodegradable plastic film increased the maize yield by 10.4%-14.3%in 2017 and 11.6%-24.7%in *** soil temperature and maize yield increases were statistically significant;however,with respect to maize qualities,there were no statistically significant increases among the five *** study shows that biodegradable plastic

关键词： biodegradable plastic film film mulching degradation properties soil temperature maize yield

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Packaging and degradability properties of polyvinyl alcohol/gelatin nanocomposite films filled water hyacinth cellulose nanocrystals

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Journal of Bioresources and Bioproducts 2021年第2期6卷 168-185页

作者： Henry C.Oyeoka Chinomso M.Ewulonu Iheoma C.Nwuzor Chizoba M.Obele Joseph T.Nwabanne Department of Polymer and Textile Engineering Nnamdi Azikiwe UniversityP.M.B.5025AwkaNigeria Department of Chemical Engineering Nnamdi Azikiwe UniversityP.M.B.5025AwkaNigeria Technical Institute of Physics and Chemistry Chinese Academy of Sciences29 Zhongguancun East RoadHaidian DistrictBeijing 100190China

Cellulose nanocrystals isolated from water hyacinth fiber(WHF)have been studied as a reinforcement for polyvinyl alcohol(PVA)-gelatin *** composite design was used to study and optimize effects of the PVA,gelatin and cellulose nanocrystal(CNC)concentration on tensile strength and elongation of formed *** results of this study showed that WHF CNC had a diameter range of 20-50 nm produced films reaching 13.8 MPa tensile *** stability of the films was improved from 380℃ to 385℃ in addition of CNCs and maximum storage modulus of 3 GPa were observed when 5 wt%CNC was ***,water absorption,water vapour permeability(WVP)and moisture uptake of the films decreased in addition of CNC to the PVA-gelatin *** uptake decreased from 22.50%to 19.05%while the least WVP when 10 wt%CNC added was 1.64×10^(-6)g/(m·h·Pa).These results show possibility for industrial application of WHF CNC and PVA-gelatin blends in biodegradable films for on-the-go food wrappers.

关键词： WATER hyacinth Polyvinyl alcohol Gelatin Cellulose nanocrystals Central composite design Packaging films degradation properties

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