Water-solid triboelectric nanogenerators(TENGs),as new energy collection devices,have attracted increasing attention in ocean energy harvesting and selfpowered sensing.Polyacrylic acid(PAA)coating,usually used on the ...Water-solid triboelectric nanogenerators(TENGs),as new energy collection devices,have attracted increasing attention in ocean energy harvesting and selfpowered sensing.Polyacrylic acid(PAA)coating,usually used on the surface of marine equipment,has the property of anti-aging and anti-wear but limits triboelectrical output when used with TENGs.In this paper,polyacrylic acid coating was modified with fluorinated polyacrylate resin(F-PAA)to increase its triboelectrical output,by 6 times,and also to increase its anti-corrosion property.In addition,the corrosion resistance property can be further enhanced by cathodic protection using the electrical output generated by the water-flow triboelectrical energy transfer process.Given their easy fabrication,water-flow energy harvesting,and corrosion resistance,PAA/F-PAA coating-based TENGs have promising applications in river and ocean energy collection and corrosion protection.展开更多
Chitosan and chitooligosaccharides(COS),as derivatives of chitin through deacetylation reaction,have broad applications due to their good biodegradability,biocompatibility,and solubility.In addition,chitosan and COS a...Chitosan and chitooligosaccharides(COS),as derivatives of chitin through deacetylation reaction,have broad applications due to their good biodegradability,biocompatibility,and solubility.In addition,chitosan and COS are involved in cell wall morphogenesis and host–pathogen interactions in vivo.Chitin deacetylases(CDAs)are enzymes that can catalyze the deN-acetylation of chitin.They are widely distributed in protozoa,algae,bacteria,fungi,and insects with important physiological functions.Compared with the traditional chemical method,enzymatic catalysis by CDAs provides an enzymatic catalysis method to produce chitosan and COS with controllable deacetylation site and environmental friendliness.These characteristics attract researchers to produce CDAs by fungicides or pesticides.However,researches on heterologous expression and directed evolution of CDAs are still lacking.In this review,we summarize the latest knowledge of CDAs,especially for heterologous expression systems and directed evolution strategies,which may contribute to the industrial production and future application of CDAs.展开更多
基金the Program for Taishan Scholars of Shandong Province(No.ts20190965)the National Key Research and Development Program of China(2020YFF0304600)+2 种基金the Key Research Program of the Chinese Academy of Sciences(Grant No.XDPB24)the National Natural Science Foundation of China(Grant No.51905518)the Innovation Leading Talents Program of Qingdao(19-3-2-23-zhc)in China.
文摘Water-solid triboelectric nanogenerators(TENGs),as new energy collection devices,have attracted increasing attention in ocean energy harvesting and selfpowered sensing.Polyacrylic acid(PAA)coating,usually used on the surface of marine equipment,has the property of anti-aging and anti-wear but limits triboelectrical output when used with TENGs.In this paper,polyacrylic acid coating was modified with fluorinated polyacrylate resin(F-PAA)to increase its triboelectrical output,by 6 times,and also to increase its anti-corrosion property.In addition,the corrosion resistance property can be further enhanced by cathodic protection using the electrical output generated by the water-flow triboelectrical energy transfer process.Given their easy fabrication,water-flow energy harvesting,and corrosion resistance,PAA/F-PAA coating-based TENGs have promising applications in river and ocean energy collection and corrosion protection.
基金This work was financially supported by the Key Research and Development Program of China(2018YFA0900300)the National Natural Science Foundation of China(32021005,31870069)+1 种基金the Fundamental Research Funds for the Central Universities(JUSRP52019A,JUSRP121010,JUSRP221013)Shandong Province Key R&D Program(Major Science and Technology Innovation Project)Project(2019JZZY011002).
文摘Chitosan and chitooligosaccharides(COS),as derivatives of chitin through deacetylation reaction,have broad applications due to their good biodegradability,biocompatibility,and solubility.In addition,chitosan and COS are involved in cell wall morphogenesis and host–pathogen interactions in vivo.Chitin deacetylases(CDAs)are enzymes that can catalyze the deN-acetylation of chitin.They are widely distributed in protozoa,algae,bacteria,fungi,and insects with important physiological functions.Compared with the traditional chemical method,enzymatic catalysis by CDAs provides an enzymatic catalysis method to produce chitosan and COS with controllable deacetylation site and environmental friendliness.These characteristics attract researchers to produce CDAs by fungicides or pesticides.However,researches on heterologous expression and directed evolution of CDAs are still lacking.In this review,we summarize the latest knowledge of CDAs,especially for heterologous expression systems and directed evolution strategies,which may contribute to the industrial production and future application of CDAs.
