This study presents a solvent-free,facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin(MV)using vanillin.The resulting MV not only imparted antibacterial properties to...This study presents a solvent-free,facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin(MV)using vanillin.The resulting MV not only imparted antibacterial properties to coatings layered on leather,but could also be employed as a green alternative to petroleum-based carcinogen styrene(St).Herein,MV was copolymerized with butyl acrylate(BA)to obtain waterborne bio-based P(MV-BA)miniemulsion via miniemulsion polymerization.Subsequently,MXene nanosheets with excellent photothermal conversion performance and antibacterial properties,were introduced into the P(MV-BA)miniemulsion by ultrasonic dispersion.During the gradual solidification of P(MV-BA)/MXene nanocomposite miniemulsion on the leather surface,MXene gradually migrated to the surface of leather coatings due to the cavitation effect of ultrasonication and amphiphilicity of MXene,which prompted its full exposure to light and bacteria,exerting the maximum photothermal conversion efficiency and significant antibacterial efficacy.In particular,when the dosage of MXene nanosheets was 1.4 wt%,the surface temperature of P(MV-BA)/MXene nanocomposite miniemulsioncoated leather(PML)increased by about 15℃ in an outdoor environment during winter,and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100%under the simulated sunlight treatment for 30 min.Moreover,the introduction of MXene nanosheets increased the air permeability,water vapor permeability,and thermal stability of these coatings.This study provides a new insight into the preparation of novel,green,and waterborne bio-based nanocomposite coatings for leather,with desired warmth retention and antibacterial properties.It can not only realize zerocarbon heating based on sunlight in winter,reducing the use of fossil fuels and greenhouse gas emissions,but also improve ability to fight off invasion by harmful bacteria,viruses,and other microorganisms.展开更多
Over the past few decades,the design and development of carbon materials have occurred at a rapid pace.In particular,these porous graphene-like carbon nitride materials have received considerable attention due to thei...Over the past few decades,the design and development of carbon materials have occurred at a rapid pace.In particular,these porous graphene-like carbon nitride materials have received considerable attention due to their superior structures and performances in the energy transformation field.In this review,nitrogenated holey two-dimensional graphene and polymeric carbon nitride will be discussed in depth.The structural properties,synthetic methods,and applications including electrocatalytic reactions,such as hydrogen evolution reaction,oxygen reduction reaction,oxygen evolution reaction,and nitrogen reduction reaction,will be presented in detail.Finally,we will present the outlooks on the current obstacles to the development of carbon nitride materials.This comprehensive understanding will help guide and motivate researchers to develop and modify carbon nitride materials with better properties in the future.展开更多
In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO_(2) in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs_(2)AgBiB...In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO_(2) in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs_(2)AgBiBr_(6) double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO_(2)/Cs_(2)AgBiBr_(6) composite, which was identified as an S-cheme heterojunction. TiO_(2)/Cs_(2)AgBiBr_(6) composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO_(2) could be boosted to 0.1369 min^(-1). This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO_(2)/Cs_(2)AgBiBr_(6) composites, which will facilitate the generation of new ideas for improving TiO_(2)’s photocatalytic performance.展开更多
There is a continuing quest to rationally fabricate polymeric biomaterials with both high transfection efficiency and minimal toxicity for the emerging opportunities in small interfering RNA(siRNA)delivery.Recently,th...There is a continuing quest to rationally fabricate polymeric biomaterials with both high transfection efficiency and minimal toxicity for the emerging opportunities in small interfering RNA(siRNA)delivery.Recently,this goal was promoted highly by developing a robust and efficient strategy to facilitate polymer-mediated RNAi using natural polyphenols with multiple phenol groups that could condense siRNA effectively into negatively charged nanoparticles(NPs).Further coating of these NPs with cationic polymers of low molecular weight enabled their intracellular siRNA delivery.Inspired by the structural and functional features of natural polyphenols,we aimed to further the development of low molecular weight polycatechols as a new class of efficient and biocompatible polymers for siRNA delivery in our current study.The fabricated polycatechols have benefits of requiring only one-step fabrication toward efficient siRNA nanoformulations.Moreover,they could deliver siRNA into cells and silence target genes both in vitro and in vivo.The resulting polycatechol/siRNA formulations were also functionally competent,demonstrating a successful,profound downregulation of a proinflammatory enzyme to attenuate chronic intestinal inflammation in an intestinal injury model.This study provides a new approach in chemistry for the development of efficient synthetic polymers for therapeutic siRNA delivery.展开更多
Nowadays,the increasing demands from consumer challenges the traditional leather products.Traditional polymer leather finishes gradually lose their dominant position in the market.To address this issue,recent research...Nowadays,the increasing demands from consumer challenges the traditional leather products.Traditional polymer leather finishes gradually lose their dominant position in the market.To address this issue,recent research effort has been devoted to developing polymer-based organic-inorganic nanocomposite leather finishes due to their various functional properties including antibacterial,self-cleaning and water-resistant property.In this review,we provide a comprehensive overview of synthesis of polymer-based organic-inorganic nanocomposites and their application as functional leather finishes.With the perspective of their properties and current challenges,an outlook in the future development about crafting functional and high-quality leather finishes are further proposed.展开更多
基金supported by the National Natural Science Foundation of China and(52073164 and 21838007).
文摘This study presents a solvent-free,facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin(MV)using vanillin.The resulting MV not only imparted antibacterial properties to coatings layered on leather,but could also be employed as a green alternative to petroleum-based carcinogen styrene(St).Herein,MV was copolymerized with butyl acrylate(BA)to obtain waterborne bio-based P(MV-BA)miniemulsion via miniemulsion polymerization.Subsequently,MXene nanosheets with excellent photothermal conversion performance and antibacterial properties,were introduced into the P(MV-BA)miniemulsion by ultrasonic dispersion.During the gradual solidification of P(MV-BA)/MXene nanocomposite miniemulsion on the leather surface,MXene gradually migrated to the surface of leather coatings due to the cavitation effect of ultrasonication and amphiphilicity of MXene,which prompted its full exposure to light and bacteria,exerting the maximum photothermal conversion efficiency and significant antibacterial efficacy.In particular,when the dosage of MXene nanosheets was 1.4 wt%,the surface temperature of P(MV-BA)/MXene nanocomposite miniemulsioncoated leather(PML)increased by about 15℃ in an outdoor environment during winter,and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100%under the simulated sunlight treatment for 30 min.Moreover,the introduction of MXene nanosheets increased the air permeability,water vapor permeability,and thermal stability of these coatings.This study provides a new insight into the preparation of novel,green,and waterborne bio-based nanocomposite coatings for leather,with desired warmth retention and antibacterial properties.It can not only realize zerocarbon heating based on sunlight in winter,reducing the use of fossil fuels and greenhouse gas emissions,but also improve ability to fight off invasion by harmful bacteria,viruses,and other microorganisms.
基金The authors acknowledge the financial support from the National Natural Science Foundation of China(22001228)the“Double-First Class”University Construction Project(C176220100022 and C176220100042)+2 种基金the Major Science and Technology Project of Precious Metal Materials Genetic Engineering in Yunnan Province(2019ZE001-1 and 202002AB080001)the International Joint Research Center for Advanced Energy Materials of Yunnan Province(202003AE140001)Guangzhi Hu is grateful to the Double Tops Joint Fund of the Yunnan Science and Technology Bureau and Yunnan University(2019FY003025).
文摘Over the past few decades,the design and development of carbon materials have occurred at a rapid pace.In particular,these porous graphene-like carbon nitride materials have received considerable attention due to their superior structures and performances in the energy transformation field.In this review,nitrogenated holey two-dimensional graphene and polymeric carbon nitride will be discussed in depth.The structural properties,synthetic methods,and applications including electrocatalytic reactions,such as hydrogen evolution reaction,oxygen reduction reaction,oxygen evolution reaction,and nitrogen reduction reaction,will be presented in detail.Finally,we will present the outlooks on the current obstacles to the development of carbon nitride materials.This comprehensive understanding will help guide and motivate researchers to develop and modify carbon nitride materials with better properties in the future.
基金the financial support from National Natural Science Foundation of China(Grant Nos.52073164,52103088)Innovation Capability Support Program of Shaanxi(Program No.2021TD-16).
文摘In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO_(2) in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs_(2)AgBiBr_(6) double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO_(2)/Cs_(2)AgBiBr_(6) composite, which was identified as an S-cheme heterojunction. TiO_(2)/Cs_(2)AgBiBr_(6) composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO_(2) could be boosted to 0.1369 min^(-1). This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO_(2)/Cs_(2)AgBiBr_(6) composites, which will facilitate the generation of new ideas for improving TiO_(2)’s photocatalytic performance.
基金supported by the National Key R&D Program of China,Synthetic Biology Research(no.2019YFA0904500)the National Natural Science Foundation of China(nos.21725402 and 21774079)+1 种基金the Shanghai Municipal Science and Technology Commission(no.17XD1401600)the Guangdong Innovative and Entrepreneurial Research Team Program(no.2016ZT06C322).
文摘There is a continuing quest to rationally fabricate polymeric biomaterials with both high transfection efficiency and minimal toxicity for the emerging opportunities in small interfering RNA(siRNA)delivery.Recently,this goal was promoted highly by developing a robust and efficient strategy to facilitate polymer-mediated RNAi using natural polyphenols with multiple phenol groups that could condense siRNA effectively into negatively charged nanoparticles(NPs).Further coating of these NPs with cationic polymers of low molecular weight enabled their intracellular siRNA delivery.Inspired by the structural and functional features of natural polyphenols,we aimed to further the development of low molecular weight polycatechols as a new class of efficient and biocompatible polymers for siRNA delivery in our current study.The fabricated polycatechols have benefits of requiring only one-step fabrication toward efficient siRNA nanoformulations.Moreover,they could deliver siRNA into cells and silence target genes both in vitro and in vivo.The resulting polycatechol/siRNA formulations were also functionally competent,demonstrating a successful,profound downregulation of a proinflammatory enzyme to attenuate chronic intestinal inflammation in an intestinal injury model.This study provides a new approach in chemistry for the development of efficient synthetic polymers for therapeutic siRNA delivery.
基金National Key Research and Development Program of China(2017YFB0308602)Key Scientific Research Group of Shaanxi province(2013KCT-08)+1 种基金Young Talent Lifts Planning Project of Shaanxi Provicial University Science Association(20180416)Scientific Research Innovation Team Building Project of Shaanxi University of Science and Technology(TD12-03).
文摘Nowadays,the increasing demands from consumer challenges the traditional leather products.Traditional polymer leather finishes gradually lose their dominant position in the market.To address this issue,recent research effort has been devoted to developing polymer-based organic-inorganic nanocomposite leather finishes due to their various functional properties including antibacterial,self-cleaning and water-resistant property.In this review,we provide a comprehensive overview of synthesis of polymer-based organic-inorganic nanocomposites and their application as functional leather finishes.With the perspective of their properties and current challenges,an outlook in the future development about crafting functional and high-quality leather finishes are further proposed.
