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Chinese Chemical Letters 2023年第4期34卷 396-401页

作者： Jingyang Luo Yuxiao Li Wenxuan Huang feng Wang Shiyu fang Xiaoshi Cheng qian feng fang fang Jiashun Cao Yang Wu Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

The distinct influences of cephalosporins(CEPs, i.e., cefamandole nafate and cefpirome sulfate) affiliated to different generations on the volatile fatty acids(VFAs) production and antibiotic resistance genes(ARGs) fates during waste activated sludge(WAS) fermentation were unveiled. The presence of CEPs mainly exhibited negative effects on the total VFAs production(5%–15% reduction), especially the cefamandole nafate, which is quite different to previous understanding. Further investigation revealed that the CEPs contributed to the solubilization and hydrolysis but inhibited the acidification process by affecting the functional microbial populations(i.e., Tissierella) and general microbial metabolic activities(i.e., pyruvate metabolism and VFAs biosynthesis). In addition, CEPs(especially the cefpirome sulfate)caused the propagation of ARGs(i.e., bla TEM, tet X and mex F) during WAS fermentation. CEPs enhanced the cell membrane permeability to promote the antibiotics mechanism of efflux pump and the horizontal transfer of ARGs. Also, the CEPs altered the regulatory systems(i.e., two component system) and microbial populations associated with ARGs, resulting in the proliferation of specific ARGs. Overall, the dissimilarity of different CEPs impacts on the WAS fermentation for VFAs production and ARGs variations enlightened the diverse environmental behaviors of anthropogenic pollutants and evoked the caution of ecological risks.

关键词： Wasteactivated sludge(WAS) Cephalosporins(CEPs) Volatilefattyacids(VFAs) Antibiotic resistancegenes(ARGs) Geneticexpressions

Highly Ordered Thermoplastic Polyurethane/Aramid Nanofiber Conductive Foams Modulated by Kevlar Polyanion for Piezoresistive Sensing and Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第6期15卷 335-352页

作者： Kunpeng qian Jianyu Zhou Miao Miao Hongmin Wu Sineenat Thaiboonrod Jianhui fang Xin feng School of Materials Sciences and Engineering Shanghai UniversityShanghai 200444People’s Republic of China Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444People’s Republic of China National Nanotechnology Center(NANOTEC) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane(TPU) foams reinforced by aramid nanofibers(ANF) with adjustable pore-size distribution were successfully obtained via a nonsolvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles(Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti_(3)C_(2)T_(x) MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti_(3)C_(2)T_(x) MXene(PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa(50% strain) with good sensitivity at 0.46 kPa^(-1). Meanwhile,the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.

关键词： Highly ordered conductive foams MXene Nanofiber Thermoplastic Kevlar polyanion Piezoresistive sensing Electromagnetic interference shielding

Synchronous deprotonation–protonation for mechanically robust chitin/aramid nanofibers conductive aerogel with excellent pressure sensing, thermal management, and electromagnetic interference shielding

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Nano Research 2024年第3期17卷 2038-2049页

作者： Xinxin Zhang Kunpeng qian Jianhui fang Sineenat Thaiboonrod Miao Miao Xin feng Department of Chemistry College of SciencesShanghai UniversityShanghai 200444China Research Center of Nano Science and Technology College of SciencesShanghai UniversityShanghai 200444China School of Materials Sciences and Engineering Shanghai UniversityShanghai 200444China National Nanotechnology Center(NANOTEC) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Aerogels with regularly porous structure and uniformly distributed conductive networks have received extensive attention in wearable electronic sensors,electromagnetic shielding,and so on.However,the poor mechanical properties of the emerging nanofibers-based aerogels are limited in practical applications.In this work,we developed a synchronous deprotonation–protonation method in the KOH/dimethyl sulfoxide(DMSO)system at room temperature for achieving chitin cross-linked aramid nanofibers(CANFs)rather than chitin nanofibers(ChNFs)and aramid nanofibers(ANFs)separately by using chitin and aramid pulp as raw materials.After freeze-drying process,the cross-linked chitin/aramid nanofibers(CA)aerogel exhibited the synergetic properties of ChNF and ANF by the dual-nanofiber compensation strategy.The mechanical stress of CA aerogel was 170 kPa at 80%compressive strain,increased by 750%compared with pure ChNF aerogel.Similarly,the compressibility of CA aerogel was somewhat improved compared to ANF aerogel.The enhancement verified that the crosslinking reaction between ANF and ChNF during the synchronous deprotonation process was formed.Afterwards,the conductive aerogels with uniform porous structure(CA-M)were successfully obtained by vacuum impregnating CA aerogels in Ti_(3)C_(2)T_(x) MXene solution,displaying low thermal conductivity(0.01 W/(m·K)),high electromagnetic interference(EMI)shielding effectiveness(SE)(75 dB),flame retardant,and heat insulation.Meanwhile,the as-obtained CA-M aerogels were also applied as a pressure sensor with excellent compression cycle stability and superior human motion monitoring capabilities.As a result,the dual-nanofiber based conductive aerogels have great potentials in flexible/wearable electronics,EMI shielding,flame retardant,and heat insulation.

关键词： synchronous deprotonation–protonation electromagnetic interference(EMI)shielding flame retardant heat insulation pressure sensing

Tribological properties of transition metal di-chalcogenide based lubricant coatings

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Frontiers of Materials Science 2012年第2期6卷 116-127页

作者： Jun-feng YANG Braham PARAKASH Jens HARDELL qian-feng fang Department of Applied Physics and Mechanical Engineering Lulea University of TechnologySE-97187 LuleaSweden Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China

Transition metal di-chalcogenides MX2 （X= S, Se, Te; and M = W, Mo, Nb, Ta） are one kind of solid lubricant materials that have been widely used in industry. The lubricant properties of such lubricant coatings are dependent not only on microstructure, orientation, morphology, and composition of the coatings, but also on the substrate, the interface between substrate and lubricant coatings, and the specific application environment. In this review, the effects of parameters on tribological properties of such kind of lubricant coatings were summarized. By comparing advantages and disadvantages of those coatings, the special treatments such as doping, structural modulation and post-treatment were suggested, aiming to improve the tribologicai performance under severe test conditions （e.g. high temperature, oxidizing atmosphere or humid condition）.

关键词： transition metal di-chalcogenide solid lubricant coating tribologicalproperty

Influence of service temperature on tribological characteristics of self-lubricant coatings： A review

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Frontiers of Materials Science 2013年第1期7卷 28-39页

作者： Jun-feng YANG Yan JIANG Jens HARDELL Braham PRAKASH qian-feng fang Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Department of Applied Physics and Mechanical Engineering Lulea University of Technology SE-971 87 Lulea Sweden

Self-lubricating coatings have been widely used to reduce friction in moving machine assemblies. However, the tribological performance of these coatings is strongly dependent on the service temperature. In this paper, an extensive review pertaining to the influence of operating service temperature on tribological performance of self-lubricating coatings has been carried out. Based on the effective lubricating temperature range, the self-lubricating coatings developed in the past have been divided into three groups: low temperature lubricant coating (from −200°C to room temperature), moderate temperature lubricant coating (from room temperature to 500°C) and high temperature lubricant coating (> 500°C). Ideas concerning possible ways to extend the operating temperature range of self-lubricating coatings have been presented as follows: hybridized tribological coating, adaptive tribological coatings, and diffusion rate limited solid lubricant coating. In addition, a new self-lubricating coating formulation for potential application at a wide operating temperature range has been proposed.

关键词： temperature solid lubricant self-lubricating coating tribological property

C60intercalating Ti_(3)C_(2)T_(x) MXenes assisted by γ-cyclodextrin for electromagnetic interference shielding films with high stability

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Journal of Materials Science & Technology 2022年第32期127卷 71-77页

作者： Kunpeng qian Shuang Li Jianhui fang Yuhuan Yang Shaomei Cao Miao Miao Xin feng School of Materials Sciences and Engineering Shanghai UniversityShanghai 200444China Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444China Dehong Autonomous Prefecture Institute of Sugar Industry Yunnan 678400China

Ti_(3)C_(2)T_(x)MXenes with excellent metallic conductivity and flexibility have shown a promising prospect as electromagnetic interference(EMI) shielding materials. Ultrathin, hierarchical hybrid films were fabricated by using C60intercalating Ti_(3)C_(2)T_(x)MXenes with the assistance of water-soluble γ-cyclodextrin(CD). The C_(60)/CD complex was obtained by high-speed vibration milling using hydrophilic CD as dispersing agent. After thermal annealing treatment, the obtained hybrid film exhibited excellent EMI shielding(53.52±0.43 dB), hydrophobicity(water contact angle: 93.7°) and mechanical stability(over 0.9 million bending times). Taking advantage of the antioxidant of C_(60), the chemical durability of Ti_(3)C_(2)T_(x) MXenes based hybrid films was also improved as expected. These results indicate that the well-designed hierarchical hybrid films with the intercalation of C_(60) have promising potential for high-performance EMI shielding applications.

关键词： Ti_(3)C_(2)T_(x)MXenes C_(60) High conductivity Stability EMI shielding

Bimetallic active site nuclear-shell heterostructure enables efficient dual-functional electrocatalysis in alkaline media

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稀有金属:英文版 2023年第9期42卷 3024-3033页

作者： Yu Cheng Xi Zhou Qin-Min Pan Li-fang Zhang Yu-feng Cao Tao qian School of Chemistry and Chemical Engineering Nantong UniversityNantong226019China Institute of Chemical Industry of Forestry Products Chinese Academy of ForestryKey Lab.of Biomass Energy and MaterialNanjing210000China School of Chemical and Environmental Engineering College of ChemistryChemical Engineering and Material ScienceSoochow UniversitySuzhou215123China Department of Chemical Engineering University of WaterlooWaterlooONN2L 3G1Canada

Hydrogen,as a green and clean next-generation fuel,is a key to achieving the goal of carbon neutrality.Constructing an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same electrolyte is a key technology for producing hydrogen via water splitting.Herein,a bimetallic active site catalyst,which possessed an edge-riched MoS_(2)nanoflakes array vertically growing on cubic CoS_(2),forming a nuclear-shell heterogeneous configuration,termed CSC-Mo S_(2)@Co S_(2).was reported The optimal CSC-Mo S_(2)@Co S_(2)-24 possessed good dualfunctional electrocatalytic activity(hydrogen evolution(HER),10 m A·cm^(-2)@241.5 m V and oxygen evolution(OER),10 m A·cm^(-2)@350 m V).Especially,CSC-Mo S_(2)@CoS_(2)-24 exhibited an extremely high mass activity for HER,and only required an overpotential of~550 m V when reaching a large current density of 1422 m A·mg^(-1),which was20.6-fold that of the bulk CoS_(2)(69 m A·mg^(-1)),as well as exhibiting stability of up to 100 h.The good electrocatalytic performance was attributed to the nuclear-shell heterostructure of Mo S_(2)@CoS_(2)hybrid could bring critical synergies,improving efficient mass transfer and electron transfer processes between Co S_(2)and Mo S_(2),which collaboratively promoted the electrocatalytic kinetics.It is foreseeable that the method proposed in this work will have guiding value for the preparation of dual-functional electrocatalysts with multi-interface heterostructures by assembling layered sulfides on cubic sulfides.

关键词： Dual-functional electrocatalysts Nuclearshell cubic heterostructure Edge-riched Bimetallic active site Strong interaction

Effect of chromium content on microstructure and corrosion behavior of W-Cr-C coatings prepared on tungsten substrate

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Frontiers of Materials Science 2015年第1期9卷 77-84页

作者： Yan JIANG Jun-feng YANG qian-feng fang Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

W-Cr-C coatings with different chromium contents （0-3wt.%） were fabricated on the tungsten substrates by spark plasma sintering （SPS） method from the graphite and chromium mixed powders. SEM and XRD were exploited to analyze the effect of Cr contents on the microstructure of coatings. It was found that the abnormal hollow WC grains disappeared with addition of Cr less than 2%, and the microstructures were largely refined and densified. With further increase of Cr addition, the grains changed slightly but the densificaUon was reduced. The most dense coating was achieved at I wt.% Cr. Corrosion behavior of the W-Cr-C coatings were investigated by impedance spectrum and potentiodynamic polarization tests. Results suggested that the W-1Cr-C coated W sample exhibited the lowest corrosion current density and highest corrosion potential due to the most densified microstructure, indicating that the addition of Cr at 1 wt.% was optimal for WC coating against corrosion.

关键词： W-Cr-C coating spark plasma sintering （SPS） corrosion resistance electrochemical measurement

Application of Gene Therapy in Hemophilia

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Current Medical Science 2022年第5期42卷 925-931页

作者： Yue-fen HU Yun-hai fang Yong-rong LAI Xiao-qin feng Shu-qian XU Department of Hematology Qilu HospitalCheeloo College of MedicineShandong UniversityJinan 250014China Shandong Blood Center Shandong Hemophilia Treatment CenterJinan 250014China Department of Hematology the First Affiliated Hospital of Guangxi Medical UniversityNanning 530021China Nanfang Hospital Southern Medical UniversityGuangzhou 510000China

Gene therapy refers to introducing normal exogenous genes into target cells to correct or compensate for the diseases caused by defective and abnormal genes for the purpose of therapy.It holds out hope of a cure for single-gene genetic diseases such as thalassemia,hemophilia,etc.At present,gene therapy is performed in two ways:introducing exogenous genes,and gene editing.A great number of clinical trials of gene therapy in hemophilia have been carried out using viral vectors to introduce foreign genes into target cells.However,the production of neutralizing antibodies following injection and the inability to prepare viral vectors in large quantities limit their application.Although gene-editing methods like CRISPR avoid the above problems,the potential risks of off-target effects are still unknown.More trials and evidence are needed to elucidate the safety and accuracy of gene therapy.This paper will review the bench and clinical work of gene therapy in hemophilia in recent years,and summarize the challenges and prospects of gene therapy,so as to provide directions for future scientific research in this field.

关键词： hemophilia gene therapy CRISPR-Cas9 application