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Poly(1,8-octanediol citrate)/bioactive glass composite with improved mechanical performance and bioactivity for bone regeneration

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Chinese Chemical Letters 2017年第11期28卷 2116-2120页

作者： Hui-Hui ren Hui-Yu Zhao Yang cui Xiang Ao Ai-ling Li Zhong-Min Zhang Dong Qiu Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and Chemistry CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100190 China Department of Orthopedics The Third Affiliated Hospital of Southern Medical University Guangzhou 510665 China

Poly（1,8-octanediol-co-citrate）（POC） represents a new promising biocompatible and biodegradable polyester that has been extensively investigated for soft tissue engineering. However, the poor mechanical performance and poor bioactivity limit its application in bone regeneration. In this study, a series of POC/bioactive glasses （BG） composites were developed using 45S5 Bioglass^Θ and a phytic acid- derived bioactive glass （referred as PSC）. The results indicated that calcium in BG could enhance the crosslinking of the POC/BG composites by forming calcium dicarboxylate bridges and thus improve their mechanical performances. When PSC were used, the composites exhibited significantly better mechanical properties compared to composites with 45S5 Bioglass^Θ. For example, by incorporating 70wt% PSC, the compressive strength of POC/PSC composites could be improved to approximately 50 MPa and modulus 1.3-h 0.1 GPa. Furthermore, all these POC/PSC composites showed good in vitro bioactivity and cellular biocompatibility. Histology results in femoral condyle defects of Sprague-Dawley rats indicated that the POC/PSC samples integrated well with surrounding tissues and stimulated bone regeneration. The improved mechanical properties and bioactivity of POC/PSC composites make them promising for potential application in bone regeneration.

关键词： Bioactive glasses Poly(1 8-octanediol-co-citrate) Composites Mechanical properties Bioactivity

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Diffusive gradients in thin films using molecularly imprinted polymer binding gels for in situ measurements of antibiotics in urban wastewaters

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Frontiers of Environmental Science & Engineering 2020年第6期14卷 211-222页

作者： Ying cui Feng Tan Yan Wang Suyu ren Jingwen Chen Key Laboratory of Industrial Ecology and Environmental Engineering(MOE) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

Urban wastewater is one of main sources for the introduction of antibiotics into the *** the concentrations of antibiotics in wastewater is necessary for estimating the amount of antibiotics discharged into the environment through urban wastewater treatment *** this study,we report a novel diffusive gradient in thin films(DGT)method based on molecularly imprinted polymers(MIPs)for in situ measurement of two typical antibiotics,fluoroquinolones(FQs)and sulfonamides(SAs)in urban *** show specific adsorption toward their templates and their structural analogs,resulting in the selective uptake of the two target antibiotics during MIP-DGT *** uptake performance of the MIP-DGTs was evaluated in the laboratory and was relatively independent of solution pH(4.0-9.0),ionic strength(1-750 mmol/L),and dissolved organic matter(DOM,0-20 mg/L).MIP-DGT samplers were tested in the effluent of an urban wastewater treatment plant for field trials,where three SA(sulfamethoxazole,sulfapyridine,and trimethoprim)and one FQ(ofloxacin)antibiotics were detected,with concentrations ranging from 25.50 to 117.58 ng/L,which are consistent with the results measured by grab *** total removal efficiency of the antibiotics was 80.1%by the treatment *** study demonstrates that MIP-DGT is an effective tool for in situ monitoring of trace antibiotics in complex urban wastewaters.

关键词： Diffusive gradients in thin films Molecularly imprinted polymers Selective uptake Antibiotics Passive sampling

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Do credit constraints affect households'economic vulnerability?Empirical evidence from rural China

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Journal of Integrative Agriculture 2021年第9期20卷 2552-2568页

作者： PENG Yan-ling Yanjun ren LI Hou-jian College of Economics Sichuan Agricultural UniversityChengdu 611130P.R.China Department of Agricultural Markets Leibniz Institute of Agricultural Development in Transition EconomiesHalle(Saale)06120Germany

Poverty alleviation is still one of the major challenges in developing countries,especially in transitional economy like *** the perspective of anti-poverty,this paper examines the impact of formal credit constraints(FCCs)and informal credit constraints(IFCCs)on economic vulnerability(EV)using the data from the China Household Income Project(CHIP)survey for 2013(CHIPs 2013)of rural *** potential endogeneity problem of credit constraints(CCs)is addressed by applying the control function approach within an ordered probit *** results show that both FCCs and IFCCs have a robust positive and significant impact on the EV of rural households and that the impact of FCCs is greater than that of *** identify the potential mechanisms through which CCs affect EV,the seemingly unrelated regressions are used and the potential intercorrelation among these mechanisms is *** find that the impact of CCs on EV is partly mediated by health,trust,per capita financial assets and per capita income,whereby health and per capita income contribute to most of the total indirect ***,policies focus on supply-side and demand-side to improve credit accessibility could reduce rural households'EV,especially through its positive effect on health and per capita income.

关键词： credit constraints economic vulnerability causal mediation mechanisms rural China

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Trajectory planning and yaw rate tracking control for lane changing of intelligent vehicle on curved road

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Science China(Technological Sciences) 2011年第3期54卷 630-642页

作者： ren DianBo ZHANG JiYe ZHANG JingMing cui ShengMin School of Automotive Engineering Harbin Institute of Technology at Weihai Weihai 264209 China State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China

The lateral control for lane changing of intelligent vehicle on curved road in automatic highway systems was studied. Based on trapezoidal acceleration profile, considering the curvature difference between starting lane and target lane, a new virtual trajectory planning method for lane changing on curved road was presented, and the calculating formulas for ideal states of vehicle in the inertial coordinate system during a lane changing maneuver were established. Applying the predetermined trajectory, the reference yaw angle and yaw rate for lane changing were generated. On the assumption that the information on yaw rate of vehicle can be measured with on-board sensors and based on the lateral dynamical model of vehicle, the yaw-rate-tracking control law was designed by applying nonsingular terminal sliding mode technology. Based on Lyapunov function method, the finite-time convergence property of the system was obtained from the phase-plane analysis. Simulation results showed that if the curvature difference between starting lane and target lane was not considered, then at the finishing time of lane changing, it was impossible to avoid the deviation of the virtual trajectory panned from the target lane, which increased with the decrease of curvature radius. With the trajectory planning method and yaw rate-tracking control law proposed in this paper and considering the curvature difference between the starting lane and target lane, the desired virtual trajectory for lane changing without deviation was obtained and the expected tracking performance was also verified by the simulation.

关键词： intelligent vehicle lane changing trajectory planning yaw rate-tracking

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Numerical analysis of enhanced mixing in a Gallay tote blender

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Particuology 2016年第6期14卷 95-102页

作者： Xinxin ren Guangzheng Zhou Ji xu Lijie cui Wei Ge State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 China

The mixing performance of a multi-bladed baffle inserted into a traditional Gallay tote blender is explored by graphic processing unit-based discrete element method software. The mixing patterns and rates are investigated for a binary mixture, represented by two different colors, under several loading profiles. The baffle effectively enhances the convective mixing both in the axial and radial directions, because of the disturbance it causes to the initial flowing layer and solid-body zone, compared with a blender without a baffle. The axial mixing rate is affected by the gap between the baffle and the wall on the left and right sides, and an optimal blade length corresponds to the maximum mixing rate. However, the radial mixing rate increases with the blade length almost monotonically.

关键词： Powder mixing Tote blender Granular materials Discrete element method Simulation Baffle

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Biocompatibility and Cu ions release kinetics of copper-bearing titanium alloys

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Journal of Materials Science & Technology 2021年第36期95卷 237-248页

作者： ling ren Xiaohe Xu Hui Liu Ke Yang Xun Qi Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China Department of Ophthalmology Shengjing Hospital of China Medical University36 Sanhao StreetShenyang 110001China School of Materials Science and Engineering University of Science and Technology of China96 Jinzhai RoadHefei 230026China Key Laboratory of Diagnostic Imaging and Interventional Radiology of Liaoning Province Department of RadiologyThe First Affiliated Hospital of China Medical University155 Nanjing Bei StreetShenyang 110001China

To reduce the risk of implant-associated infections,we previously designed and developed a series of medical copper(Cu)-bearing titanium alloys that release Cu ions and hence play an antibacterial ***,both excessive and deficient Cu levels adversely affect human health;therefore,the aim of the present study was to comprehensively evaluate the short-and long-term biosafety of Cu-bearing titanium alloys(Ti6 Al4V-Cu and Ti-Cu)both in vitro and in ***,the predominant kinetic mechanism of Cu ions release and its effect on biosafety were also *** results indicate that the biocompatibility of the Cu-bearing titanium alloys meets the requirements of ISO standards and the Cu ion release kinetics display a good correlation over the entire time period in the normal zero-order model with an almost constant release *** release rate maintained at a parts per billion level safe for humans;consequently,we can conclude that our Cu-bearing titanium alloys have satisfactory biocompatibility.

关键词： Cu ions Kinetic Biocompatibility Titanium

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Antibacterial copper-bearing titanium alloy prepared by laser powder b e d fusion for superior mechanical performance

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Journal of Materials Science & Technology 2023年第1期132卷 100-109页

作者： Huan Liu Hai Wang ling ren Dong Qiu Ke Yang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Centre for Additive Manufacturing School of EngineeringRMIT UniversityMelbourneVictoriaAustralia Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology Weiqiao-UCAS Science and Technology ParkBinzhouShandong Province256606China

Copper element was added in pure titanium to produce a new biomedical titanium-copper alloy by laser powder bed fusion(LPBF).Addition of copper can eliminate the mismatch of high strength but poor duc-tility problem caused by lathα’martensite,which is the usual microstructure of nearαtitanium alloy fabricated by *** of by the usual trade-offrelationship between strength and ductility,which is a long-standing challenge for martensitic titanium alloys,in this study,we proposed a boundary engineer-ing strategy and aim to synergistically enhance the strength and ductility of martensitic titanium alloy fabricated by *** is hypothesized that whilst both low-angle and high-angle grain boundaries are beneficial to the strength,high-angle grain boundary can simultaneously improve the ductility of *** test this strategy,a Ti-5Cu(wt.%)alloy is selected to compare against pure titanium and Ti-6Al-4V at the same laser processing ***,TEM and XRD analysis show that the as-fabricated LPBF Ti-5Cu alloy is comprised of partially tempered martensite with extraordinarily high number density of both high-angle and low-angle grain boundaries as well as low dislocation *** microstructure enables a high tensile strength of 940-1020 MPa,which is at a similar level as LPBF Ti-6Al-4V,and an excellent elongation of 13%-16%,twice as much as that of LPBF *** mechanism of microstruc-ture refinement in LPBF Ti-5Cu at different levels from prior-βgrains,martensitic packets,blocks to laths is also discussed.

关键词： Titanium alloy Laser powder bed fusion Boundary engineering Martensite Mechanical properties

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Thermochromic Silks for Temperature Management and Dynamic Textile Displays

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Nano-Micro Letters 2021年第5期13卷 17-33页

作者： Yang Wang Jing ren Chao Ye Ying Pei Shengjie ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhouPeople’s Republic of China

Silks have various advantages compared with synthetic polymer fibers,such as sustainability,mechanical properties,luster,as well as air and humidity ***,the functionalization of silks has not yet been fully *** techniques that retain or even improve the sustainability of silk production are *** this end,a low-cost,effective,and scalable strategy to produce TCSs by integrating yarn-spinning and continuous dip coating technique is developed *** with extremely long length(>10 km),high mechanical performance(strength of 443.1 MPa,toughness of 56.0 MJ m−3,comparable with natural cocoon silk),and good interfacial bonding were *** can be automatically woven into arbitrary fabrics,which feature super-hydrophobicity as well as rapid and programmable thermochromic responses with good cyclic performance:the response speed reached to one second and remained stable after hundreds of ***,applications of TCS fabrics in temperature management and dynamic textile displays are demonstrated,confirming their application potential in smart textiles,wearable devices,flexible displays,and human–machine ***,combination of the fabrication and the demonstrated applications is expected to bridge the gap between lab research and industry and accelerate the commercialization of TCSs.

关键词： Silk Thermochromic Smart textile Dynamic display

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Recent progress in single crystal perovskite X-ray detectors

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Science China(Information Sciences) 2024年第3期67卷 5-19页

作者： Xiao LIU Jun ren Yu-Ang CHEN Xiangshun GENG Dan XIE Tian-ling ren School of Integrated Circuits Tsinghua University Beijing National Research Center for Information Science and Technology (BNRist)

Perovskites have attracted extensive attention as radiation detection material due to their long carrier diffusion length and lifetime, high absorption coefficient, and flexible manufacturing process. Compared with polycrystalline structures, single crystal perovskites improve the performance of optoelectronic devices due to their low defect state density, better photoelectric characteristics, and chemical ***, we review the recent progress of single crystal perovskite X-ray detectors. First, we briefly introduced the basic concepts, detection mechanisms, figure of merits of perovskite X-ray detectors, and the preparation methods of single crystal perovskites. Then, we summarized the significant advancements in single crystal perovskite X-ray detectors in recent times. Finally, we discussed the critical challenges and some practicable solutions for developing high-performance X-ray detectors.

关键词： single crystal perovskites carrier transport radiation detection X-ray detectors X-ray imaging

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Violin String Inspired Core-Sheath Silk/Steel Yarns for Wearable Triboelectric Nanogenerator Applications

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Advanced Fiber Materials 2020年第1期2卷 24-33页

作者： Chao Ye Quanfu Xu Jing ren Shengjie ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210China Department of Cardiology Xinhua HospitalSchool of MedicineShanghai Jiao Tong University200092 ShanghaiChina

Triboelectric nanogenerator(TENG)has attracted considerable attention in wearable electronics and energy harvesting associated with human ***/yarn electrodes are widely applied in the wearable TENG system,which remains a challenge to guarantee mechanical ductility and stable electrical functions during long-term *** by high quality violin strings core-sheath design,silk/stainless-steel integrated yarns(SSYs)are continuously produced by simple co-wrapping spinning technique,which shows excellent mechanical strength,flexibility,conductivity,weaveability and triboelectric *** SSYs can be modified to achieve tunable surface ***,TENG cables have been fabricated,which can be stretched up to 100%and reveal a fast responsiveness to the stretching extent(voltage output of about 0.2,0.6,1.8,2.8 V at 13%,25%,38%,50%stretching,respectively).The TENG cables integrated textiles can not only harvest the energy generated by body movement but can also work as a self-supplied motion detector.

关键词： Silk Fiber Triboelectric nanogenerator Wearable energy devices

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