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Journal of Materiomics 2023年第1期9卷 174-182页

作者： Gajula Prasad Xiongwei Lin Junwei Liang Yingbang Yao Tao Tao Bo Liang Sheng-Guo Lu guangdong provincial research center on smart materials and energy conversion devices Guangdong Provincial Key Laboratory on the Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Dongguan South China Design Innovation Institute Building D-1University Innovation City AreaSongshan LakeDongguan523808China

Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous membrane.In this paper,we prepared highly intra porous fibrous poly(vinylidene fluoride)(PVDF)membranes using an innovated water-mediated electrospinning approach.FTIR-ATR and XRD techniques confirmed the conversion of non-polarα-phase to polarβ-phase in electrospun membranes.The porous fibrous membrane M–16 had adsorbed oil almost 120%and metal adsorption around 15%,12%,5%,13%respectively for Pb^(2+),Cd^(2+),Cu^(2+)and Zn^(2+),which are larger than the counterpart of nonporous M–18.The nonporous fibrous membranes have better peak to peak output voltage(Vp-Vp)2 to 3 times than the porous fibrous membranes(M–16).The results show apparent potential applications in wastewater/oil spill treatment as well as piezoelectric sensors.

关键词： poly(vinylidene fluoride) Porous fibrous membrane Metal removal Oil absorption and peak to peak output voltage

Sodium–gallium alloy layer for fast and reversible sodium deposition

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SusMat 2022年第6期2卷 699-707页

作者： Xiang Lv Fang Tang Yu Yao Chen Xu Dong Chen Lin Liu Yuezhan Feng Xianhong Rui Yan Yu guangdong provincial key laboratory on functional soft condensed matter School of Materials and EnergyGuangdong University of TechnologyGuangzhouChina Hefei National research center for Physical Sciences at the Microscale Department of Materials Science and EngineeringNational Synchrotron Radiation LaboratoryCAS Key Laboratory of Materials for Energy ConversionUniversity of Science and Technology of ChinaHefeiAnhuiChina Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhenChina key laboratory of materials Processing and Mold(Ministry of Education) Zhengzhou UniversityZhengzhouChina

Sodium metal has been regarded as the potential alternative for metal batter-ies owing to its advantages of high theoretical capacity and abundant reserves.Nevertheless,propagation of Na dendrites can boost the interfacial instability of Na metal,retarding its practical implementation.Thus,the Na–Ga alloy layer is designed and fabricated by in situ rolling of metal Ga on the surface of Na metal.This alloy layer possesses good sodiophilicity,which can effectively pro-tect Na metal and favor the uniform Na+deposition,obtaining the inhibition of Na dendrites growth.Consequently,the symmetric cells assembled by the alloy-layer protected Na metal electrodes(NGAL-Na||NGAL-Na)have a long lifetime(468 h)even under a high plating/stripping capacity of 6 mAh cm^(−2) in carbon-ate electrolyte.The full battery of NGAL-Na||Na 3 V 2(PO 4)3 is able to sustain an excellent rate capability of 100 mAh g−1 after 500 cycles at 10 C under ambi-ent temperature.This work provides a new route to prevent metal anodes from severe dendrite growth,and paves the way toward safer and stable-performing metal-based rechargeable batteries.

关键词： dendrite-free morphology Na-Ga alloy sodium metal anode

Enhanced electrocaloric effect at room temperature in Mn^(2+) doped lead-free(BaSr)TiO_(3) ceramics via a direct measurement

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Journal of Advanced Ceramics 2021年第3期10卷 482-492页

作者： Xiang NIU Xiaodong JIAN Xianyi CHEN Haoxuan LI Wei LIANG Yingbang YAO Tao TAO Bo LIANG Sheng-Guo LU guangdong provincial research center on smart materials and energy conversion devices Guangdong Provincial Key Laboratory of Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Dongguan South China Design Innovation Institute Dongguan 523808China

(Ba_(1-x)Sr_(x))(MnyTi1-y)O_(3)(BSMT)ceramics with x=35,40 mol%and y=0,0.1,0.2,0.3,0.4,0.5 mol%were prepared using a conventional solid-state reaction approach.The dielectric and ferroelectric properties were characterized using impedance analysis and polarization-electric field(P-E)hysteresis loop measurements,respectively.The adiabatic temperature drop was directly measured using a thermocouple when the applied electric field was removed.The results indicate that high permittivity and low dielectric losses were obtained by doping 0.1-0.4 mol%of manganese ions in(BaSr)TiO_(3)(BST)specimens.A maximum electrocaloric effect(ECE)of 2.75 K in temperature change with electrocaloric strength of 0.55 K·(MV/m)^(-1)was directly obtained at~21℃and 50 kV/cm in Ba_(0.6)Sr_(0.4)Mn_(0.001)Ti_(0.999)O_(3) sample,offering a promising ECE material for practical refrigeration devices working at room temperature.

关键词： barium strontium titanate ceramics permittivity dielectric loss electrocaloric effect electrocaloric strength

Large electrocaloric effect obtained in BaSn_(x)Ti_(1-x)O_(3) lead-free ceramics using direct and indirect measurements

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Journal of Advanced Dielectrics 2018年第5期8卷 64-69页

作者： Jiang Li Dan-Dan Li Biao Lu Ying-Bang Yao Tao Tao Bo Liang Wen-Hui Lu Ge-Li Luo Sheng-Guo Lu guangdong provincial research center on smart materials and energy conversion devices guangdong provincial key laboratory of functional soft condensed matter school of materials and energy Guangdong University of Technology Guangzhou 510006P.R.China

The electrocaloric effect(ECE)in lead-free BaSn_(x)Ti_(1-x)O_(3)(BSnT,x=0.05,0.10 and 0.15)ceramics were investigated using a direct ECE measurement.Results indicate that the maximum ECE occurs near the Curie temperature and it slightly shifts towards high temperatures.The directly measured ECE is larger than that calculated using the Maxwell relation and P-E loops.A maximum electrocaloric efficiencyΔT=ΔE=0.49-10-6 KmV-1 was procured for the composition with x=0.15 at T=299.2 K.And it also shows a broad peak in the temperature range of 250–320 K.

关键词： BaSnTiO_(3)ceramic direct measurement electrocaloric effect.

Designing artificial ion channels with strict K+/Na+ selectivity toward next-generation electric-eel-mimetic ionic power generation

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National Science Review 2023年第12期10卷 193-202页

作者： Jipeng Li Linhan Du Xian Kong Jianzhong Wu Diannan Lu Lei Jiang Wei Guo State key laboratory of Marine Resource Utilization in South China Sea School of Materials Science and Engineering Hainan University Department of Chemical Engineering Tsinghua University South China Advanced Institute for soft matter Science and Technology Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices School of Emergent Soft MatterSouth China University of Technology Department of Chemical and Environmental Engineering University of California research Institute for Frontier Science Beihang University center for Quantum Physics and Intelligent Sciences Department of Physics Capital Normal University

A biological potassium channel is> 1000 times more permeable to K+than to Na+and exhibits a giant permeation rate of ～108ions/s.It is a great challenge to construct artificial potassium channels with such high sele ctivity and ion conduction rate.Herein,we unveil a long-overlo oked structural feature that underpins the ultra-high K+/Na+selectivity.By carrying out massive molecular dynamics simulation for ion transport through carbonyl-oxygen-modified bi-layer graphene nanopores,we find that the twisted carbonyl rings enable strict potassium selectivity with a dynamic K+/Na+selectivity ratio of 1295 and a K+conduction rate of 3.5 × 107ions/s,approaching those of the biological counterparts.Intriguingly,atomic trajectories of K+permeation events suggest a dual-ion transport mode,i.***.two like-charged potassium ions are successively captured by the nanopores in the graphene bi-layer and are interconnected by sharing one or two interlayer water molecules.The dual-ion behavior allows rapid release of the exiting potassium ion via a soft knock-on mechanism,which has previously been found only in biological ion channels.As a proof-of-concept utilization of this discovery,we propose a novel way for ionic power generation by mixing KCl and NaCl solutions through the bi-layer graphene nanopores,termed potassium-permselectivity enabled osmotic power generation(PoPee-OP G).Theoretically,the biomimetic device achieves a very high power density of> 1000 W/m2with graphene sheets of <1% porosity.This study provides a blueprint for artificial potassium channels and thus paves the way toward next-generation electric-eel-mimetic ionic power generation.

关键词： artificial ion channel bi-layer graphene dehydrated ion transport bio-inspired materials energy conversion

The role of fluorescent carbon dots in crops:Mechanism and applications

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smartMat 2022年第2期3卷 208-225页

作者： Baoyan Guo Guo Liu Haopeng Wei Jiemin Qiu Jianle Zhuang Xuejie Zhang Mingtao Zheng Wei Li Haoran Zhang Chaofan Hu Bingfu Lei Yingliang Liu key laboratory for Biobased materials and energy of Ministry of Education/guangdong provincial Engineering Technology research center for Optical Agriculture College of Materials and EnergySouth China Agricultural UniversityGuangzhouChina College of Horticulture South China Agricultural UniversityGuangzhouChina

Fluorescent carbon dots(CDs)have been widely studied in biosensing,imaging,information encryption,and optoelectronic devices due to excellent optical properties,such as photostability,tunable luminescence range,and resistance to photobleaching.In recent years,CDs have been explored for use in agriculture.Based on their light harvest and light conversion capacity,as well as their characteristics of easy synthesis and low toxicity,CDs show great potential in improving crop photosynthesis.In addition,CDs can also be used for smart and anticounterfeiting packing,food safety detection,and preservation of crops after harvest.In this study,the application of CDs with excellent optical properties in crops has been summarized,including preharvest processes(photosynthesis and plant imaging),and postharvest processes(crop preservation and food safety).Then the toxicity of CDs to crops is introduced.Finally,the present challenges and future prospects are discussed.

关键词： carbon dots crops mechanism optical properties photosynthesis

Enhancement of solvent uptake in porous PVDF nanofibers derived by a water-mediated electrospinning technique

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Journal of Materiomics 2021年第2期7卷 244-253页

作者： Gajula Prasad Jun-Wei Liang Wei Zhao Yingbang Yao Tao Tao Bo Liang Sheng-Guo Lu guangdong provincial research center on smart materials and energy conversion devices Guangzhou510006China guangdong provincial key laboratory on the functional soft condensed matter Guangzhou510006China school of materials and energy Guangdong University of TechnologyGuangzhou510006China Dongguan South China Design Innovation Institute Building D-1University Innovation City AreaSongshan LakeDongguan523808China

The effect of a N,N-dimethylformamide(DMF)/acetone solvent system(3:7,4:6,5:5,6:4,7:3)and spinning medium(air and water)on the membrane morphology and the structure-property relationship were investigated.A facile method was optimized to generate a porous,polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone(4:6)solvent system in a water medium.The attenuated total reflection(ATR)-Fourier transform infrared(FTIR)results showed an increased b-phase compared to the pristine poly(vinylidene fluoride)(PVDF).The XRD and DSC results further confirmed that the co-existing a-and b-phases in the pristine PVDF were converted into a unique b-phase in the electrospun membranes.In addition,the solvent uptake percentage of the DMF/acetone(4:6)solvent system in a water medium(540)is much greater than that in an air medium(320),and over two times better than that of commercial polyethylene(PE)membranes(190).Similarly,the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone(4:6)solvent system in a water medium is higher than that of the air medium.This enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.

关键词： Polyvinylidene fluoride Electrospinning Thermally induced phase separation Viscosity Porous fibers Discharge capacity Solvent uptake

Reduced Ti-MOFs encapsulated black phosphorus with high stability and enhanced photocatalytic activity

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Journal of energy Chemistry 2021年第2期30卷 185-191,I0007页

作者： Xiao Liu Peijie Fan Liangping Xiao Jian Weng Qingchi Xu Jun Xu Department of Biomaterials College of Materials.Xiamen UniversityXiamen 361005Fujian.China Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional MaterialsXiamen UniversityXiamen 361005FujianChina Shenzhen research Institute of Xiamen University.Shenzhen 518057 GuangdongChina China State key Lab of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

The generation of green hydrogen(H_2) energy is of great significance to solve worldwide energy and environmental issues. Reduced Ti based photocatalyst has recently attracted intensive attention due to its excellent photocatalytic activity, while the synthesis of reduced Ti based photocatalysts with high stability is still a great challenge. Here, we report a facile method for synthesis of reduced Ti metal organic frameworks(small amounts of Pt incorporated) encapsulated BP(BP/R-Ti-MOFs/Pt) hybrid nanomaterial with enhanced photocatalytic activity. The strong interaction between Ti and P reduces the valence state of the binding Ti^(4+)on the BP surface, forming abundant reduced Ti^(4+)within R-Ti-MOFs/BP. Such reduced Ti^(4+)render R-Ti-MOFs/BP efficient charge transfer and excellent light absorption capability, thus promote the photocatalytic H_2 production efficiency. Furthermore, the Ti-P interaction stabilizes both reduced Ti^(4+)and BP during the photocatalytic reaction, which greatly enhanced the stability of the obtained BP/R-TiMOFs/Pt photocatalyst.

关键词： 2D materials Reduced Ti-MOFs Black phosphorus Photocatalysis Solar-to-hydrogen conversion Metal-organic frameworks

Hydrogel-elastomer-based stretchable strain sensor fabricated by a simple projection lithography method

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International Journal of smart and Nano materials 2021年第3期12卷 256-268页

作者： Zhenqing Li Xiangnan He Jianxiang Cheng Honggeng Li Yuan-Fang Zhang Xiaojuan Shi Kai Yu Hui Ying Yang Qi Ge Shenzhen key laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenChina guangdong provincial key laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and TechnologyShenzhenChina Digital Manufacturing and Design Centre Singapore University of Technology and DesignSingapore Department of Mechanical Engineering University of Colorado DenverDenverCOUSA National key laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinP.R.China

Stretchable strain sensor detects a wide range of strain variation and is therefore a key component in various applications.Unlike traditional ones made of elastomers doped with conductive components or fabricated with liquid conductors,ionically conductive hydrogel-based strain sensors remain conductive under large deformations and are biocompatible.However,dehydration is a challenging issue for the latter.researchers have developed hydrogel-elastomer-based strain sensors where an elastomer matrix encapsulates a hydrogel circuit to prevent its dehydration.However,the reported multistep approaches are generally time-consuming.Our group recently reported a multimaterial 3D printing approach that enables fast fabrication of such sensors,yet requires a self-built digital-light-processing-based multimaterial 3D printer.Here,we report a simple projection lithography method to fabricate hydrogel-elastomer-based stretchable strain sensors within 5 minutes.This method only requires a UV projector/lamp with photomasks;the chemicals are commercially available;the protocols for preparing the polymer precursors are friendly to users without chemistry background.Moreover,the manufacturing flexibility allows users to readily pattern the sensor circuit and attach the sensor to a 3D printed soft pneumatic actuator to enable strain sensing on the latter.The proposed approach paves a simple and versatile way to fabricate hydrogel-elastomer-based stretchable strain sensors and flexible electronic devices.

关键词： Ionically conductive hydrogel stretchable strain sensor projection lithography