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Science Bulletin 2024年第12期69卷 1875-1886页

作者：贾宇杰管清宝储成臻张璐之 Rasoul Esmaeely Neisiany 顾士甲孙俊芬游正伟 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringResearch Base of Textile Materials for Flexible Electronics and Biomedical Applications(China Textile Engineering Society)Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineDonghua UniversityShanghai 201620China Biotechnology Centre Silesian University of TechnologyGliwice 44-100Poland Department of Polymer Engineering Hakim Sabzevari UniversitySabzevar ***Iran

There is usually a trade-off between high mechanical strength and dynamic self-healing because the mechanisms of these properties are mutually ***,we design and fabricate a fluorinated phenolic polyurethane(FPPU)elastomer based on octafluoro-4,4'-biphenol to overcome this *** fluorine-based motif not only tunes interchain interactions throughπ-πstacking between aromatic rings and free-volume among polymer chains but also improves the reversibility of phenol-carbamate bonds via electron-withdrawing effect of fluorine *** developed FPPU elastomer shows the highest recorded puncture energy(648.0 m J),high tensile strength(27.0 MPa),as well as excellent selfhealing efficiency(92.3%),along with low surface energy(50.9 MJ m^(-2)),notch-insensitivity,and reprocessability compared with non-fluorinated counterpart biphenolic polyurethane(BPPU)*** advantage of the above-mentioned merits of FPPU elastomer,we prepare an anti-fouling triboelectric nanogenerator(TENG)with a self-healable,and reprocessable elastic *** from stronger electron affinity of fluorine atoms than hydrogen atoms,this electronic device exhibits ultrahigh peak open-circuit voltage of 302.3 V compared to the TENG fabricated from BPPU ***,a healable and stretchable conductive composite is *** research provides a distinct and general pathway toward constructing high-performance elastomers and will enable a series of new applications.

关键词： Fluorinated elastomer Polyurethane Phenol-carbamate bonds Self-healing Reprocessable

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Sintering and mechanical properties of carbon bulks from ordered mesoporous carbon and nano diamond

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Journal of Advanced Ceramics 2022年第11期11卷 1815-1823页

作者： Bowen MIAO Junzhuo WANG Jianlin LI shijia gu Lianjun WANG Wan JIANG State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China

Powder metallurgy is important in material *** to the inertness of carbon materials,however,sintering powdered carbon into physically coherent bulks has been a great challenge even at a high temperature(2000).Improving the sintering activity of carbon powders is℃the key to the success of the consolidation of the carbon *** ordered mesoporous carbon(OMC)is used as the starting material to produce highly homogeneous novel carbon *** sintering at 1800,the huge specific surface area of the OMC greatly promotes the migration of℃carbon atoms and thus the sintering of the OMC by surface diffusion *** nanodiamond(ND)is added,the volume expansion associated with the phase transformation of diamond to graphite facilitates the densification of the powder *** strong connection between the OMC and the graphite onions derived from the ND bestows the as-prepared carbon bulks with excellent mechanical *** current research pioneers a novel way to prepare high-strength carbon materials at relatively low temperatures.

关键词： mesoporous carbon nanodiamond(ND) carbon material high strength

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Solvent-Free Synthesis of Self-Healable and Recyclable Crosslinked Polyurethane Based on Dynamic Oxime-Urethane Bonds

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Chinese Journal of Polymer Science 2023年第11期41卷 1725-1732,I0007页

作者： Yuepeng Wang Lei Yang Luzhi Zhang Hongfei Huang Bo Qian shijia gu Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Polyurethane is widely used for its versatility in design and range of ***-healing and recyclable dynamic polyurethane networks have attracted extensive attention due to their potential to extend service life and ensure safety in use,as well as to promote sustainable use of *** green and environment-friendly methods to obtain this material is an interesting and challenging task,as the majority of current dynamic polyurethane networks utilize the solution polymerization *** use of solvents makes the processes complicated,harmful to environment,and increase the ***(oxime-urethanes)(POUs)are emerging dynamic polyurethanes and show great potential in diverse fields,such as biomaterials,hot melt adhesives,and flexible *** this study,we utilized the solubility properties of dimethylglyoxime in raw material poly(ethylene glycol)to prepare POUs through bulk polymerization for the first *** method is simple,convenient and ***,copper ion coordination improves POUs strength and dynamic properties,with mechanical strength up from 0.54 MPa to 1.03 MPa and self-healing recovery rate up from 85.5%to 91.8%,and activation energy down from 119.6 k J/mol to 95.4 k J/*** demonstrate the application of this technology,self-healing and stretchable circuits are constructed from this dynamic polyurethane network.

关键词： Polyurethane Dynamic covalent bonds Oxime-urethane bonds Self-healing Recycle

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In-situ growth of carbon nanotubes on ZnO to enhance thermoelectric and mechanical properties

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Journal of Advanced Ceramics 2022年第12期11卷 1932-1943页

作者： Shengjie FAN Tingting SUN Meng JIANG shijia gu Lianjun WANG Haixue YAN Wan JIANG State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK

As a high-temperature thermoelectric(TE)material,ZnO offers advantages of non-toxicity,chemical stability,and oxidation resistance,and shows considerable promise as a true ready-to-use module under air ***,poor electrical conductivity and high thermal conductivity severely hinder its *** nanotubes(CNTs)are often used as a reinforcing phase in composites,but it is difficult to achieve uniform dispersion of CNTs due to van der Waals ***,we developed an effective in-situ growth strategy of homogeneous CNTs on ZnO nanoparticles by exploiting the chemical vapor deposition(CVD)technology,in order to improve their electrical conductivity and mechanical properties,as well as reducing the thermal ***,magnetic nickel(Ni)nanoparticles are introduced as catalysts for promoting the formation of CNTs,which can also enhance the electrical and thermal transportation of ZnO ***,the electrical conductivity of ZnO is significantly boosted from 26 to 79 S·cm^(−1) due to the formation of dense and uniform conductive CNT *** lattice thermal conductivity(κ_(L))is obviously declined by the intensification of phonon scattering,resulting from the abundant grain boundaries and interfaces in ZnO-CNT ***,the maximum dimensionless figure of merit(zT)of 0.04 at 800 K is obtained in 2.0%Ni-CNTs/ZnO,which is three times larger than that of CNTs/ZnO prepared by traditional ultrasonic *** addition,the mechanical properties of composites including Vickers hardness(HV)and fracture toughness(K_(IC))are also *** work provides a valuable reference for dispersing nano-phases in TE materials to enhance both TE and mechanical properties.

关键词： ZnO carbon nanotubes(CNTs) in-situ grown thermoelectric(TE) mechanical properties

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A topological polymer network with Cu(Ⅱ)-coordinated reversible imidazole-urea locked unit constructs an ultra-strong self-healing elastomer

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Science China Chemistry 2023年第3期66卷 853-862页

作者： Lei Yang Zenghe Liu Rasoul Esmaeely Neisiany Jiaming Lou Yifan guo Luzhi Zhang Huijie Liu Shuo Chen shijia gu Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevar ***Iran Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China

It is exceedingly desired, but difficult to construct self-healing materials with both excellent mechanical properties and healing efficiency, which are usually realized by using mutually exclusive methods. Here, we reconcile this contradiction by utilizing copper-bis-(imidazole-2-yl)-methane-urea(Cu-BIMU) locked units based on novel designed dynamic imidazole-urea bonds with coupled multiple noncovalent bonds(coordination bonds, π-π stacking bonds, and hydrogen bonds). The coordination of Cu(II) greatly reduces the electron-cloud density of imidazole, which lowers the free energy barrier of imidazole-urea bonds and promotes their reversible dissociation, as demonstrated by the density functional theory and small-molecule model reaction. The topological design of Cu-BIMU polyurethane(Cu-BIMU-PU), which concentrates multiple crosslinking-in-one locked unit to avoid the formation of excessive crosslinking sites to ensure high chain mobility, facilitates self-healing. Accumulative extensive intermolecular interactions endowed excellent mechanical properties to the resulting Cu-BIMU-PU elastomer with a tensile strength of 65.3 MPa, among the highest ever-reported value. This work provides a novel molecular design principle for fabricating high-performance dynamic polymers.

关键词： topological polymer network self-healing elastomer urea bonds

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Enhanced thermoelectric performance of hydrothermally synthesized polycrystalline Te-doped SnSe

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Chinese Chemical Letters 2021年第2期32卷 811-815页

作者： Pei Li Xin Ai Qihao Zhang shijia gu Lianjun Wang Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China College of Information Science and Technology Donghua University.Shanghai 201620China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences.Beijing 100049China Institute of Functional Materials Donghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationShanghai 201620China

In this study,large-scale Te-doped polycrystalline SnSe nanopowders were synthesized by a facile hydrothermal approach and the effect of Te doping on the thermoelectric properties of SnSe was fully *** is found that the carrier concentration increases due to the reduction of band gap by alloying with Te,which contributes to significant enhancement of electrical conductivity especially at room *** with the moderated Seebeck coefficient,a high power factor of 4.59μW cm 1 K 2 is obtained at 773 ***,the lattice the rmal conductivity is greatly reduced upon Te substitution owing to the atomic point defect *** from the synergistically optimized both electrical-and thermal-transport properties by Te-doping,thermoelectric performance of polycrystalline SnSe is enhanced in the whole temperature range with a maximum ZT of-0.79 at a relatively low temperature(773 K) for *** study provides a low-cost and simple lowtemperature method to mass production of SnSe with high thermoelectric performance for practical applications.

关键词： Polycrystalline SnSe Hydrothermal synthesis Thermoelectric Te doping

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Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi2Te3

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Journal of Advanced Ceramics 2020年第4期9卷 424-431页

作者： Xiaolei Shi Xin Ai Qihao Zhang Xiaofang Lu shijia gu Li Su Lianjun Wang Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China College of Information Science and Technology Donghua UniversityShanghai201620China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Institute of Functional Materials Donghua UniversityShanghai201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationShanghai201620China

N-type Se&Lu-codoped Bi2Te3 nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense *** further doping Se element into Lu-doped Bi2Te3 samples,the thickness of the nanosheets has the tendency to become *** electrical conductivity of Lu0.1Bi1.9Te3−xSex material is reduced with the increasing Se content due to the reduced carrier concentration,while the Seeback coefficient values are *** lattice thermal conductivity of the Lu0.1Bi1.9Te3−xSex is greatly reduced due to the introduced point defects and atomic mass ***,the Lu0.1Bi1.9Te2.7Se0.3 sample obtained a maximum ZT value of 0.85 at 420 *** study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi2Te3 with high thermoelectric performance for practical applications.

关键词： thermoelectric material n-type bismuth telluride hydrothermal synthesis co-doping

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Enhanced TE properties of Cu@Ag/Bi2Te3 nanocomposites by decoupling electrical and thermal properties

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Chinese Chemical Letters 2020年第3期31卷 880-884页

作者： Xiaofang Lu Qi Zheng shijia gu Rui guo Li Su Jiancheng Wang Zhenxing Zhou Yuchi Fan Wan Jiang Lianjun Wang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China School of Material Science and Engineering Jingdezhen Ceramic InstituteJindezhen 333000China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationShanghai 201620China

Cu@Ag/Bi2Te3 nanocomposites were prepared for the first time by ultrasonic dispersion-rapid freezedrying method combined with spark plasma sintering(SPS).By changing the content of Cu@Ag nanoparticle,we could modulate the temperature dependent thermoelectric *** highest ZT value can be obtained at 450 K for 1 vol%Cu@Ag/Bi2Te3,which is benefited from the decoupling of electrical and thermal *** the increase of electrical conductivity,the absolute value of Seebeck coefficient lifts while the thermal conductivity ***,the average ZT value between 300 K and 475 K was 0.61 for 1 vol%Cu@Ag/Bi2Te3,which is much higher than that of pristine Bi2 ***,the decoupling effect of Cu@Ag nanoparticles incorporation could be a promising method to broaden the application of Bi2Te3 based thermoelectric materials.

关键词： Cu@Ag Thermoelectric Bi2Te3 ZT Decoupling effect

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基于残差时序卷积网络的水声通信信号模式识别

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无线电工程 2024年第2期54卷 473-482页

作者：陈双双顾师嘉李娜娜吴玉泉中国海洋大学电子工程学院山东青岛266100 中国科学院软件研究所北京100190

水下通信信号模式识别是非合作水下通信信号识别中的关键一步,然而,水声信道的复杂多变给水下通信信号模式识别带来了很大挑战。针对传统算法模型复杂度高、提取特征多的问题,提出了一种残差网络和时序卷积网络相结合的残差时序卷积网络... 详细信息

水下通信信号模式识别是非合作水下通信信号识别中的关键一步,然而,水声信道的复杂多变给水下通信信号模式识别带来了很大挑战。针对传统算法模型复杂度高、提取特征多的问题,提出了一种残差网络和时序卷积网络相结合的残差时序卷积网络(Residual Temporal Convolutional Network,ResTCN)通信信号模式识别模型。该模型结构简单、网络收敛速度较快且具有较好的鲁棒性。通过实验仿真和海上试验对模型进行验证,在信噪比(Signal to Noise Ratio,SNR)大于-10 dB时,该方法在测试数据集上分类正确率为95%,在海试数据上正确率可达到93.5%。

关键词：水声通信调制模式识别时序卷积网络残差网络短时傅里叶变换

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透明、可拉伸和抗冻的杂化双网络有机水凝胶

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Science China Materials 2022年第8期65卷 2207-2216页

作者：朱李伟徐静宋建春秦明林顾士甲孙巍游正伟 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Lowdimension Materials(Donghua University)Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineResearch Base of Textile Materials for Flexible Electronics and Biomedical Applications(China Textile Engineering Society)College of Materials Science and EngineeringInstitute of Functional MaterialsDonghua UniveristyShanghai 201620China AccuPath Medical(Jiaxing)Co. Ltd.Shanghai 201203China

柔性电子产品非常需要具有高透明度和出色回弹性的可拉伸离子导体,但传统的离子导电水凝胶易于干燥和冻结.在此,基于独特的物理和共价杂化交联机制,我们提出了一种新的杂化交联策略,用海藻酸钠(SA)和丙烯酰胺(AM)制备可拉伸和透明的水凝... 详细信息

柔性电子产品非常需要具有高透明度和出色回弹性的可拉伸离子导体,但传统的离子导电水凝胶易于干燥和冻结.在此,基于独特的物理和共价杂化交联机制,我们提出了一种新的杂化交联策略,用海藻酸钠(SA)和丙烯酰胺(AM)制备可拉伸和透明的水凝胶(SPH),并通过简单的溶剂置换方法将其转化为有机水凝胶.所得SA-PAM-有机水凝胶(SPOH)表现出出色的综合性能,如优异的抗冻性能(−20℃)、高稳定性(>2天)、高透明度、优异的可拉伸性(~1600%)和高离子电导率(17.1 mS cm^(−1)).因此,由SPOH构筑的摩擦纳米发电机(O-TENG)在10 MΩ的负载下显示出262 mW m−2的瞬时峰值功率密度,并且能有效地收集人体运动产生的机械能来驱动电子手表和发光二极管.此外,O-TENG表现出良好的长期稳定性(2周)和温度耐受性(−20℃).另外,该原料可以通过简单的管状模具法制备成柔性有机水凝胶纤维,该纤维具有高透明度,可用于传输激光.该多功能有机水凝胶具有能量收集和激光传输的应用前景,有望用于可穿戴电子和生物医学领域.

关键词：高透明度回弹性发光二极管水凝胶离子电导率离子导体柔性电子可拉伸

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