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A Simple-Prepared and Multi-Reusable Adhesive Based on Epoxy Vitrimer

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Chinese Journal of Polymer Science 2024年第10期42卷 1589-1594,I0015页

作者： Yu-Ting Wang Huan Liang yen wei Jian-Long Wang Xiang-Ming He Yang Yang Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing100084China

Adhesives play an important role in modern society's production and daily *** robust and sustainable adhesives remains a great *** we report a sustainable epoxy-vitrimer adhesive with high adhesive strength(about 10 MPa)and reusability(82%strength after 3 times).This adhesive can be fabricated from commercially available products through a straightforward hot-pressing method without the need of *** adhesive process is also simple,requiring only 30 min at 180℃.In addition,the vitrimer adhesive has the advantages of both erasability for reuse and excellent water *** work provides a facile strategy to fabricate high-strength adhesive that ensures reusability,recyclability,low cost of raw materials,and simple processing ***,it expands the range of potential applications for epoxy vitrimers.

关键词： Epoxy Vitrimer Adhesive Reusable Sustainable

Robust zero-watermarking algorithm based on discrete wavelet transform and daisy descriptors for encrypted medical image

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CAAI Transactions on Intelligence Technology 2024年第1期9卷 40-53页

作者： Yiyi Yuan Jingbing Li Jing Liu Uzair Aslam Bhatti Zilong Liu yen-wei Chen School of Information and Communication Engineering Hainan UniversityHaikouChina Research Center for Healthcare Data Science Zhejiang LabHangzhouChina Graduate School of Information Science and Engineering Ritsumeikan University ShigaJapan

In the intricate network environment,the secure transmission of medical images faces challenges such as information leakage and malicious tampering,significantly impacting the accuracy of disease diagnoses by medical *** address this problem,the authors propose a robust feature watermarking algorithm for encrypted medical images based on multi-stage discrete wavelet transform(DWT),Daisy descriptor,and discrete cosine transform(DCT).The algorithm initially encrypts the original medical image through DWT-DCT and Logistic ***,a 3-stage DWT transformation is applied to the encrypted medical image,with the centre point of the LL3 sub-band within its low-frequency component serving as the sampling *** Daisy descriptor matrix for this point is then ***,a DCT transformation is performed on the Daisy descriptor matrix,and the low-frequency portion is processed using the perceptual hashing algorithm to generate a 32-bit binary feature vector for the medical *** scheme utilises cryptographic knowledge and zero-watermarking technique to embed watermarks without modifying medical images and can extract the watermark from test images without the original image,which meets the basic re-quirements of medical image *** embedding and extraction of water-marks are accomplished in a mere 0.160 and 0.411s,respectively,with minimal computational *** results demonstrate the robustness of the algorithm against both conventional attacks and geometric attacks,with a notable performance in resisting rotation attacks.

关键词： daisy descriptor DCT DWT encryption domain medical image zero-watermarking

Enhancing the Electrocatalytic Oxidation of 5-Hydroxymethylfurfural Through Cascade Structure Tuning for Highly Stable Biomass Upgrading

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Nano-Micro Letters 2024年第12期16卷 449-467页

作者： Xiaoli Jiang Xianhui Ma Yuanteng Yang Yang Liu Yanxia Liu Lin Zhao Penglei Wang Yagang Zhang Yue Lin yen wei School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731People’s Republic of China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026People’s Republic of China The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084People’s Republic of China School of Materials Science and Engineering North Minzu UniversityYinchuan 750021People’s Republic of China

Electrocatalytic 5-hydroxymethylfurfural oxidation reaction(HMFOR)provides a promising strategy to convert biomass derivative to highvalue-added ***,a cascade strategy is proposed to construct Pd-NiCo_(2)O_(4)electrocatalyst by Pd loading on Ni-doped Co3O4 and for highly active and stable synergistic HMF *** elevated current density of 800 mA cm^(-2)can be achieved at 1.5 V,and both Faradaic efficiency and yield of 2,5-furandicarboxylic acid remained close to 100%over 10 consecutive *** and theoretical results unveil that the introduction of Pd atoms can modulate the local electronic structure of Ni/Co,which not only balances the competitive adsorption of HMF and OH-species,but also promote the active Ni^(3+)species formation,inducing high indirect oxidation *** have also discovered that Ni incorporation facilitates the Co2+pre-oxidation and electrophilic OH*generation to contribute direct oxidation *** work provides a new approach to design advanced electrocatalyst for biomass upgrading.

关键词： 5-Hydroxymethylfurfural oxidation reaction Competitive adsorption Cascade strategy Elevated current density

Regulating Actuations and Shapes of Liquid Crystal Elastomers through Combining Dynamic Covalent Bonds with Cooling-Rate-Mediated Control

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Chinese Journal of Polymer Science 2024年第10期42卷 1442-1448,I0008页

作者： Ya-Wen Liu Huan Liang Hong-Tu Xu En-Jian He Zhi-Jun Yang Yi-Xuan Wang yen wei Zhen Li Yan Ji The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing100084China Advanced Materials and Energy Center Academy of Aerospace Science and InnovationBeijing100088China

Realizing multiple locked shapes in pre-oriented liquid crystal elastomers(LCEs)is highly desired for diversifying deformations and enhancing ***,conventional LCEs only deform between two shapes for each actuation cycle upon liquid crystal-isotropic phase transitions induced by external ***,we propose to regulate the actuation modes and the locked shapes of a pre-orientated epoxy LCE by combining dynamic covalent bonds with cooling-rate-mediated *** actuation modes can be adjusted on demand by exchange reactions of dynamic covalent *** from the established actuation modes,such as elongation,bending,and spiraling,the epoxy LCE displays varied locked shapes at room temperature under different cooling *** mediums are utilized to control the cooling rate,including water,silicone oil,and copper *** approach provides a novel way for regulating the actuation modes and locked shapes of cuttingedge intelligent devices.

关键词： Liquid crystal elastomer Epoxy Dynamic covalent bond Vitrimer Cooling rate

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铜离子荧光探针设计及识别机制的研究进展

中国材料进展 2024年第6期43卷 533-542页

作者：裴杨澜胡堃王峻东李路海危岩北京印刷学院印刷与包装工程学院北京102600 中南大学化学化工学院湖南长沙410083 清华大学化学系北京100084

铜(Cu)是人体内仅次于铁(Fe)和锌(Zn)的第三大丰富元素,也是生命不可或缺的组成部分,但过量摄入Cu会损伤红细胞和神经系统。因此,铜离子(Cu^(2+))的检测在生物医学和环境领域越来越受到重视。在众多Cu^(2+)的检测方法中,荧光探针具有操... 详细信息

铜(Cu)是人体内仅次于铁(Fe)和锌(Zn)的第三大丰富元素,也是生命不可或缺的组成部分,但过量摄入Cu会损伤红细胞和神经系统。因此,铜离子(Cu^(2+))的检测在生物医学和环境领域越来越受到重视。在众多Cu^(2+)的检测方法中,荧光探针具有操作方便、灵敏度高且适用于环境和细胞检测等优点,可以对细胞及生物体中的Cu^(2+)进行动态标记,实现实时生物成像,具有广阔的研发前景。归纳总结了近5年用于Cu^(2+)检测的荧光探针的研究进展,根据对Cu^(2+)识别机制的不同,对此类荧光探针进行分类,阐述了Cu^(2+)探针的分子结构和使用性能,并对进一步优化Cu^(2+)荧光探针的发光性质和检测限提出了展望。

关键词：荧光探针铜离子识别机制生物成像

Recent Advances and Progress for the Fabrication and Surface Modification of AIE-active Organic-inorganic Luminescent Composites

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Chinese Journal of Polymer Science 2019年第4期37卷 340-351,I0005页

作者： Liu-Cheng Mao Xiao-Yong Zhang yen wei Department of Chemistry Nanchang University Department of Chemistry and the Tsinghua Center for Frontier Polymer Research Tsinghua University Department of Chemistry and Center for Nanotechnology and Institute of Biomedical Technology Chung-Yuan Christian University

Organic dyes based hybrid organic-inorganic luminescent nanomaterials with high quantum efficiency, good physical or chemical stability, and favorable biocompatibility, have attracted growing attention recently because of their important applications in the areas of biomedical imaging, chemical sensors, and light-emitting diodes(LEDs). Nevertheless, conventional fluorescence molecules suffer from aggregation-caused quenching(ACQ) when they are doped into inorganic nanomaterials. Aggregation-induced emission(AIE) is an abnormal and intriguing fluorescent phenomenon that has aroused increasing interest for various applications especially in biomedical fields. Compared with conventional organic dyes, the AIE-active molecules will emit more intense fluorescence in their aggregates or solid states. It provides an elegant route to overcome the drawbacks of conventional organic molecules. Over the past few decades, the fabrication and surface modification of various organic-inorganic luminescent composites doped with AIE-active molecules have been reported. Therefore, it is highly desirable to summarize these advances. In this review, recent advances and progress in constructing various AIEgens-doped organic-inorganic hybrid nanocomposites and their subsequent surface modification were summarized. We hope this review could further promote the research of AIE-active functional materials.

关键词： Aggregation-induced emission Organic-inorganic luminescent composites Surface modification Biomedical applications

Photo-responsive liquid crystalline vitrimer containing oligoanilines

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Chinese Chemical Letters 2017年第11期28卷 2139-2142页

作者： Qiaomei Chen yen wei Yan Ji MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology Department of Chemistry Tsinghua University Beijing 100084 China

Liquid crystalline vitimers （LC-vitrimers） can be easily processed into complex three-dimensional configurations. In this paper, we present a photo-responsive LC-vitrimer by simply introducing a photo- thermal agent aniline trimer into the LC-vitrimer system. As aniline trimer acts as a curing agent, it can be homogeneously dispersed in the material, avoiding aggregation which commonly happens to nano- fillers. As a result, the resultant polymer not only can perform three light-controlled functions （welding, healing and shape memory）, but also can be prepared into aligned monodomain LC actuators with strains of about 40%-45%.

关键词： Liquid-crystalline elastomers Oligoanilines Transesterification Photo-thermal effect Actuators

Feather-like NiCo2O4 self-assemble from porous nanowires as binder-free electrodes for low charge transfer resistance

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Frontiers of Materials Science 2020年第4期14卷 450-458页

作者： Dandan HAN Jinhe wei Shanshan WANG Yifan PAN Junli XUE yen wei College of Chemistry and Pharmaceutical Engineering Jin Institute of Chemical TechnologyJilin 132022China Department of Chemistry and the Tsinghua Center for Frontier Polymer Research Tsinghua UniversityBeiing 100084China

The unique feather-like arrays composing of ultrathin secondary nanowires are fabricated on nickel foam(NF)through a facile hydrothermal ***,the enhancement of electrochemical properties especially the low charge transfer resistance strongly depends on more active sites and porosity of the *** from the unique structure,the optimized NiCo2O4 electrode delivers a significantly lower charge transfer resistance of 0.32Ω and a high specific capacitance of450 Fg^-1 at 0.5 A.g^-1,as well as a superior cycling stability of 139.6%capacitance *** improvement of the electrochemical energy storage property proves the potential of the fabrication of various binary metal oxide electrodes for applications in the electrochemical energy field.

关键词： feather-like NiCo2O4 binder-free electrode charge transfer resistance supercapacitor

“Living”fluorophores:thermo-driven reversible ACQ-AIE transformation and ultra-sensitive in-situ monitor for dynamic Diels-Alder reactions

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Science China Chemistry 2022年第8期65卷 1532-1537页

作者： Danning Hu Hongye Huang Ruoxin Li Jinying Yuan yen wei Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084China Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Organic fluorophores play essential roles in both academic and applied *** of the fluorescent molecules can be divided into aggregation-caused quenching(ACQ)and aggregation-induced emission(AIE)types based on the diverse emission properties in solution and aggregated ***,a large part of studies focuses on the ACQ-to-AIE one-way transformation and the complex synthesis of chemical bonds is inevitable in all existing *** maximize the advantages of ACQ and AIE types fluorophores and avoid complex chemosynthesis,we propose a facile strategy first realizing the reversible ACQAIE transformation with the dynamic Diels-Alder(DA)***,the fluorescent platform can monitor DA reactions in microscale ultra-sensitively and *** dynamic covalent bonds can help to develop novel fluorophores creatively,and the reversible ACQ-AIE platform is expected to offer fresh insights into the dynamic covalent chemistry.

关键词： Diels-Alder reaction dynamic covalent chemistry aggregation-induced emission aggregation-caused quenching fluorescence sensor reaction monitor