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Monomer and Excimer Emission in a Conformational and Stacking-Adaptable Molecular System

Angewandte Chemie 2022年第4期135卷

作者： Xueru Shan Weijie Chi Hengbing Jiang Zhangyuan Luo Prof. Cheng Qian Prof. Hongwei Wu Prof. Yanli Zhao State Key Laboratory for Modification of Chemical Fiber and Polymer Materials Key Lab of Science and Technology of Eco-Textile Ministry of Education College of Chemistry and Chemical Engineering Donghua University Shanghai 201620 China Department of Chemistry School of Science Hainan University Haikou 570228 China School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637371 Singapore

A design strategy that combines molecular conformation, alkyl chain length, and charge-transfer effects has been developed to obtain conformational and stacking-adaptable donor-acceptor-π type molecules for precisely regulating the monomer and excimer emission in a single luminous platform under different environments. These fluorophores can exhibit bright monomer emissions when they are in the dispersed state based on their planar conformation. However, when the luminous molecules with short alkyl side chains are in the crystalline state, their molecular conformation can become distorted, further inducing strong intermolecular interactions and staggered π-π stacking for bright excimer emission. More importantly, their dispersed and aggregated states can be reversibly regulated in a phase-change fatty acid matrix, to achieve temperature-responsive fluorescence for temperature monitoring and advanced information encryption.

关键词： Aggregated State Conformational Flexibility Dispersed State Monomer-Excimer Fluorescence Temperature Responsivity

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Vibration-Regulated Multi-State Long-Lived Emission from Star-Shaped Molecules

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Angewandte Chemie 2022年第48期134卷

作者： Yiran Li Dr. Glib V. Baryshnikov Dr. Farhan Siddique Dr. Peng Wei Prof. Hongwei Wu Prof. Tao Yi State Key Laboratory for Modification of Chemical Fiber and Polymer Materials Key Lab of Science and Technology of Eco-Textile Ministry of Education College of Chemistry and Chemical Engineering Donghua University Shanghai 201620 China State Key Laboratory of Molecular Engineering of Polymers Department of Chemistry Fudan University Shanghai 200433 China Laboratory of Organic Electronics Department of Science and Technology Linköping University 60174 Norrköping Sweden

How to utilize molecular vibration to tune triplet-involved emissions in multiple states is highly challenging. Here, star-shaped triphenylamine derivatives have been employed as model systems to understand how molecular vibration affects thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) emissions in multiple states. Nonplanar, star-shaped conformations allow molecules to generate appropriate vibrations in the solution state, facilitating vibronic coupling between their T 1 and T 2 states to generate effective TADF. More importantly, a relatively dispersed state can allow the molecules to efficiently vibrate in the solid state, and a crystalline environment further promotes a more efficient TADF. Lastly, by suppressing molecular vibration to inhibit the TADF, ultra-long RTP was observed upon doping these molecules into polymers. These molecules can be used in information encryption and storage as well as bioimaging.

关键词： Anti-Counterfeiting Bioimaging Room Temperature Phosphorescence Thermal Activation Delayed Fluorescence Vibronic Coupling

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Electrospinning and electrospun nanofibers: From academic research to industrial production

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Progress in Materials science 2025年 154卷

作者： Wang, Ce Wang, Wei Qi, Hongxu Dai, Yunqian Jiang, Shaohua Ding, Bin Wang, Xianfeng Li, Congju Zeng, Jinfeng Wu, Tong Li, Haoyi Wang, Yuanfei Zhao, Yong Wang, Wenli Li, Zhenyu Mo, Xiumei Hou, Haoqing Dong, Lijie Ma, Hongyang Liu, Yong Su, Chunlei Bai, Jie Wu, Weiwei Guo, Gang Nie, Guangdi Wang, Nü Zhu, Han Bai, Jing Fang, Jian Liang, Daxin Ba, Zhichen Han, Guangping Lu, Xiaofeng Wang, Kaizhong Zhang, Xiaoyong Kang, Weimin Deng, Nanping Hu, Wei Chen, Weihua Zhang, Xiuling Yang, Dongzhi Wang, Fengyun Bian, Ye Liu, Zi'ang Zhang, Liang Li, Xiang Li, Lei Li, Yongxin Huang, Hui Jia, Xiaoteng Li, Xiaofeng Yang, Daxiang Jin, Xianchang Li, Shiyang Zhang, Xindan Tang, Nan Hao, Ruinan Tian, Feng Mai, Liqiang Wei, Yen Xue, Jiajia Alan G. MacDiarmid Institute Jilin University Changchun130012 China Harbin Institute of Technology Harbin150001 China Tsinghua University Beijing100084 China Southeast University Nanjing211189 China Nanjing Forestry University Nanjing210037 China Donghua University Shanghai201620 China Qingdao University Qingdao266071 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Qingdao Stomatological Hospital Affiliated to Qingdao University Qingdao260001 China School of Chemistry Beihang University Beijing100191 China College of Textile and Clothing Engineering Jiangsu Engineering Research Center of Textile Dyeing and Finishing for Energy Conservation Discharge Reduction and Cleaner Production National Engineering Laboratory for Morden Silk Soochow University Suzhou215123 China Southwest Petroleum University Chegdu610500 China Jiangxi Normal University Nanchang330022 China Wuhan University of Technology Wuhan430070 China Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Inner Mongolia University of Technology Hohhot010051 China Xidian University Xian710071 China Sichuan University Chengdu610065 China Beihang University Beijing100191 China Jiangnan University Wuxi214122 China Northeast Forestry University Harbin150040 China Jilin University Changchun130012 China First Hospital of Jilin University Changchun130031 China Nanchang University Nanchang330031 China Tiangong University Tianjin300387 China Northeast Normal University Changchun130024 China Zhengzhou University Zhengzhou450001 China University of Science and Technology Beijing Beijing100083 China Co. Ltd. Chongqing404617 China Beijing Guo Wei Na Research Center for Fiber Materials Beijing China Shanghai University Shanghai200444 China South China University of Technology Guangzhou510006 China State Key Laboratory of Advanced Technology for Materials Synthesis and Pr

Electrospinning is a versatile and rapidly evolving technique that has gained significant attention for its ability to produce nanofibers with unique structures and properties. Over the past few decades, the scope of electrospun nanofibers has expanded from simple polymer fibers to more complex composites and ceramics, enabling a wide range of applications across fields such as environmental protection, biomedical engineering, energy storage, and smart materials. This review provides a comprehensive overview of recent advancements, covering material selection, process optimization, and innovative applications. We discuss the unique structural features of electrospun nanofibers, including their tunable diameters, porous architectures, and diverse compositions, which underpin their multifunctionality. Key applications are highlighted in areas including environmental protection and safety, biomedical engineering, energy storage and conversion, and catalysis, as well as emerging uses in flexible electronics, advanced engineering materials, and textiles. Additionally, we review state-of-the-art characterization techniques and discuss the challenges and opportunities involved in scaling up industrial production. Finally, we offer a forward-looking perspective on the future of electrospun nanofibers, emphasizing the need for continued innovation in both academic research and commercial applications. © 2025 Elsevier Ltd

关键词： Medical applications

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Synthesis, Characterization, and Cytotoxic Activity of Stable Selenium Nanoparticles-Incorporated Carboxymethylcellulose Solution

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polymers for Advanced Technologies 2025年第6期36卷

作者： Turakulov Fozil Mamarayim Ugli Yunusov Khaydar Ergashovich Sarymsakov Abdushkur Abdukhalilovich Аtakhanov Abdumutolib Abdupatto Ugli Guohua Jiang Rui Wang Yi Wan Somia Yassin Hussain Abdalkarim Xakimov Ziyoviddin Zaynidinovich Raxmanov Alisher Xudoyberdiyevich Turakulov Mamarayim Ignatovich Zhanna Vladimirovna Rogachev Alexandr Alexandrovich Key Laboratory of Cellulose and Its Derivatives Chemistry and Technology Institute of Polymer Chemistry and Physics Academy of Sciences of the Republic of Uzbekistan Tashkent Uzbekistan Key Laboratory of Biological Composite Fiber Materials and Functional Devices School of Materials Science and Engineering Hangzhou China Key Laboratory of Marine Resource Utilization in South China Sea School of Biomedical Engineering Hainan University Haikou China Key Laboratory of Advanced Textile Materials and Manufacturing Technology Zhejiang Sci-Tech University Hangzhou China Key Laboratory of Pharmaco-Toxicological Research Tashkent Medical Academy Tashkent Uzbekistan Faculty of Production Technologies Gulistan State University Uzbekistan Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus Minsk Belarus

Selenium nanoparticles (SeNPs) have attracted considerable attention in biomedical research due to their antioxidant properties and potential therapeutic applications. In this study, selenium nanoparticles (SeNPs) were synthesized from sodium selenite (Na 2 SeO 3 ) using ascorbic acid as a reducing agent and sodium carboxymethylcellulose (Na-CMC) as an environmentally friendly stabilizer. Fourier-transform infrared spectroscopy (FTIR) confirmed ion-dipole and hydrogen bonding interactions between SeNPs and functional groups of Na-CMC spectra at 1601 and 3426 cm −1 . Besides, dynamic light scattering (DLS) and zeta potential measurements demonstrated the stability of SeNPs with ζ = − 40.5 mV in solution over extended storage periods till 672 h. Scanning electron microscopy (SEM) analysis revealed a correlation between precursor concentration of Na 2 SeO 3 (0.0165–0.122 wt%), spherical nanoparticle size (5–40 nm and 15–75 nm), and morphology. Remarkably, the obtained SeNPs exhibited lower acute toxicity at different doses (0.076 and 0.220 mg/mL) and higher LD 50 values (maximum 2005.36 and 1405.31 mg/kg) than SeO 3 2− ions demonstrated via intravenous and intraperitoneal routes of administration, along with a prolonged release profile of 43% by the 48-h incubation period. Antioxidant activity was evaluated using the DPPH assay. While cytotoxicity was assessed against 8 × 10 6 cells/mL Ehrlich ascites carcinoma (EAC) cells, similar cytotoxic activity was observed at equal doses of 10 mg/kg of CMC/SeNPs (15–75 nm) and Doxorubicin showing 94.2% (IC 50 = 0.84 mg/kg) and 96.4% (IC 50 = 0.78 mg/kg), respectively. Interestingly, SeNPs (40–65 nm) exhibited a strong “nanoeffect” achieving 93% cytotoxicity (IC 50 = 1.01 mg/kg) after 12 h of incubation, comparable to doxorubicin. These results underscore the potential of SeNPs as a promising candidate for biomedical applications, particularly in cancer therapy.

关键词： antioxidant ascorbic acid cytotoxicity lethal dose nanocomposite selenium nanoparticles sodium carboxymethylcellulose sodium selenite

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A diatrizoic acid derivative for N -acylation of amino acids

Results in Chemistry

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Results in Chemistry 2025年 16卷

作者： Kousaku Ohkawa Hemdeep Kaur Tracy Nguyen Beatrice Mae Malvar Rebecca Back Chloe Jin Parisa Khosropour Shuichi Suzuki Frank P.K. Hsu Ichiro Yuki Division of Synthetic Polymers Institute of High Polymer Research Faculty of Textile Science and Technology Shinshu University Tokida 3-15-1 Ueda 386-8567 Japan Division of Bibliometrics and Social Implementation Institute for Fiber Engineering Interdisciplinary Cluster for Cutting Edge Research Shinshu University Tokida 3-15-1 Ueda 386-8567 Japan Department of Neurological Surgery University of California Irvine 200S Manchester St. Suite 210 Orange CA92868 USA AquaTeX Medical Inc. Irvine CA92617 USA Department of Neurosurgery The Jikei University Hospital 3 Chome-25-8 Nishi-Shinbashi Minato City Tokyo 105-8461 Japan

3,5-Bis(acetamido)-2,4,6-triiodobenzoic acid, aka diatrizoic acid (DTZOH), is a major compound for the radiopaque material research. Iodine elements at the 2,4,6-positions are the origin of the radiopacity, but the bulkiness of iodine frequently inhibits the nucleophilic attack to the 1-carboxylic carbon, resulting in a low yield when DTZOH is used as an acylation agent. In this study, the authors hypothesized that the 1-carboxylic oxygen is utilized as a nucleophile because of its freedom from iodine-shielding. The base-catalyzed esterification using tert -butyl α -bromoacetate and DTZOH formed the diatrizoyloxyacetic acid tert -butyl ester (DTZAc-O t Bu) and subsequent removal of the t Bu group using trifluoroacetic acid yielded the diatrizoyloxyacetic acid (DTZAcOH) in quantitative yield. Acylation of the primary amino groups of the β -alanine ethyl ester or N α - tert -butyloxycarbonyl- l -lysine tert -butyl ester using isobutyl chloroformate were satisfactory in about 85 mol% yields. Conformer search calculations suggested that among the three classes of condensation reagents, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide monohydrochloride, 1,1′-cabonyldimidazole, and isobutyl chloroformate, the mixed anhydride generated by the condensation of DTZAcOH and isobutyl chloroformate has the highest freedom in the nucleophile approach direction and the lowest hindrance to the nucleophilic center. DTZAcOH is a feasible acylating agent of primary amino groups and inspires new designs of the functional X-ray shielding materials.

关键词： Diatrizoic acid derivatives N-acylation of amino acid derivatives Conformer search calculation

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A Dynamic Metal-Organic Radical Emission System

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Angewandte Chemie 2024年第12期137卷

作者： Xiang Li Prof. Yuan Wang Prof. Glib V. Baryshnikov Ihor Sahalianov Prof. Hans Ågren Yuri Tanuma Prof. Zhiyun Zhang Prof. Cheng Qian Dr. Muyu Cong Prof. Tao Yi Prof. Hongwei Wu State Key Laboratory for Modification of Chemical Fiber and Polymer Materials Key Lab of Science and Technology of Eco-Textile Ministry of Education College of Chemistry and Chemical Engineering Donghua University Shanghai 201620 China Beijing National Laboratory of Molecular Sciences and CAS Key Laboratory of Colloid Interface and Thermodynamics Institute of Chemistry Chinese Academy of Sciences North First Street 2 Zhongguancun Beijing 100190 China Laboratory of Organic Electronics Department of Science and Technology Linköping University SE-60174 Norrköping Sweden Wallenberg Initiative Materials Science for Sustainability Department of Science and Technology Linköping University SE-60174 Norrköping Sweden Department of Physics and Astronomy Uppsala University Uppsala SE-751 20 Sweden Jožef Stefan Institute Jamova 39 1000 Ljubljana Slovenia Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Center for Materiobiology and Dynamic Chemistry East China University of Science & Technology Shanghai 200237 P. R. China

Developing new organic radical emission systems and regulating their luminescence properties presents a significant challenge. Herein, we build dynamic and multi-emission band radical luminescence systems by co-assembling inorganic metal salts with carbonyl compounds in ionic liquids. After the assembling, dual-band, and excitation wavelength-dependent emission was observed upon ultraviolet light irradiation, one emission band originates from carbonyl radical after light irradiation, the other band from the ligand-metal charge transfer (LMCT) state, which benefits from the charge transfer from the radicals to the metal salts. The dual emission centers also introduce excitation wavelength-dependent properties for the molecules. In addition, three-band emission covering the visible and near-infrared regions can be shown when two or three kinds of metal ions are simultaneously doped into the radical system driven by the ligand-metal-metal charge transfer (LMMCT). Interestingly, visible light can quickly quench the radical emission of systems, thus realizing a dynamic luminescence. The LMMCT effect and strong supramolecular interactions significantly improve the photoluminescence quantum yield by up to 67.2 %. Moreover, such materials can be successfully used for detecting radioactive metal ions and information encryption. This study develops a platform for manufacturing various metal-organic radical emission systems with diverse properties.

关键词： metal-organic radical multi-band emission dynamic luminescence supramolecular interactions information encryption

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A monodisperse anionic silver nanoparticles colloid: Its selective adsorption and excellent plasmon-induced photodegradation of Methylene Blue

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Journal of colloid and interface science 2018年 523卷 98-109页

作者： Xiaohuan Ji Guangqian Kan Xiaoze Jiang Bin Sun Meifang Zhu Yushan Sun State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 PR China. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 PR China. Electronic address: xiaozejiang@***. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 PR China. Electronic address: sunbin@***. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 PR China. Electronic address: zmf@***. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 PR China State Key Lab of Biobased Fiber Manufacturing Technology China Textile Academy Beijing 100025 PR China.

To address the pollution problem of organic dyes, monodispersed anionic silver nanoparticles (AgNPs) with an average size of 6 nm were prepared in water media via chemical reduction method from oleic acid and n-butyl amine. The aqueous solution of the resultant AgNPs was utilized as a photocatalyst to investigate the adsorption and photodegradation behaviors of organic dyes under different light irradiation. The morphology and surface characteristics of the synthesized AgNPs were probed using TEM, XRD, FTIR and zeta potential analysis. The adsorption and degradation process of organic dyes on the AgNPs were characterized in details by UV-Vis spectrophotometer. The results showed that the AgNPs exhibited a characteristic charge- and size-selective adsorption of dyes owing to the profoundly negative charged surface, which enables the AgNPs to possess high selective degradation of Methylene Blue. More still, due to the surface plasmon resonance (SPR) effect of AgNPs, the obtained AgNPs presented a higher photocatalytic activity to Methylene Blue under UV light, visible light, and solar light compared with commercial photocatalysts. The 5 cyclic reactions revealed its high stability and reusability. In a nutshell, the proposed mechanism systematically combined the selective adsorption and the SPR effect to explain the detailed photocatalytic process of the obtained AgNPs.

关键词： Anionic Ag nanoparticles Methylene Blue Photocatalyst Photodegradation Selective adsorption Surface plasmon resonance effect

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Bistable polymer Actuators: Bioinspired Electrically Activated Soft Bistable Actuators (Adv. Funct. Mater. 35/2018)

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Advanced Functional Materials 2018年第35期28卷

作者： Huiqi Shao Shuzhen Wei Xin Jiang Douglas P. Holmes Tushar K. Ghosh Department of Textile Engineering Chemistry and Science Fiber & Polymer Science Program North Carolina State University Raleigh NC 27695 USA Department of Mechanical Engineering Boston University Boston MA 02215 USA

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Synthesis of monodisperse and porous ag nanoparticles/polystyrene microcomposite particles by seeded suspension polymerization

Synthesis of monodisperse and porous ag nanoparticles/polyst...

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fiber Society 2017 Spring Conference: Next Generation fibers for Smart Products

作者： Ji, Xiaohuan Exnowitz, Franziska Sun, Bin Pauer, Werner Zhu, Meifang Sun, Yushan Mortiz, Hans-Ulrich State Key Lab for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Shanghai China Institute for Technical and Macromolecular Chemistry University of Hamburg Hamburg Germany State Key Lab of Biobased Fiber Manufacturing Technology China Textile Academy Beijing China

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Parametric solution of a small-large black hole coexistence curve

arXiv

引用

arXiv 2017年

作者： Li, Shanshan Li, Dan-Dan Mi, Li-Qin Li, Zhong-Heng College of Science Zhejiang University of Technology Hangzhou310032 China Fiber and Polymer Science Program North Carolina State University RaleighNC27695 United States College of Chemical Engineering Zhejiang University of Technology Hangzhou310032 China

We consider the first-order phase transition of a charged anti-de Sitter black hole, and find that the equation of state with the conditions of the two coexisting phases, leads to the two coupled equations about the thermodynamic volumes of small black hole and large black hole. By solving the equations, it is found that each reduced volume is only a function of the parameter ω. All properties of the coexistence curve can be studied from the two volume functions. In particular, each thermodynamic quantity is described by a piecewise analytic function. The demarcation point is located at ωd = 12(2√3 − 3). The thermodynamic function but not its derivative, is continuous at the point. This property is completely different from that of the ven der Waals fluid. Moreover, the thermodynamic behaviors as ω → 0 are discussed. From which one can easily obtain some critical exponents and amplitudes for small-large black hole phase transitions. Copyright © 2017, The Authors. All rights reserved.

关键词： Thermodynamics

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