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Bacteria‐Resistant Single Chain Cyclized/Knotted Polymer Coatings

Angewandte Chemie 2019年第31期131卷

作者： Qian Xu Sigen A Manon Venet Yongsheng Gao Dezhong Zhou Wei Wang Ming Zeng Chiara Rotella Xiaolin Li Xi Wang Jing Lyu Brian J. Rodriguez Wenxin Wang Charles Institute of Dermatology School of Medicine University College Dublin Ireland School of Chemical Engineering and Technology (SCET) Xi'an Jiaotong University Xi'an Shaanxi China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300350 China Conway Institute of Biomolecular and Biomedical Research University College Dublin Ireland MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University 310027 Hangzhou China

Further to conventional linear, branched, crosslinked, and dendritic polymers, single chain cyclized/knotted polymers (SCKPs) have emerged as a new class of polymer structure with unique properties. Herein, the development of bacteria‐resistant SCKPs is reported and the effect of this structure on the resistance of polymer materials to bacteria is investigated. Four SCKPs were synthesized by reversible addition fragmentation chain transfer (RAFT) homopolymerization of multivinyl monomers (MVMs) and then crosslinked by UV light to form SCKP films. Regardless of MVM type used, the resulting SCKP films showed much higher resistance to bacteria, and up to 75 % less bacterial attachment and biofilm formation, in comparison with the corresponding non‐SCKP films. This is due to the altered surface morphology and hydrophobicity of the SCKP films. These results highlight the critical role of the SCKP structure in enhancing the resistance of polymeric materials to bacteria.

关键词： Antimikrobielle Oberflächen Beschichtungen Cyclisierte/verknotete Einzelkettenpolymere Multivinyl-Monomere RAFT-Polymerisation

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Theoretical predication for transition energies of thermally activated delayed fluorescence molecules

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Chinese Chemical Letters 2016年第8期27卷 1445-1452页

作者： Xiaohui Tian Haitao Sun Qisheng Zhang Chihaya Adachi MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University State Key Laboratory of Precision Spectroscopy School of Physics and Materials Science East China Normal University Center for Organic Photonics and Electronics Research (OPERA) Kyushu University

Thermally activated delayed fluorescence（TADF） emitters are primarily comprised of intramolecular charge-transfer（ICT） molecules with small energy difference between the lowest singlet and triplet excited *** lend extremely favorable electroluminescent performance to organic light-emitting diodes（OLEDs）.This paper summarizes relevant issues and research efforts in the theoretical prediction of singlet- and triplet-transition energies of ICT molecules via time-dependent density functional theory（TDDFT）.The successful application of the descriptor-based optimal Hartree-Fock percentage method and the optimally tuned range-separated functional to many TADF systems represent an interesting approach to the exact prediction of the complex excited-state molecular dynamics within TDDFT.

关键词： Thermally activated delayed fluorescence Intramolecular charge-transfer Time-dependent density functional theory Transition Energy Descriptor

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Theranostic hyaluronic acid prodrug micelles with aggregation- induced emission characteristics for targeted drug delivery

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Science China Chemistry 2016年第12期59卷 1609-1615页

作者： Lin Wang Haoke Zhang Anjun Qin Qiao Jin Ben Zhong Tang Jian Ji Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China Department of Chemistry The Hong Kong University of Science ＆ Technology Kowloon Hong Kong China

Theranostic hyaluronic acid(HA) prodrug micelles with pH-responsive drug release and aggregation-induced emission(AIE)properties were prepared by chemical graft of biomimetic phosphorylcholine(PC), anticancer drug doxorubicin(DOX) and AIE fluorogen tetraphenylene(TPE) to the HA backbone. DOX was conjugated to the HA backbone by a hydrazone bond which can be hydrolyzed under acidic environment and result in pH-triggered smart release of DOX. The TPE units with typical AIE characteristics were applied for real time drug tracking in cancer cells. The HA-based prodrugs could self-assemble into micelles in aqueous solution as confirmed by the dynamic light scattering(DLS) and transmission electron microscopy(TEM). The intracellular distribution of HA prodrug micelles could be clearly observed by fluorescence microscopy based on the strong fluorescence of TPE. Moreover, after treated with the micelles, stronger fluorescence of TPE in CD44 overexpressed MDA-MB-231 cancer cells was observed, compared to the CD44 negative cell line, NIH3T3 cells, suggesting efficient cell uptake of HA prodrug micelles by receptor-mediated endocytosis. The cell viability results indicated that the prodrug micelles could inhibit the proliferation of the cancer cells effectively. Such pH-triggered theranostic drug delivery system with AIE features can provide a new platform for targeted and image-guided cancer therapy.

关键词： hyaluronic acid AIE prodrug drug delivery

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Axial Chiral Aggregation-Induced Emission Luminogens with Aggregation-Annihilated Circular Dichroism Effect

Axial Chiral Aggregation-Induced Emission Luminogens with Ag...

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中国化学会第八届全国分子手性学术研讨会

作者： Haoke Zhang Anjun Qin Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of Chemistry The Hong Kong University of Science & Technology Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

Chiral AIEgens play indispensable roles and have huge development potentials in the areas of bio-sensing and highly sophisticated optical devices,*** impressive way to generate chiral AIEgens is to introduce sugar or amino acid groups into AIE units like tetraphenylethene(TPE) and siloles. However,some shortcomings existed in these systems,such as poor thermal ***,these AIEgens are not suitable for optical and electrical device fabrication due to the presence of sugar or amino acid ***,other type of chiral AIEgens are in highly *** this work,we created a new kind of axial chiral AIEgens by attaching the TPE to binaphthanol(BINOL) moieties for the first time,which had a better thermal stability(T = 425 oC).They are AIE-active and possess high quantum yield(φ) in the aggregate ***,these AIEgens showed the abnormal aggregation-annihilated circular dichroism(AACD) effect(Chart 1).The decease of the twisted angle between the naphthalene rings in BINOL unit upon aggregation was rationalized as the cause for this phenomenon.

关键词： Aggregation-Induced Emission Aggregation-Annihilated Circular Dichroism

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Multi-functional bio-compatible luminescent apatite with fatty acid passivated nano silver covers and its theranostics potential

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Advances in Natural Sciences: Nanoscience and Nanotechnology 2017年第3期8卷

作者： Asha, S. Ananth, A. Nimrodh Kumari, G. Vanitha Prakash, B. Jose, Sujin P. Rajan, M. A. Jothi Bio-Nano Laboratory PG and Research Department of Physics Arul Anandar College Karumathur625514 India MOE Key Laboratory for Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310027 China School of Physics Madurai Kamaraj University Madurai625024 India

Europium doped hydroxyapatite (EDA) nanorods with linoleic acid passivated silver ions on their surfaces were synthesized using facile, one-step hydrothermal route. Annealing the samples at 250 °C resulted in formation of ultra-small silver (USS) nanoparticles on the surface by nucleation through diffusion process. EDA exhibited luminescence properties due to the presence of europium ions doped on the calcium sites of hydroxyapatite. These EDA nanorods exhibited a different luminescent behavior in the presence of silver ions and USS nanoparticles. This report also demonstrates excellent biocompatibility and cytotoxicity of EDA nanorods with silver ions towards fibroblast cell lines (F929) and breast cancer cells (MCF-7). Visible and near infra-red (NIR) emissions in EDA, induced by silver ions and USS nanoparticles makes it a potential system for deep tissue imaging applications. The arrangement of USS over the EDA was tunable and hence the selectivity and enhancement of the Eu3+ ions emission can also be tuned. The multifunctional properties of this system such as its active luminescence over a wide range, its cell proliferation towards normal cells and cytotoxicity towards cancer cells shows its potential for application in cancer theranostics. © 2017 Vietnam Academy of Science & Technology .

关键词： Luminescence

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Actuators: Combining 3D Printing with Electrospinning for Rapid Response and Enhanced Designability of Hydrogel Actuators (Adv. Funct. Mater. 19/2018)

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Advanced Functional Materials 2018年第19期28卷

作者： Tingting Chen Hadi Bakhshi Li Liu Jian Ji Seema Agarwal MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Zheda Road 38 310027 Hangzhou China Macromolecular Chemistry II and Bayreuth Center for Colloids and Interfaces Universität Bayreuth Universitätsstraße 30 95440 Bayreuth Germany

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Super‐Resolution Microscopy: On‐Chip Super‐Resolution Imaging with Fluorescent Polymer Films (Adv. Funct. Mater. 27/2019)

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Advanced Functional Materials 2019年第27期29卷

作者： Chenlei Pang Jingxi Li Mingwei Tang Jianpu Wang Ioanna Mela Florian Ströhl Lisa Hecker Weidong Shen Qiulan Liu Xiaowei Liu Yinan Wang Hao Zhang Meng Xu Xinghong Zhang Xu Liu Qing Yang Clemens F. Kaminski State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China Institute of Advanced Materials Nanjing Tech University Nanjing 211816 China Department of Chemical Engineering and Biotechnology University of Cambridge Cambridge CB3 0AS United Kingdom MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China State Key Lab. of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China

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Electron transport in solution-grown TIPS-pentacene single crystals:Effects of gate dielectrics and polar impurities

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Chinese Chemical Letters 2016年第12期27卷 1781-1787页

作者： Zhuo-Ting Huang Guo-Biao Xue Jia-Ke Wu Shuang Liu Huan-Bin Li Yu-Hui Yang Feng Yan Paddy K.L.Chan Hong-Zheng Chen Han-Ying Li MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Applied Physics and Materials Research Centre The Hong Kong Polytechnic University Hong Kong China Department of Mechanical Engineering The University of Hong Kong Hong Kong China

The n-channel behavior has been occasionally reported in the organic field-effect transistors （OFETs） that usually exhibit p-channel transport only. Reconfirmation and further examination of these unusual device performances should deepen the understanding on the electron transport in organic semiconductors. 6,13-bis（triisopropyl-silylethynyl） pentacene （TIPS-pentacene）, a widely examined p-channel material as Au is used for source-drain electrodes, has recently been reported to exhibit electron transport when grown from non-polar solvent on divinyltetramethyldisiloxanebis （benzocy- clobutene）（BCB） dielectric, spurring the study on this unusual electron transport. This paper describes FET characteristics of solution-grown TlPS-pentacene single crystals on five polymer gate dielectrics including polystyrene （PS）, poly（methyl methacrylate）（PMMA）, poly（4-vinyl phenol）（PVP）, poly（vinyl alcohol）（PVA） and poly（vinylidene fluoride-trifluoroethylene-chlorofluoroethylene）（P（VDF-TrFE-CFE））. In addition to the p-channel behavior, electron transport occurs in the crystals on PMMA, PS, thick PVA （40 nm） and a bilayer dielectric of PMMA on P（VDF-TrFE-CFE）, while does not on PVP and thin PVA （2 nm）. The two distinct FET characteristics are consistent with the previous reported trap effect of hydroxyl groups （in PVP and PVA） and reduced injection barrier by Na~ ions （as impurity in PVA）. The highest electron mobility of 0.48 cm2 V-1 s-1 has been achieved in the crystals on PMMA. Furthermore, the electron transport is greatly attenuated after the crystals are exposed to the vapor of a variety of polar solvents and the attenuated electron transport partially recovers if the crystals are heated, indicating the adverse effect of polar impurities on electron transport. By reconfirming the n-channel behavior in the OFETs based on TIPS-pentacene, this work has implications for the design of n-channel and ambipolar OFETs.

关键词： TIPS-pentacene single crystal Electron transport Polymer dielectric Polar solvent Organic field-effect transistor

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Systematic characterization of transport and thermoelectric properties of a macroscopic graphene fiber

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Nano Research 2016年第11期9卷 3536-3546页

作者： Weigang Ma Yingjun Liu Shen Yan Tingting Miao Shaoyi Shi Mincheng Yang Xing Zhang Chao Gao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Hangzhou 310027 China Department of Thermal Engineering Tsinghua University Beijing 100084 China Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation Engineering China University ot Petroleum Beijing Beijing 102249 China

Graphene, a two-dimensional material with extraordinary electrical, thermal, and elastic performance, is a potential candidate for future technologies. However, the superior properties of graphene have not yet been realized for graphenederived macroscopic structures such as graphene fibers. In this study, we systematically investigated the temperature （T ）-dependent transport and thermoelectric properties of graphene fiber, including the thermal conductivity （A）, electrical conductivity （o）, and Seebeck coefficient （S）. A increases from 45.8 to 149.7 W·m^-1·K^-1 and then decreases as T increases from 80 to 290 K, indicating the boundary-scattering and three-phonon Umklapp scattering processes. σ increases with T from 7.1 × 10^4 to 1.18 × 10^5 S·m^-1, which can be best explained by the hopping mechanism. S ranges from -3.9 to 0.8 μV·K^-1 and undergoes a sign transition at approximately 100 K.

关键词： macroscopic graphene fiber thermoelectric properties thermal conductivity electrical conductivity Seebeck coefficient

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Effects of Nanosilica on Crystallization and Thermal Ageing Behaviors of Polyethylene Terephthalate

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Chinese Journal of Polymer Science 2015年第5期33卷 697-708页

作者： Ying-jie Xu 宋义虎 Qiang Zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The effects of nanosilica（SiO2） on crystallization and thermal aging behaviors of polyethylene terephthalate（PET） have been studied using differential scanning calorimetry（DSC） and polarized optical microscopy（POM）, viscometry, tensile testing and scanning electron microscopy（SEM）. For non-isothermal and isothermal crystallizations, the crystallization rate of PET increases considerably with increasing content of SiO2 providing a large number of nucleation sites, but the relative crystallinity of the nanocomposites has little differences with that of neat PET. According to POM observation, the nucleation of PET becomes faster and the nucleation density increases significantly with increasing SiO2 content. For PET and its nanocomposites thermally aged at 190 ℃, the results of intrinsic viscosity, carboxyl content and tensile test show that the degradation rate of PET is reduced with the addition of a small content of SiO2, but the degradation rate increases with further addition of SiO2, owing to the dual effect of SiO2 on PET degradation.

关键词： Polyethylene terephthalate Nanosilica Crystallization Thermal ageing

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