文献类型：期刊文献

英文题名：Supramolecular Assembly and Reversible Transition and of Chitosan Fluorescent Micelles by Noncovalent Modulation

作者：Liu, An[1] Song, Hong[1] Jia, Puyou[2] Lin, Ying[1,2] Song, Qingping[1] Gao, Jiangang[1]

第一作者：Liu, An

通信作者：Jia, P.[2]

机构：[1] Anhui Laboratory of Clean Catalytic Engineering, School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, China; [2] Jiangsu Key Laboratory for Biomass Energy and Material, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry [CAF], Nanjing, 210042, China

年份：2021

卷号：2021

外文期刊名：Advances in Polymer Technology

收录：EI(收录号：20214811239685)

语种：英文

外文关键词：Alkalinity - Bioactivity - Biocompatibility - Carboxylation - Chitosan - Ethylene - Hydrogen bonds - Micelles - Optoelectronic devices - Supramolecular chemistry

摘要：Chitosan-based intelligent artificial systems have been of increasing interest for their biocompatibility, multifunctionality, biological activity, and low cost. Herein, we report the fabrication of supramolecular nanoparticles based on water-soluble chitosan (WCS) and 1,1′,1″,1″′-(ethene-1,1,2,2-tetrayl)tetrakis(benzene-4,1-diyl) tetrakis(azanediyl)tetraacetic acid (TPE-(N-COOH)4), which is capable of reversible transition between polyion complexes (PICs) and hydrogen bonding complexes (HBCs) with tunable aggregation-induced emission driven by pH value. The PIC micelles could be formed via electrostatic interaction between ammonium cations and carboxylate anions under mild alkaline conditions. The formation of the micelles dramatically blocks the nonradiative pathway and enhances the fluorescence of TPE moieties, and the maximum fluorescence intensity was achieved near the isoelectric point due to the restriction of intramolecular motion. In addition, the fluorescence intensity and size of the PIC micelles exhibited a temperature response in the range from 20 to 80°C. Upon adjusting the solution pH to 2, the PIC micelles were reconstructed into hydrogen-bonding complexes while the hydrogen bonding interaction between the protonated carboxyl groups of TPE-(N-COOH)4 and chitosan. Moreover, the size of the micelles underwent a remarkable decrease, whereas the fluorescence emission was further enhanced by 6.25-fold. The pH actuated micellar transition from PIC to HBC with tunable fluorescence performance is fully reversible. This study provides novel multifunctional materials that are of great importance for their potential application in the fields of optoelectronic devices and chemical and biomedical sensors. ? 2021 An Liu et al.