标题：Electrical Writing onto a Dynamically Responsive Polysaccharide Medium: Patterning Structure and Function into a Reconfigurable Medium
作者： Wu, S (Wu, Si); Yan, K (Yan, Kun); Zhao, YA (Zhao, Yanan); Tsai, CC (Tsai, Cheng-Chieh); Shen, J (Shen, Jana); Bentley, WE (Bentley, William E.); Chen, Y (Chen, Yun); Deng, HB (Deng, Hongbing); Du, YM (Du, Yumin); Payne, GF (Payne, Gregory F.); Shi, XW (Shi, Xiaowen)
ADVANCED FUNCTIONAL MATERIALS 卷： 28 期：40 页码：1803139 DOI：10.1002/adfm.201803139 出版年：OCT 4 2018
摘要：Historically, paper is the medium to write information. Here, the concept of writing is expanded from the addition of mass (i.e., ink) onto a static polysaccharide medium (i.e., paper), to the addition of electrical energy to a dynamically reconfigurable polysaccharide medium. Specifically, a dual-responsive interpenetrating polysaccharide network is used as a dynamic medium. Electrical writing is achieved using an electrode pen to locally perform the cathodic electrolysis reactions that generate high-pH regions that neutralize the interpenetrating chitosan chains and induce their self-assembly into crystalline regions. Surprisingly, the gradients in structure induced by cathodic writing are stable even after the pH gradient has dissipated. Molecular modeling indicates that this stability results from structure-induced changes in chitosan's pK(a). Various experimental approaches demonstrate that the changes in structure generated by cathodic writing alter the medium's mechanical, chemical, and biological properties. Importantly, the structure and information imparted into the film is reversible allowing the medium to be erased and new information to be written. Broadly, this work demonstrates the use of top-down electrical inputs to induce bottom-up structural changes in a biopolymer-based medium and these structural changes fundamentally alter how this medium interacts chemically and biologically with its environment.
作者关键词： electrical writing; hydrogel; polysaccharide; self-assembly
通讯作者地址：Shi, XW (reprint author), Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Hubei, Peoples R China.
Payne, GF (reprint author), Univ Maryland, Inst Biosci & Biotechnol Res, Fischell Dept Bioengn, College Pk, MD 20742 USA.
[Wu, Si; Deng, Hongbing; Du, Yumin; Shi, Xiaowen] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Hubei, Peoples R China.
[Yan, Kun] Wuhan Text Univ, Sch Mat Sci & Engn, Wuhan 430200, Hubei, Peoples R China.
[Zhao, Yanan; Chen, Yun] Wuhan Univ, Dept Biomed Engn, Sch Basic Med Sci, Wuhan 430071, Hubei, Peoples R China.
[Tsai, Cheng-Chieh; Shen, Jana] Univ Maryland, Sch Pharm, Dept Pharmaceut Sci, Baltimore, MD 21201 USA.
[Bentley, William E.; Payne, Gregory F.] Univ Maryland, Inst Biosci & Biotechnol Res, Fischell Dept Bioengn, College Pk, MD 20742 USA.
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