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02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
대한화학회 제121회 학술발표회 및 총회
A Crown-Ether-Based Moldable Supramolecular Gel with Unusual Mechanical Properties and Controllable Electrical Conductivity Prepared by Cation-Mediated Cross-Linking
2018년 2월 4일 17시 09분 17초
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4월 19일 (목요일) 11:00~12:30
, Junho Ahn
, Jong Hwa Jung
Department of Chemistry, Gyeongsang National University, Korea
Typical supramolecular gels do not exhibit electrical conductivity because of the wide band gaps present in the low-conjugation gelator molecules and the long distances between them, which arise because of the large amount of solvent within gel networks. Consequently, the practical application of supramolecular gels has been largely limited. Herein, we describe a strategy for significantly enhancing the mechanical, electrical, and vibrational isolation properties of supramolecular gels derived from low-molecular-weight building blocks, which involves the incorporation of Cs
ions as an additional conductive filler. High-elasticity supramolecular gels were produced from the hydrazone reaction between calix-arene- and 18-crown-6-ether-based building blocks, which could be formed simply by dissolving the building blocks in DMSO. These gels were mechanically strong and could be molded into free-standing objects. By controlling the concentration of the conductive filler in the supramolecular gels, we were able to tune their mechanical and electrical properties. The supramolecular gels exhibited 34-fold and 62-fold enhanced storage and loss moduli, respectively, upon addition of Cs
. Furthermore, the electrical conductivities of the supramolecular gels proportionally increased with the amount of Cs
in the gel network. These dramatic enhancements were due to the effective sandwich complex formation between the 18-crown-6 moieties of the building blocks and Cs
ions. We also evaluated the vibrational isolation abilities of the supramolecular gels. A glass bead in direct contact with the vibrating platform started to vibrate and roll when the mechanical vibrator was activated. In contrast, a bead separated from the platform by a sample of supramolecular gel kept its position without any movement. We believe that our strategy of embedding conductive fillers into self-assembled materials presents new possibilities for developing soft materials with unique functions.
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