Extra‐Large Mechanical Anisotropy of a Hydrogel with Maximized Electrostatic Repulsion between Cofacially Aligned 2D Electrolytes |
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Authors: | Koki Sano Yuka Onuma Arazoe Dr. Yasuhiro Ishida Dr. Yasuo Ebina Prof. Dr. Minoru Osada Prof. Dr. Takayoshi Sasaki Dr. Takaaki Hikima Prof. Dr. Takuzo Aida |
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Affiliation: | 1. Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Tokyo, Japan;2. RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan;3. National Institute for Materials Science, International Center for Materials Nanoarchitectonics, Tsukuba, Ibaraki, Japan;4. RIKEN SPring-8 Center, Sayo, Hyogo, Japan |
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Abstract: | In our previous work, we have shown that “electrostatic forces”, when generated anisotropically in aqueous media by 2D electrolytes upon cofacial orientation, enable the formation of a hydrogel with an anisotropic parameter, as defined by the ratio of elastic moduli E⊥/E∥, of 3.0. Herein, we successfully developed the design strategy for a hydrogel with an anisotropic parameter of no less than 85. This value is not only 28 times greater than that of our previous anisotropic hydrogel but also 6 times larger than the current champion record in synthetic hydrogels (E⊥/E∥~15). Firstly, we simply lowered ionic contaminants in the hydrogel and were able to enhance the anisotropic parameter from 3.0 to 18. Then, we chose a supporting polymer network allowing the hydrogel to carry a higher interior permittivity. Consequently, the anisotropic parameter was further enhanced from 18 to 85. Owing to the enhanced mechanical anisotropy, our new hydrogel displayed a superb ability of seismic isolation. |
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Keywords: | anisotropy composite materials electrostatic repulsion hydrogels materials science |
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