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Extra‐Large Mechanical Anisotropy of a Hydrogel with Maximized Electrostatic Repulsion between Cofacially Aligned 2D Electrolytes
Author(s) -
Sano Koki,
Arazoe Yuka Onuma,
Ishida Yasuhiro,
Ebina Yasuo,
Osada Minoru,
Sasaki Takayoshi,
Hikima Takaaki,
Aida Takuzo
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201807240
Subject(s) - anisotropy , self healing hydrogels , electrolyte , materials science , ionic bonding , electrostatics , polymer , nanotechnology , chemical physics , chemical engineering , chemistry , composite material , ion , polymer chemistry , optics , physics , organic chemistry , electrode , engineering
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.