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Reversibly and Irreversibly Humidity‐Responsive Motion of Liquid Crystalline Network Gated by SO 2 Gas
Author(s) -
Lan Ruochen,
Sun Jian,
Shen Chen,
Huang Rui,
Zhang Lanying,
Yang Huai
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201900013
Subject(s) - humidity , materials science , relative humidity , fabrication , chemical engineering , nanotechnology , layer (electronics) , salt (chemistry) , organic chemistry , chemistry , meteorology , medicine , physics , alternative medicine , pathology , engineering
Manipulating functional liquid crystalline networks (LCNs) by multiple stimuli has been a hot topic in the research of smart actuators and fabrication of biomimetic robots. Here, a single‐layer LCN film showing dual responsiveness to humidity and SO 2 gas is prepared. Interestingly, the humidity sensitivity of the LCN film can be gated by exposing the film to SO 2 . At the same time, the SO 2 sensitivity is strongly affected by the ambient relative humidity (RH) and the response time is able to be tuned by changing the RH over a wide range. The mechanism of this dual response of the LCN film is ascribed to the neutralization of carboxylic acid and in situ acidification of the carboxylic salt. The reversibly and irreversibly humidity‐induced motion gated by SO 2 renders the LCN film valuable in the design and preparation of multifunctional devices.