“Intelligent” organosilica sol–gels that show fast dynamic response to temperature, pH, and electric fields are presented. A bis-(propyl)ethylenediamine bridge is responsible for a change of water affinity under environmental stimuli, resulting in water expulsion or uptake by the polymeric network. The Figure shows the tips of a tweezer-like sol–gel device that opens and closes upon pH fluctuation.
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Rao et al. (2002) studied this question.
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