Advanced Materials

Cover image for Vol. 27 Issue 33

March 15, 2002

"Intelligent" organosilica sol-gels.....

"Intelligent" organosilica sol-gels that show fast dynamic response to temperature, pH value and electric fields are featured. 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. A tweezer-like sol--gel device that opens and closes upon pH fluctuations is demonstrated (B.C. Dave et al., March 18; Adv. Mater. 2002, 14, 443-447).

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