A [polymer network/liquid crystals (LCs)/chiral dopant] composite with a smectic A (SA) ↔ chiral nematic (N*) phase transition is prepared. A very drastic change from the light-scattering SA phase to the transparent N* one is achieved upon heating the composite. The transparent state of the N* phase is 'frozen' in the SA phase upon cooling. When an ac electric field is applied to the composite, the transparent SA phase is changed into the light-scattering SA one again.
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