Real-time visual humidity response films of interpenetrating polymer network based on cholesteric liquid crystal and poly (acrylic acid)

Beyond Color Boundaries: Pioneering Developments in Cholesteric Liquid Crystal Photonic Actuators

“…These optical sensors have become popular due to their high sensitivity, low power consumption, and ease of manufacturing. Wenzhu Cao et al devised a straightforward, efficient, and battery-free visual humidity sensor by blending CLCs with acrylic acid and subsequently curing them to create an interpenetrating polymer network (IPN) film, capable of changing color with relative humidity [ 187 ]. Polyacrylic acid (PAA) is renowned for its humidity sensitivity, often integrated into liquid crystal film networks, thereby imparting the resulting interpenetrating polymer network (IPN) with the remarkable capability to undergo optical transformation in response to humidity changes.…”