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(a) Variation in the relative transparency of the PNIPAAm membranes at the swollen and shrunken states depending on the initial crosslinker concentration of the pre-gel solutions. (Inset) Schematic of light transmitted through the moderately and highly crosslinked polymer membranes at the swollen (26 °C) and shrunken (36 °C) states. (b) Variations in the relative transparency of the PNIPAAm membranes in the swollen state vs. membrane thickness.
