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Contractile radial strain of PNIPAAm particles measured in no matrix (magenta) or polyacrylamide matrix (green). Contraction of PNIPAAm particles in no matrix gives the thermal contraction εT. Each line represents the contraction of a different PNIPAAm particle. The reference temperature used to calculate contractile radial strain is 26°C. The labels on the horizontal axis represent the temperatures tested in the experiments.
