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. 2015 Jan 6;5:7646. doi: 10.1038/srep07646

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(a) Transmittance spectra measured at 25°C and 40°C for the PNIPAm hydrogel and PNIPAm/GO hydrogel. (b) Temperature-dependent transmittance for the PNIPAm hydrogel and PNIPAm/GO hydrogel during heating and cooling cycles. The error bars are the standard deviations for 7 independent measurements. (c) Reversible and repeatable transparent-opaque transition of the PNIPAm/GO hydrogel.