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pH-responsive charge conversion of Cu-LDH@PAMA/DMMA when the buffer pH changing from 7.4 to 6.8. (A) DLS size and ζ-potential after incubation in the buffer for 2 h. (B) Dynamic ζ-potential changes in two buffers; transmission electron microscopy (TEM) images of Cu-LDH@PAMA/DMMA incubated in the buffers with pH 7.4 (C) and 6.8 (D) for 2 h.
