Abstract
PAM/TiO2 composite microspheres with hierarchical surface structures were synthesized by the reaction between tetrabutyl titanate (TBOT) located within porous polyacrylamide (PAM) microgels and water in a moist atmosphere. The morphology and composition of the composite microspheres were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FI-IR), X-ray diffraction (XRD), N2 absorption analysis, and mercury porosimetry, respectively. The results indicated that the composite microspheres, with different hierarchical surface morphologies, could be obtained by controlling the cross-linking degree of the porous PAM microgels, the relative humidity of the gas phase, the amount of residual impregnation liquid, and the TBOT concentration in the porous PAM microgels. Although the surface morphologies of the composite microspheres are varied, the morphologies are typically divided into three categories: (1) wrinkled surfaces covered with la...
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