Figure 2.

TEM images of hollow TiO2 particles. Hollow TiO2 particles obtained by dissolution of PSt by THF (A, sample D) and those by dissolution and preheating of PSt/TiO2 (B, sample HD).

Wang et al. Nanoscale Research Letters 2012 7:646   doi:10.1186/1556-276X-7-646
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