The mixed solution was stirred for 4 h. The molar
ratios of PVP/TTIP/TEOS were also varied from (1.0:5.0:0.0) to
(1.0:4.0:1.0), (1.0:3.0:2.0), and (1.0:2.5:2.5), and their corresponding
samples denoted as samples A, B, C, and D, respectively
The mixed solution was stirred for 4 h. The molarratios of PVP/TTIP/TEOS were also varied from (1.0:5.0:0.0) to(1.0:4.0:1.0), (1.0:3.0:2.0), and (1.0:2.5:2.5), and their correspondingsamples denoted as samples A, B, C, and D, respectively
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