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2.2. Surface modification of nanosilica with MPTMS
10 g of nanosilica were kept in a vacuum chamber for 24 h at
100 C, and then dispersed in 150 mL anhydrous toluene under
mechanical stirring and ultrasonic dispersing for 30 min. The mixture
was stirred at 300 rpm for a further 1 h, and then dropped into
another prepared mixture consisting of 10 mL water, 10 mL anhydrous
ethanol, 2 mL formic acid (as pH adjuster) and different levels
(25, 50, 75, 100 and 125 mL) of MPTMS under vigorously
stirring. After continuously stirring for 4 h at 50 C, the obtained
suspension was separated by centrifugation. After drying at 90 C
under vacuum, the mixture was extracted using Soxhlet extractor
for 12 h using toluene. Finally, the modified nanosilica was dried
at 90 C under vacuum condition for 12 h.
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