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- W2068199846 abstract "Ordered mesoporous silica SBA-15 materials were synthesized using Pluronic P123 (non-ionic triblock copolymer, EO20PO70O20) as a template, under acidic conditions and different heating temperatures and time of the reaction solution. These materials were characterized by nitrogen adsorption–desorption measurements, Fourier-transformed infrared spectroscopy (FT-IR), and determination of points of zero charge and izoelectric points as well as particle diameters. Synthesis at lower temperature (80 °C) and longer time of reaction (48 h) gives samples with higher specific surface area (SBET = 710 m2 g−1), mesoporose surface (Smeso = 481 m2 g−1) and narrower pore size distribution. Material synthesized at higher temperature (100 °C) and shorter time of reaction (24 h) has lower specific surface and mesoporosity (SBET = 641 m2 g−1 and Smeso = 367 m2 g−1). At both samples, the presence of micropores was confirmed. The point of zero charge, pHPZC = 5.2 ± 0.2, and the isoelectric point, pHIEP = 2.3 ± 0.1, were not affected by synthesis conditions. Washing of silica samples in a dilute solution of nitric acid shifts the isoelectric point to a higher value (pHIEP = 3.0 ± 0.2) while the point of zero charge remains constant." @default.
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- W2068199846 date "2010-12-01" @default.
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- W2068199846 title "Synthesis and surface characterization of ordered mesoporous silica SBA-15" @default.
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- W2068199846 doi "https://doi.org/10.1016/j.matchemphys.2010.08.066" @default.
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