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Structural and hydrophobic-hydrophilic properties of nanosilica/zirconia alone and with adsorbed PDMS

机译:纳米二氧化硅/氧化锆单独和吸附PDMS的结构和疏水亲水性

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摘要

Two nanosilica A-300/zirconia (SZ) composites at zirconia content C_(zro_2) = 5 and 20 wt.% were synthesized using a wet impregnation method with zirconium acetylacetonate as a precursor. The specific surface area of SZ is larger than that of A-300 because zirconia is composed of nanoparticles (crystallites of 4nm in average size at C_(zro_2) = 20 wt.%) smaller than those of the initial silica (d_(av)≈11 nm). A-300 and SZ modified by polydimethylsiloxane (PDMS at molecular weight 1700 and 7960) in amounts of 5,10,15, 20 and 40 wt.% remained in the powder state with aggregates of primary particles smaller than those of A-300. SZ is more hydrophilic than silica but PDMS/SZ is more hydrophobic (maximum hydrophobic at Cpdms 15-20 or 40 wt.%) than PDMS/A-300.
机译:使用湿式浸渍法,以乙酰丙酮锆为前驱体,合成了两种氧化锆含量C_(zro_2)= 5和20 wt。%的纳米二氧化硅A-300 /氧化锆(SZ)复合材料。 SZ的比表面积大于A-300的比表面积,因为氧化锆由比初始二氧化硅(d_(av)小)的纳米颗粒(C_(zro_2)= 20 wt%时平均粒径为4nm的晶体)组成≈11nm)。被聚二甲基硅氧烷(分子量为1700和7960的PDMS)改性的A-300和SZ的含量分别为5,10,15、20和40 wt。%(重量),一次颗粒的聚集体小于A-300。 SZ比二氧化硅更亲水,但PDMS / SZ比PDMS / A-300更具疏水性(Cpdms 15-20或40 wt。%时最大疏水性)。

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