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首页> 外文期刊>Colloid journal >The effect of preparation procedure and composition of water-ethanol suspensions of amorphous silica on their aggregative stability and kinetics of coagulation
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The effect of preparation procedure and composition of water-ethanol suspensions of amorphous silica on their aggregative stability and kinetics of coagulation

机译：无定形二氧化硅水-乙醇悬浮液的制备工艺和组成对其凝聚稳定性和混凝动力学的影响

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The method of flow ultramicroscopy is employed to study the effect of the composition and preparation procedure of dilute water-ethanol suspensions of two samples of amorphous silica (fractionated fused quartz and monodisperse amorphous silica) on the kinetics of their coagulation. It is revealed that all suspensions prepared by the addition of silica powders to water-ethanol mixtures with ethanol contents of 96 and 40 vol % are stable with respect to aggregation, as the suspensions prepared by the addition of aliquots of concentrated dispersions of the aforementioned silica samples in 96% ethanol aged for different time periods to water-ethanol mixtures containing 96 vol % ethanol. At a 40-vol % content of ethanol in the mixture, the coagulation whose character (including "superfast" coagulation) substantially depends on the time of aging of initial concentrated silica dispersions occurs. Furthermore, kinetic studies are performed for the coagulation of dilute silica suspensions prepared by the addition of silica powders to water-ethanol solutions containing 40 vol % of ethanol and traces (< 1 ppm) of poly(ethoxysilane), poly(acrylic acid), and a supernatant prepared by the centrifugation of concentrated silica dispersion in 96% ethanol aged for more than 3 months. It is found that the addition of aliquots of the aforementioned ethanol solutions to silica suspensions in 40% ethanol, which are initially stable with respect to aggregation, causes their superfast coagulation.
机译：采用流动显微技术研究了两种无定形二氧化硅样品（分级熔融石英和单分散无定形二氧化硅样品）的稀水-乙醇悬浮液的组成和制备工艺对其凝固动力学的影响。揭示了通过将二氧化硅粉末添加到乙醇含量为96和40体积％的水-乙醇混合物中制备的所有悬浮液对于聚集是稳定的，因为通过添加上述二氧化硅的浓缩分散体的等分试样制备的悬浮液。样品在96％的乙醇中老化了不同的时间，以至含有96％的乙醇的水-乙醇混合物。当混合物中乙醇的含量为40％（体积）时，就会发生凝结现象（包括“超快速”凝结）主要取决于初始浓缩二氧化硅分散体的老化时间。此外，还进行了动力学研究，研究了稀二氧化硅悬浮液的凝结过程，该悬浮液是通过将二氧化硅粉末添加到含有40％（体积）乙醇和痕量（<1 ppm）聚（乙氧基硅烷），聚（丙烯酸），通过将浓缩的二氧化硅分散液在96％的乙醇中离心3个月以上而制备的上清液。已经发现，将上述乙醇溶液的等分试样添加到40％乙醇中的二氧化硅悬浮液中，该悬浮液最初对于聚集是稳定的，从而引起其超快凝结。

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