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Effect of silica nanoparticles on clay swelling and aqueous stability of nanoparticle dispersions

机译:二氧化硅纳米粒子对粘土膨胀和纳米粒子分散体水稳定性的影响

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摘要

The results of the effects of electrolyte type and concentration, nanoparticle concentration, pH, and temperature on the mobility and aqueous stability of polyethylene glycol (PEG)-coated silica nanoparticles are presented. Nanoparticle mobility was evaluated based on the ability to inhibit montmorillonite swelling in aqueous solutions through visual swelling tests, and the results were quantified in terms of the swelling index. The presence of PEG-coated silica nanoparticles was found to have a positive influence on the inhibition of clay swelling only in the presence of electrolytes. Quantification of nanoparticle stability in the presence of montmorillonite particles was achieved using ultraviolet–visible (UV–vis) spectrophotometry. At the highest concentration of montmorillonite dispersion studied, interaction between the dispersed montmorillonite particles and PEG-coated silica nanoparticles resulted in nanoparticle aggregation as indicated by increased turbidity and absorbance readings. Both nanoparticle concentration and montmorillonite dispersion concentration, in addition to the presence and concentration of NaCl, were found to strongly influence the stability of the mixture.
机译:给出了电解质类型和浓度,纳米颗粒浓度,pH和温度对聚乙二醇(PEG)涂层二氧化硅纳米颗粒的迁移率和水稳定性的影响的结果。通过目视溶胀试验,基于抑制蒙脱石在水溶液中溶胀的能力来评价纳米粒子的迁移率,并根据溶胀指数对结果进行定量。发现仅在电解质存在下,PEG-涂覆的二氧化硅纳米颗粒的存在对粘土膨胀的抑制具有积极影响。蒙脱石颗粒存在下纳米颗粒稳定性的量化是使用紫外可见(UV-vis)分光光度法完成的。在研究的最高蒙脱土分散体浓度下,分散的蒙脱土颗粒与PEG包覆的二氧化硅纳米颗粒之间的相互作用导致纳米颗粒聚集,如浊度和吸光度读数增加所表明的。发现除了NaCl的存在和浓度之外,纳米颗粒浓度和蒙脱石分散体浓度都强烈影响混合物的稳定性。

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