Study the influence of residual water during the preparation processes on the shear thickening behavior of silica/PEG200 suspensions

IF 2.2 4区 工程技术 Q2 MECHANICS
Xing Ouyang, Lei Gong, Xiang Huang, Dazhu Chen
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引用次数: 0

Abstract

Silica/PEG200 shear thickening fluids (STFs) are widely used smart fluids. There is often residual water during the STF preparation process because of the strong water adsorbability due to the abundant hydroxyl group on the silica surface. Residual water usually influences the shear-thickening behavior of STFs. How much influence the residual water has during the preparation processes on the properties of STFs is still a problem. In this paper, six preparation processes were designed, and the influence of residual water content on the shear thickening behavior due to different preparation processes is analyzed. Firstly, three drying processes were used to prepare STFs, i.e., three kinds of silica powder, which were obtained from spray, freeze, or oven drying of the silica dispersion, were dispersed in PEG200 to obtain STFs. Secondly, three wet processes were used to prepare STFs, i.e., three kinds of silica slurry, which were obtained by centrifuging and washing through water, ethanol, or tetrahydrofuran of the silica dispersion, were directly dispersed into PEG200 and dried to obtain STFs. All the silica dispersion used in these six preparation processes was prepared using the Stöber method. The properties, microstructure, and residual water content of the STFs prepared by the six preparation processes were explored. The results showed that the preparation processes have a big influence on the properties of related STFs. The silica’s residual water content derived from different preparation processes is the critical factor that affects STFs’ shear thickening performance. The drying process using silica powder from spray drying of the silica dispersion resulted in the lowest water content and led to the best shear-thickening performance of the corresponding STFs. Meanwhile, the wet process using a slurry obtained by centrifuging and washing through tetrahydrofuran of the silica dispersion could also prepare STFs with good shear thickening behavior.

Graphical abstract

Abstract Image

Abstract Image

研究制备过程中的残留水对二氧化硅/PEG200 悬浮液剪切增稠行为的影响
二氧化硅/PEG200 剪切增稠液(STF)是一种广泛使用的智能液体。在 STF 制备过程中,由于二氧化硅表面含有丰富的羟基,具有很强的吸水性,因此通常会有残留水。残留水通常会影响 STF 的剪切增稠行为。在制备过程中,残留水对 STF 特性的影响有多大仍是一个问题。本文设计了六种制备工艺,分析了不同制备工艺导致的残余水含量对剪切增稠行为的影响。首先,采用了三种干燥工艺制备 STF,即将喷雾干燥、冷冻干燥或烘箱干燥得到的三种二氧化硅分散体粉末分散在 PEG200 中,得到 STF。其次,采用三种湿法工艺制备 STF,即把三种二氧化硅浆料直接分散到 PEG200 中,然后干燥得到 STF,这三种二氧化硅浆料分别是通过离心分离和水洗、乙醇洗或四氢呋喃洗得到的。这六种制备方法中使用的二氧化硅分散体均采用斯托伯法制备。研究了六种制备工艺制备的 STF 的性能、微观结构和残余水含量。结果表明,制备工艺对相关 STF 的性能有很大影响。不同制备工艺产生的二氧化硅残余水含量是影响 STFs 剪切增稠性能的关键因素。使用喷雾干燥二氧化硅分散体所得二氧化硅粉末的干燥工艺可获得最低的含水量,从而使相应的 STF 具有最佳的剪切增稠性能。同时,使用通过离心和四氢呋喃洗涤二氧化硅分散体得到的浆料的湿法工艺也能制备出具有良好剪切增稠性能的 STF。
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来源期刊
Korea-Australia Rheology Journal
Korea-Australia Rheology Journal 工程技术-高分子科学
CiteScore
2.80
自引率
0.00%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.
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