Investigation of factors affecting the thermal stability of silica-based shear thickening fluids

IF 2.2 4区 工程技术 Q2 MECHANICS
Wenjian Wang, Shuai He, Ziwen Dong, Wei Huang, Xuke Li, Xun Chen, Peng Chen
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引用次数: 0

Abstract

Recent experimental observation in thermal-induced gelation of silica-based shear thickening fluids (STFs) has necessitated the efforts to address the thermal instability of the STFs. The shear thickening behavior of hydrophilic fumed silica/PEG disappeared after thermal treatment. Hydrophobic surface is demonstrated to enhance thermal stability of the fumed silica/PEG system under the same thermal treatment. Dynamic temperature sweep experiments reveal a temperature-induced sol–gel transition of the hydrophilic silica/PEG. Meanwhile, hydrophobic silica/PEG does not undergo such gelation and still displays viscosity thickening after thermal treatment. This gelation process is found to be concentration-dependent and irreversible, with enhanced gelation at higher specific surface areas of hydrophilic silica particles. The small-angle X-ray scattering (SAXS) studies suggest that this sol–gel transition is likely attributed to the reduction of solvation layer which could be highly influenced by particle surface hydrophilicity. Comprehensive experiments, including Soxhlet extraction and rheology, confirm that the resulting stable three-dimensional structure is not formed by chemical crosslinks but behaves as a physical network. It is demonstrated how tailoring particle–medium interactions through controlling particle surface characteristics can be used to improve thermal stability of silica-based STFs.

Graphical abstract

Abstract Image

硅基剪切增稠流体热稳定性影响因素研究
最近对硅基剪切增稠流体(STFs)热诱导凝胶化的实验观察表明,有必要努力解决 STFs 的热不稳定性问题。热处理后,亲水性气相二氧化硅/PEG 的剪切增稠行为消失了。在相同的热处理条件下,疏水表面增强了气相二氧化硅/PEG 系统的热稳定性。动态温度扫描实验揭示了亲水性二氧化硅/PEG 在温度诱导下的溶胶-凝胶转变。与此同时,疏水性二氧化硅/PEG 不会发生这种凝胶化,在热处理后仍会出现粘度增稠现象。研究发现,这种凝胶化过程与浓度有关且不可逆,亲水性二氧化硅颗粒的比表面积越大,凝胶化程度越高。小角 X 射线散射(SAXS)研究表明,这种溶胶-凝胶转变可能归因于溶胶层的减少,而溶胶层的减少在很大程度上受到颗粒表面亲水性的影响。索氏提取和流变学等综合实验证实,由此产生的稳定三维结构并非由化学交联形成,而是表现为一种物理网络。这说明了如何通过控制颗粒表面特性来调整颗粒与介质之间的相互作用,从而提高硅基 STF 的热稳定性。
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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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