UV-visible assessment of hydrocluster formation and rheological behaviour in bimodal and mono-disperse shear thickening fluids

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• 作者：Masoud Fahool ; Ali Reza Sabet
• 关键词：Shear thickening fluid ; UV ; visible ; Hydrocluster ; Bimodal ; Mono ; disperse
• 刊名：Rheologica Acta
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：54
• 期：1
• 页码：77-83
• 全文大小：836 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Polymer Sciences
  Mechanical Engineering
  Soft Matter and Complex Fluids
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1528

文摘

When an applied shear to a fluid results in a steep rise in its viscosity, it is referred to as shear thickening fluid (STF). This study followed two aims: first, to investigate the hydrocluster formation in STF using a novel technique via UV-visible spectroscopy in bimodal and mono-dispersed systems and second, to study the rheological response of bimodal as against mono-dispersed nano-sized silica particles in an STF system. Two nano-sized silica particles (50-nm fumed silica and 12-nm colloidal silica) were dispersed in polyethylene glycol in various compositions and compared with mono-dispersed STF. Bimodal STF in 30 and 35?wt.% (with different ratios of the two nanoparticles) and mono-disperse in 35, 40 and 45?wt.% of OX50 silica particles were prepared. Results showed a lower critical shear rate for the shear thickening in bimodal STF than that in mono-dispersed STF. Also, bimodal system results in reduced amount of nanoparticle used. Higher viscosities were also observed in different composition of bimodal system.