Enhanced rheological performance of shear thickening fluids: effects of graphene oxide nanoplatelets and clay nanoparticles

IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL
Sajjad Astaraki, Hanieh Easavinejad, Hosein Hasannezhad, Seyed Reza Payami, Yaser Bagheri, Sayed Hassan Nourbakhsh, Ata Khabaz-Aghdam
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Abstract

This study investigates the effects of graphene oxide nanoplatelets (GNPs) and bentonite clay nanoparticles on the rheological behavior of shear thickening fluids (STFs). STFs, which exhibit rapid viscosity increases under shear stress, were formulated using a base suspension of 35% silica nanoparticles in polyethylene glycol (PEG) and reinforced with either 2.5% or 5% GNPs or 2.5% clay. Rheological tests, including shear rate, frequency, and temperature sweeps, were conducted to analyze peak viscosity, critical viscosity, and the crossover points of storage modulus (G') and loss modulus (G''). Results reveal that GNPs significantly enhance the STF’s viscosity and shear sensitivity, with the 5% GNP-reinforced STF demonstrating the highest peak viscosity and lowest shear rates required for thickening, along with superior rigidity. Temperature-dependent testing highlights a marked decrease in viscosity with rising temperatures, attributable to increased molecular mobility. Frequency and strain-dependent analyses show that GNP-reinforced STFs offer greater structural integrity under dynamic loads, with the 5% GNP STF showing a quick transition to fluid-like behavior at higher moduli. This study underscores the value of GNPs, especially at higher concentrations, in tailoring STF properties for applications in impact resistance and adaptive damping.

Graphical Abstract

Abstract Image

增强剪切增稠流体的流变性能:氧化石墨烯纳米片和粘土纳米颗粒的影响
本研究探讨了氧化石墨烯纳米片(GNPs)和膨润土纳米粒对剪切增稠流体(STFs)流变行为的影响。STFs在剪切应力下表现出快速的粘度增加,采用35%的二氧化硅纳米颗粒和聚乙二醇(PEG)为基础悬浮液,并用2.5%或5%的GNPs或2.5%的粘土进行增强。流变学测试包括剪切速率、频率和温度扫描,以分析峰值粘度、临界粘度以及存储模量(G’)和损失模量(G’)的交叉点。结果表明,GNPs显著提高了STF的粘度和剪切敏感性,5% gnp增强的STF表现出最高的峰值粘度和最低的增稠剪切速率,同时具有优越的刚性。温度依赖性测试表明,由于分子迁移率的增加,粘度随着温度的升高而显著降低。频率和应变相关分析表明,GNP增强的STF在动载荷下具有更高的结构完整性,5% GNP增强的STF在较高模数下表现出快速过渡到类流体行为。这项研究强调了GNPs的价值,特别是在较高浓度下,在调整STF性能以用于抗冲击和自适应阻尼方面的应用。图形抽象
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来源期刊
Colloid and Polymer Science
Colloid and Polymer Science 化学-高分子科学
CiteScore
4.60
自引率
4.20%
发文量
111
审稿时长
2.2 months
期刊介绍: Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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