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首页> 外文期刊>ACS Omega >Anisotropic Nanoparticles Contributing to Shear-Thickening Behavior of Fumed Silica Suspensions
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Anisotropic Nanoparticles Contributing to Shear-Thickening Behavior of Fumed Silica Suspensions

机译：各向异性纳米粒子有助于气相二氧化硅悬浮液的剪切增稠行为

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摘要

Rheological characteristics of a concentrated suspension can be tuned using anisotropic particles having various shapes and sizes. Here, the role of anisotropic nanoparticles, such as surface-functionalized multiwall carbon nanotubes (MWNTs) and graphene oxide nanoplatelets (GONPs), on the rheological behavior of fumed silica suspensions in poly(ethylene glycol) (PEG) is investigated. In these mixed-particle suspensions, the concentrations of MWNTs and GONPs are much lower than the fumed silica concentration. The suspensions are stable, and hydrogen-bonded PEG solvation layers around the particles inhibit their flocculation. Fumed silica suspensions over the concentration range considered here display shear-thickening behavior. However, for a larger concentration of MWNTs and with increasing aspect ratios, the shear-thickening behavior diminishes. In contrast, a distinct shear-thickening response has been observed for the GONP-containing suspensions for similar mass fractions (MFs) of MWNTs. For these suspensions, shear thickening is achieved at a lower solid MFs compared to the suspensions consisting of only fumed silica. A significant weight reduction of shear-thickening fluids that can be achieved by this approach is beneficial for many applications. Our results provide guiding principles for controlling the rheological behavior of mixed-particle systems relevant in many fields.
机译：可以使用具有各种形状和尺寸的各向异性颗粒来调节浓缩悬浮液的流变特性。在这里，研究了各向异性纳米颗粒（如表面功能化的多壁碳纳米管（MWNTs）和氧化石墨烯纳米片（GONPs））对气相法二氧化硅悬浮液在聚乙二醇（PEG）中的流变行为的影响。在这些混合颗粒悬浮液中，MWNT和GONP的浓度远低于气相二氧化硅的浓度。悬浮液是稳定的，并且颗粒周围的氢键合PEG溶剂化层抑制了它们的絮凝。在此处考虑的浓度范围内的气相二氧化硅悬浮液显示出剪切增稠行为。但是，对于更大浓度的MWNT，随着纵横比的增加，剪切增稠行为会减弱。相反，对于MWNT的相似质量分数（MF），已观察到含GONP的悬浮液有明显的剪切增稠响应。对于这些悬浮液，与仅由气相法二氧化硅组成的悬浮液相比，在较低的固体MF下可实现剪切增稠。通过这种方法可以显着减少增稠剪切液的重量，这对许多应用都是有益的。我们的结果为控制与许多领域相关的混合粒子系统的流变行为提供了指导原则。

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