氧化碳纳米角(CNHox)水悬浮液的流变行为

Nanomaterials Pub Date : 2024-07-25 DOI:10.3390/nano14151247
Ayumi Moteki, Motoyoshi Kobayashi
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摘要

氧化碳纳米角(CNHox)是一种碳纳米材料,因其独特的材料特性而备受关注。它有望应用于癌症治疗、基因表达技术、高导热液体、润滑剂等多个领域。悬浮液的流变测量可提供悬浮颗粒的有效尺寸和相互作用的信息,但对 CNHox 水悬浮液的流变行为却从未进行过系统研究。为了明确 CNHox 水悬浮液的流变行为,我们测量了其在颗粒浓度和盐浓度变化时的粘度和动态粘弹性。CNHox 悬浮液的粘度在低剪切速率下表现出屈服应力,随着剪切速率的增加表现出剪切稀化行为。5 重量百分比 CNHox 悬浮液的粘度与 60 重量百分比二氧化硅悬浮液的粘度相当。低 CNHox 浓度下的高粘度可能是由于 CNHox 颗粒的多孔结构和较大的有效体积。根据 Krieger-Dougherty 方程计算得出的 CNHox 估计有效体积比根据质量浓度和密度计算得出的实际体积大 18.9 倍。与胶体二氧化硅悬浮液相比,CNHox 悬浮液的流变行为对盐浓度的依赖性较弱。这种对盐浓度的微弱依赖性可能是由于颗粒表面粗糙,从而削弱了颗粒间双层电相互作用和/或范德华相互作用的效果。本研究中显示的 CNHox 水悬浮液的这些流变行为将有助于提高其在各种应用中的使用效率。
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Rheological Behavior of an Aqueous Suspension of Oxidized Carbon Nanohorn (CNHox)
Oxidized carbon nanohorn (CNHox) a carbon nanomaterial that has attracted attention due to its unique material properties. It is expected to be applied in various areas like cancer treatment, gene-expression technology, fluids with high thermal conductivity, lubricants, and so on. While the rheological measurements of suspensions provide information on the effective size and interactions of suspended particles, the rheological behaviors of aqueous suspensions of CNHox have never been systematically investigated. To clarify the rheological behaviors of aqueous suspensions of CNHox, their viscosity and dynamic viscoelasticity were measured with changing particle concentration and salt concentration. The viscosity of a CNHox suspension showed yield stress at low shear rates and showed shear-thinning behavior with increasing shear rates. The viscosity of 5 weight % CNHox suspensions was comparable to that of 60 weight % silica suspensions. This high viscosity at a low CNHox concentration is probably due to the porous structure and large effective volume of the CNHox particle. The estimated effective volume of CNHox calculated by the Krieger−Dougherty equation was 18.9 times larger than the actual volume calculated by the mass concentration and density. The dependence of rheological behavior of the CNHox suspension on salt concentration was weak compared to that of the colloidal silica suspension. This weak dependence on salt concentration may be due to the roughness of the particle surface, which would weaken the effect of electric double-layer interactions and/or van der Waals interactions between particles. These rheological behaviors of the aqueous suspension of CNHox shown in this research will be useful in efforts to improve the efficiency of its utilization for the various applications.
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