Sedimentation and stabilization of nano-fluids with dispersant
Sedimentation and stabilization of nano-fluids with dispersant
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DOI：
10.1016/j.colsurfa.2018.06.030
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
M. Abdullah;S. Malik;Muhammad Haseeb Iqbal;M. M. Sajid-M.;N. A. Shad;S. Hussain;Wasif Razzaq;Y. Javed
中科院分区：
文献类型：
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作者：
M. Abdullah;S. Malik;Muhammad Haseeb Iqbal;M. M. Sajid-M.;N. A. Shad;S. Hussain;Wasif Razzaq;Y. Javed
纳米流体的稳定性是衡量其有效性的主要参数之一。纳米颗粒的团聚降低了纳米流体的稳定性，从而影响了其技术相关特性。在这项研究中，氧化铝纳米颗粒（尺寸~ 50 nm）在有分散剂和没有分散剂的乙醇-水混合物中的稳定性进行了研究。采用聚甲基丙烯酸钠盐（SPMAA）作为分散剂。利用溶液高度随时间的变化、沉积照片和zeta电位技术分析了纳米流体的稳定性行为。研究并讨论了二元混合比例和分散体pH值的影响。结果表明，沉降、zeta电位和摄影技术三者之间存在较大的对应关系。SPMAA在低浓度（0.03 ml）下作为分散剂，对纳米流体的稳定性有负面影响。氧化铝的等电点在pH为7，但分散剂移向酸性区域（pH为4.5）。较高的二元混合物质量浓度（10%和90%）表现出良好的稳定性。
Stability of nanofluids is one of the major parameters which measures its effectiveness. The agglomeration of nanoparticles reduces the stability of nanofluids and consequently affects their technologically relevant properties. In this study, stability of alumina nanoparticles (size ∼ 50 nm) in ethanol-water mixture with and without dispersant has been investigated. Sodium salt of poly methacrylic acid (SPMAA) as a dispersant were used in this investigation. Clear solution height with respect to time, sedimentary photographs and zeta potential techniques have been used to analyze the stability behavior of nano-fluid. The effect of binary mixture proportions and dispersion’s pH has been investigated and discussed. The results showed that sedimentation, zeta potential and photographic techniques have a great correspondence with each other. SPMAA has been used as the dispersant in low concentration (0.03 ml) and has a negative impact on the stability of nano-fluids. The isoelectric point of alumina found to be at pH 7 but with dispersant shifted towards acidic region (pH 4.5). Higher binary mixture concentrations (10% and 90%) by weight exhibited good stability.