Marquez Maricel, Robben Amanda, Grady Brian P, Robb Ian
Department of Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, OK 73019, USA.
J Colloid Interface Sci. 2006 Mar 15;295(2):374-87. doi: 10.1016/j.jcis.2005.10.016. Epub 2005 Nov 9.
A custom-designed apparatus termed the yield stress adaptor (YSA) has been used to evaluate the effect of polymer-surfactant coatings, and the addition of nanoparticles of different size, shape and surface chemistry, on the rheological properties of large hydrophilic particulates, sand, with the aim of reducing interparticle friction forces. Experimental results show that the flow properties of sand slurries at high volume fractions of sand (>50%) can be significantly enhanced by adding nanoparticles, and by surface modification with polymer/surfactant mixtures. A lesser effect is observed for polymer-only and surfactant-only coated samples. X-ray photoelectron spectroscopy was used to determine the concentration of organic species at the surface. The effect of polymer/surfactant concentration, adsorption time, polymer molecular weight, as well as surfactant charge and chemical structure were also addressed.
一种名为屈服应力适配器（YSA）的定制装置已被用于评估聚合物-表面活性剂涂层以及添加不同尺寸、形状和表面化学性质的纳米颗粒对大型亲水性颗粒（沙子）流变特性的影响，目的是降低颗粒间摩擦力。实验结果表明，通过添加纳米颗粒以及用聚合物/表面活性剂混合物进行表面改性，可显著提高高砂体积分数（>50%）下沙浆的流动性能。对于仅用聚合物和仅用表面活性剂涂层的样品，观察到的效果较小。利用X射线光电子能谱确定表面有机物种的浓度。还探讨了聚合物/表面活性剂浓度、吸附时间、聚合物分子量以及表面活性剂电荷和化学结构的影响。
