A model colloidal gel for coordinated measurements of force, structure, and rheology
A model colloidal gel for coordinated measurements of force, structure, and rheology
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用于协调测量力、结构和流变学的胶体凝胶模型
DOI：
10.1122/1.4884965
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发表时间：
2013
影响因子：
3.3
通讯作者：
E. Furst
中科院分区：
文献类型：
--
作者：
L. Hsiao;Kathryn A. Whitaker;M. Solomon;E. Furst
我们介绍了一个模型凝胶系统，其中胶体的力量，结构和流变学测量的流变学和显微镜技术与光镊的平衡的要求。空间稳定的聚（甲基丙烯酸甲酯）胶体悬浮在环己烷（CH）和环己基溴（CHB）与稀释的聚苯乙烯作为消耗剂。作为CH/CHB溶剂组合物的函数的凝胶的光阱强度，流变学和微观结构的研究确定了这些测量可以应用于表征凝胶性质的条件。结果表明，包含37%重量分数CH（wCH = 0.37）的溶剂提供足够的折射率对比度以实现光学捕获，同时保持良好的共焦显微镜成像质量和对本体流变学的最小沉降效应。在此条件下，在稀释剂浓度c = 8.64 mg/ml（c/c* = 0.81）下，稀释样品中的光学捕获结果显示50.
We introduce a model gel system in which colloidal forces, structure, and rheology are measured by balancing the requirements of rheological and microscopy techniques with those of optical tweezers. Sterically stabilized poly(methyl methacrylate) colloids are suspended in cyclohexane (CH) and cyclohexyl bromide (CHB) with dilute polystyrene serving as a depletion agent. A study of the optical trap strength, rheology, and microscopic structure of the gels as a function of CH/CHB solvent composition identifies the conditions for which these measurements can be applied to characterize gel properties. The results indicate that a solvent comprising 37% weight fraction CH (wCH = 0.37) provides sufficient refractive index contrast to enable optical trapping, while maintaining good confocal microscopy imaging quality and minimal sedimentation effects on the bulk rheology. At this condition, and at a depletant concentration c = 8.64 mg/ml (c/c* = 0.81), results from optical trapping in a dilute sample show that 50...
影响因子：
6.2
作者：
Ganesan, Mahesh;Stewart, Elizabeth J.;Szafranski, Jacob;Satorius, Ashley E.;Younger, John G.;Solomon, Michael J.
通讯作者：
Solomon, Michael J.
影响因子：
8.6
作者：
Ballesta, P.;Besseling, R.;Poon, W. C. K.
通讯作者：
Poon, W. C. K.