Probing particle heteroaggregation using analytical centrifugation.
Probing particle heteroaggregation using analytical centrifugation.
复制标题
使用离心分析法探测颗粒异质聚集
作者：
M. Rey;M.J. Uttinger;W. Peukert;J. Walter;N. Vogel
胶体颗粒的控制聚集不仅是一种普遍的自然现象，而且还可以作为一种工具来设计具有定制形状和功能的复杂积木。然而，对这种异质聚集过程的定量描述仍然具有挑战性。在这里，我们演示了使用分析离心法来表征二氧化硅颗粒和具有相似表面电荷的软微凝胶的异质聚集。我们考察了颗粒与微凝胶表面比、微凝胶尺寸和温度的影响下形成的异质聚集体的附着性和稳定性。微凝胶附着在胶体颗粒上会引起沉淀系数的变化，该系数用于定量识别附着的微凝胶的数量。我们用改进的布朗动力学算法对异质聚集体的摩擦性质进行了计算机模拟，证实了沉降系数的变化。理论研究和实验结果的比较表明，微凝胶在附着时会变形和变平。
The controlled aggregation of colloidal particles is not only a widespread natural phenomenon but also serves as a tool to design complex building blocks with tailored shape and functionalities. However, the quantitative characterization of such heteroaggregation processes remains challenging. Here, we demonstrate the use of analytical centrifugation to characterize the heteroaggregation of silica particles and soft microgels bearing similar surface charges. We investigate the attachment as well as the stability of the formed heteroaggregates as a function of particle to microgel surface ratio, microgel size and the influence of temperature. The attachment of microgels onto the colloidal particles induces a change in the sedimentation coefficient, which is used to quantitatively identify the number of attached microgels. We corroborate the shift in sedimentation coefficient by computer simulations of the frictional properties of heteroaggregates via a modified Brownian dynamic algorithm. The comparison between theoretical investigations and experiments suggest that the microgels deform and flatten upon attachment.
登录
查看更多内容
影响因子：
3.9
作者：
Harrer, Johannes;Rey, Marcel;Vogel, Nicolas
通讯作者：
Vogel, Nicolas
影响因子：
7.015
作者：
Gaulding, Jeffrey C.;Saxena, Shalini;Lyon, L. Andrew
通讯作者：
Lyon, L. Andrew
影响因子：
17.1
作者：
Walter, Johannes;Loehr, Konrad;Coelfen, Helmut
通讯作者：
Coelfen, Helmut
纳米颗粒的正交运动异质聚集：粒径比对聚集体特性的影响
DOI：
10.1016/j.colsurfa.2008.05.030
发表时间：
2008
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
--
作者：
P. Yates;G. Franks;G. Jameson
通讯作者：
G. Jameson
影响因子：
64.8
作者：
Gong, Zhe;Hueckel, Theodore;Sacanna, Stefano
通讯作者：
Sacanna, Stefano