胶体
热泳
放松(心理学)
化学物理
对流
聚苯乙烯
稳态(化学)
Zeta电位
表面电荷
材料科学
机械
纳米技术
化学
纳米颗粒
物理
复合材料
物理化学
聚合物
社会心理学
纳米流体
心理学
作者
Jérôme Burelbach,Mykolas Zupkauskas,Robin Lamboll,Yang Lan,Erika Eiser
摘要
We present thermophoretic measurements in aqueous suspensions of three different polystyrene (PS) particles of varying negative charge, size, and surface coating. Our measurement technique is based on the observation of the colloidal steady-state distribution using conventional bright-field microscopy, which avoids undesirable effects such as laser-induced convection or local heating. We find that the colloids with the weakest zeta potential exhibit the strongest thermophoretic effect, suggesting that the Soret coefficient has a more intricate dependence on surface functionality than predicted by existing theoretical approaches. We also study the relaxation of the colloids to steady-state and propose a model to quantify the relaxation speed, based on the time evolution of the colloidal center of mass. Our observations are well described by this model and show that the relaxation speed tends to increase with the magnitude of the thermophoretic force.
科研通智能强力驱动
Strongly Powered by AbleSci AI