Physics of Complex Fluids Group, Dept. Science and Technology, University of Twente, Enschede, The Netherlands.
Physics of Complex Fluids Group, Dept. Science and Technology, University of Twente, Enschede, The Netherlands; Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Wageningen, The Netherlands.
Adv Colloid Interface Sci. 2015 Aug;222:215-27. doi: 10.1016/j.cis.2014.09.003. Epub 2014 Sep 19.
Soft microgel particles inherently possess qualities of both polymers as well as particles. We review the similarities and differences between soft microgel particles and stiff colloids at fluid-fluid interfaces. We compare two fundamental aspects of particle-laden interfaces namely the adsorption kinetics and the interactions between adsorbed particles. Although it is well established that the transport of both hard particles and microgels to the interface is driven by diffusion, the analysis of the adsorption kinetics needs reconsideration and a proper equation of state relating the surface pressure to the adsorbed mass should be used. We review the theoretical and experimental investigations into the interactions of particles at the interface. The rheology of the interfacial layers is intimately related to the interactions, and the differences between hard particles and microgels become pronounced. The assembly of particles into the layer is another distinguishing factor that separates hard particles from soft microgel particles. Microgels deform substantially upon adsorption and the stability of a microgel-stabilized emulsion depends on the conformational changes triggered by external stimuli.
软质微凝胶颗粒本质上兼具聚合物和颗粒的特性。我们综述了软质微凝胶颗粒和刚性胶体在流体-流体界面上的异同。我们比较了负载颗粒界面的两个基本方面，即吸附动力学和吸附颗粒之间的相互作用。尽管已经证实硬颗粒和微凝胶向界面的输运是由扩散驱动的，但对吸附动力学的分析需要重新考虑，应该使用一个适当的状态方程将表面压力与吸附质量联系起来。我们综述了对界面处颗粒相互作用的理论和实验研究。流变学与相互作用密切相关，硬颗粒和微凝胶之间的差异变得明显。颗粒在层中的组装是将硬颗粒与软质微凝胶颗粒区分开来的另一个区别因素。微凝胶在吸附时会发生显著的变形，而微凝胶稳定乳液的稳定性取决于外部刺激引发的构象变化。
