Detachment of Rough Colloids from Liquid-Liquid Interfaces.
Detachment of Rough Colloids from Liquid-Liquid Interfaces.
复制标题
粗糙胶体从液-液界面分离
DOI：
10.1021/acs.langmuir.8b00327
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
L. Isa
中科院分区：
文献类型：
--
作者：
M. Zanini;I. Lesov;E. Marini;C.-P. Hsu;C. Marschelke;A. Synytska;S. Anachkov;L. Isa
颗粒表面粗糙度和化学性质在新型颗粒基材料的设计中起着关键作用。虽然在文献中已经研究了粗糙颗粒的吸附，但是对这种颗粒的解吸仍然知之甚少。在这项工作中，我们特别专注于粗糙和化学改性的树莓状微粒从水/油界面使用胶体探针原子力显微镜的分离。我们观察到不同的接触线动力学发生在颗粒分离（钉扎与滑动），这取决于颗粒的粗糙度和表面改性。一般来说，表面粗糙度导致疏水性颗粒进入油中的解吸力降低，并提供了可以通过施加不同负载来访问的多个钉扎点。因此，我们的研究结果表明，未来的战略稳定和不稳定的皮克林乳液和泡沫。
Particle surface roughness and chemistry play a pivotal role in the design of new particle-based materials. Although the adsorption of rough particles has been studied in the literature, desorption of such particles remains poorly understood. In this work, we specifically focus on the detachment of rough and chemically modified raspberry-like microparticles from water/oil interfaces using colloidal-probe atomic force microscopy. We observe different contact-line dynamics occurring upon particle detachment (pinning vs sliding), depending on both the particle roughness and surface modification. In general, surface roughness leads to a reduction of the desorption force of hydrophobic particles into the oil and provides a multitude of pinning points that can be accessed by applying different loads. Our results hence suggest future strategies for stabilization and destabilization of Pickering emulsions and foams.