Surface tension anomaly observed for chemically-modified Janus particles at the air/water interface
Surface tension anomaly observed for chemically-modified Janus particles at the air/water interface
复制标题
DOI：
10.1016/j.jcis.2019.09.084
复制
发表时间：
2020-01-15
影响因子：
9.9
通讯作者：
Kretzschmar, Ilona
中科院分区：
文献类型：
--
作者：
Razavi, Sepideh;Hernandez, Laura M.;Kretzschmar, Ilona
研究了由在一个半球上装饰有金纳米颗粒的核心二氧化硅颗粒制成的 Janus 颗粒在空气/水界面的行为。在这些化学改性的 Janus 颗粒存在下，观察到有效表面张力出人意料地降低。对各种对照颗粒的界面行为进行的实验，包括由涂有薄金层的相同核心二氧化硅颗粒制成的物理改性的 Janus 颗粒，没有表现出显着的表面张力效应。我们假设需要对 Janus 结构形式的颗粒进行化学修饰，以改变表面张力，并将这些颗粒的类似表面活性剂的行为归因于浸没力的存在。 (C) 2019 Elsevier Inc. 保留所有权利。
The behavior of Janus particles fabricated from core silica particles decorated with gold nanoparticles on one hemisphere is studied at the air/water interface. An unexpected reduction in the effective surface tension is observed in the presence of these chemically-modified Janus particles. Experiments on the interfacial behavior of a variety of control particles, including the physically-modified Janus particles made from the same core silica particles coated with a thin gold layer, do not exhibit significant surface tension effects. We hypothesize that the chemical modification of particles in form of a Janus structure is needed to alter the surface tension and attribute the surfactant-like behavior of these particles to the presence of immersion forces. (C) 2019 Elsevier Inc. All rights reserved.