Polymer Science and Engineering Department, University of Massachusetts Amherst , 120 Governors Drive, Amherst, Massachusetts 01003, United States.
Key Laboratory of Rubber-Plastics, College of Polymer Science and Engineering, Qingdao University of Science and Technology , Qingdao 266042, P. R. China.
Nano Lett. 2017 Nov 8;17(11):6855-6862. doi: 10.1021/acs.nanolett.7b03159. Epub 2017 Oct 25.
Nanoparticles (NPs) segregated to the liquid/liquid interface form disordered or liquid-like assemblies that show diffusive motions in the plane of the interface. As the areal density of NPs at the interface increases, the available interfacial area decreases, and the interfacial dynamics of the NP assemblies change when the NPs jam. Dynamics associated with jamming was investigated by X-ray photon correlation spectroscopy. Water-in-toluene emulsions, formed by a self-emulsification at the liquid/liquid interface and stabilized by ligand-capped CdSe-ZnS NPs, provided a simple, yet powerful platform, to investigate NP dynamics. In contrast to a single planar interface, these emulsions increased the number of NPs in the incident beam and decreased the absorption of X-rays in comparison to the same path length in pure water. A transition from diffusive to confined dynamics was manifested by intermittent dynamics, indicating a transition from a liquid-like to a jammed state.
纳米粒子（NPs）在液/液界面上分离形成无序或液态的组装体，在界面平面内表现出扩散运动。随着界面上 NPs 的堆积密度增加，可用的界面面积减小，当 NPs 发生堵塞时，NP 组装体的界面动力学发生变化。通过 X 射线光子相关光谱研究了与堵塞相关的动力学。水/甲苯乳液通过在液/液界面上的自乳化形成，并通过配体封端的 CdSe-ZnS NPs 稳定，为研究 NP 动力学提供了一个简单而强大的平台。与单个平面界面相比，这些乳液增加了入射光束中的 NPs 数量，并降低了与纯水中相同路径长度相比的 X 射线吸收。从扩散到受限动力学的转变表现为间歇性动力学，表明从液态到堵塞状态的转变。
