Compression of hard core-soft shell nanoparticles at liquid-liquid interfaces: influence of the shell thickness

被引:77
|
作者
Rauh, A. [1 ]
Rey, M. [2 ]
Barbera, L. [2 ]
Zanini, M. [2 ]
Karg, M. [1 ,3 ]
Isa, L. [2 ]
机构
[1] Univ Bayreuth, Phys Chem, Univ Str 30, D-95440 Bayreuth, Germany
[2] ETH, Dept Mat, Lab Interfaces Soft matter & Assembly, Vladimir Prelog Weg 5, CH-8093 Zurich, Switzerland
[3] Heinrich Heine Univ, Phys Chem, D-40204 Dusseldorf, Germany
关键词
POLY(N-ISOPROPYLACRYLAMIDE) MICROGELS; FLUID INTERFACES; EMULSION STABILIZERS; COLLOIDAL PARTICLES; SENSITIVE MICROGELS; STRUCTURAL-CHANGES; TEMPERATURE; ADSORPTION; MICROSCOPY; MONOLAYERS;
D O I
10.1039/c6sm01020b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Soft hydrogel particles show a rich structural and mechanical behaviour compared to hard particles, both in bulk and when confined in two dimensions at a fluid interface. Moreover, encapsulation into hydrogel shells makes it possible to transfer the tunability of soft steric interactions to hard nanoparticle cores, which bear interest for applications, e.g. in terms of optical, magnetic and reinforcement properties. In this work, we investigate the microstructures formed by hard core-soft shell particles at liquid-liquid interfaces upon compression. We produced model particles with the same silica core and systematically varied the shell-to-core ratio by synthesising shells with three different thicknesses. These particles were spread at an oil-water interface in a Langmuir-Blodgett trough and continuously transferred onto a solid support during compression. The transferred microstructures were analysed by atomic force and scanning electron microscopy. Quantitative image analysis provided information on the particle packing density, the interparticle distance, and the degree of order of the monolayers. We discovered several essential differences compared to purely soft hydrogel particles, which shed light on the role played by the hard cores in the assembly and compression of these composite monolayers.
引用
收藏
页码:158 / 169
页数:12
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