Temperature-sensitive poly(N-Isopropyl-Acrylamide) microgel particles: A light scattering study

被引：78
作者：
Reufer, M. [1 ,2 ]
Diaz-Leyva, P. [1 ,2 ]
Lynch, I. [3 ]
Scheffold, F. [1 ,2 ]
机构：
[1] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland
[2] Univ Fribourg, Fribourg Ctr Nanomat, CH-1700 Fribourg, Switzerland
[3] Univ Coll Dublin, Sch Chem & Chem Biol, Dublin 4, Ireland
来源：
EUROPEAN PHYSICAL JOURNAL E | 2009年 / 28卷 / 02期
基金：
瑞士国家科学基金会;
关键词：
VOLUME PHASE-TRANSITION; POLY N-ISOPROPYLACRYLAMIDE; ANGLE X-RAY; NEUTRON-SCATTERING; COLLOIDAL CRYSTALS; LATEX-PARTICLES; BEHAVIOR; SUSPENSIONS; RHEOLOGY;
D O I：
10.1140/epje/i2008-10387-2
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：
We present a light scattering study of aqueous suspensions of microgel particles consisting of poly(N-Isopropyl-Acrylamide) cross-linked gels. The solvent quality for the particles depends on temperature and thus allows tuning of the particle size. The particle synthesis parameters are chosen such that the resulting high surface charge of the particles prevents aggregation even in the maximally collapsed state. We present results on static and dynamic light scattering (SLS/DLS) for a highly diluted sample and for diffuse optical transmission on a more concentrated system. In the maximally collapsed state the scattering properties are well described by Mie theory for homogenous hard spheres. Upon swelling we find that a radially inhomogeneous density profile develops.
引用
收藏
页码：165 / 171
页数：7
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