Thermosensitive hard spheres

被引：5

作者：

Clements, Matthew

Pullela, Srinivasa Rao

Mejia, Andres F.

Shen, Jingyi

Gong, Tieying

Cheng, Zhengdong ^{[1
]}

机构：

[1] Texas A&M Univ, Artie McFerrin Dept Chem Engn, College Stn, TX 77843 USA

[2] Uni Ind Santander, Dept Chem Engn, Bucaramanga, Colombia

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2008年 / 317卷 / 01期

关键词：

thermosensitive colloids; crystal melting; PNIPAM-co-acrylic acid; hard spheres;

D O I：

10.1016/j.jcis.2007.09.010

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 demonstrate an extension of a UV-Vis spectroscopy method to determine the phase boundaries for thermosensitive colloids as an alternative to the time-consuming sedimentation method. The Bragg attenuation peak from colloidal crystallites was monitored during the quasi-equilibrium colloidal crystal melting. The melting and freezing boundaries of the coexistence region were determined via a blue shift of Bragg's peak and the disappearance of peak area. We confirm this method using poly(N-isopropylacrylamide) (PNIPAM) particles at different charge densities and temperatures far below the lower critical solution temperature. At low pH, the particles behave as thermosensitive hard spheres. (c) 2007 Elsevier Inc. All rights reserved.

引用

页码：96 / 100

页数：5

共 36 条

[31] DYNAMIC LIGHT-SCATTERING STUDY OF THE GLASS-TRANSITION IN A COLLOIDAL SUSPENSION [J].