Experimental Evidence of Hydration Forces between Polymer Colloids Obtained by Photon Correlation Spectroscopy Measurements
✍ Scribed by J.M. Delgado-Calvo-Flores; J.M. Peula-Garcı́a; R. Martı́nez-Garcı́a; J. Callejas-Fernández
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 167 KB
- Volume
- 189
- Category
- Article
- ISSN
- 0021-9797
No coin nor oath required. For personal study only.
✦ Synopsis
The measurement both of the diffusion coefficient (deter-Measurements have been done of the effective diffusion coeffimination of the hydrodynamic radius) and electrophoretic cient versus ionic strength (KBr) of isolated monodisperse polystymobility are usually the starting point to discuss the validity rene particles (É200 nm in diameter) with different superficial of these models. However, the influence that the particlegroups, sulfonated and carboxylic, via photon correlation spectrosparticle interaction exerts on the diffusion coefficient meacopy (PCS). The sulfonated latexes behave as could be expected surements is commonly overlooked.
according to the DLVO theory of colloidal stability. However, the In colloidal science, the knowledge of particle-particle carboxylic latexes exhibit a stabilization at ionic strengths higher interaction is the aim of many studies. Batchelor (2) studied than their c.c.c. Although the hairy layer model can explain the the influence of particle concentration on the Brownian results below the c.c.c. it cannot explain restabilization. Due to both the charge and the hydrophilic character of our carboxylic movement of spherical particles interacting with each other. latexes, we suggest the possible existence of a hydration force at Felderhof (3) examined a similar problem with hard spheres, high salt concentration. This would give rise to a repulsive interacobtaining similar results. Finsy et al. ( 4) carried out studies tion energy between particles that could be responsible for stabilion the diffusion coefficient of water microemulsions in a zation of these systems at high ionic strengths. ᭧ 1997 Academic Press benzene and buthanol mixture.