Effects of Polymers on Particle Adsorption on Macroscopic Surfaces Studied by Optical Reflectometry

✍ Scribed by Marcel R. Böhmer

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 107 KB
• Volume: 197
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5237

✦ Synopsis

with the effective hard sphere concept of Adamczyk et al.

The adsorption of nanometer-sized silica particles on a macro- (1,3). The kinetics are most likely of a diffusion enhanced scopic silica surface pretreated with different polymers was studied random sequential adsorption type (15) as anticipated by using optical reflectometry in a stagnation point flow cell. Efficient Adamczyk and Warszynski (1).

sticking of particles occurs only when no electrostatic repulsion

In this paper, we will focus on the effects that polymers have between particles and surface exists. Cationic polyelectrolytes, e.g., on the kinetics of particle adsorption. Polymer pretreatment of partially methylated poly(vinylimidazole), are very efficient in the surface is known to alter the deposition of particles (6inducing adsorption of negatively charged SiO 2 particles. Competi-8). We study the effect of polymer chain length and charge tion between the negatively charged SiO 2 particles and an anionic using partially methylated poly(vinyl-imidazole) ( 16). Polypolymer present in the suspension reduces the amount of particles adsorbed on the surface. Adsorbed nanometer-sized silica particles mers in suspension may also affect particle adhesion (6-8). do not become embedded in the adsorbed polymer layer but rather If the surface is pretreated with a positively charged and both stay on the periphery of this layer on the time scale of the experinegatively charged particles and negatively charged polymers ment (15 min). Therefore, repeated sequential addition of adare present in the suspension a competition between polymer sorbing polymer and particles will lead to controllable high and particles for the pretreated surface will occur. We study amounts of particles on the surface. ᭧ 1998 Academic Press this situation using polyacrylic acid (PAA) and silica particles.