Böhmer MR
Philips Research Laboratories Eindhoven (WA04), Prof. Holstlaan 4, Eindhoven, 5656 AA, The Netherlands
J Colloid Interface Sci. 1998 Jan 15;197(2):251-6. doi: 10.1006/jcis.1997.5237.
The adsorption of nanometer-sized silica particles on a macroscopic silica surface pretreated with different polymers was studied using optical reflectometry in a stagnation point flow cell. Efficient sticking of particles occurs only when no electrostatic repulsion between particles and surface exists. Cationic polyelectrolytes, e.g., partially methylated poly(vinylimidazole), are very efficient in inducing adsorption of negatively charged SiO2 particles. Competition between the negatively charged SiO2 particles and an anionic polymer present in the suspension reduces the amount of particles adsorbed on the surface. Adsorbed nanometer-sized silica particles do not become embedded in the adsorbed polymer layer but rather stay on the periphery of this layer on the time scale of the experiment (15 min). Therefore, repeated sequential addition of adsorbing polymer and particles will lead to controllable high amounts of particles on the surface. Copyright 1998 Academic Press. Copyright 1998Academic Press
利用驻点流动池中的光学反射法，研究了纳米级二氧化硅颗粒在经不同聚合物预处理的宏观二氧化硅表面上的吸附情况。只有当颗粒与表面之间不存在静电排斥时，颗粒才会有效黏附。阳离子聚电解质，例如部分甲基化的聚（乙烯基咪唑），在诱导带负电荷的SiO2颗粒吸附方面非常有效。带负电荷的SiO2颗粒与悬浮液中存在的阴离子聚合物之间的竞争会减少吸附在表面的颗粒数量。在实验时间尺度（15分钟）内，吸附的纳米级二氧化硅颗粒不会嵌入吸附的聚合物层中，而是停留在该层的外围。因此，重复依次添加吸附聚合物和颗粒将导致表面上可控的大量颗粒。版权所有1998年学术出版社。版权所有1998年学术出版社
