【Research News】Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
We report that surfaces of "polymer hydrogels" (gelatin desserts, for example, and also the most part of human bodies) tend to significantly adsorb fine particles in water, even when no special adsorbent is present in the gels. This is because van der Waals (vdW) attraction, which is universal force acting between two materials, is sufficiently strong for the particle/gel in water. This finding will advance the development in various types of soft materials for pharmaceutical and biomedical applications.
An illustration showing the particle adsorption onto polymer gels (top); Optical micrographs for the adsorbed particles on the gels in pure water (bottom, left) and on reducing the vdW force (10% of that in water); Particle, silica, 500 nm; gel, poly(acrylamide); medium, an aqueous solution of ethylene glycol.
Published online Date :21 July, 2017
|Title||Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction|
|Author||Naoko Sato, Yurina Aoyama, Junpei Yamanaka, Akiko Toyotama, Tohru Okuzono|