title: Impact of lipopolysaccharide coating on clay particle wettability.
abstract: Impact of lipopolysaccharide coating on kaolinite and Na-montmorillonite wettability was investigated. Kaolinite had greater diiodomethane contact angles, smaller water and formamide contact angles than Na-montmorillonite. After lipopolysaccharide coating, diiodomethane and formamide contact angles decreased, while water contact angles increased for both kaolinite and Na-montmorillonite. The decrease and increase in liquid contact angles after lipopolysaccharide coating were most pronounced for lipopolysaccharide extracted from Pseudomonas aeruginosa, followed by Pseudomonas fluorescens and Echerichia coli. Clay particle wettability was determined by particle surface thermodynamic properties. Both kaolinite and Na-montmorillonite exhibited a monopolar surface and the monopolarity decreased after lipopolysaccharide coating, indicating an increase in hydration or surface wetness. The origins of interactions of clay particles with water molecules were discussed and related to clay particle water wettability.
authors.affiliation: Department of Crop and Soil Sciences, Washington State University, Johnson Hall RM243E, Pullman, WA 99164, USA. chen9046@wsu.edu
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Honglong
authors.initials: H
authors.lastname: Zhu
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry; D000077215:Clay; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D007616:Kaolin / Q000737:chemistry; D008070:Lipopolysaccharides / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D017155:Wettability
chemical_list: D000538:Aluminum Silicates; D020099:Coated Materials, Biocompatible; D008070:Lipopolysaccharides; D001546:Bentonite; D007616:Kaolin; D000077215:Clay