Surface Modification and Contact Interaction of Particles

Abstract

The effects of particle surface modification by ambient media and surfactant adsorption on the cohesive forces in the immediate contacts between individual particles have been studied with the CF (cohesive force) apparatus. The values of the free energy of interaction in direct coagulation contacts between particles of various types in liquids of different polarity and in the presence of various surfactants have been measured. They cover a broad range of several orders of magnitude; these interactions define the rheological properties of concentrated thixotropic systems and their stability with respect to peptization. A similar experimental technique has been used for studying active media influences on various physico-chemical processes of particle bridging and formation of the phase contacts responsible for the mechanical properties of related solid structures and their resistance to fracture. The effect of the adsorption induced decrease in strength and durability of such porous structures with phase contacts and compact solids is considered.

Antimicrobial Contribution of Chitosan Surface-Modified Nanoliposomes Combined with Colistin against Sensitive and Colistin-Resistant Clinical Pseudomonas aeruginosa

“…Therefore, at such concentrations, CST may begin to localize at the air-water surface, as well as in the solution bulk, where other association effects between the different peptide chains also start to take place, forming CST-CST aggregates. In this form, the peptide acts as a surfactant in an aqueous medium, decreasing the cohesive forces between water molecules located at the interface [35]. Finally, the CST-CST aggregates prevailed at the higher peptide concentrations in water (5 mg/mL) and PBS (2 mg/mL) ( Figure 1C).…”

Properties of complex ammonium nitrate-based fertilizers depending on the degree of phosphoric acid ammoniation

“…The reduction of caking can also be associated with a reduced ammonium chloride content with increasing M, which is apparent from intensity of peaks for NH 4 Cl in the presented X-ray patterns [1,18]. The reduction of static strength of granules can be the result of lower strength of phase contacts between granules with increase of M in the granulation process [19].…”