2016/06/01 by Gregor Trefalt, Trefalt, Gregor, Thomas Palberg +3 · 2 citations
Chemistry · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Electrostatics and Colloid Interactions #FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft) #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.48550/arxiv.1606.00266
openalex publication_date 2016/06/01 · openalex created_date 2022/09/28 · openalex updated_date 2026/07/28
The present article provides an overview of the recent progress in the direct\nforce measurements between individual pairs of colloidal particles in aqueous\nsalt solutions. Results obtained by two different techniques are being\nhighlighted, namely with the atomic force microscope (AFM) and optical\ntweezers. One finds that the classical theory of Derjaguin, Landau, Verwey, and\nOverbeek (DLVO) represents an accurate description of the force profiles even\nin the presence of multivalent ions, typically down to distances of few\nnanometers. However, the corresponding Hamaker constants and diffuse layer\npotentials must be extracted from the force profiles. At low salt\nconcentrations, double layer forces remain repulsive and may become long\nranged. At short distances, additional short range non-DLVO interactions may\nbecome important. Such an interaction is particularly relevant in the presence\nof multivalent counterions.\n