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Forces between different latex particles in aqueous electrolyte solutions measured with the colloidal probe technique
Author(s) -
RuizCabello F. Javier Montes,
MoazzamiGudarzi Mohsen,
ElzbieciakWodka Magdalena,
Maroni Plinio
Publication year - 2017
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22656
Subject(s) - dlvo theory , colloid , particle (ecology) , colloidal particle , surface charge , nanometre , chemical physics , surface force , electrolyte , chemistry , nanotechnology , atomic force microscopy , materials science , classical mechanics , physics , composite material , oceanography , electrode , geology
In this article, a compilation of results on direct force measurements between colloidal particles in monovalent salts carried out with the colloidal probe technique based on Atomic Force Microscopy was presented. The interaction forces between similar and dissimilar particles was studied and it was concluded that, in general, these force profiles may be satisfactorily quantified by the DLVO theory down to distances of few nanometers. However, in the specific case where the charge of one of the involved particle is close to neutral, it was found that the surface potential of this particle may change its sign depending on the sign of charge of the opposite particle. In this respect, the assumption that the surface potential of a particle is a property only related to the particle surface features and the bulk properties is called into question. Microsc. Res. Tech. 80:144–152, 2017 . © 2016 Wiley Periodicals, Inc.