Influence of Nanoscale Surface Roughness on Colloidal Force Measurements

Langmuir : the ACS Journal of Surfaces and Colloids
Yi ZouGuangzhao Mao

Abstract

Forces between colloidal particles determine the performances of many industrial processes and products. Colloidal force measurements conducted between a colloidal particle AFM probe and particles immobilized on a flat substrate are valuable in selecting appropriate surfactants for colloidal stabilization. One of the features of inorganic fillers and extenders is the prevalence of rough surfaces-even the polymer latex particles, often used as model colloidal systems including the current study, have rough surfaces albeit at a much smaller scale. Surface roughness is frequently cited as the reason for disparity between experimental observations and theoretical treatment but seldom verified by direct evidence. This work reports the effect of nanoscale surface roughness on colloidal force measurements carried out in the presence of surfactants. We applied a heating method to reduce the mean surface roughness of commercial latex particles from 30 to 1 nm. We conducted force measurements using the two types of particles at various salt and surfactant concentrations. The surfactants used were pentaethylene glycol monododecyl ether, Pluronic F108, and a styrene/acrylic copolymer, Joncryl 60. In the absence of the surfactant, nanometer...Continue Reading

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Citations

Mar 24, 2016·Environmental Science & Technology·Chao JinMonica B Emelko
Mar 30, 2017·Chemical Communications : Chem Comm·M Gerth, I K Voets
Jan 11, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Shanshan GuoKoon Gee Neoh
May 29, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·J J HamonBrian P Grady
Apr 11, 2019·Analytical Chemistry·Peter KnittelChristoph E Nebel

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