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• W2161844661 startingPage "51" @default.
• W2161844661 abstract "An experimental study was performed to investigate the potential use of highly charged, spherical nanoparticles to control the forces between spherical microparticles, with the aim of developing novel methods for reversibly controlling the stability of a colloidal dispersion. A specific focus of the project was to determine the degree to which the nanoparticles strongly adsorb to the microparticles, as such adsorption would severely limit reversibly controlling forces and stability. Colloidal probe atomic force microscopy (CP-AFM) was used to measure the force between a silica microparticle and a silica plate in solutions of highly charged polystyrene nanoparticles at varying pH, covering the range over which the silica surfaces were very weakly charged (e.g., pH ≤ 3) to highly charged (e.g., pH 6.0). It was found that except for the highest pH, where the silica zeta potential was approximately −60 mV, addition of relatively low concentrations of the nanoparticles (e.g., 0.1% vol.) led to an increased repulsion between the microparticle and plate. This increased repulsion was evident even at pH 4.0 when the fractional surface coverage of the nanoparticles was only 1%. At low nanoparticle concentrations, this force decayed exponentially with a decay length equal to the bulk Debye length, indicating that it was electrostatic in origin. At higher nanoparticle concentrations (1.0% vol.), long-range depletion forces became significant, causing a deviation from the exponential behavior. This increased repulsion did not disappear upon flushing the nanoparticles out of the system, indicating that the nanoparticles were held in relatively deep energy wells. These results suggest that strong adsorption of nanoparticles should be expected in all but the most highly repulsive systems and also illustrate the challenges associated with using charged nanoparticles as a tool for controlling stability." @default.
• W2161844661 created "2016-06-24" @default.
• W2161844661 creator A5049191466 @default.
• W2161844661 creator A5062687399 @default.
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• W2161844661 date "2012-02-01" @default.
• W2161844661 modified "2023-10-11" @default.
• W2161844661 title "Manipulating microparticle interactions using highly charged nanoparticles" @default.
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• W2161844661 doi "https://doi.org/10.1016/j.colsurfa.2011.12.040" @default.
• W2161844661 hasPublicationYear "2012" @default.
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