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Acoustic and electroacoustic spectroscopic determination of the critical coagulation concentration for the aggregation of fumed silica

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Abstract

Acoustic and electroacoustic spectroscopy were use to model varying concentrations of NH4Cl in a 25 wt% fumed silica suspension for interpretation and visualization of the critical coagulation concentration (CCC) needed to induce coagulation of the suspension. The acoustic data indicates a range for the CCC that agrees with Derjaguin and Landau, Verwey and Overbeek theory and experimental results found in literature. The electroacoustic data suggest a power law relationship between NH4Cl concentration and changes in the colloidal vibrational current, and predicts that 0.4M is the CCC for NH4Cl in a fumed silica suspension.

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Authors and Affiliations

  1. Department of Chemistry, Howard University, 525 College Street, Washington, DC, 20059, USA

    Steven S. Burnett

  2. Department of Chemical Engineering, Howard University, 2300 Sixth Street, Washington, DC, 20059, USA

    James W. Mitchell

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  1. Steven S. Burnett
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  2. James W. Mitchell
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Correspondence to Steven S. Burnett.

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Burnett, S.S., Mitchell, J.W. Acoustic and electroacoustic spectroscopic determination of the critical coagulation concentration for the aggregation of fumed silica. J Sol-Gel Sci Technol 74, 661–669 (2015). https://doi.org/10.1007/s10971-015-3645-0

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  • DOI: https://doi.org/10.1007/s10971-015-3645-0

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