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Fast coagulation of gold sols. Rate constants for dimerization of nanoparticles

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Abstract

By using the generalized Mie theory, the extinction cross sections for dimers of 46-nm gold particles immersed in water have been calculated. It has been found that, in the region of high-energy plasmon resonance band, the maximum value of normalized extinction cross section Qext1 gradually decreases as particles approach each other. The greatest changes in Qext1 are observed when interparticle distance h decreases from 10 to 3 nm. At shorter distances, Qext1 weakly depends on h. At the same time, the band position varies in a complicated manner; however, at h < 2.5 nm, it coincides with that for individual particles. The revealed properties of the high-energy plasmon resonance band for dimers have been used to determine the absolute rate constant for dimerization of 46-nm gold particles k 11. By spectrophotometry, we have investigated salt-induced coagulation of gold sols and have measured the rates of the decrease in optical density. Experimental and calculation data allowed us to establish, at initial stages of fast coagulation, when the distance between the surfaces of 46-nm gold particles is 1.3–2.0 nm (Dolinnyi, A.I., Colloid J., 2015, vol.77, p. 600.), the average value of k 11 is (9.20 ± 1.34) × 10–12 cm3/s for sols with particle concentrations of (0.4–2.6) × 1010 cm–3.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia

    A. I. Dolinnyi

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  1. A. I. Dolinnyi
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Correspondence to A. I. Dolinnyi.

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Original Russian Text © A.I. Dolinnyi, 2016, published in Kolloidnyi Zhurnal, 2016, Vol. 78, No. 1, pp. 49–53.

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Dolinnyi, A.I. Fast coagulation of gold sols. Rate constants for dimerization of nanoparticles. Colloid J 78, 65–69 (2016). https://doi.org/10.1134/S1061933X16010063

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  • DOI: https://doi.org/10.1134/S1061933X16010063

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