caa a22 4500 605490023 CHVBK 20210128100502.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1134/S1061933X15050051 doi (NATIONALLICENCE)springer-10.1134/S1061933X15050051 Dolinnyi A. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, 119071, Moscow, Russia aut Fast coagulation of gold sols. the formation of interparticle contacts at early stages [Elektronische Daten] [A. Dolinnyi] The fast coagulation of gold sols with concentrations of 46-nm particles equal to (0.8-30) × 1010 cm-3 initiated by an indifferent electrolyte has been studied by spectrophotometry. Variations arising in two absorption bands upon the formation of asymmetric clusters in the sols of plasmonic nanoparticles have been analyzed. Analysis of the kinetic data on variations in the high-energy mode, the intensity of which is governed by the contributions of both individual nanoparticles and their aggregates, has shown that, at early stages, the coagulation has the character of a bimolecular reaction. Extinction spectra of dimers, in which gold nanoparticles are located at different distances from each other, have been calculated with the use of the generalized Mie theory. A "plasmon ruler,” which represents the shift of the longitudinal plasmon resonance band of dimers relative to that of individual particles as depending on the distances between the surfaces of the particles in the dimer, has been constructed based on the calculated data. Using the plasmon ruler and experimental data, the distance between nanoparticles in dimers formed during coagulation has, for the first time, been determined. It has been found that, at the initial stages of gold sol fast coagulation, when the process develops as a bimolecular reaction, nanoparticles that have formed dimers are not in the direct contact. Pleiades Publishing, Ltd., 2015 Colloid Journal Pleiades Publishing 77/5(2015-09-01), 600-607 1061-933X 77:5<600 2015 77 10595 https://doi.org/10.1134/S1061933X15050051 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061933X15050051 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Dolinnyi A. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, 119071, Moscow, Russia aut NATIONALLICENCE 773 0- Colloid Journal Pleiades Publishing 77/5(2015-09-01), 600-607 1061-933X 77:5<600 2015 77 10595