In situ studies of molecular transfer between microparticles by second-harmonic generation

Elsa C Y Yan, Yan Liu, K. B. Eisenthal

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Abstract

We have demonstrated that second-harmonic generation (SHG) can be used to investigate the in situ transfer of molecules between colloidal microparticles. The transfer kinetics of organic cations, malachite green (MG) initially adsorbed on to spherical polystyrene sulfate (PSS) microparticles, to disk-shaped clay particles in aqueous solution was obtained. The surface population of MG on the PSS particles during the transfer process can be measured in real time. In the present studies, the adsorption free energy and the number of adsorption sites were found from the adsorption isotherm measured by the SHG method (Wang, H.; Yan, E.C.Y.; Liu, Y.; Eisenthal, K.B. J. Phys. Chem. B 1998, 102, 4446). The kinetics of transfer was observed to depend linearly on the particle density of clay. The observed transfer was biexponential with decay times of 17 ± 1 s and 217 ± 4 s for the case of a clay particle density of 3 × 109/cm3. This method was further applied to study the transfer of MG between PSS microparticles. At a PSS density of 4 × 108/cm3, the decay time was 40 s. Because of the coherent nature of the SHG signal, the transfer kinetics can be obtained in situ by the SHG method. A kinetic model is used to describe the transfer process from which the desorption and adsorption rate constants of MG from and onto PSS particles were obtained.

Original languageEnglish (US)
Pages (from-to)8531-8537
Number of pages7
JournalJournal of Physical Chemistry B
Volume105
Issue number36
DOIs
StatePublished - Sep 13 2001
Externally publishedYes

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microparticles
Harmonic generation
Polystyrenes
harmonic generations
sulfates
polystyrene
Clay
Kinetics
Adsorption
clays
adsorption
kinetics
Adsorption isotherms
Free energy
Cations
Rate constants
Desorption
Positive ions
Sulfates
polystyrene sulfate

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

In situ studies of molecular transfer between microparticles by second-harmonic generation. / Yan, Elsa C Y; Liu, Yan; Eisenthal, K. B.

In: Journal of Physical Chemistry B, Vol. 105, No. 36, 13.09.2001, p. 8531-8537.

Research output: Contribution to journalArticle

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