In situ measurements of ion-exchange processes in single polymer particles: Laser trapping microspectroscopy and confocal fluorescence microspectroscopy

Haeng Boo Kim, Masahiko Hayashi, Kiyoharu Nakatani, Noboru Kitamura*, Keiji Sasaki, Jun Ichi Hotta, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

Ion-exchange processes of a cationic dye (Rhodamine B; RhB) were studied for individual polymer particles (diameter of 16-20 μm) by laser trapping microspectroscopy and confocal fluorescence laser microspectroscopy. the absorbance of RhB at 565 nm adsorbed on a cation-exchange particle increased linearly with the concentration of RhB in the aqueous phase, while it was independent of the particle diameter. Fluorescence intensity profile measurements of RhB along the particle diameter by confocal fluorescence microspectroscopy directly proved that ion exchange took place in the surface layer (∼2-μm thickness) of the particle in the initial stage (1 h). Diffusion of RhB in the particle was very slow, and ion exchange proceeded gradually to the inner volume in the order of days. The ion-exchange processes were analyzed on the basis of simulation of the time course of the concentration profile of RhB in the particle, and the diffusion coefficient of RhB was determined to be (2-4) × 10-11cm2·s-1.

Original languageEnglish
Pages (from-to)409-414
Number of pages6
JournalAnalytical Chemistry
Volume68
Issue number3
DOIs
StatePublished - 1 Jan 1996

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