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Application of Raman Spectroscopy to the Study of Adsorption Effects at Liquid-Solid Interfaces

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A sample cell for investigating suspensions or emulsions by Raman spectroscopy in the optically favorable 90° scattering arrangement is described. The Raman spectra of pyridine in a suspension of Aerosil 200 in carbon tetrachloride are recorded. The adsorption isotherm of pyridine is determined from the intensities of the Raman lines at 1008 and 990 cm−1. Over a long range of coverage a linear relationship exists between reciprocal concentrations of chemisorbed and dissolved molecules. The minimal surface area that is occupied by a chemisorbed molecule is determined to be approximately 0.75 nm2.

Keywords: Adsorbed molecules; Langmuir's adsorption isotherm; Raman sample cell; Raman spectroscopy

Document Type: Research Article


Affiliations: Academy of Sciences of GDR, Central Institute of Physical Chemistry, DDR 1199 Berlin, German Democratic Republic

Publication date: July 1, 1982

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