Influence of particle size and concentration on the second-harmonic signal generated at colloidal surfaces |
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Authors: | L Schneider HJ Schmid W Peukert |
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Institution: | (1) Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nuremberg, Cauer Str. 4, 91058 Erlangen, Germany |
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Abstract: | Second harmonic generation (SHG) spectroscopy is a recently developed technique for the investigation of surface properties
of particles. To apply the method to technical colloidal systems, the dependences of several experimental parameters on the
signal have to be studied. In this work the influence of particle concentration on the SHG signal from the surfaces of colloids
(polystyrene beads in a size range of 0.1 μm to 2.9 μm) is investigated. A simple model, based on Lambert–Beer’s law, to describe
the measured dependences is derived. The model agrees with the experimental observations for particles smaller 1.1 μm and
with a small modification also for larger particles. Based on the new model an analytical equation for determining the optimum
concentration, where highest signals in colloidal SHG spectroscopy measurements are obtained, is derived.
PACS 42.25.Fx; 42.65.-k; 82.70.Dd |
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Keywords: | |
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