Optical deposition of nanoparticles in dense nanosuspensions
I.N. Egorshin1, V.I. Ivanov2
1 Pacific State University
2 Far Eastern State Transport University
DOI: 10.26456/pcascnn/2025.17.052
Short communication
Abstract: Studying concentration profiles induced by sedimentation is an effective way to obtain an equation of state of a colloidal suspension, to study fine details of the phase diagram and obtain information about the nature of metastable phases. Optical sedimentation methods have a number of advantages over the gravity method or centrifugation. In particular, an effective method of sedimentation in transparent nanosuspensions provides the use of the light pressure. In the case of nanoparticles, the light pressure force can exceed gravitational ones by orders of magnitude even when using continuous radiation sources. Calculation of the concentration profile for sufficiently high radiation intensities, when the volume fraction of nanoparticles at the bottom of the cuvette can reach unity, requires taking into account the interaction (repulsion) of nanoparticles. In this paper, the simplest model for taking into account the finite volume of the nanophase, the hard sphere model, is considered. As a result of the analytical solution of the problem of light-induced mass transfer, an expression is obtained that allows calculating the steady-state concentration profile. The proposed model demonstrates the need to take into account the finite volume of nanoparticles when calculating the parameters of optical deposition in dense nanosuspensions at high (superthermal) radiation
intensities. The results obtained are of interest for the development of new methods for obtaining nanomaterials, photonic crystals and chemical sensors, as well as for improving the methods of optical
diagnostics of nanomaterials.
Keywords: nanoparticle sedimentation, light pressure, nanosuspensions, sedimentation profile, hard sphere model, photonic crystals, optical diagnostics
- Ivan N. Egorshin – Senior Lecturer, Higher School of Physical and Mathematical Sciences, Pacific State University
- Valery I. Ivanov – Dr. Sc., Professor, Department of Physics and Theoretical Mechanics, Far Eastern State Transport University
For citation:
Egorshin I.N., Ivanov V.I. Opticheskoe osazhdenie nanochastits v plotnykh nanosuspenziyakh [Optical deposition of nanoparticles in dense nanosuspensions], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 052-058. DOI: 10.26456/pcascnn/2025.17.052. ⎘
Full article (in Russian): download PDF file
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