Colloids and Surfaces A 538 (2018) 320–326 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Refractive index matching of large polydisperse silica spheres in aqueous suspensions Gualberto J. Ojeda-Mendoza, Humberto Contreras-Tello, Luis F. Rojas-Ochoa Departamento de Física, CINVESTAV-IPN,Av. Instituto Politécnico Nacional 2508, 07360, CDMX, Mexico GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: Standard synthesis protocols produce silicon dioxide (SiO ) particles with an inhomogeneous material dis- Silica particles tribution, which deﬁnes their optical properties. The inner structure and eﬀective refractive index of the par- Light scattering ticles can be investigated by light scattering and optical contrast variation techniques. The standard analysis Refractive index relies on scattering models for particles smaller than the wavelength of the scattering probe, thus restricting its Core–shell use for a large variety of particle systems of academic and industrial interest. However, to overcome this dif- Mie theory ﬁculty should be possible by using the appropriate scattering model in the analysis. Here, SiO particles of size comparable to the wavelength of the illuminating source are dispersed at low particle number concentration in diﬀerent mixtures of polar solvents to study the optical contrast. The angle-dependent scattered intensity from SiO particles suspended
Geoderma – Elsevier
Published: Feb 15, 2019
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