Change of the refractive index of illite particles by reduction of the Fe content of the octahedral sheet
Friedrich, Frank (Institute for Technical Chemistry - Water and Geotechnology. Division of Nanomineralogy)
Steudel, Annette (Institute for Technical Chemistry - Water and Geotechnology. Division of Nanomineralogy)
Weidler, Peter G. (Institute for Technical Chemistry - Water and Geotechnology. Division of Nanomineralogy)

Data:	2008
Resum:	Sub-micrometer clay particles are ofintere st in clay-polymer applications, especially when transparency is important. The scattering oflight can be reduced by the adjustment of the refractive index (RI) oft he clays to that oft he matrix. In this study, the RI of sub-micrometer illite particles was changed by treatment with 5 M HCl for treatment times ranging between 2 and 24 h. The dissolution of Fe leads to a decrease in the RI of illite from 1. 587 for the unaltered material to 1. 502 after 24 h. The layer structure of the illite particles was preserved during the treatment. The RI ofthe sub-micrometer illite particles was determined by means of a photospectrometer measuring the light intensity passing through suspensions containing the clay particles, with varying refractive indices.
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Layer silicates ; Nanocomposites ; Optical properties ; Refractive index ; Small particles
Publicat a:	Clays and Clay Minerals, Vol. 56, Núm. 5 (2008) , p. 505-510, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560503

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