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Reaction of gaseous hydrogen fluoride with the surface of lanthanum chloride solution to form LaF3·nH2O film and microtubes thereof

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Abstract

We present the first study of the reaction of hydrogen fluoride fed from the air side of the air/LaCl3 aqueous solution interface with lanthanum cations. The reaction yields a 0.5–1.5-μm LaF3·nH2O surface film with hexagonal crystal structure, built of the ordered planar LaF3·nH2O nanocrystals (the crystal thickness of 7–15 nm and surface area of 0.5–2.5 μm2). The nanocrystals are oriented perpendicular to the interphase boundary, and their packing gets looser towards the solution side of the film. Upon drying in air, the LaF3·nH2O film rolls up to form microtubes 20–100 μm in diameter and up to 2 mm long. The microtubes are likely formed due to the contraction forces developing upon drying in the lower, loosest part of the wet film.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia

    L. B. Gulina & V. P. Tolstoy

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  1. L. B. Gulina
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  2. V. P. Tolstoy
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Correspondence to L. B. Gulina.

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Original Russian Text © L.B. Gulina, V.P. Tolstoy, 2014, published in Zhurnal Obshchei Khimii, 2014, Vol. 84, No. 8, pp. 1243–1246.

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Gulina, L.B., Tolstoy, V.P. Reaction of gaseous hydrogen fluoride with the surface of lanthanum chloride solution to form LaF3·nH2O film and microtubes thereof. Russ J Gen Chem 84, 1472–1475 (2014). https://doi.org/10.1134/S1070363214080039

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  • DOI: https://doi.org/10.1134/S1070363214080039

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