Issue 9, 2018

Massive hydration-driven swelling of layered perovskite niobate crystals in aqueous solutions of organo-ammonium bases

Abstract

Osmotic swelling behaviors in layered perovskite niobate were examined in aqueous solutions containing three types of amine-related agents including quaternary ammonium hydroxides and tertiary aminoethanol. Platelet microcrystals of a protonated layered perovskite niobate, HCa2Nb3O10·1.5H2O, were found to show enormous swelling in the aqueous solutions, which was clearly recognized by the noticeable expansion of the sample volume over 100-fold. Optical microscopy observations revealed that the crystals underwent accordion-like elongation in the layer-stacking direction up to several ten-fold the initial thickness. Small-angle X-ray scattering measurements of swollen samples indicate the expansion of interlayer separation ranging from ∼20 nm to over 100 nm, which is primarily governed by the concentrations of the amine-related agents. The magnitudes of the interlayer separation were comparable to those of the macroscopic swelling. The degree of swelling was progressively suppressed with further increasing concentration, and this suppression trend was related to the amines.

Graphical abstract: Massive hydration-driven swelling of layered perovskite niobate crystals in aqueous solutions of organo-ammonium bases

Supplementary files

Article information

Article type
Paper
Submitted
13 9 2017
Accepted
23 10 2017
First published
23 10 2017

Dalton Trans., 2018,47, 3022-3028

Massive hydration-driven swelling of layered perovskite niobate crystals in aqueous solutions of organo-ammonium bases

Y. Song, N. Iyi, T. Hoshide, T. C. Ozawa, Y. Ebina, R. Ma, S. Yamamoto, N. Miyamoto and T. Sasaki, Dalton Trans., 2018, 47, 3022 DOI: 10.1039/C7DT03413J

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