Jump to main content
Jump to site search


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

Author affiliations

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 13 Sep 2017, accepted on 23 Oct 2017 and first published on 23 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT03413J
Citation: Dalton Trans., 2018, Advance Article
  •   Request permissions

    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, Advance Article , DOI: 10.1039/C7DT03413J

Search articles by author

Spotlight

Advertisements