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Inorganic materials display massive and instantaneous swelling and shrinkage

Date:
March 29, 2013
Source:
International Center for Materials Nanoarchitectonics (MANA)
Summary:
The first observation of massive swelling and shrinkage of inorganic layered materials like a biological cell provides insights into the production of two-dimensional crystals.

Macroscopic volume and microscopy characterization of the samples before and after swelling. The parent H0.8[Ti1.2Fe0.8]O4 H2O microcrystals exhibit platelets with lateral sizes of ~15 micrometerΧ35 micrometer and a thickness of ~2-3 micrometer. The interlayer spacing is 0.89 nm; thus, the platelets are composed of ~3000 regularly stacked layers. With addition of amine solutions, the samples “ballooned” spontaneously, and the macroscopic volume of the swollen crystals changes with various DMAE solutions, which shows the maximum volume increase at DMAE/H+ = 0.5. Optical microscopy characterizations reveal extended lamellar structures. The longest swollen length is ~200-250 micrometer in DMAE/H+ = 0.5. At high concentrations, the swelling is somewhat suppressed, with swollen length of ~100 micrometer at DMAE/H+ = 10.
Credit: MANA

The first observation of massive swelling and shrinkage of inorganic layered materials like a biological cell provides insights into the production of two-dimensional crystals.

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Two-dimensional (2D) crystals have unique properties that may be useful for a range of applications. Consequently there is high interest in the mechanism for producing 2D crystals by exfoliating materials with layered structures. Now researchers in Japan have reported an unusual phenomenon that layered materials undergo drastic swelling without breaking into separate 2D crystal layers. "The findings demonstrate important implications for and chemical insight into the exfoliating process," say the researchers.

Certain ions or solvents can infiltrate materials with layered structures. This 'intercalation' sometimes causes excessive swelling and ultimately exfoliation into separate layers. The process of exfoliation has been studied in a number of materials including graphite, oxides, and hydroxides among others. In all these materials, exfoliation into separate layers occurs after swelling of less than several nanometres, which raises difficulties in analysis of the swelling stage, and hence the exfoliation mechanism as a whole.

Now Takayoshi Sasaki and colleagues at the International Center for Materials Nanoarchitectonics at the National Institute for Materials Science and the Fukuoka Institute of Technology in Japan have realized up to 100-fold swelling of layered protonic oxides, otherwise known as solid acids, without exfoliation, by exposure to an aqueous amine solution. Adding HCl reduced them to their original size. Notably, n the process more than3000 atomic sheets, which comprise of the starting crystal, instantly move apart and reassemble like shuffled poker cards

Unlike previously reported swelling or exfoliation, which swell far less before exfoliation, the swollen structures produced by exposure to the amine solution remained stable even when shaken. The researchers explain the stability using molecular dynamics calculations. "Unlike the random H2O in the previously reported swollen phases that could be easily exfoliated, long-range structuring of the H2O molecules in the highly swollen structure was confirmed using first-principle calculations." The observations also provide important insights into the physics of these systems.


Story Source:

The above story is based on materials provided by International Center for Materials Nanoarchitectonics (MANA). Note: Materials may be edited for content and length.


Journal Reference:

  1. Fengxia Geng, Renzhi Ma, Akira Nakamura, Kosho Akatsuka, Yasuo Ebina, Yusuke Yamauchi, Nobuyoshi Miyamoto, Yoshitaka Tateyama, Takayoshi Sasaki. Unusually stable ~100-fold reversible and instantaneous swelling of inorganic layered materials. Nature Communications, 2013; 4: 1632 DOI: 10.1038/ncomms2641

Cite This Page:

International Center for Materials Nanoarchitectonics (MANA). "Inorganic materials display massive and instantaneous swelling and shrinkage." ScienceDaily. ScienceDaily, 29 March 2013. <www.sciencedaily.com/releases/2013/03/130329124157.htm>.
International Center for Materials Nanoarchitectonics (MANA). (2013, March 29). Inorganic materials display massive and instantaneous swelling and shrinkage. ScienceDaily. Retrieved November 21, 2014 from www.sciencedaily.com/releases/2013/03/130329124157.htm
International Center for Materials Nanoarchitectonics (MANA). "Inorganic materials display massive and instantaneous swelling and shrinkage." ScienceDaily. www.sciencedaily.com/releases/2013/03/130329124157.htm (accessed November 21, 2014).

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