Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Inorganic materials display massive and instantaneous swelling and shrinkage

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 mm×35 mm and a thickness of ~2-3 mm. 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 mm in DMAE/H+ = 0.5. At high concentrations, the swelling is somewhat suppressed, with swollen length of ~100 mm at DMAE/H+ = 10.
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 mm×35 mm and a thickness of ~2-3 mm. 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 mm in DMAE/H+ = 0.5. At high concentrations, the swelling is somewhat suppressed, with swollen length of ~100 mm at DMAE/H+ = 10.

Abstract:
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.

Inorganic materials display massive and instantaneous swelling and shrinkage

Tsukuba, Japan | Posted on March 29th, 2013

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.

References

Unusually stable ~100-fold reversible and instantaneous swelling of inorganic layered materials Fengxia Geng1, Renzhi Ma1, Akira Nakamura1, Kosho Akatsuka1, Yasuo Ebina1, Yusuke Yamauchi1, Nobuyoshi Miyamoto2, Yoshitaka Tateyama1 & Takayoshi Sasaki1, 2013 Nature Comm . doi:10.1038/ncomms2641

Affiliations

International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Department of Life, Environment and Materials Science, Fukuoka Institute of Technology, Wajiro-Higashi, Higashi-ku, Fukuoka 811-0295, Japan

####

For more information, please click here

Contacts:
International Center for Materials Nanoarchitectonics(WPI-MANA)

1-1 Namiki, Tsukuba-shi, Ibaraki, 305-0044 Japan

Email: SASAKI.Takayoshinims.go.jp

Telephone: +81-29-860-4313

Copyright © MANA, the International Center for Materials Nanoarchitecton

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Chemistry

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranian, Malaysian Scientists Study Nanophotocatalysts for Water Purification October 23rd, 2014

Could I squeeze by you? Ames Laboratory scientists model molecular movement within narrow channels of mesoporous nanoparticles October 21st, 2014

Physics

Sussex physicists find simple solution for quantum technology challenge October 28th, 2014

New evidence for an exotic, predicted superconducting state October 27th, 2014

Discoveries

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Announcements

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE