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Tunable Exfoliation of Synthetic Clays

Title data

Stöter, Matthias ; Rosenfeldt, Sabine ; Breu, Josef:
Tunable Exfoliation of Synthetic Clays.
In: Annual Review of Materials Research. Vol. 45 (July 2015) . - pp. 129-151.
ISSN 1545-4118
DOI: https://doi.org/10.1146/annurev-matsci-070214-020830

Official URL: Volltext

Abstract in another language

The large hydration enthalpy of inorganic interlayer cations sandwiched between moderately negatively charged silicate layers endows to smectites (e.g., hectorite) remarkably rich intracrystalline reactivity compared with most other layered materials. Moreover, they are transparent and inert inmost potential suspension media. Upon suspension in water, smectites readily swell. For homogeneous, melt-synthesized smectites, the degree of swelling can be tuned by choice of interlayer cation and charge density of the layer. Because swelling renders the clay stacks more shear labile, the efficiency of exfoliation by applying shearing forces can in turn be adjusted. Certain smectites even spontaneously delaminate into clay platelets of uniform thickness of 1 nm by progressive osmotic swelling. Osmotic swelling can also be applied to produce well-defined double stacks when one starts with ordered, interstratified heterostructures. Nanocomposites made with high-aspect-ratio fillers obtained this way show superior mechanical, flame retardancy, and permeability properties.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Exfoliation; Delamination; Ordered interstratification; Gas barrier; Mechanical reinforcement; Flame retardancy
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 29 Mar 2018 09:25
Last Modified: 29 Mar 2018 09:25
URI: https://eref.uni-bayreuth.de/id/eprint/43161