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In Depth Insights into the Key Steps of Delamination of Charged 2D Nano Materials

Rosenfeldt, S and Stoter, M and Schlenk, M and Martin, T and Queiroz De Albuquerque, R and Foster, S and Breu, J (2016) In Depth Insights into the Key Steps of Delamination of Charged 2D Nano Materials. Langmuir: the ACS journal of surfaces and colloids, 32 (41). pp. 10582-10588. ISSN 1520-5827

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Abstract

Delamination is a key step to obtain individual layers from inorganic layered materials needed for fundamental studies and applications. For layered van-der-Waals materials like graphene the adhesion forces are small allowing for mechanical exfoliation, whereas for ionic layered materials like layered silicates the energy to separate adjacent layers is considerably higher. Quite counter intuitively, we show for a synthetic layered silicate (Na0.5-hectorite) that a scalable and quantitative delamination by simple hydration is possible for high and homogeneous charge density, even for aspect ratios as large as 20000. A general requirement is the separation of adjacent layers by solvation to a distance where layer interactions become repulsive (Gouy-Chapman length). Further hydration up to 34 nm leads to the formation of a highly ordered lamellar liquid crystalline phase (Wigner crystal). Up to 8 higher-order reflections indicate excellent positional order of individual layers. The Wigner crystal melts when the interlayer separation reaches the Debye length, where electrostatic interactions between adjacent layers are screened. The layers become weakly chargecorrelated. This is indicated by fulfilling the classical Hansen-Verlet and Lindeman criteria for melting. We provide insight into the requirements for layer separation and controlling the layer distances for a broad range of materials and outline an important pathway for the integration of layers into devices for advanced applications.

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: Q Science > QD Chemistry
Divisions: Pharmacy & Biomolecular Sciences
Publisher: American Chemical Society
Date Deposited: 28 Sep 2016 08:56
Last Modified: 20 Sep 2017 00:50
DOI or Identification number: 10.1021/acs.langmuir.6b02206
URI: http://researchonline.ljmu.ac.uk/id/eprint/4206

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