# 2D nanosheet based lyotropic liquid crystals: from synthesis to structure and applications

Jean-Christophe P. Gabriel

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Jean-Christophe P. Gabriel. 2D nanosheet based lyotropic liquid crystals: from synthesis to structure and applications. Graphene and 2DM Singapore Summit 2019, PHASE EVENTS, Nov 2019, Singapore (SG), Singapore. hal-04735190

HAL Id: hal-04735190

https://hal.science/hal-04735190v1

Submitted on 14 Oct 2024

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Distributed under a Creative Commons Attribution 4.0 International License
**Jean-Christophe P. Gabriel**

CEA/IRAMIS - Saclay, France, & NTU/ERI@N, Singapore
jean-christophe.gabriel@cea.fr & jgabriel@ntu.edu.sg.

**2D nanosheet based lyotropic liquid crystals: from synthesis to structure and applications**

In this presentation I will present the very rich zoology that has been brought to light in the field of 2D mineral/inorganic polyelectrolyte colloidal suspensions. Indeed, if one can produce such suspensions with sufficiently high concentration, some ordering can take place leading to lyotropic mesophases. We will give example of such bidimensional systems and results ranging from the demonstration of the nematic structure of smectic clays nanosheet suspensions (Gabriel et al J. Phys. Chem.) to the discovery of the first lamellar phase based on covalent nanosheets in H3Sb3P2O14 (Gabriel et al. Nature et PNAS 2018). Lamellar phases are very significant as they are the basis of life such as we know it, because they enable the essential requirement: liquid compartmentation. This lamellar phase further stricking property is its exceptionnal hyperswelling behavior, so large that it enable light diffraction enabling rare liquid opalescence.

Such a variety of behaviors make of these 2D inorganic polyelectrolyte suspensions some very interesting models for the development of new theoritical approaches but enable also applications, some of which will be described (Desvaux, Ang. Chemie; Camerel, Nanoletters & Adv. Funct. Mater.).