Stable smectic phase in suspensions of polydisperse colloidal platelets with identical thickness

Details Stable smectic phase in suspensions of polydisperse colloidal platelets with identical thickness Stable smectic phase in suspensions of polydisperse colloidal platelets with identical thickness

2009-09-14

arxiv.org/abs/0909.2625v1

Phys. Rev. E 80, 041704 (2009)

Physics

Condensed Matter

Soft Condensed Matter

6 pages,7 figures. To appear in Phys. Rev. E

Scientific paper

We report the nematic and smectic ordering in a new aqueous suspension of monolayer $\alpha$-Zirconium phosphate platelets possessing a high polydispersity in diameter but uniform thickness. We observe an isotropic--nematic transition as the platelet volume fraction increases, followed by the formation of a smectic, an elusive phase that has been rarely seen in discotic liquid crystals. The smectic phase is characterized by X-ray diffraction, high-resolution transmission electron microscopy, and optical microscopy. The phase equilibria in this highly polydisperse suspension is rationalized in terms of a theoretical approach based on density--functional theory.

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