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Instruments / Technical Area	Publication Details	Published	Actions
I16-Materials and Magnetism I22-Small angle scattering & Diffraction	Complex multicolor tilings and critical phenomena in tetraphilic liquid crystals Xiangbing Zeng , Robert Kieffer , Benjamin Glettner , Constance Nurnberger , Feng Liu , Karsten Pelz , Marko Prehm , Ute Baumeister , Harald Hahn , Heinrich Lang , Gillian Gehring , Christa Weber , Jamie Hobbs , Carsten Tschierske , Goran Ungar Science 331, 1302-1306 DOI: 10.1126/science.1193052 PMID: 21393540 Show Abstract ▼ Abstract: T-shaped molecules with a rod-like aromatic core and a flexible side chain form liquid crystal honeycombs with aromatic cell walls and a cell interior filled with the side chains. Here, we show how the addition of a second chain, incompatible with the first (X-shaped molecules), can form honeycombs with highly complex tiling patterns, with cells of up to five different compositions ("colors") and polygonal shapes. The complexity is caused by the inability of the side chains to separate cleanly because of geometric frustration. Furthermore, a thermoreversible transition was observed between a multicolor (phase-separated) and a single-color (mixed) honeycomb phase. This is analogous to the Curie transition in simple and frustrated ferro- and antiferromagnets; here spin flips are replaced by 180° reorientations of the molecules.	Mar 2011
I16-Materials and Magnetism	GISAXS in the study of supramolecular and hybrid liquid crystals G. Ungar , F. Liu , X. Zeng , B. Glettner , M. Prehm , R. Kieffer , C. Tschierske Journal of Physics: Conference Series 247 (1) SAS 2009 DOI: 10.1088/1742-6596/247/1/012032 Open Access Show Abstract ▼ Abstract: The use of grazing incidence small and intermediate angle X-ray scattering in the study of structure and alignment of thermotropic liquid crystals is illustrated on selected examples. These include columnar LC phases of a star-shaped mesogen, several honeycomb phases of T-shaped and X-shaped bolaamphiphilic LCs, and gold nanoparticles coated with mesogenic ligands. Sharp Bragg reflections from systems with 2-d and 3-d periodicities are obtained through annealing. Due to nearly perfect surface alignment in most cases, indexing of complex diffraction patterns is facilitated. Honeycomb cells with deformed hexagonal cross-sections, as well as kagome lattice, are shown. The tilt of the reciprocal lattice is shown to help establish the correct structure in the case of the stretched hexagonal honeycombs and the rhombohedral arrays of ordered strings of gold nanoparticles.	Oct 2010

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