Nematic twist-bend phase with nanoscale modulation of molecular orientation

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作者
V. Borshch
Y.-K. Kim
J. Xiang
M Gao
A Jákli
V. P. Panov
J. K. Vij
C. T. Imrie
M. G. Tamba
G. H. Mehl
O. D. Lavrentovich
机构
[1] Liquid Crystal Institute and Chemical Physics Interdisciplinary Program,Department of Electronic and Electrical Engineering
[2] Kent State University,Department of Chemistry
[3] Trinity College,Department of Chemistry
[4] University of Dublin,undefined
[5] School of Natural and Computing Sciences,undefined
[6] University of Aberdeen,undefined
[7] University of Hull,undefined
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A state of matter in which molecules show a long-range orientational order and no positional order is called a nematic liquid crystal. The best known and most widely used (for example, in modern displays) is the uniaxial nematic, with the rod-like molecules aligned along a single axis, called the director. When the molecules are chiral, the director twists in space, drawing a right-angle helicoid and remaining perpendicular to the helix axis; the structure is called a chiral nematic. Here using transmission electron and optical microscopy, we experimentally demonstrate a new nematic order, formed by achiral molecules, in which the director follows an oblique helicoid, maintaining a constant oblique angle with the helix axis and experiencing twist and bend. The oblique helicoids have a nanoscale pitch. The new twist-bend nematic represents a structural link between the uniaxial nematic (no tilt) and a chiral nematic (helicoids with right-angle tilt).
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