The TV in Your Pocket: Development of Liquid‐Crystal Materials for the New Millennium

Abstract

New liquid crystals with very low viscosity, good mesophase behavior, and high reliability are necessary to achieve the breakthrough from flat computer monitors to large displays for television. Fluorine plays a decisive role not only because of the polarity it induces in organic molecules but also because of its low polarizability and weak propensity for ion solvation. In addition, subtle stereoelectronic effects in fluorine-containing liquid crystals influence material properties and allow these to be tuned to some extent to achieve the desired outcome. Some fairly sophisticated chemistry is required that is normally ruled out in the specialty chemicals industry because of cost. The television display market is now entering a phase of saturation. The broad availability of the internet has led to an ever increasing tendency for mobile products. Tablet PCs and smartphones require touch-panel functionality and low power consumption. New LCD modes with high-performance liquid crystals and additional components, such as polymerizable materials, can be used in such products.

Triphilic Ionic‐Liquid Mixtures: Fluorinated and Non‐fluorinated Aprotic Ionic‐Liquid Mixtures

“…[31,32] Furthermore, material design by fluorinationi s ah ot topic in liquid-crystal research, [33] for which it is applied in liquid crystal displays. [34,35] Next to these interesting chemical applications, modification of the macroscopic properties is achieved by (per)fluorination, such as by increasing the density and viscosity in the case of hydrocarbons, [25] whereas the vapor pressure increases and boilingp oints are lowered despite the higherm olecular weight. (Per)fluorination results in low surfacet ension and ah igh capacity for dissolving gases.…”

Preparation and properties of lateral monofluoro-substituted benzoxazole-based mesogenic compounds

“…[8][9][10] Since fluorine is a relatively small atom with a large electronegativity, fluorine atom has been widely introduced into the mesogenic core structure to alter the molecular polarity, and furthermore, to modify mesophase morphology and the physical properties of liquid crystalline materials. [11][12][13] Recently, we prepared a series of two lateral fluorine-substituted mesogenic benzoxazole compounds, [14] 2-(3ʹ,5ʹ-difluoro-4ʹ-alkoxy-1,1ʹ-biphenyl-4-yl)-benzoxazole derivatives (compounds I in Figure 1), whereas the compounds display a narrow mesophase range, which is attributed to the enhanced molecular width resulting from the two lateral fluorines located at both sides of the molecule and to the reduced molecular polarity caused by anti-parallel dipole ordering of two lateral fluorines compared with the benzoxazole group. It is known that dipole-dipole interaction among molecules is one of the key factors for the formation of the mesophase, and the interaction can be enhanced via increasing the molecular polarity.…”

Synthesis and self-assembly behavior of 2,5-diphenylethynyl thiophene based bolaamphiphiles

“…Liquid crystals (LCs), [3] representing soft self-assembly materials, are of significant technological importance [3,4] and provide new routes to increase complexity in soft self-assembly systems [5]. Bent-core LCs composed of a non-linear rigid core with terminal alkyl chains have also attracted significant interest, owing to their ability to exhibit ferroelectric and antiferroelectric properties [6].…”