• Abhay S. Pandey
• Dharmendra P. Singh

Liquid crystals (LCs) have been extensively investigated because they possess properties favorable to many technical applications related to electro-optical (E-O) displays, optical storage devices and non-linear optics [1-3]. Various applications need optimization of physical properties (for example dielectric anisotropic, operating temperature range and stability of the mesophases etc.) by preparing appropriate mixture because none of the LC material discovered till date has all the desired parameters from application point of view. The mixing of liquid crystals allows an adjustment of physical properties and occasionally can lead to induction, expression or suppression of meso phases. Many interactions, which are accountable for the formation of various liquid crystalline phases like Vander Walls forces, hydrogen bonds and electron donor-acceptor interaction in binary mixtures of rod-like LCs have been, reported [4]. Each of these forces, collectively or separately, may be responsible for an increase or decrease of the stability of various liquid crystalline phases or for creating new phases in the mixed systems. Usually such mixtures can be premeditated to have a large thermally stable liquid crystalline (usually nematic or smectic) range, together with optimized values for key material properties. Study of mixtures is important from the point of view of molecular interactions as well. For example a mixture of two cholesteric compounds with opposite optical activities give rise to materials of controllable and temperature sensitive pitch [5]. At a particular composition of cholesteric compounds with opposite optical activities exactly compensated nematic mixture is produced [6]. Mixtures of two non mesogenic compounds may give mesogenic compound [7], mixtures of nematogens may give smectics [8] and mixtures of smectogens may give nematics [9]. Mixtures of smectic C (SmC) and cholesteric (N*) phases may give chiral smectic C (SmC*) phase [10].The phenomenon of re-entrant nematic phases i.e. the reappearance of another nematic (N) phase after a smectic A phase (SmA) by lowering the temperature in rod-like LCs is common in mixtures [11, 12]. Wide varieties of frustrated smectic phases i.e. twist grain boundary (TGB) phases are also observed in mixtures [13-18]. Mixtures of a nematic (N) and a cholesteric (N*) phase adopts the cholesteric texture [19-20]. These mixtures often show blue phases and that too with increased temperature range [21-22]. Nematics and cholesterics are not thermodynamically distinct and therefore they are supposed to be infinitely miscible [23]. The binary system of cholesterics and nematics are characterized by the induction of extra helical twisting which is presumably due to peculiar features of interaction between molecules of different components [24]. Consequently binary system of Cholesteryl Pelargonate (cholesteric) and Nonyloxybenzoic Acid (nematic) gives rise to SmA* (now known as TGBA) phase [25-27]. Liquid crystals possessing nematic and/or smectic phases are most commonly used in production of LCDs due to their unique physical properties and wide temperature range. By applying an electric or magnetic field the orientation of the molecules can be driven in a predictable manner. This mechanism provides the basis for LCDs.

BICOMPONENT MIXTURES OF CHOLESTERYL MYRISTATE AND 4-n-DECYLOXY BENZOIC ACID: FUTURE PROSPECTS AND POSSIBLE USE IN ELECTRONIC DEVICES

"BICOMPONENT MIXTURES OF CHOLESTERYL MYRISTATE AND 4-n-DECYLOXY BENZOIC ACID: FUTURE PROSPECTS AND POSSIBLE USE IN ELECTRONIC DEVICES", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 9, page no.779-785, September-2017, Available :http://www.jetir.org/papers/JETIR1709116.pdf

"BICOMPONENT MIXTURES OF CHOLESTERYL MYRISTATE AND 4-n-DECYLOXY BENZOIC ACID: FUTURE PROSPECTS AND POSSIBLE USE IN ELECTRONIC DEVICES", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 9, page no. pp779-785, September-2017, Available at : http://www.jetir.org/papers/JETIR1709116.pdf