Browsing School of Engineering by Author "Vij, Jagdish"
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The Beauty of Twist-Bend Nematic Phase: Fast Switching Domains, First Order Fréedericksz Transition and a Hierarchy of Structures
Vij, Jagdish (2021)The twist-bend nematic phase (NTB) exhibits a complicated hierarchy of structures responsible for several intriguing properties presented here. These are: the observation of a fast electrooptic response, the exhibition of ... -
Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals
Vij, Jagdish; Panarin, Yuri (2013)The fundamental parameter of the uniaxial liquid crystalline state that governs nearly all of its physical properties is the primary orientational order parameter (S) for the long axes of molecules with respect to the ... -
Effect of electric field on the polarised infrared spectra of smectic liquid crystals
Jamshidi, Mohammad Mehdi (Trinity College (Dublin, Ireland). Department of Electronic & Electrical Engineering, 2000)In this research Fourier Transform Infrared Spectroscopy has been used to investigate the effect of the polarised infrared beam and the electric field on the orientational behaviour of the ferroelectric and antiferroelectric ... -
Electrooptic, pyroelectric, dielectric spectroscopic studies of nematic and twist-bend nematic phases of achiral hockey-shaped bent-core liquid crystal
Vij, Jagdish; Panarin, Yuri; Yadav, Neelam (2022)Experimental and theoretical investigations of the twist-bend nematic (NTB) phase in liquid crystals have recently received significant attention for reasons of unusual and interesting characteristics of the NTB. Though ... -
Experimental investigations on biaxial nematic and orthogonal biaxial smectic liquid crystals
Nagaraj, Mamatha (Trinity College (Dublin, Ireland). Department of Electronic & Electrical Engineering, 2011)The quest for thermotropic biaxial nematic phase began forty years ago, when it was recognised that the molecules forming liquid crystal phases deviate from their presumed cylindrical shape. In recent years, the interest ... -
Flexo-elastic and electro-optical studies of some novel liquid crystalline systems
Balachandran, Reshma (Trinity College (Dublin, Ireland). Department of Electronic & Electrical Engineering, 2014)This thesis presents the experimental investigation of the material properties of liquid crystalline systems composed of (i) bent-core molecules, (ii) bimesogens composed of rod-like molecules and (iii) dimesogens composed ... -
Flexoelectric polarization studies in bent-core nematic liquid crystals
Vij, Jagdish; Panarin, Yuri (2015)The flexoelectric polarization ( P f ) of four bent-core nematic liquid crystals (LCs) has been measured using the pyroelectric effect. Hybrid aligned nematic cells are fabricated for measuring the pyroelectric response ... -
Formation and development of nanometer-sized cybotactic clusters in bent-core nematic liquid crystalline compounds
Vij, Jagdish; Panarin, Yuri (2018)Two homologue achiral bent-core liquid crystals (LCs), BCN66 and BCN84, in their nematic phases are studied by dielectric spectroscopy in the frequency range 10 Hz–10 MHz. In each of these compounds, two relaxation processes ... -
Large electroclinic effect and stability of chiral smectic liquid crystals
Manna, Uttam (Trinity College (Dublin, Ireland). Department of Electronic & Electrical Engineering, 2009)Large electroclinic effect in the smectic-A* phase and stability of smectic-C* variant phases are investigated in detail. Investigation of large electroclinic effect in the smectic-A* phase is one of the recent topics, and ... -
Liquid crystal display modes in a nontilted bent-core biaxial smectic liquid crystal
Vij, Jagdish; Panarin, Yuri (2010)Liquid crystal display (LCD) modes associated with the rotation of the secondary director in nontilted, biaxial smectic phase of an achiral bent-core compound are demonstrated. For LCDs, we find that at least four display ... -
observation of an anomalous SmA-SmC-SmA phase sequence in a bent-core liquid crystal derived from 4-cyanoresorcinol
Vij, Jagdish (2020)The physical properties and the phase transitions of a smectic liquid crystal material built from achiral bent-core molecules are investigated by electro-optics, polarizing microscopy, birefringence, and spontaneous ... -
Relationship between the molecular interaction and the structure of the bent core liquid crystals in the nematic phase
Jang, Yun (Trinity College (Dublin, Ireland). Department of Electronic & Electrical Engineering, 2012)The relationship between the molecular interaction and the molecular structure of the bent core mesogens in the nematic phase is investigated in detail. Various physical phenomena are observed and interpreted. -
Sequence of Four Orthogonal Smectic Phases in an Achiral Bent-Core Liquid Crystal: Evidence for the SmAP(alpha) Phase
Vij, Jagdish; Panarin, Yuri (2011)The mesomorphic properties of an achiral bent-core liquid crystal derived from 4-cyanoresorcinol are studied by polarizing optical microscopy, x-ray diffraction, and second harmonic electro-optic response. It shows a novel ... -
Spontaneous helix formation in non-chiral bent-core liquid crystals with fast linear electro-optic effect
Vij, Jagdish; Panov, Vitaly; Panarin, Yuri (2016)Liquid crystals (LCs) represent one of the foundations of modern communication and photonic technologies. Present display technologies are based mainly on nematic LCs, which suffer from limited response time for use in ... -
Spontaneous Mirror Symmetry breaking and chiral segregation in the achiral ferronematic compound DIO
Vij, Jagdish (2023)An achiral compound, DIO, known to exhibit three nematic phases namely N, NX and NF, is studied by polarizing microscopy and electro-optics for different surface conditions in confinement. The high temperature N phase ... -
Various liquid crystalline phases structural analysis using resonant x-ray scattering
Vij, Jagdish (2022)Chiral smectic liquid crystals have a paraelectric phase, a ferroelectric phase, and an antiferroelectric phase. Therefore, multiple phases called secondary phases appear, and sequential phase transitions are observed. ...