Preparation and characterization of MgO nanoparticles/ferroelectric liquid crystal composites for faster display devices with improved contrast | Zendy

Achu Chandran | Zendy; Jai Prakash | Zendy; Kush Kumar Naik | Zendy; Avanish Kumar Srivastava | Zendy; R. Dąbrowski | Zendy; Michał Czerwiński | Zendy; A. M. Biradar | Zendy

Open Access

Preparation and characterization of MgO nanoparticles/ferroelectric liquid crystal composites for faster display devices with improved contrast

Author(s) -

Achu Chandran,

Jai Prakash,

Kush Kumar Naik,

Avanish Kumar Srivastava,

R. Dąbrowski,

Michał Czerwiński,

A. M. Biradar

Publication year - 2013

Publication title -

journal of materials chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.899

H-Index - 128

eISSN - 2050-7534

pISSN - 2050-7526

DOI - 10.1039/c3tc32017k

Subject(s) - materials science , rotational viscosity , ferroelectricity , liquid crystal , nanoparticle , composite number , viscosity , tilt (camera) , characterization (materials science) , composite material , chemical engineering , magnesium , nanotechnology , dielectric , optoelectronics , mechanical engineering , engineering , metallurgy

In this article, we present the formulation and characterization of a ferroelectric liquid crystal (FLC) mixture W301 composed of pyrimidine compounds. We observed that upon doping magnesium oxide nanoparticles (MgO NPs) into the host FLC, the MgO NPs/FLC composite showed significantly faster response and improved optical tilt angle. The decreased response time in the MgO NPs/FLC composite has been attributed to the decrease in rotational viscosity and increase in surface anchoring energy. The decrease in rotational viscosity of the composite is due to the torque experienced by both MgO NPs and FLC in the presence of an electric field and perturbations of order parameters of FLC. Due to the enhanced surface interaction of MgO NPs having surface defects with mesogens, strong surface anchoring is experienced on the FLC molecules that not only increased the speed of the response but also improved the optical tilt angle of the MgO NPs/FLC composites, which ultimately resulted in improved contrast. A systematic approach has been followed to elucidate the idea of designing faster display devices with improved contrast based on MgO NPs/FLC composites.

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