Publications

Dipole-dipole interactions and the origin of ferroelectric ordering in polar nematics

Osipov MA

Liquid Crystals Vol 51, pp. 2349-2355 (2024)

https://doi.org/10.1080/02678292.2024.2349667

Theoretical models for the nematic twist-bend phase and the Landau de Gennes theory of Longa and Tomczyk

Osipov M A

Liquid Crystals Vol 51, pp. 948-960 (2024)

https://doi.org/10.1080/02678292.2024.2321464

On the origin of the ferroelectric ordering in nematic liquid crystals and the electrostatic properties of ferroelectric nematic materials

Osipov MA

Liquid Crystals Reviews Vol 12, pp. 14-29 (2024)

https://doi.org/10.1080/21680396.2024.2360391

Effect of rod-like nanoparticles on the dielectric susceptibility of nematic nano-composites : a molecular theory

Osipov Mikhail A, Merekalov Alexey S, Ezhov Alexander A

Crystals Vol 12 (2022)

https://doi.org/10.3390/cryst12121827

Effective chiral interactions between nonchiral rigid macromolecules in a chiral solvent and the induced cholesteric liquid crystal phase

Osipov Mikhail A, Merekalov Alexey S

Crystals Vol 12 (2022)

https://doi.org/10.3390/cryst12091318

Statistical theory of helical twisting in nematic liquid crystals doped with chiral nanoparticles

Osipov Mikhail A, Merekalov Alexey S, Ezhov Alexander A

Crystals Vol 11 (2021)

https://doi.org/10.3390/cryst11111432

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Professional Activities

Newton International Fellowships Panel (External organisation)

Member

2018

Stochastic Spin Systems:models, theory, simulation and real world applications

Invited speaker

28/9/2017

Orientational order of anisotropic nanoparticles in nematic iquid crystals and diblock copolymers

Speaker

26/6/2017

14th European Liquid Crystal Conferenc

Invited speaker

26/6/2017

26th International Liquid Crystal Conference

Invited speaker

30/8/2016

26th International Liquid Crystal Conference

Speaker

2/8/2016

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Projects

Molecular models for unconventional smectic liquid crystals

Osipov, Mikhail (Principal Investigator)

01-Jan-2011 - 31-Jan-2012

Thermodynamics of liquid crystal ordering in polymer nematics doped with najoparticles. Collaboration projedct supported by Russian Sci. Foundation, 3 Mil RUB

Osipov, Mikhail (Principal Investigator)

01-Jan-2011 - 31-Jan-2012

Materials World Network: Fast Analog Electrooptic Liquid Crystal Materials

Osipov, Mikhail (Principal Investigator)

A joint program of research in chiral/polar liquid crystals showing fast analog electrooptics is proposed between experimental and computer simulation group at the University of Colorado, Boulder, experimental groups at Chalmers University of Technology, Sweden, the University of Stuttgart, Germany and Queen's University, Canada, and the theoretical group at the University of Strathclyde, UK. While various combinations of the partners have been collaborating separately over the past several years, all with joint publications, the proposed Network will create a uniquely powerful team for forefront research on chiral liquid crystals. The proposal is focused into synthesis, characterization and theoretical modelling of novel smectic liquid crystal materials, which will have a number of advantages over the existing materials including much faster switching, lower energy consumption and a broader range of applications in electrooptic and all optical devices. A number of exotic chiral smectic liquid crystal materials will be investigated including the V-shaped switching ferroelectric smectics with the most rapid analog liquid crystal electro-optic effects; the deVries materials which tilt without layer contraction in the Smectic C* phase, the closely related orthoconic high-tilt antiferroelectrics; and the recently discovered family of bent-core liquid crystals with a polar smectic A phase that give phase-only electrooptic modulation The de Vries type smectic materials are characterized by anomalously weak layer contraction which enables one to avoid buckling of smectic layers at the tilting transition leading to the formation of the so-called zig-zag defects which seriously degrade the optical quality of smectic materials.. All of these smectic materials will be studied experimentally using polarized microscopy, polarization and tilt angle measurements, x-ray scattering technique and refractometry, and new materials with advanced characteristics will be synthesized using guidance from experiment, molecular theory and atomistic computer simulations. The proposed research highlights fundamental studies of the relationships of the properties of these novel liquid crystal systems with ramifications for a variety of areas in soft materials science. The corresponding materials development will enable a variety of novelapplications, including holographic data storage and projection, beam steering, and chirality detection. The theoretical part of the whole proposal (Work package Strathclyde) is focused into the development of the advance molecular theory of de Vries type ferroelectric materials, taking into account short-range orientational and positional intermolecular correlations, and interpretation of the experimental results obtained by other teams. Using the results of experimental studies and computer simulations, molecular models of analog de Vries smectic materials with nano-segregating groups will be developed, order parameters of these materials will be calculated numerically and compared with experimental data. Effect of various molecular model parameters on the value and temperature variation of the spontaneous polarization in de Vries type materials will be investigated including the effects of molecular shape and flexibility, dipole distribution and nano-segregating groups.

01-Jan-2010 - 30-Jan-2013

Structure and Optical properties of composite materials based on cholesteric and smectic liquid crystals with semiconductor nanoparticles. Collaboration project supported by Russian Sci. Foundation, 3 Mil RUB

Osipov, Mikhail (Principal Investigator)

01-Jan-2010 - 31-Jan-2011

Smectic Ordering in Novel Materials. From Unconventional Liquid Crystals to Anisotropic Ionic Fluids. Joint Research with University of Stuttgart supported by German SDcience Foundation, 45000 Euro

Osipov, Mikhail (Principal Investigator)

30-Jan-2008 - 01-Jan-2009

Smectic liquid crystals that tilt without layer contraction

Osipov, Mikhail (Principal Investigator)

In conventional smectic liquid crystals (LC) the transition into the tilted Sm C phase is accompanied by a decrease of smectic layerspacing. This is a very negative factor for electro-optic displays based on ferro- and antiferroelectric smectic LC because the layer compression leads to a buckling of layers in a chevron geometry. This results in a serious degrade of the quality of such devices. Recently a number of novel smectic materials have been discovered with practically no layer compression. These materials attract a significant interest from industry and academia; they seem to represent a novel type of tilting transition which may also be observed in other soft matter systems including organic monolayers, artificial and biological membranes. A novel molecular theory of SmA - Sm C transition will be developed which explains why some materials do not show a layer contraction, and why others do, and how the molecular structure can affect the nature of the tilting transition. The theory will explain the existing experimental data including the role of low orientational order and weak interlayer correlations. Molecular models for smectics without layer compression will be proposed, based on model interaction potentials, and molecular parameters will be identified which enable one to distinguish between conventional and novel smectic materials.

01-Jan-2005 - 30-Jan-2008

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