Measurement of Azimuthal Anchoring Energy of Nematic Liquid Crystal on Photoaligning Polymer Surface

Andrienko, Denis; Dyadyusha, A.; Iljin, Andrey G.; Kurioz, Yu.; Reznikov, Yuri

doi:10.1080/10587259808025093

Cited by 33 publications

(14 citation statements)

References 11 publications

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“…Anchoring strength is an important factor in a wide range of topics including display device switching 27 , wetting transitions on structured surfaces 8 and in the onset of spontaneous flow in active systems 28 . From an experimental point of view, the anchoring strength of a substrate is difficult to measure, and most methods involve the optical properties of the liquid crystal 29,30 , or its response to applied electric 31,32 or magnetic 33 fields. In this study we show that it is not only the anchoring type but also that the anchoring strength that has an important effect on microfluidic flows of nematics, which consequently has the potential to be used to quantify anchoring.…”

Section: Introductionmentioning

confidence: 99%

The effect of anchoring on the nematic flow in channels

2015

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Understanding the flow of liquid crystals in microfluidic environments plays an important role in many fields, including device design and microbiology. We perform hybrid lattice-Boltzmann simulations of a nematic liquid crystal flowing under an applied pressure gradient in two-dimensional channels with various anchoring boundary conditions at the substrate walls. We investigate the relation between flow rate and pressure gradient and the corresponding profile of the nematic director, and find significant departures from the linear Poiseuille relation. We also identify a morphological transition in the director profile and explain this in terms of an instability in the dynamical equations. We examine the qualitative and quantitative effects of changing the type and strength of the anchoring. Understanding such effects may provide a useful means of quantifying the anchoring of a substrate by measuring its flow properties.

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Section: Introductionmentioning

confidence: 99%

The effect of anchoring on the nematic flow in channels

2015

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“…These two parameters are critical design parameters for every liquid crystal device [3]. A variety of experimental methods have been proposed to measure anchoring parameters, in particular the anchoring coefficient W [4,5]. Most of them measure surface director deviations in an external field and involve rather complicated optical setups.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal director fluctuations and surface anchoring by molecular simulation

2000

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We propose a simple and reliable method to measure the liquid crystal surface anchoring strength by molecular simulation. The method is based on the measurement of the long-range fluctuation modes of the director in confined geometry. As an example, molecular simulations of a liquid crystal in slab geometry between parallel walls with homeotropic anchoring have been carried out using the Monte Carlo technique. By studying different slab thicknesses, we are able to calculate separately the position of the elastic boundary condition, and the extrapolation length.

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“…At the zero electric field, the fabricated TN cell displays a uniform white color throughout the whole area of the cell, which shows that the Mauguin’s condition generally called a normally white mode in the Fig. 5(a) 5657. By increasing the applied voltage, the orientation of 5CB changes from the twisted to the homeotropic states with decreasing transmittance.…”

Section: Resultsmentioning

confidence: 91%

Multifunctional Optical Thin Films Fabricated by the Photopolymerization of Uniaxially Oriented Lyotropic Liquid Crystal Monomers for Electro-Optical Devices

Choi

Yoon

et al. 2016

Sci Rep

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A multifunctional optical thin film (MOTF) is fabricated by coating the newly synthesized perylene-based reactive mesogen (PBRM) and stabilized by the subsequent photopolymerization. Based on the spectroscopic results combined with morphological observations, it is found that nematic liquid crystal (NLC) is aligned parallel to the molecular long axis of PBRM not only due to the long-range physical anchoring effect but also due to the short-range molecular physical interactions between alignment layer and NLC molecules. From the electro-optical properties of LC test cells fabricated with the PBRM MOTF, it is clearly demonstrated that the PBRM MOTF can work as the planar LC alignment layer as well as the in-cell coatable polarizer. The coatable PBRM MOTF from lyotropic chromonic reactive mesogens can pave a new way for the flexible optoelectronic devices.

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Measurement of Azimuthal Anchoring Energy of Nematic Liquid Crystal on Photoaligning Polymer Surface

Cited by 33 publications

References 11 publications

The effect of anchoring on the nematic flow in channels

The effect of anchoring on the nematic flow in channels

Liquid crystal director fluctuations and surface anchoring by molecular simulation

Multifunctional Optical Thin Films Fabricated by the Photopolymerization of Uniaxially Oriented Lyotropic Liquid Crystal Monomers for Electro-Optical Devices

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