Generation of periodic microrelief in tensioned polymeric substrates with hard coating and their physical properties

Belyaev, V. V.; Misnik, Victor; Trofimov, Sergei; Volynsky, Alexander; Konovalov, V. A.; Muravskii, A. A.

doi:10.1063/1.1845595

Cited by 3 publications

(2 citation statements)

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“…9,10 Several groups have isolated the contributions that surface topography can make to azimuthal anchoring energies by studying LCs in contact with substrates having feature sizes that can be systematically controlled (e.g. surface gratings 11,12 or periodic microrelief structures prepared by the deformation of hard coatings supported on soft polymeric substrates 13 ). Distortion of the director of the LC over the topography of the surface can create an "elastic contribution" to the anchoring energy.…”

Section: Introductionmentioning

confidence: 99%

“…A number of past studies have reported measurements of the azimuthal anchoring energy of mechanically sheared, polymeric surfaces. − It is now understood that mechanical shearing of polymeric surfaces simultaneously introduces two elements of surface structure that can influence the anchoring energy of a LC: (1) micro- and nanogrooves (topography) and (2) preferred alignments of the polymer chains in the near-surface region of the substrate. , Several groups have isolated the contributions that surface topography can make to azimuthal anchoring energies by studying LCs in contact with substrates having feature sizes that can be systematically controlled (e.g. surface gratings , or periodic microrelief structures prepared by the deformation of hard coatings supported on soft polymeric substrates). Distortion of the director of the LC over the topography of the surface can create an “elastic contribution” to the anchoring energy .…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the Azimuthal Anchoring Energy of Liquid Crystals in Contact with Oligo(ethylene glycol)-Terminated Self-Assembled Monolayers Supported on Obliquely Deposited Gold Films

et al. 2006

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We report measurements of the orientations and azimuthal anchoring energies of the nematic liquid crystal 4-cyano-4'-pentylbiphenyl (5CB) on polycrystalline gold films that are deposited from a vapor at an oblique angle of incidence and subsequently decorated with organized monolayers of oligomers of ethylene glycol. Whereas the gold films covered with monolayers presenting tetra(ethylene glycol) (EG4) lead to orientations of 5CB that are perpendicular to the plane of incidence of the gold, monolayers presenting tri(ethylene glycol) (EG3) direct 5CB to orient parallel to the plane of incidence of the gold during deposition of the gold film. We also measure the azimuthal anchoring energy of the 5CB to be smaller on the surfaces presenting EG3 (3.2 +/- 0.8 microJ/m2) as compared to EG4 (5.5 +/- 0.9 microJ/m2). These measurements, when combined with other results presented in this paper, are consistent with a physical model in which the orientation and anchoring energies of LCs on these surfaces are influenced by both (i) short-range interactions of 5CB with organized oligomers of ethylene glycol at these surfaces and (ii) long-range interactions of 5CB with the nanometer-scale topography of the obliquely deposited films. For surfaces presenting EG3, these short- and long-range interactions oppose each other, leading to small net values of anchoring energies that we predict are dependent on the level of order in the EG3 SAM. These measurements provide insights into the balance of interactions that control the orientational response of LCs to biological species (proteins, viruses, cells) on these surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of the Azimuthal Anchoring Energy of Liquid Crystals in Contact with Oligo(ethylene glycol)-Terminated Self-Assembled Monolayers Supported on Obliquely Deposited Gold Films

et al. 2006

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Liquid crystal aligning using different approaches

Каманина

Jovanović

Belyaev

2020

J. Phys.: Conf. Ser.

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In the current paper the classical and new relief at the interface: solid substrate-liquid crystal mesophase is presented in order to orient the liquid crystal molecules with good advantage. Rubbing technique, some geometric construction at the interface, UV and VIS treatment of the polymers, and laser oriented method are shown. The last one is connected with the materials surface relief modification using the laser-matter interaction process by the application of the IR CO2–laser at the wavelength of 10.6 micrometers. As the efficient nano-objects applied for the relief improvement the carbon nanotubes with the small refractive index close to 1.1 and the large Young’s modulus are used. As an additional, the varied electric field of 100-600 V/cm is applied in order to deposit the carbon nanotubes at the materials surfaces in the vertical position and to form the covalent bonding between the carbon atoms and the model matrix materials surface atoms. The novel results are shown in comparison with that obtained before for the classical orienting liquid crystal molecules methods. It extends dramatically the area of the liquid crystal cells use.

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Terahertz radiation and second-harmonic generation from InAs: Bulk versus surface electric-field-induced contributions

2005

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Polarized second-harmonic generation and terahertz radiation in reflection from ͑100͒, ͑110͒, and ͑111͒ faces of n-type InAs crystals are investigated as a function of the sample azimuthal orientation under excitation from femtosecond Ti:sapphire laser pulses. The expressions describing the second-order response ͑optical secondharmonic generation and optical rectification͒ in reflection from zinc-blende crystals, such as InAs, are calculated taking into account the bulk electric-dipole contribution and the first-order surface electric-field-induced contribution. It is shown that the two contributions can be separated based on rotation symmetry considerations. Moreover, a direct comparison of the second-harmonic generation and terahertz radiation emission indicates that the observed dominant surface electric-field-induced optical rectification component may be attributed to the large free-carrier contribution to the third-order susceptibility in InAs.

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Generation of periodic microrelief in tensioned polymeric substrates with hard coating and their physical properties

Cited by 3 publications

References 9 publications

Measurement of the Azimuthal Anchoring Energy of Liquid Crystals in Contact with Oligo(ethylene glycol)-Terminated Self-Assembled Monolayers Supported on Obliquely Deposited Gold Films

Measurement of the Azimuthal Anchoring Energy of Liquid Crystals in Contact with Oligo(ethylene glycol)-Terminated Self-Assembled Monolayers Supported on Obliquely Deposited Gold Films

Liquid crystal aligning using different approaches

Terahertz radiation and second-harmonic generation from InAs: Bulk versus surface electric-field-induced contributions

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