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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pol S. V., Pol V. G., Gedanken A., Frydman A., Churilov G. N.
Заглавие : Fabrication and magnetic properties of ni nanospheres encapsulated in a fullerene-like carbon
Место публикации : Journal of Physical Chemistry B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter: American Chemical Society, 2005. - Т. 109, № 19. - P.9495-9498. - ISSN 1520-6106, DOI 10.1021/jp050692j
Примечания : Библиогр.: 27
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Long-Range Orientational Order, Local-Field Anisotropy, and Mean Molecular Polarizability in Liquid Crystals
Разночтения заглавия :авие SCOPUS: Long-range orientational order, local-field anisotropy, and mean molecular polarizability in liquid crystals
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 108, Is. 1. - P176-186. - ISSN 1063-7761, DOI 10.1134/S106377610901021X
Примечания : Cited References: 35
Предметные рубрики: REFRACTIVE-INDEXES
OPTICAL ANISOTROPY
Ключевые слова (''Своб.индексиров.''): anisotropy--crystal symmetry--crystals--electric fields--light sources--liquid crystals--liquids--molecules--tensors--biaxial liquid crystals--calamitic--discotic--discotic liquid crystals--experimental datum--field models--lorentz--mesoscopic--molecular polarizability--orientational orders--phase state--nematic liquid crystals
Аннотация: The problems on the relation of the mean effective molecular polarizability (gamma) over bar to the long-range orientational order of molecules (the optical anisotropy of the medium) in uniaxial and biaxial liquid crystals, the local anisotropy on mesoscopic scales, and the anisotropy of the Lorentz tensor L and the local-field tensor f are formulated and solved. It is demonstrated that the presence of the long-range orientational order of molecules in liquid crystals imposes limitations from below on the molecular polarizability (gamma) over bar, which differs for uniaxial and biaxial liquid crystals. The relation between the local anisotropy and the molecular polarizability (gamma) over bar is investigated for calamitic and discotic uniaxial liquid crystals consisting of lath- and disk-shaped molecules. These liquid crystals with identical macroscopic symmetry differ in the local anisotropy and the relationships between the components L(parallel to) L(perpendicular to,) f(parallel to) f(perpendicular to) (calamitic) and L(parallel to) L(perpendicular to,) f(parallel to) f(perpendicular to) (discotic) for an electric field oriented parallel and perpendicular to the director. The limitations from below and above on the molecular polarizability (gamma) over bar due to the anisotropy of the tensors L and f are established for liquid crystals of both types. These limitations indicate that the molecular polarizability (gamma) over bar depends on the phase state and the temperature. The factors responsible for the nonphysical consequences of the local-field models based on the approximation (gamma) over bar = const are revealed. The theoretical inferences are confirmed by the experimental data for a number of calamitic nematic liquid crystals with different values of birefringence and the discotic liquid crystal Col(ho).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Inverse mode of ion-surfactant method of director reorientation inside nematic droplets
Место публикации : Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P.1998-2003. - ISSN 1542-1406, DOI 10.1080/15421400903050814
Примечания : Cited Reference Count: 8. - Гранты: This work was partially supported by the grants Nos. NSh-3818.2008.3; 02.740.11.0220, and No. 08-03-01007 of RFBR, and Nos. 27.1; 110; 144 of SB RAS. M. Krakhalev acknowledges the financial support from K. I. Zamaraev MBN Foundation. O. Prishchepa acknowledges the financial support from Russian Science Support Foundation.Финансирующая организация: RFBR [NSh-3818.2008.3, 02.740.11.0220, 08-03-01007]; SB RAS [27.1; 110; 144]; Zamaraev MBN Foundation; Russian Science Support Foundation
Ключевые слова (''Своб.индексиров.''): electrically commanded surfaces--ion surfactant--nematic--polymer dispersed liquid crystals--surface anchoring--electrically commanded surfaces--ion surfactant--nematic--polymer dispersed liquid crystals--surface anchoring--applied voltages--crossed polarizers--director fields--director reorientation--droplet structure--electrically commanded surfaces--high concentration--homeotropic--initial state--ionic modification--liquid-crystal droplets--nematic droplets--nematic polymer--surface-active cations--surface-anchoring--trimethyl--ammonium compounds--cationic surfactants--crystals--drop formation--dyes--ionization of liquids--ions--liquid crystal displays--liquid crystals--liquids--nematic liquid crystals
Аннотация: Inverse mode of a novel electrooptical effect caused by the ionic modification of boundary conditions has been studied for liquid crystal droplets. We have considered the droplets of nematic 5CB doped with cationic surfactant cetyl-trimethyl-ammonium-bromide and dispersed in polyvinyl alcohol. In the initial state the surface anchoring was normal on the whole interface due to the high concentration of homeotropic surfactant. Applied voltage results in the purification of a section of the interface from the surface-active cations thereby restoring here a tangential anchoring and stimulating the significant transformation of droplet structure. At that three different types of director field distribution can be realized within the same droplet. The proper textures of the droplet both in the crossed polarizers and without analyzer are considered.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavriliuk A. P., Isaev I. L., Karpov S. V., Krasnov I. V., Shaparev N. Y.
Заглавие : Brownian dynamic of laser cooling and crystallization of electron-ion plasma
Место публикации : Phys. Rev. E. - 2009. - Vol. 80, Is. 5. - Ст.56404. - ISSN 1539-3755, DOI 10.1103/PhysRevE.80.056404
Примечания : Cited References: 29
Предметные рубрики: ULTRACOLD NEUTRAL PLASMAS
OPTICAL MOLASSES
LIQUIDS
ATOMS
TRAP
Ключевые слова (''Своб.индексиров.''): brownian motion--laser cooling--plasma collision processes--plasma light propagation--plasma nonlinear processes--plasma simulation--plasma transport processes--brownian dynamics--brownian dynamics simulations--electron ion plasma--electron subsystem--friction force--ionic structure--nonlinear dependence--plasma cooling--brownian movement--crystallization--ions--laser cooling--lasers--cooling
Аннотация: Laser cooling and crystallization of electron-ion plasma is studied using the Brownian dynamics simulation technique and taking into consideration the interaction of ions with the electron subsystem. It has been shown that the nonlinear dependence of laser friction force on the velocity of ions has to be taken into account in order to simulate in an adequate manner the cooling dynamics and obtain a correct estimate for minimum temperatures. It has been found that times required for formation of an ordered ionic structure can be much longer than the typical plasma cooling time.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Eremin I., Efremov D. V., Maslov D. L., Chubukov A. V.
Заглавие : Nonanalytic Spin Susceptibility of a Fermi Liquid: The Case of Fe-Based Pnictides
Коллективы : RFBR [09-02-00127]; OFN RAS; APCTP; NSF-DMR [0645461, 0604406]; RMHE [2.1.1/3199]; Laboratoire de Physique des Solides, Universite Paris-Sud (France); RTRA Triangle de la Physique
Разночтения заглавия :авие SCOPUS: Nonanalytic spin susceptibility of a fermi liquid: The case of Fe-based pnictides
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2009. - Vol. 102, Is. 23. - Ст.236403. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.102.236403
Примечания : Cited References: 41. - We thank R. Klingeler for useful discussions. M. M. K. acknowledges support from RFBR ( 09-02-00127) and the OFN RAS program on "Strong electronic correlations". I. E. acknowledges partial support from APCTP, NSF-DMR ( 0645461), and the RMHE Program ( Contract No. 2.1.1/3199). D. L. M. acknowledges support from Laboratoire de Physique des Solides, Universite Paris-Sud ( France) and RTRA Triangle de la Physique. A. V. C. acknowledges support from NSF-DMR 0604406.
Предметные рубрики: PHASE-TRANSITIONS
QUANTUM
Ключевые слова (''Своб.индексиров.''): electron pockets--fermi energy--linear temperature dependence--pnictides--prefactor--quantitative agreement--spin susceptibility--temperature dependence--fermi liquids--fermions--liquids--magnetic susceptibility--temperature distribution--spin dynamics
Аннотация: We propose an explanation of the peculiar linear temperature dependence of the uniform spin susceptibility chi(T) in ferropnictides. We argue that the linear in T term appears to be due to the nonanalytic temperature dependence of chi(T) in a two-dimensional Fermi liquid. We show that the prefactor of the T term is expressed via the square of the spin-density-wave (SDW) amplitude connecting nested hole and electron pockets. Because of an incipient SDW instability, this amplitude is large, which, along with a small value of the Fermi energy, makes the T dependence of chi(T) strong. We demonstrate that this mechanism is in quantitative agreement with the experiment.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pyatnov M. V., Vetrov S. Ya., Timofeev I. V.
Заглавие : Controlled photonic surface modes in 'cholesteric liquid crystal - Phase plate - Metal' structure
Коллективы : Progress In Electromagnetics Research Symposium
Место публикации : Progress in Electromagnetics Research Symposium: Proceedings. - 2015. - Vol. 2015-January. - P.224-227. - ISBN 9781934142301
Ключевые слова (''Своб.индексиров.''): cholesteric liquid crystals--crystal structure--light transmission--liquid crystals--liquids--optical kerr effect--plates (structural components)--chiral media--external fields--forward-and-backward--light transmission spectra--propagation of lights--surface modes--waveguide surfaces--plate metal
Аннотация: Light transmission spectrum has been calculated for a 'cholesteric liquid crystal-phase plate-metal' structure. It is shown that the system can have an isolated waveguide surface mode with characteristics efficiently controllable by external fields acting on the cholesteric. This mode is similar to optical Tamm state. We observed anisotropy of transmission of the structure under consideration in the propagation of light of a certain polarization in forward and backward directions. This property is inherent in optically chiral media, such as the cholesteric liquid crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Light transmission of liquid crystal domains formed by polycarbonate surface
Место публикации : Opt. Mater. Express: Optical Society of America, 2016. - Vol. 6, Is. 9. - P.2841-2846. - ISSN 21593930 (ISSN), DOI 10.1364/OME.6.002841
Примечания : Cited References: 15. - This work was partially supported by the Russian Foundation for Basic Research (projects Nos. 15-02-06924 and 16-53-00073), and by the Siberian Branch of the Russian Academy of Sciences (SB RAS) through Complex Program No. II.2P 0358-2015-0011, 0358-2015-0010.
Ключевые слова (''Своб.индексиров.''): electric fields--electric lines--laser beams--liquid crystals--liquids--nematic liquid crystals--polycarbonates--refractive index--coherence distance--disclination lines--interference oscillations--liquid crystal layers--monochromatic lasers--polarization direction--polymer surfaces--radial orientation--light transmission
Аннотация: We investigate the optical transmission of a monochromatic laser beam passing through an individual domain of a nematic liquid crystal formed by the polycarbonate surface. The domain has the radial orientation structure with a disclination line on the polymer surface, which gradually transforms to "pseudoplanar" alignment at the coherence distance ? from the surface. The dependence of the optical transmittance on an electric field applied to the domain are different at various light polarization directions relative to the disclination lines and, in the absence of an analyzer, are accompanied by interference oscillations. To explain the results obtained, a domain is considered to be a gradient lens with the refractive index variable in the plane perpendicular to the laser beam and the resulting deflecting effect that was collected at the beam path through the liquid crystal layer. © 2016 Optical Society of America.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimov V. S., Ershov A. E., Gavrilyuk A. P., Karpov S. V., Agren H., Polyutov S. P.
Заглавие : Suppression of surface plasmon resonance in Au nanoparticles upon transition to the liquid state
Место публикации : Opt. Express: Optical Society of America, 2016. - Vol. 24, Is. 23. - P.26851-26856. - ISSN 10944087 (ISSN), DOI 10.1364/OE.24.026851
Примечания : Cited References: 24. - This work was performed within the State contract of the RF Ministry of Education and Science for Siberian Federal University for scientific research in 2014–2016 (Reference number 1792) and SB RAS Program No II.2P (0358-2015-0010). The numerical calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): electron scattering--gold--lattice constants--liquids--melting--metal nanoparticles--nanoparticles--surface plasmon resonance--electron phonon couplings--experimental spectra--experimental values--gold nanoparticles--nonlinear optical response--plasmonic nanoparticle--relaxation constants--surface plasmon frequency--plasmons
Аннотация: Significant suppression of resonant properties of single gold nanoparticles at the surface plasmon frequency during heating and subsequent transition to the liquid state has been demonstrated experimentally and explained for the first time. The results for plasmonic absorption of the nanoparticles have been analyzed by means of Mie theory using experimental values of the optical constants for the liquid and solid metal. The good qualitative agreement between calculated and experimental spectra support the idea that the process of melting is accompanied by an abrupt increase of the relaxation constants, which depends, beside electronphonon coupling, on electron scattering at a rising number of lattice defects in a particle upon growth of its temperature, and subsequent melting as a major cause for the observed plasmonic suppression. It is emphasized that observed effect is fully reversible and may underlie nonlinear optical responses of nanocolloids and composite materials containing plasmonic nanoparticles and their aggregates in conditions of local heating and in general, manifest itself in a wide range of plasmonics phenomena associated with strong heating of nanoparticles. © 2016 Optical Society of America.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pyatnov M. V., Vetrov S. Ya., Timofeev I. V.
Заглавие : Localized optical modes in a defect-containing liquid-crystal structure adjacent to the metal
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2017. - Vol. 34, Is. 9. - P.2011-2017. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.34.002011
Примечания : Cited References: 44. - Russian Foundation for Basic Research (RFBR), Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund (17-42-240464).
Ключевые слова (''Своб.индексиров.''): cholesteric liquid crystals--crystal defects--defects--liquid crystals--liquids--metals--optical kerr effect--polarization--diffraction reflections--external fields--field localization--maximum field intensity--metallic layers--polarization dependence--spectral properties--transmittance spectra--crystal structure
Аннотация: The possibility of the existence of localized optical modes with maximum field intensity at the interface between the metal and cholesteric liquid crystal is theoretically grounded. The system comprises a defect-containing cholesteric liquid crystal and a metal layer. It is established that the localization occurs at almost any defect thickness rather than only at the half-wave thickness, at which the loss of the polarization dependence of diffraction reflection and the absence of field localization are observed for the structure without the metallic layer. It is demonstrated that the spectral properties can be controlled by external fields affecting the liquid crystal. At large thicknesses of the cholesteric liquid crystal between the defect and the metallic layer, the spectrum contains the pronounced peaks corresponding to the edge modes. The results obtained open new opportunities for controlling the transmittance spectrum, polarization, and localization of light in optoelectronic elements based on the investigated system. © 2017 Optical Society of America.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Zyryanov V. Ya., Miskevich A. A.
Заглавие : Polarization of light by a polymer film containing elongated drops of liquid crystal with inhomogeneous interfacial anchoring
Место публикации : Opt. Spectrosc.: Maik Nauka-Interperiodica Publishing, 2017. - Vol. 122, Is. 6. - P.984-994. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X1706011X
Примечания : Cited References: 26
Ключевые слова (''Своб.индексиров.''): crystal orientation--crystal structure--drops--inverse problems--liquid crystals--liquids--polarization--polymer films--polymers--refractive index--semiconducting films--surface active agents--anomalous diffraction approximations--comparative analysis--degree of polarization--free energy density--internal structure--mechanical model--spectral polarization--transmitted light--optical films
Аннотация: An optico-mechanical model describing the coherent (directed) transmittance and the degree of polarization of forward-transmitted light by a polymer film with elongated liquid-crystal (LC) drops has been developed. This model, based on the Foldy–Twersky and anomalous-diffraction approximations, makes it possible to analyze the optical response of a film under extension as a function of the film thickness, refractive index of the polymer, the sizes and anisometry parameters of liquid-crystal drops, their concentration, internal structure, polydispersity, and orientation of optical axes. The model is verified based on the comparison of numerical and experimental data for the inverse modification of interfacial anchoring by an ion-forming surfactant. The internal drop structure is determined by solving the problem of minimizing the volume free energy density. A comparative analysis of the calculated transmittance and degree of polarization for films with uniform homeotropic and modified inhomogeneous interfacial anchoring is performed. The spectral polarization characteristics of a film with elongated LC drops and single-domain internal structure, formed under mechanical extension with the aid of surfactants, are investigated. © 2017, Pleiades Publishing, Ltd.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ershov A. E., Gerasimov V. S., Gavrilyuk A. P., Karpov S. V.
Заглавие : Surface plasmon resonances in liquid metal nanoparticles
Место публикации : Appl. Phys. B: Springer, 2017. - Vol. 123, Is. 6. - Ст.182. - ISSN 09462171 (ISSN), DOI 10.1007/s00340-017-6755-2
Примечания : This work was performed within the State contract of the RF Ministry of Education and Science for Siberian Federal University for scientifc research in 2017–2019. The numerical calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): aggregates--dimers--gold--liquids--metal nanoparticles--nanoparticles--nonlinear optics--silver--surface plasmon resonance--au nanoparticle--colloidal aggregates--experimental values--experimental verification--metallic nanoparticles--nonlinear optical response--plasmonic nanoparticle--surface plasmon frequency--plasmons
Аннотация: We have shown significant suppression of resonant properties of metallic nanoparticles at the surface plasmon frequency during the phase transition “solid–liquid” in the basic materials of nanoplasmonics (Ag, Au). Using experimental values of the optical constants of liquid and solid metals, we have calculated nanoparticle plasmonic absorption spectra. The effect was demonstrated for single particles, dimers and trimers, as well as for the large multiparticle colloidal aggregates. Experimental verification was performed for single Au nanoparticles heated to the melting temperature and above up to full suppression of the surface plasmon resonance. It is emphasized that this effect may underlie the nonlinear optical response of composite materials containing plasmonic nanoparticles and their aggregates. © 2017, Springer-Verlag Berlin Heidelberg.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Sutormin V. S., Krakhalev M. N., Gardymova A. P., Prishchepa O. O., Shabanov A. V.
Заглавие : Liquid crystal materials with ionic-surfactant operation
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2017. - Vol. 81, Is. 5. - P.594-597. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873817050288
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): crystalline materials--liquid crystals--surface active agents--b-y ions--ionic surfactants--liquid crystal materials--liquid crystalline materials--new approaches--surface-active compounds--surface-anchoring--liquids
Аннотация: A conceptually new approach for developing methods of control of liquid crystals is discussed. The approach is based on modifying surface anchoring. A brief review of the authors’ research on developing ionic-surfactant control of liquid crystalline materials is described. This approach is based on the effect of electrically induced modification of the boundary conditions by ions of surface-active compounds. © 2017, Allerton Press, Inc.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wu, Po-Chang, Chen, Hsin-Li, Rudakova, Natalya V., Timofeev I. V., Zyryanov V. Ya., Lee, Wei
Заглавие : Electro-optical and dielectric properties of polymer-stabilized blue phase liquid crystal impregnated with a fluorine-containing compound
Коллективы : Ministry of Science and Technology, Taiwan [104-2112-M-009-008-MY3, 106-2923-M-009-002-MY3]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240704, 17-42-240464]
Место публикации : J. Mol. Liq. - 2018. - Vol. 267. - P.138-143. - ISSN 0167-7322, DOI 10.1016/j.molliq.2017.12.062. - ISSN 1873-3166(eISSN)
Примечания : Cited References: 47. - The authors are indebted to Prof. Mon-Juan Lee of Chang-Jung Christian University for valuable discussions on photopolymerization. This work was financially supported by the Ministry of Science and Technology, Taiwan, through Grant Nos. 104-2112-M-009-008-MY3 and 106-2923-M-009-002-MY3, and by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects 16-42-240704 and 17-42-240464.
Предметные рубрики: HYSTERESIS
TEMPERATURE
MONOMERS
Ключевые слова (''Своб.индексиров.''): polymer-stabilized blue phase--liquid crystal--fluorine-containing--compound--operating voltage--ionic effect
Аннотация: The effects of a fluorine-containing compound (4,4′-difluorobenzophenone; DF) on the electro-optical and dielectric properties of polymer-stabilized blue phase (PSBP) liquid crystals were investigated. When a PSBP cell was driven by an in-plane electric field, the addition of DF up to 2.7 wt% effectively reduced the operation voltage by ~ 30%. Further inspection by dielectric spectroscopy indicated that the ionic concentration in PSBP decreased with increasing loading of DF. This finding can be ascribed to the complexation of impurity ions near the ketone group and carbon–fluorine bonds of the DF compound that restrained the ion transport after photopolymerization. As a result, the DF compound can be regarded as a superior ion-suppressor, enabling the reduction in the ionic effect and, in turn, the promotion of the electro-optical response of a PSBP.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Sutormin V. S., Prishchepa O. O., Kuz'menok N. M., Mikhalyonok S. G., Bezborodov V. S., Zyryanov V. Ya.
Заглавие : Anionic-cationic surfactant mixture providing the electrically controlled homeotropic surface anchoring of liquid crystals
Коллективы : International conference on Hole Burning, Single Molecule, and Related Spectroscopies: Science and Applications - 2018 , Belarusian Republican Foundation for Fundamental Research [X16P-110]; Russian Foundation for Basic Research (RFBR) [16-53-00073]; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-243006]
Место публикации : J. Mol. Liq. - 2019. - Vol. 282: Suzdal Conference (2018, Suzdal, RUSSIA). - P.57-62. - ISSN 0167-7322, DOI 10.1016/j.molliq.2019.02.132. - ISSN 1873-3166(eISSN)
Примечания : Cited References: 30. - The reported study was supported by the Belarusian Republican Foundation for Fundamental Research (project No X16P-110) and Russian Foundation for Basic Research (RFBR) (project No 16-53-00073). Mikhail N. Krakhalev and Vitaly S. Sutormin acknowledge financial support from RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (project No 18-42-243006).
Предметные рубрики: IONIC MODIFICATION
TRANSITION
DROPLETS
CONFIGURATION
LAYER
Аннотация: In search of a substance able to function as an anionic surfactant applied for the electrically-induced anchoring transitions in liquid crystals, the compound 4-heptyloxybenzoate benzyl dodecyldimethylammonium (HOBBDDA) has been synthesized. Its orienting influence on nematic liquid crystal 4-pentyl-4'-cyanobiphenyl (5CB) has been tested. HOBBDDA dissolved up to 1.4%in 50 droplets dispersed in polymer film does not change the tangential surface anchoring inherent to polyvinyl alcohol matrix used. Homeotropic surface anchoring is realized if the HOBBDDA content exceeds 1.7%. The molecules of the surfactant in 5CB dissociate into anions and cations. The anions modify the surface anchoring under the action of DC electric field both in the normal and inverse mode. The mixture of HOBBDDA and cetyltrimethylammonium bromide can function as a binary ionic cationic surfactant which significantly expands the prospects for using the ionic-surfactant method to control liquid crystal materials. (C) 2019 Elsevier B.V. All rights reserved.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Savchenko V., Ekholm V., Brumboiu I. E., Norman P., Pietzsch A., Fohlisch A., Rubensson J. -E., Grasjo J., Bjorneholm O., Sathe C., Dong M., Schmitt T., McNally D., Lu X., Krasnov P. O., Polyutov S. P., Gel'mukhanov F., Odelius M., Kimberg V.
Заглавие : Hydrogen bond effects in multimode nuclear dynamics of acetic acid observed via resonant x-ray scattering
Место публикации : J. Chem. Phys. - 2021. - Vol. 154, Is. 21. - Ст.214304. - ISSN 00219606 (ISSN), DOI 10.1063/5.0049966
Примечания : Cited References: 64. - This work was supported by the Swedish Research Council (Grant Nos. 2019-03470, 2018-4343, and 2017-06419) and the Russian Science Foundation (Project No. 16-12-10109). M.O. acknowledges financial support from the Carl Tryggers Foundation (Grant CTS18:285) and the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 860553. F.G. acknowledges the support from the Helmholtz Virtual Institute VI419 “Dynamic Pathways in Multidimensional Landscapes.” The research work of V.S. was partially funded by a Swedish Institute scholarship. The synchrotron experiments were performed at the ADRESS beamline of the Swiss Light Source at the Paul Scherrr Institut (PSI). The work at PSI was supported by the Swiss National Science Foundation through the NCCR MARVEL and the Sinergia project “Mott Physics Beyond the Heisenberg (MPBH) model” (SNSF Research Grant Nos. CRSII2:141962 and CRSII2:1607651). The research leading to these results received funding from the European Community’s Seventh Framework Programme (No. FP7/2007–2013) under Grant Agreement No. 290605 (COFUND: PSIFELLOW). The calculations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) partially funded by the Swedish Research Council through Grant Agreement No. 2018-05973
Аннотация: A theoretical and experimental study of the gas phase and liquid acetic acid based on resonant inelastic x-ray scattering (RIXS) spectroscopy is presented. We combine and compare different levels of theory for an isolated molecule for a comprehensive analysis, including electronic and vibrational degrees of freedom. The excitation energy scan over the oxygen K-edge absorption reveals nuclear dynamic effects in the core-excited and final electronic states. The theoretical simulations for the monomer and two different forms of the dimer are compared against high-resolution experimental data for pure liquid acetic acid. We show that the theoretical model based on a dimer describes the hydrogen bond formation in the liquid phase well and that this bond formation sufficiently alters the RIXS spectra, allowing us to trace these effects directly from the experiment. Multimode vibrational dynamics is accounted for in our simulations by using a hybrid time-dependent stationary approach for the quantum nuclear wave packet simulations, showing the important role it plays in RIXS.
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16.

Вид документа : Статья из журнала
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Автор(ы) : Minakov A. V., Pryazhnikov M. I., Simunin M. M., Dobrosmyslov S. S., Kuular A. A., Molokeev M. S., Volochaev M. N., Khartov S. V., Voronin A. S.
Заглавие : Rheological properties of colloidal suspensions of alumina nanofibers
Место публикации : J. Mol. Liq. - 2022. - Vol. 367. - Ст.120385. - ISSN 01677322 (ISSN), DOI 10.1016/j.molliq.2022.120385
Примечания : Cited References: 62. - This work is partially financed by Ministry of Science and Higher Education of the Russian Federation (project no. FSRZ-2020-0012)
Аннотация: We have studied the rheological properties of colloidal suspensions based alumina nanofibers (ANF) with a mass fraction of 0.125–2 wt%. The ANFs used in this work are stand out by a high aspect ratio L/D ∼ 106–107 (dry ANF before dispersion) and ease of dispersion due to the self-organized aligned structure of ANF, which is characteristic of our synthesis method. It was shown that ANF suspensions are characterized by high colloidal stability, zeta potential has a significant dependence on ANF volume fraction. ANF have a strong effect on the shear viscosity of colloidal suspensions; non-Newtonian behavior is observed in suspensions with an ANF mass fraction of 0.5 wt%. A comprehensive study of the propagation of ultrasound in ANF suspensions was carried out. Based on experimental results on the scattering of ultrasound in suspensions and theoretical calculations, data on the bulk viscosity of ANF suspensions were obtained for the first time. The results of the study allow us to judge the possibility of using ANF as a promising fibrous additive to optimize the rheological properties of suspensions for various technical purposes, which include drilling muds, paint and varnish compositions, concrete-cement mixtures.
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17.

Вид документа : Статья из журнала
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Автор(ы) : Chang Y.-C., Yang S.-H., Zyryanov V. Ya., Lee W.
Заглавие : Electrically tunable thermoresponsive optic switch for smart window application based on dye-doped cholesteric liquid crystal
Колич.характеристики :9 с
Место публикации : J. Mol. Liq. - 2023. - Vol. 388. - Ст.122752. - ISSN 01677322 (ISSN), DOI 10.1016/j.molliq.2023.122752. - ISSN 18733166 (eISSN)
Примечания : Cited References: 24. - This work was financially supported by National Science and Technology Council, Taiwan (NSTC), under Grant Nos. 110-2112-M-A49-023 and 111-2112-M-A49-033
Аннотация: We demonstrate a cholesteric liquid crystal (CLC) smart window that functions as a reversible thermo-optic switch between a transparent state at a low temperature and a low-transmission state at a higher temperature. This smart window is based on the addition of a thermoresponsive handedness-reversible chiral dopant in a mixture of a typical chiral dopant, a dichroic dye and nematic liquid crystal, yielding a thermosensitized CLC. In such a homeotropically anchored dye-doped CLC, the thickness-to-pitch ratio increases as the temperature rises, causing the device to switch from the homeotropic texture to the fingerprint texture. The absorption characteristic of the dichroic dye enables the homeotropic and fingerprint configurations in the dye-doped CLC to create two distinct transmission levels—the transparent and opaque optically stable states, respectively. Such a switching mechanism entails no additional electric power and, thus, is energy-saving. Moreover, the switching temperature at which the texture transition takes place can be actively increased by increasing voltage for the smart window. This allows the CLC device to be perfectly adaptable to the need of a user and, in turn, applicable to a wider variety of environments.
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18.

Вид документа : Статья из журнала
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Автор(ы) : Krakhalev M. N., Gardymova A. P., Rudyak, Vladimir Yu., Barbashov, Vadim A., Zyryanov V. Ya.
Заглавие : Electrically induced transformation of cholesteric droplets under homeotropic boundary conditions
Колич.характеристики :7 с
Место публикации : J. Mol. Liq. - 2023. - Vol. 385. - Ст.122379. - ISSN 01677322 (ISSN), DOI 10.1016/j.molliq.2023.122379. - ISSN 18733166 (eISSN)
Примечания : Cited References: 37. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038. The research was carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University
Аннотация: Cholesteric droplets under homeotropic boundary conditions demonstrate a rich variety of possible orientational structures. We have implemented electrically controlled switching of such droplets between two classes of stable states: i) structures with cylindrical cholesteric layers and ii) layer-like structures with one or more λ+1/2-disclinations. Structure relaxation after switching off the voltage proceeded via the fast (less than 1 s), the slow (more than 1 s), and the stabilization stages (~10 hours). We investigated intermediate long-lived metastable states occurring in the relaxation process and explained the formation of various structures in cholesteric droplets. The fast and the slow stages of relaxation were found to be sensitive to the voltage reduction regime. We have determined the combinations of droplet size and voltage reduction regimes leading to the two types of structures after relaxation.
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