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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Харченко И. А., Минаков А. В., Михлина Е. В., Немцев, Иван Васильевич, Рыжков И. И.
Заглавие : Экспериментальное и расчетное исследование осаждения углерода в мембранах пористого анодного оксида алюминия
Коллективы : "Решетневские чтения", международная научно-практическая конференция, Сибирский государственный университет науки и технологий им. акад. М. Ф. Решетнева, Информационные спутниковые системы им. академика М. Ф. Решетнева, АО, Красноярский машиностроительный завод, ОАО
Место публикации : Решетневские чтения: [Электронный ресурс] : материалы XXIV Междунар. науч.-практич. конф., посвящ. памяти ген. конструктора ракет.-космич. систем акад. М. Ф. Решетнева : в 2-х ч. : электронное издание. - Красноярск: СибГУим. М. Ф. Решетнева, 2020. - Ч. 1. - С. 553-555
Примечания : Библиогр.: 8. - Работа выполнена при финансовой поддержке РФФИ, проект No 18-29-19078 мк. Физико-химический анализ материалов был выполнен в Красноярском региональном центре коллективного пользования ФИЦ КНЦ СО РАН
Аннотация: Проведено экспериментальное исследование процесса формирование углеродных слоев в мембранах пористого анодного оксида алюминиям етодом CVD. Экспериментальные зависимости скорости роста углерода от температуры и расхода аргона хорошо согласуются с расчетами на основе математической модели
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Морозов, Евгений Владимирович, Больбасов Е. Н., Горенинский С. И., Юрков Г. Ю., Бузник, Вячеслав Михайлович
Заглавие : МРТ исследование процессов замерзания воды и таяния льда в полимерных композиционных мембранах
Место публикации : Полимер. матер. и технол. - 2020. - Т. 6, № 4. - С. 20-29. - ISSN 2415-7260, DOI 10.32864/polymmattech-2020-6-4-20-29
Примечания : Библиогр.: 23
Аннотация: Полимерные композиционные мембраны, полученные методом электроформования, находят широкое применение в различных отраслях промышленности благодаря своей структуре и уникальным свойствам. Однако, вследствие высокой сорбционной активности изделия на основе таких мембран подвержены негативному влиянию атмосферной влаги в условиях знакопеременного температурного воздействия. В данной работе представлены новые полимерные композиционные мембраны с улучшенными водоотталкивающими свойствами, сочетающие слои гидрофобных и гидрофильных волокнистых материалов. Впервые проведены МРТ исследования процессов замерзания воды и таяния льда в них. Детально изучены качественная и количественная стороны протекающих процессов. Обнаружено, что водопоглощение в композиционных мембранах осуществляется исключительно за счет слоев гидрофильного материала. Исследование также показало, что скорость протекания процессов замерзания/таяния оказалась чувствительна к присутствию гидрофобных слоев: обнаружено, что введение слоев гидрофобных волокон в композит приводит к существенному снижению скорости замерзания и таяния. Полученный результат демонстрирует возможности метода МРТ для исследования и диагностики полимерных волокнистых материалов и процессов замерзания/таяния в них, а также показывает пути оптимизации свойств готовых полимерных материалов для арктических и иных практических приложений.Electrospun polymer composite membranes are very attractive for many industrial applications due to their special structure and properties. However, high sorption capacity of fibrous material results in noticeable moisture content in the membranes which then, being exposed to natural environment, suffer from the freeze/thawing cycling. In this work, the new polymer composite membranes with advanced water resistance due to a layered hydrophobic/hydrophilic structure were manufactured via electrospinning. Using these membranes the NMR imaging study of water freezing and ice thawing were carried out for the first time. In result, the qualitative and quantitative character of the processes was elucidated. Thus, it was found out that the water uptake in membranes occurs solely due to the hydrophilic layers. From the other hand, the hydrophobic layers play a major role, affecting the rate of freeze/thawing: introduction the hydrophobic material into membranes structure makes the freeze/thawing front propagation slow down. The results obtained demonstrate the advantages of the NMR imaging as a tool for studying and control of the polymer fibrous materials, processes of water sorption and water freezing/thawing occurring under the natural environment conditions. New results also show the routes of polymer materials optimization for arctic and other practical applications.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kvashnin A.G., Sorokin P.B., Kvashnin D.G.
Заглавие : The theoretical study of mechanical properties of gra?phene membranes
Коллективы : "Fullerenes and Atomic Clusters", Biennial International Workshop
Место публикации : 9th Biennial International Workshop "Fullerenes and Atomic Clusters" (IWFAC 2009): July 6-10, 2009, St Petersburg, Russia : abstracts. - 2009. - Ст.P2.9. - С. 80
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Iskhakov R. S., Chekanova L. A., Denisova E. A., Bukaemskiy A.A., Melnikova S.V.
Заглавие : Synthesis and investigation of nanostructured Fe1-xNi x(P) columns deposited into porous polycarbona te matrix
Место публикации : Physics, Chemistry and Application of Nanostructures - Proceedings of the International Conference, NANOMEETING 2009. - 2009. - International Conference on Physics, Chemistry and Application of Nanostructures, NANOMEETING 2009 (26 May 2009 through 29 May 2009, Minsk, ) Conference code: 99438. - С. 264-267. - ISBN 9814280356 (ISBN); 9789814280358 (ISBN)
Ключевые слова (''Своб.индексиров.''): exchange constants--macroscopic anisotropy--morphological characterization--nano-structured fe--nanocrystallines--perpendicular anisotropy--porous polycarbonate membranes--shape anisotropy--magnetic anisotropy--nanostructures--nickel
Аннотация: Ferromagnetic Fe1-xNix(P) (x=24-65 at.%.) columns have been chemically deposited into porous polycarbonate membranes with pore diameters of 0.1-4 J.Im. The morphological characterization by TEM reveals the shape features in synthesized columns. Their magnetic perpendicular anisotropy due to the shape anisotropy of columns was observed. The dependence of macroscopic anisotropy on pore diameter and Ni content is analyzed. Approach to magnetic saturation curves and exchange constant of nanocrystalline fe?.xNix(P) columns deposited into porous pol}\:arbonate matrix are investigated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ryzhkov, Ilya I., Shchurkina, Margarita A., Mikhlina, Elena, V, Simunin, Mikhail M., Nemtsev I. V.
Заглавие : Switchable ionic selectivity of membranes with electrically conductive surface: Theory and experiment
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-38-20046]
Место публикации : Electrochim. Acta. - 2021. - Vol. 375. - Ст.137970. - ISSN 0013-4686, DOI 10.1016/j.electacta.2021.137970. - ISSN 1873-3859(eISSN)
Примечания : Cited References: 67. - This work is supported by the Russian Foundation for Basic Research , Project 18-38-20046 . The physicochemical analysis of materials was carried out in Krasnoyarsk Regional Center of Research Equipment of Federal Research Center 'Krasnoyarsk Science Center SB RAS'
Аннотация: Nanoporous membranes with electrically conductive surface represent an important class of stimuli–responsive materials. The variation of surface potential provides a powerful tool for adjusting ionic selectivity, conductivity, and rejection. This work is devoted to the theoretical and experimental study of switchable ionic selectivity. The one–dimensional Space charge (SC) and two–dimensional Uniform potential (UP) models are first generalized to constant surface potential case taking into account the Stern layer with inner (iHp) and outer (oHp) Helmholtz planes. The ionic selectivity is investigated experimentally by measuring the membrane potential at zero current for C–Nafen membranes prepared from alumina nanofibers with conductive carbon coating. The evolution of charging current is used to determine the dependence of surface charge density and differential capacitance on the applied potential. These data are fitted by the UP and SC models to find the Stern layer capacitance. It is shown that the variation of surface potential results in a continuous change of ionic selectivity from anion to cation. The membrane potential data are fitted by the UP and SC models using the chemical charge density and concentration boundary layer thickness as fitting parameters. It allows to determine the potential, at which the membrane becomes non–selective. The SC and UP models provide close results for membrane potential and surface charge density and demonstrate a good agreement with the experimental data. The UP model overestimates the solution velocity and ion concentrations at the membrane surface, while it underestimates the ion fluxes and iHp/oHp potentials. This work essentially extends our understanding of ion transport in stimuli–responsive membranes operated by the electric field. The results can be applied in the area of nanofiltration, (reverse) electrodialysis, electrochemical sensors, and nanofluidic devices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Simunin M. M., Khartov S. V., Shiverskii A. V., Zyryanov V. Ya., Fadeev, Yu. V., Voronin A. S.
Заглавие : Structures based on graphitized nanotubulenes with a common electrode in a matrix of porous anodic alumina for the purpose of forming electrically switchable membranes
Коллективы : Russian Science Foundation [15-19-10017]
Место публикации : Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 41, Is. 11. - P.1047-1050. - ISSN 1063-7850, DOI 10.1134/S1063785015110103. - ISSN 1090-6533(eISSN)
Примечания : Cited References:20. - This work was supported financially by the Russian Science Foundation, project no. 15-19-10017
Предметные рубрики: POLYPEPTIDE BRUSH
ION-TRANSPORT
PERMEABILITY
POLYMER
PHOTOREGULATION
PERMEATION
ACID
Аннотация: A structure based on porous anodic alumina with through pores is synthesized. This structure may be of some interest in terms of fabricating electrically switchable membranes. Conducting tubulenes connected to a common input electrode are located in the pores of the structure. It is hypothesized that enhancement of the electric field nonuniformity associated with the indicated structure morphology should help raise the degree of ionic selectivity of the membrane and broaden the range of permissible concentrations of ions in the processed solution. An suggestion regarding the structure of synthesized tubulenes in the context of the problem of suppressing the physical sorption of ions on the pore surface and raising the hydrogen and oxygen reduction potentials relative to those of state-of-the-art field-switchable membranes is also made.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Self-organized ensembles of nematic domains in magnetic and electric fields
Место публикации : Phys. Rev. E. - 2022. - Vol. 106, Is. 2. - Ст.024703. - ISSN 24700045 (ISSN), DOI 10.1103/PhysRevE.106.024703
Примечания : Cited References: 33
Аннотация: The structural and magneto- and electro-optical properties of a self-organized ensemble of nematic domains formed on a polycarbonate film in the presence of a residual solvent are studied. The film covered one of the plane-parallel glass plates of a liquid crystal cell. The magnetic field stabilizing the planar alignment of the liquid crystal was applied parallel to the cell surfaces and the reorienting electric field, perpendicular to them. The voltage dependences of the intensity of light transmitted through the domain ensemble were obtained at different constant values of the magnetic field. The comparison of the experimental dependences with the dependences calculated using the liquid crystal free-energy minimization procedure has shown good agreement between them. The mutual effect of structural elements of the ensemble and the effects of phase modulation of light are analyzed by comparing the structural, magnetic, and electric coherence lengths.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AVERYANOV E. M.
Заглавие : POLARIZED LUMINESCENCE SPECTRUM OF IMPURITY LIQUID-CRYSTAL - THE DEGENERATION LIFTED AND RENEWED BY RELAXATION
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 103, Is. 6. - P2018-2038. - ISSN 0044-4510
Примечания : Cited References: 45
Предметные рубрики: RESOLVED FLUORESCENCE DEPOLARIZATION
UNIAXIAL MOLECULAR SAMPLES
NEMATIC ORDER PARAMETERS
EXCITED-STATES
SPECTROSCOPY
MEMBRANES
FLUOROPHORES
ORIENTATION
TRANSITION
DYES
Аннотация: The general molecular-statistical approach is proposed for the analysis or the polarized luminescence spectrum for impurity molecule of an arbitrary symmetry in the nematic liquid crystal matrix. On the particular example of uniaxial molecules the influence of features of the molecular electron structure, orientational statistics, molecular dynamics, and features of the anisotropic intermolecular coupling upon the positions of maxima v(if)(t) of impurity fluorescence polarized bands J(ij)(t) is studied. For the first time it is shown that all these factors significantly affect the degree of spectrum v(ij)(t) degeneration. For t not-equal 0, relaxation of excited impurity molecule subsystem toward the orientational distribution lifts a partial degeneration of spectrum v(ij), occuring at t not-equal 0, and renews partial or total degeneration of spectrum v(ij) in the limit t = infinity. In the lack of the spectrum v(ij) degeneration for t = 0 the relaxation may restore partial degeneration for t not-equal 0 as a function of the features of electron structure of molecules. The results of work explain the familiar experimental data on the number of independent component v(ij) and relation between them, on dependence of v(ij) upon the order of matrix and impurity subsystem, on the mutual relation in the positions of impurity band polarized component in the absorption and fluorescence spectra.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Chekanova L. A., Mel'nikova S. V., Komogortsev S. V., Denisova E. A., Iskhakov R. S., Bukaemsky A. A., Chizhik N. A.
Заглавие : Nanocrystalline FeNi(P) columns in polycarbone membranes: synthesis and magnetic properties
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 179. - ISBN 978-5-7444-3124-2
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Iskhakov R. S., Chekanova L. A., Denisova E. A., Komogortsev S. V., Bukaemskiy A. A., Polochanina S. V., Momot N. A.
Заглавие : Magnetic properties of nanocrystalline FeNi(P) columns in polycarbone membranes
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2008): June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст.22PO-8-31. - p.284-285
Примечания : Библиогр.: 1. - Support by Russian program “Development of Science in High School” (2006-2008)–RNP.2.1.1.7376; the grant RFBR 07-02-01172-а; National Science Fund (2008, PhD RAS) are acknowledged
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komogortsev S. V., Denisova E. A., Chekanova L. A., Bukaemskiy A. A., Iskhakov R. S., Mel'nikova S. V., Chizhik M. V.
Заглавие : Magnetic anisotropy of nanocrystalline FeNi(P) columns electroless deposited in polycarbonate membranes
Коллективы : Annual conference on мagnetism and мagnetic мaterials
Место публикации : 58th Annual conference on мagnetism and мagnetic мaterials : abstacts. - 2013. - P.580
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Local-Field Anisotropy of a Light Wave in Quasi-Two-Dimensional Soft-Matter Objects
Коллективы :
Разночтения заглавия :авие SCOPUS: Local-field anisotropy of a light wave in quasi-two-dimensional soft-matter objects
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 110, Is. 4. - P622-636. - ISSN 1063-7761, DOI 10.1134/S1063776110040102
Примечания : Cited References: 73. - This study was supported by the Presidium of the Russian Academy of Sciences within the Program of Basic Research (project no. 27.1) and the Siberian Branch of the Russian Academy of Sciences within the Program of Interdisciplinary Basic Research (project no. 5).
Предметные рубрики: INTEGRATED OPTICAL TECHNIQUES
LANGMUIR-BLODGETT-FILMS
SMECTIC LIQUID-CRYSTALS
UNIAXIAL POLYMER-FILMS
MOLECULAR-ORIENTATION
INTERNAL FIELD
DIELECTRIC-CONSTANT
SPECTRAL FEATURES
REFRACTIVE-INDEX
THIN-FILMS
Ключевые слова (''Своб.индексиров.''): anisotropic films--bilayer lipid membrane--chemical structure--comblike polymers--conductive polymer--discotics--dispersion of refractive index--experimental data--experimental values--hexatic-b phase--isotropization--langmuir films--light wave--lorentz--macromolecular polymers--model approach--molecular polarizabilities--optical axis--order parameter--orientational order parameters--orientational orderings--orientational orders--smectic layers--smectic-a--smectics--soft matter--structural unit--sub-micron films--substrate types--tensor components--visible range--anisotropy--cell membranes--conductive plastics--conjugated polymers--electronic structure--light measurement--liquid crystal polymers--molecules--multilayer films--organic polymers--phase transitions--polarization--polymers--refractive index--substrates--tensors--two dimensional--conductive films
Аннотация: Experimental values of the Lorentz tensor components L-j for uniaxial quasi-two dimensional "soft matter" objects on substrates (bilayer lipid membranes, multilayer Langmuir films, smectics A, hexatic smectics B, submicron films of discotics Col(hd), micron anisotropic films of liquid-crystal comblike polymers and macromolecular polymers, submicron films of conjugated conductive polymers), freely suspended sub-micron films of smectics A, and uniaxially stretched micron films of conjugated conductive polymers have been determined using dispersion of refractive indices in the visible range. The dependences of the components L-j on the type of orientation (axial, planar) of uniaxial molecules (structural units of the film) with respect to the optical axis of the film, the film thickness, the substrate type, the chemical structure of molecules, and their long-range orientational order are established. It is revealed that the smectic A-hexatic B phase transition and two-dimensional crystallization of the smectic layer lead to changes in the components L-j due to the change in the orientational ordering of molecules as a result of the relation between the orientational and hexatic order parameters. All the above objects are characterized by isotropization of the Lorentz tensor L and the local-field tensor f with a simultaneous decrease in the birefringence of the sample and in the anisotropy of the molecular polarizability due to the change in the electronic structure of molecules. The correction for the anisotropy of the local-field tensor f to the orientational order parameter or the anisotropy of the molecular polarizability increases. The existing model approaches to calculating the components L-j for the objects under consideration are compared with the experimental data.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fadeeva N. P., Pavlov M. V., Kharchenko I. A., Simunin M. M., Shabanova K. A., Pavlov V. F., Ryzhkov I. I.
Заглавие : High strength ceramic substrates based on perlite and foam silicates for filtration membranes
Место публикации : Membr. Membr. Technol. - 2022. - Vol. 4, Is. 3. - P.170-176. - ISSN 25177516 (ISSN), DOI 10.1134/S2517751622030040
Примечания : Cited References: 32. - The work was performed using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences. This work was partially supported by the Russian Foundation for Basic Research, grant no. 18-29-19078
Аннотация: Samples of two-layer ceramics based on polydisperse powder of the pearlite mineral and foam silicates possessing high compressive strength up to 50 MPa, thermal stability up to 1150°C, and water permeability of 272 m3/h m2 bar have been obtained. According to the X-ray powder diffraction analysis, the supporting substrate material is X-ray amorphous. The average pore size of the supporting substrate is 40 µm, while the average pore size of the modifying layer is 17 µm according to the bubble method and electron microscopy. The obtained materials are promising for use as substrates of microfiltration, ultrafiltration, and nanofiltration membranes.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ryzhkov I. I., Kharchenko I. A., Mikhlina E. V., Minakov A. V., Guzei D. V., Nemtsev I. V., Volochaev M. N., Korobko A. V., Simunin M. M.
Заглавие : Growth of carbon nanotubes inside porous anodic alumina membranes: Simulation and experiment
Место публикации : Int. J. Heat Mass Transf. - 2021. - Vol. 176. - Ст.121414. - ISSN 00179310 (ISSN), DOI 10.1016/j.ijheatmasstransfer.2021.121414
Примечания : Cited References: 57. - This work is supported by the Russian Foundation for Basic Research, Project 18-29-19078
Аннотация: Porous anodic alumina (PAA) membranes represent a widely used and extensively studied template for production of carbon nanotubes (CNT). The PAA–CNT membranes possess a number of unique properties, such as controllable nanotube geometry, size– and chemically–based selectivity as well as high water permeability. In this work, we first propose a combination of gas phase and surface reaction models to quantitatively describe the growth of carbon nanotubes in PAA membranes in a commercial CVD reactor. A complimentary experimental study of CNT formation from ethanol precursor with argon as a carrier gas is performed. A new method for characterizing carbon nanotubes geometry by SEM and TEM image processing of membrane cross–sections is proposed. The simulations show that the carbon growth rate (in nm/min) averaged over the membrane remains constant during the deposition process until the pore diameter becomes relatively small, and rapidly falls to zero after that. The carbon nanotube thickness near the membrane surface is slightly higher than that in the membrane center. The carbon growth rate increases with synthesis temperature and pressure, while it decreases with the argon flow rate. The dependence of carbon growth rate on the ethanol/water flow rate reaches maximum at some intermediate value. These results are supported by the experimental data obtained from SEM/TEM image processing. It is found that the SEM data provide overestimated values of nanotube diameter and thickness in comparison with the TEM data. The obtained results provide new insights into the CNT growth kinetics in nanoporous media, and develop quantitative guidelines for synthesis of CNT–PAA membranes with precisely controlled nanopore geometry. It also validates the combined homogenous / heterogeneous reaction model by comparison with carbon deposition kinetics on a nanometer scale.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chilom, Claudia G., Zorilă, Bogdan, Bacalum M., Bălăşoiu, Maria, Yaroslavtsev R. N., Stolyar S. V., Tyutyunnicov, Sergey
Заглавие : Ferrihydrite nanoparticles interaction with model lipid membranes.
Место публикации : Chem. Phys. Lipids. - 2020. - Vol. 226. - Ст.104851. - ISSN 0009-3084, DOI 10.1016/j.chemphyslip.2019.104851. - ISSN 1873-2941 (eISSN)
Примечания : Cited References: 70. - The work was accomplished with the financial support of the 2019 RO-JINR Project Investigation of biogenic and chemically synthesized systems in interaction with biostructures for applied research, Theme 02-1-1107-2011/2019 and of the Romanian National Authority for Scientific Research, CNDI-UEFISCDI, Project numbers: PN 18 09 02 02/2018 and PN 19 06 02 03/2019. The authors are very much indebted to Professor Dr. Aurel Popescu, for very helpful suggestions and permanent encouragement.
Аннотация: In recent years was observed an increased interest towards the use of metal nanoparticles for various biomedical applications, such as therapeutics, delivery systems or imaging. As biological membranes are the first structures with which the nanoparticles interact, it is necessary to understand better the mechanisms governing these interactions. In the present paper we aim to characterize the effect of three different ferrihydrite nanoparticles (simple or doped with cooper or cobalt) on the fluidity of model lipid membranes. First we evaluated the physicochemical properties of the nanoparticles: size and composition. Secondly, their effect on lipid membranes was also evaluated using Laurdan, TMA-DPH and DPH fluorescence. Our results can help better understand the mechanisms involved in nanoparticles and membrane interactions.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T., Goncharov D., Sukovatyi A. G., Shabanov A. V., Nikolaeva E., Shishatskaya E.
Заглавие : Electrospinning of polyhydroxyalkanoate fibrous scaffolds: effects on electrospinning parameters on structure and properties
Коллективы : Project 'Biotechnologies of novel biomaterials: innovative biopolymers and devices for biomedicine' [1, 11.G34.31.0013]; Government of the Russian Federation [220]; RF President for supporting young Doctors of Sciences [MD-3112.2012.4]
Место публикации : J. Biomater. Sci.-Polym. Ed.: Taylor & Francis, 2014. - Vol. 25, Is. 4. - P.370-393. - ISSN 0920-5063, DOI 10.1080/09205063.2013.862400. - ISSN 1568-5624
Примечания : Cited References: 52. - This study was financially supported by Project 'Biotechnologies of novel biomaterials: innovative biopolymers and devices for biomedicine' (Agreement No. 1 of 15.02.2013 to Agreement No. 11.G34.31.0013) in accordance with Resolution No. 220 of the Government of the Russian Federation of April 9, 2010, 'On measures designed to attract leading scientists to the Russian institutions of higher learning' and Grant of the RF President for supporting young Doctors of Sciences No. MD-3112.2012.4.
Предметные рубрики: TISSUE ENGINEERING APPLICATIONS
FIBER MATS
POLY 3-HYDROXYBUTYRATE
POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYVALERATE)
BIOCOMPATIBILITY
PROLIFERATION
FABRICATION
NANOFIBERS
COPOLYMERS
MEMBRANES
Ключевые слова (''Своб.индексиров.''): electrospinning--polyhydroxyalkanoates--ultrafine fibers--physical-mechanical properties--fibroblast cells
Аннотация: IIn this study, electrospinning was used to prepare ultrafine fibers from PHAs with different chemical compositions: P(3HB) and copolymers: P(3HB-co-4HB), P(3HB-co-3HV), and P(3HB-co-3HHx). The main process parameters that influence ultrafine fiber diameter and properties (polymer concentration, solution feeding rate, working distance, and applied voltage) have been investigated and their effects evaluated. The study revealed electrospinning parameters for the production of high-quality ultrafine fibers and determined which parameters should be varied to tailor the properties of the products. This study is the first to compare biological and physical-mechanical parameters of PHAs with different chemical compositions as dependent upon the fractions of monomers constituting the polymers and ultrafine fiber orientation. Mechanical strength of aligned ultrafine fibers prepared from different PHAs is higher than that of randomly oriented ones; no significant effect of ultrafine fiber orientation on surface properties has been found. None of the fibrous scaffolds produced by electrospinning from PHAs had any adverse effects on attachment, growth, and viability of NIH 3T3 mouse fibroblast cells, and all of them were found to be suitable for tissue engineering applications.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Kumakhov M. A., Shabanov V. F.
Заглавие : Dielectric properties of liquid crystals in polycapillary matrices
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 6. - P1315-1322. - ISSN 1063-7834, DOI 10.1134/S1063783410060314
Примечания : Cited References: 24. - This study was supported by the Council on Grants from the President of the Russian Federation (grant no. 3818.2008.3) and the Siberian Branch of the Russian Academy of Sciences (Integration Project no. 5) and performed within the framework of the State Contract (no. 02.740.11.0220).
Предметные рубрики: MOLECULAR-SIEVES
SILICA AEROGEL
POROUS-GLASS
MEMBRANES
NMR
8CB
Аннотация: This paper reports on the results of investigations into the dielectric properties of liquid crystals embedded in polycapillary matrices and describes a technique for their measurement. It has been revealed that the chemical structure of the rigid core and the length of mobile alkyl groups of liquid-crystal molecules of the alkylcyanobiphenyl group substantially affect the equilibrium configuration of the liquid-crystal director in capillaries. The reorientation of liquid-crystal molecules embedded in capillaries in the nematic phase under the influence of an external magnetic field has been investigated.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fomenko E. V., Akimochkina G. V., Anshits A. G., Fadeeva N. P., Kharchenko I. A., Elsuf’ev E. V., Shabanova K. A., Maksimova A. A., Ryzhkov I. I.
Заглавие : Ceramic substrates for filtration membranes based on fine fly ash microspheres
Колич.характеристики :13 с
Место публикации : Membr. Membr. Technol. - 2024. - Vol. 6, Is. 2. - P.71-83. - ISSN 25177516 (ISSN), DOI 10.1134/S2517751624020033. - ISSN 25177524 (eISSN)
Примечания : Cited References: 58. - The work was carried out with the support of the Russian Science Foundation, project no. 23-19-00269, using the equipment of the Krasnoyarsk Regional Center for Collective Use at the Krasnoyarsk Federal Research Center of the Siberian Branch of the Russian Academy of Sciences
Аннотация: A procedure has been proposed for producing ceramic substrates for filtration membranes based on a narrow fraction of fine fly ash microspheres using cold uniaxial pressing followed by high-temperature firing. It has been shown that increasing the sintering temperature from 1000 to 1150°C leads to a decrease in open porosity from 40 to 24%, a decrease in the average pore size from 1.60 to 0.34 μm, and an increase in the compressive strength from 9.5 to 159 MPa. The resulting substrates are characterized by water permeability values of 1210, 310, 240, 170 L m−2 h−1 bar−1 at sintering temperatures of 1000, 1050, 1100 and 1150°C, respectively. Experiments on filtration of aqueous suspensions of fine microspheres (dav = 2.5 µm) and microsilica (dav = 1.9 μm) through a substrate produced at a sintering temperature of 1150°C have shown the rejection close to 100%. The proposed methodology for using ash waste in the production of membrane materials promotes the development of technologies for the integrated processing of thermal energy waste.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Demidenko, Aleksey V., Murueva, Anastasiya V., Dudaev, Alexey E., Nemtsev I. V., Shishatskaya, Ekaterina I.
Заглавие : Biodegradable polyhydroxyalkanoates formed by 3- and 4-hydroxybutyrate monomers to produce nanomembranes suitable for drug delivery and cell culture
Колич.характеристики :23 с
Место публикации : Technologies. - 2023. - Vol. 11, Is. 4. - Ст.106. - ISSN 22277080 (eISSN), DOI 10.3390/technologies11040106
Примечания : Cited References: 116. - his research was funded by State Assignment of the Ministry of Science and Higher Education of the Russian Federation (project No. 0287-2021-0025)
Аннотация: Biodegradable polyhydroxyalkanoates, biopolymers of microbiological origin, formed by 3- and 4-hydroxybutyrate monomers P(3HB-co-4HB), were used to obtain nanomembranes loaded with drugs as cell carriers by electrospinning. Resorbable non-woven membranes from P(3HB-co-4HB) loaded with ceftazidime, doripinem, and actovegin have been obtained. The loading of membranes with drugs differently affected the size of fibers and the structure of membranes, and in all cases increased the hydrophilicity of the surface. The release of drugs in vitro was gradual, which corresponded to the Higuchi and Korsmeyer-Peppas models. Antibiotic-loaded membranes showed antibacterial activity against S. aureus and E. coli, in which growth inhibition zones were 41.7 ± 1.1 and 38.6 ± 1.7 mm for ceftazidime and doripinem, respectively. The study of the biological activity of membranes in the NIH 3T3 mouse fibroblast culture based on the results of DAPI and FITC staining of cells, as well as the MTT test, did not reveal a negative effect despite the presence of antibiotics in them. Samples containing actovegin exhibit a stimulating effect on fibroblasts. Biodegradable polyhydroxyalkanoates formed by 3-hydroxybutyrate and 4-hydroxybutyrate monomers provide electrospinning non-woven membranes suitable for long-term delivery of drugs and cultivation of eukaryotic cells, and are promising for the treatment of wound defects complicated by infection.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khaydarov R., Gapurova O., Abdukhakimov M., Sadikov I., Garipov I., Krishnamurthy P. T., Zharkov S. M., Zeer G. M., Abolentseva P. A., Prudnikova S. V., Evgrafova S. Y.
Заглавие : Antimicrobial properties of nanofiltration membranes modified with silver nanoparticles
Коллективы : SFU Joint Scientific Center; Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0011]
Место публикации : Emerg. Mater. - 2022. - Vol. 5, Is. 5. - P.1477-1483. - ISSN 2522-5731, DOI 10.1007/s42247-021-00330-2. - ISSN 2522-574X(eISSN)
Примечания : Cited References: 31. - The SEM and TEM analysis was carried out in the SFU Joint Scientific Center under the support of the Ministry of Science and Higher Education of the Russian Federation (#FSRZ-2020-0011)
Аннотация: The growth of bacteria and fungi on a nanofiltration (NF) membrane is known to reduce its permeability and lifetime and increase overall energy use. Over the last decade, application of silver nanoparticles (AgNPs) has shown to present a strong potential in preventing biofouling of NF membrane processes. The paper deals with a novel facile method developed to in situ incorporate nanosilver stabilized with the polyhexamethylene biguanide hydrochloride (PHMB) onto the commercial NF membrane surface. The scanning electron microscopy (SEM) investigations confirmed a uniform distribution of AgNPs on the surface of NF membrane although AgNPs tend to agglomerate into nano-sized colloidal clusters. Our results showed that AgNPs had little impact on the performance of the NF membrane, including salt rejection and water permeation properties. To evaluate the antibacterial properties of nanocomposite membranes, a "time-kill" analysis, a microbiological technique for measuring the change in a population of microorganisms under the impact of a specific sample, has been used against representatives of Gram-positive and Gram-negative bacteria. Inductively coupled mass spectrometry (ICP-MS) was used to study kinetics of Ag release from modified NF membrane. Leaching rates of Ag were low that will possibly result in long-established antimicrobial and antifungal properties. The present research offers a potential for its further use as a new type of modified NF membrane mitigating biofouling.
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