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Electrospinning of polyhydroxyalkanoate fibrous scaffolds: effects on electrospinning parameters on structure and properties / T. . Volova [et al.] // J. Biomater. Sci.-Polym. Ed. - 2014. - Vol. 25, Is. 4. - P. 370-393, DOI 10.1080/09205063.2013.862400. - 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. . - ISSN 0920-5063. - ISSN 1568-5624

РУБ Engineering, Biomedical + Materials Science, Biomaterials + Polymer Science
Рубрики:
TISSUE ENGINEERING APPLICATIONS
   FIBER MATS
   POLY 3-HYDROXYBUTYRATE
   POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYVALERATE)
   BIOCOMPATIBILITY
   PROLIFERATION
   FABRICATION
   NANOFIBERS
   COPOLYMERS
   MEMBRANES
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Krasnoyarsk 660041, Russia
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, RussiaИФ СО РАН;

Доп.точки доступа:
Volova, T.; Волова, Татьяна Григорьевна; Goncharov, D.; Sukovatyi, A. G.; Суковатый, Алексей Григорьевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Nikolaeva, E.; Shishatskaya, E.; 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]
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Dielectric properties of liquid crystals in polycapillary matrices / B. A. Belyaev [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 6. - P. 1315-1322, DOI 10.1134/S1063783410060314. - 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). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[Belyaev, B. A.
Drokin, N. A.
Shabanov, V. F.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kumakhov, M. A.] Inst Xray Opt, Moscow 125315, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Institute of X-Ray Optics, ul. Chasovaya 28, Moscow 125315, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Kumakhov, M. A.; Shabanov, V. F.; Шабанов, Василий Филиппович
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AVERYANOV, E. M.
POLARIZED LUMINESCENCE SPECTRUM OF IMPURITY LIQUID-CRYSTAL - THE DEGENERATION LIFTED AND RENEWED BY RELAXATION / E. M. AVERYANOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 103, Is. 6. - P. 2018-2038. - Cited References: 45 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
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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