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Publications on the project |
053 Flexible silk–inorganic nanocomposites: from transparent to highly reflective |
Authors: | Kharlampieva E., Kozlovskaya V., Gunavidjaja R., Shevchenko V., Vaja R., Naik R., Kaplan D.L., Tsukruk V.V. | |
Summary: | A novel type of all-natural, biocompatible, and very robust nanoscale free-standing biohybrids are reported. They are obtained by integrating a silk fibroin matrix with functional inorganic nanoplatelets using a spin-assisted layer-by-layer assembly. The organized assembly of the silk fibroin with clay (montmorillonite) nanosheets results in highly transparent nanoscale films with significantly enhanced mechanical properties, including strength, toughness, and elastic modulus, as compared to those for the pristine silk nanomaterials. Moreover, replacing clay nanoplatelets with a highly reflective Langmuir monolayer of densely packed silver nanoplates causes a similar enhancement of the mechanical properties, but in contrast to the materials above, highly reflective, mirror-like, nanoscale flexible films are created. This strategy offers a new perspective for the fabrication of robust all-natural flexible nanocomposites with exceptional mechanical properties important for biomedical applications, such as reinforced tissue engineering. On the other hand, the ability to convert silk-based nanoscale films into mirror-like biocompatible flexible films can be intriguing for prospective photonics and optical exploitation of these nanobiohybrids. | |
Keywords: | Hybrid materials, composites, nanostructures, thin films, flexible electronics, biomedical applications | |
Edition: | Adv. Funct. Mater. | | | 2010,
840-846,English |
053 Synthesis of ioncontaining polyetherurethanes with heightened content of silicon by sol-gel method |
Authors: | ShevchukA.V., Gumennaya M.A., KlimenkoN.S., Fomenko A.O., RudakovV.M. | |
Summary: | The ion containing poly(ether urethane)s (POSS-PEU-Si) with heightened content of silicon based on POSS-M are synthesized by sol-gel method with the aim of obtaining the film materials with ionic conductivity. The dependence of structure and properties of that polymers on the nature of incorporated ionogenic fragments are established. | |
Keywords: | sol-gel process, ionogenic poly(ether urethane)s, heightened content of silicon, structure | |
Edition: | Polymer J. | | | 2011,
248-251,Russian |
053 Synthesis of multifunctional sulfonate derivatives of polyhedral oligomeric silsesquioxanes — proton-donating dopants for polymer electrolytes |
Authors: | ShevchenkoV.V., Bliznyuk V.N., Stryutskii A.V., ShevchukA.V., Klimenko N.S. | |
Summary: | The multifunctional organic-inorganic proton-donating compounds which are sulfonate and aminosulfonate derivatives of octahedral olygomeric silsesquioxanes have been synthesized as dopants of polymer proton-exchange membranes for polymer electrolyte fuel cells. Those compounds are obtained by the interaction of aminocontaining octahedral oligomeric silsesquioxane with 2-sulfobenzoic acid anhydride. The structure of synthesized dopants is investigated by the methods of IR and 1H NMR spectroscopy. | |
Keywords: | | |
Edition: | Reports of the National Academy of Sciences of Ukraine | | | 2012,
158-163,Russian |
053 System urethanecontaining organic-inorganic polymer - xanthene dye, obtained by sol-gel method |
Authors: | Dorokhin A.V., Strutsky A.V., Klymenko N.S., Babich I.V., Gomza Yu.P., Shevchenko V.V. | |
Summary: | The organic-inorganic hybrid film materials are obtained by acid-catalyzed sol-gel synthesis. The oligooxyethyleneurethaneurea α,ω-dialkoxysilyl oligomer was used as film-forming alkoxysilyl precursor. The dyes of xanthene line: Rhodamine 6G and its derivatives were used as the dopants. The structure and optical properties of obtained materials were investigated. Inclusion of the the dyes to composition of organic-inorganic materials does not considerably change their spectral luminescent characteristics. | |
Keywords: | Rhodamine 6G, polymer-dye systems, hybrid organic-inorganic polyuretrhaneureas, sol-gel | |
Edition: | Polymer J. | | | 2012,
432-436,Russian |
053 Synthesis of amphiphilic systems of polyhedral oligomeric silsesquioxanes with phenolic azo dye Disperse yellow 7 |
Authors: | Shevchenko V.V., Dorokhin A.V., Choi I., Stryutskii A.V., Klimenko N.S., Tsukruk V.V. | |
Summary: | The approach to the synthesis of functionalized hydrophilic-hydrophobic chromophore-containing polyhedral oligomeric silsesquioxanes (POSS), the amphiphilicity of which is created by combination in the organic part of the silsesquioxane core of chromophores of the hydrophilic or hydrophobic nature with, correspondingly, hydrophobic and hydrophilic oligomeric compound, is described. The first specimen of such type of amphiphilic POSS is synthesized. Its hydrophobic part is the azodye Disperse yellow 7, and the hydrophilic one is oligoethyleneoxide. The possibility of functionalization of the oligomeric part to get new properties is shown. | |
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Edition: | Reports of the National Academy of Sciences of U kraine | | | 2013,
143-149,Russian |
053 Polyedral oligomeric silsesguioxanes with contain oligomeric block with terminal ionic groups in organic shell |
Authors: | Shevchuk A.V., Klimenko N.S., Gumenna M.A., Vakuliuk P.V., Shevchenko V.V. | |
Summary: | The segmented ionic oligoetherurethunesilsesguioxanes (POSS-OU) of branched structure on the base of the mixture of polyhedral oligomeric silsesguioxanes (POSS-M) were synthesized. These compounds have as organic shell of oligoethersilsesguioxane nuclear oligoetherurethane and oligoetherurethanurea fragments with the terminal ionic groups. The structure and physico-chemical properties of recived compounds were studies. | |
Keywords: | functionalization, oligoethersilsesguioxanes, ionic conductivity | |
Edition: | Polymer J. | | | 2013,
95-100,Russian |
053 Assembly of the anisotropic microcapsules in agueous dispersions |
Authors: | Lisunova M., Dorokhin A., Holland N., Shevchenko V., Tsukruk V. | |
Summary: | The assembly of cubic hollow microcapsules in an aqueous buffer solution had been studied in comparison with the traditional spherical microcapsules with both microcapsules assembled from identical components and having identical surface charges. We observed that the cubic microcapsules mainly form the highly compacted “boxed” clusters with a number of microcubes controlled by ionic strengths in a sharp contrast to the spherical microcapsules for which the random branched chain structures are generally favored. The assembled spherical microcapsules create a large number of openings with extensive internal surface areas while the cubic microcapsules build close, compacted aggregates with densely packed units. The dimensions of the “boxed” clusters from similarly charged cubic microcapsules are greatly stabilized by strong facet-to-facet interactions and can be tuned in a wide range by changing ionic strength. The chain spherical microcapsules are mobile and capable of reconfiguration due to the lower hydrophobic energy of attraction in contrast to compact, stable aggregates of cubic microcapsules. The dramatic differences in assembly of microcapsules with similar nature but different shapes point that the aggregation behavior in such dispersions might be dominated by shape geometry and alternation of facet-to-facet interactions. | |
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Edition: | Soft Matter | | | 2013,
3651-3660,English |
053 Star-shaped molecules with poss core and azobenzene dye arms |
Authors: | Ledin P.A., Tkachenko I.М., Xu W., Choi I., Shevchenko V.V., Tsukruk V.V. | |
Summary: | We synthesized a series of hybrid nanomaterials combining organic dyes with polyhedral oligomeric silsesquioxanes (POSS) based on three different azobenzenes: monoazobenzene (4-phenylazophenol), bis-azobenzene (Disperse Yellow 7 and Fast Garnet derivative), and push–pull azobenzene (Disperse Red 1) via hydrosilylation coupling. The azo-functionalized POSS compounds possess high thermal stability, and their branched architecture resulted in effective suppression of molecular aggregation and allowed for direct imaging of individual dye–POSS structures with expected molecular dimensions. Stable, uniform, smooth, and ultrathin nanocomposite films with mixed silica–organic composition and relatively low refractive indices can be fabricated from all azo–POSS branched conjugates. Finally, the photoisomerization behavior of POSS-conjugated 4-phenylazophenol was investigated in solution as well as in ultrathin nanocomposite film. We found that conjugation to POSS core did not affect the kinetics of trans–cis photoisomerization and thermal cis–trans relaxation. Furthermore, rapid and reversible photoisomerization was observed in azo–POSS nanocomposite films. We suggest that the highly stable branched azo–POSS conjugates with high dye grafting density described here can be considered for nanometer-sized photoswitches, active layer material with optical-limiting properties, and a medium with photoinduced anisotropy for optical storage. | |
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Edition: | Langmuir | | | 2014,
8856-8865,English |
053 The sol-gel synthesis and properties of organic-inorganic polyetherurethanes with covalently bound xanthene dyes |
Authors: | Dorokhin A.V., Stryutsii A.V., Gomza Yu.P., Babich I.V., Klimenko N.S., Shevchenko V.V. | |
Summary: | The derivatives of dye Rhodamine 6G which are capable of sol-gel conversion were synthesized. The sol-gel synthesis of organic-inorganic polyetherurethaneureas with covalent binding of these dyes to the inorganic component was developed. The structure and optical properties of these materials were investigated. It was established that covalent binding of dyes does not change both the characteristics of the space-ordered structure of the polymeric matrix material and the position of the absorption maxima in the visible range at a certain intensity enhancing absorption of the latter. | |
Keywords: | Rhodamine 6G, Rhodamine 6G threealkoxysilane derivatives, organic-inorganic poly(etherurethane urea)s, sol-gel, structure, optic properties | |
Edition: | Polymer J. | | | 2014,
188-192,Russian |
The events in the framework of the project |
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053 2.3. Chemistry and physics of surface phenomena. Supramolecular structure Purpose:Development of methods for the synthesis of functionalized nanoparticles based on reactive polyhedral compounds, creation of organic-inorganic nanohybrides on the basis of that compounds and establishment of fundamental laws of influence of nano heterogeneous structure of the components on their structure and functional properties Expected results:Release of new product: material Stage 1:Synthesis and study of properties of reactive nanoparticles based on polyhedral oligosilsesquioxanes Stage 2:Development of methods for functionalizing the reactive nanoparticles based on polyhedral compounds. Synthesis and properties of organic-inorganic nanohybrides based on them Stage 3:Synthesis and research of structure and properties of nanohybrides based on polyhedral oligosilsesquioxanes of different morphology Stage 4:Synthesis of nano hybrids based on POSS using sol-gel method. Study of structure features of reticular and sol-gel nanohybrides Stage 5:Study of influence of structural organization and nature of components on properties of hybrid nanomaterials
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