Time filter

Source Type

Turov V.V.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | Prylutskyy Y.I.,Taras Shevchenko National University | Ugnivenko A.P.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | Barvinchenko V.N.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | And 3 more authors.
Low Temperature Physics | Year: 2014

The structure of hydrate cover layers of SiO2-DNA-Dox (where Dox: doxorubicin) and SiO2-DNA-Dox-C60 fullerene hybrids was studied by means of low-temperature 1H NMR spectroscopy in tetrachloromethane. The hydration properties of SiO2-DNA-Dox nanomaterials combined with fullerenes and their derivatives are extremely important for their further use as therapeutics in cancer treatment and for safety reasons. The findings reveal that the hydration properties of the hybrids differ from those of the solid DNA particulates or SiO2-DNA systems due to the existence of different types of water clusters, namely the weakly (WAW) and strongly associated water (SAW) clusters. For SAWclusters the radial distributions as well as the distributions of change in Gibbs free energy due to adsorptive interactions at the surfaces of the investigated systems were obtained. © 2014 AIP Publishing LLC.

Turov V.V.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | Chehun V.F.,R.E. Kavetsky Institute of Experimental Pathology | Barvinchenko V.N.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | Krupskaya T.V.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | And 3 more authors.
Journal of Materials Science: Materials in Medicine | Year: 2011

The effect of the anticancer drug - doxorubicin (Dox) on hydration properties of a nanocomposite material deposited on silica and modified by small amount of DNA (0.6 wt%) was studied by means of 1H NMR spectroscopy at low temperatures (in the range of 200-280 K). Signals of either weakly (WAW) or strongly (SAW) associated water, as well as water associated with electrondonor groups of the composite surface (ASW), were observed. The findings reveal that, depending on the temperature and the composition of the dispersion medium, fast molecular exchange takes place between different forms of interphase water. The presence of Dox (0.1-0.2 wt%) in the dispersion medium leads to change of the relative concentrations of different forms of water. © Springer Science+Business Media, LLC 2011.

Socol G.,Romanian National Institute for Lasers, Plasma and Radiation Physics | Gnatyuk Y.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | Stefan N.,Romanian National Institute for Lasers, Plasma and Radiation Physics | Smirnova N.,Oo Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine | And 6 more authors.
Thin Solid Films | Year: 2010

We report on pulsed laser deposition of TiO2 films on glass substrates in oxygen, methane, nitrogen and mixture of oxygen and nitrogen atmosphere. The nitrogen incorporation into TiO2 lattice was successfully achieved, as demonstrated by optical absorption and XPS measurements. The absorption edge of the N-doped TiO2 films was red-shifted up to ∼ 480 nm from 360 nm in case of undoped ones. The photocatalytic activity of TiO2 films was investigated during toxic Cr(VI) ions photoreduction to Cr(III) state in aqueous media under irradiation with visible and UV light. Under visible light irradiation, TiO2 films deposited in nitrogen atmosphere showed the highest photocatalytic activity, whereas by UV light exposure the best results were obtained for the TiO2 structures deposited in pure methane and oxygen atmosphere. © 2009 Elsevier B.V. All rights reserved.

Agency: Cordis | Branch: FP7 | Program: CP-SICA | Phase: NMP.2012.2.2-3 | Award Amount: 4.62M | Year: 2013

The overall objective is the development of new coatings for supercritical steam power plants for efficient and clean coal utilization. A significant reduction of emissions is expected by increasing efficiencies to > 50%. Currently, an efficiencies of 45% have been achieved in the last 30 years from subcritical 180 bar/540C to ultra-supercritical 300 bar/600-620C corresponding to a specific reduction of 20% of CO2 emissions. Efficiencies of 50% and more can be achieved by further raising the temperature, but conventional ferritic steels are not sufficiently oxidation resistant, since the temperature designed for operation was 550 C. From the mechanical properties perspective, ferritic steels can be used at temperatures up to 650 C and for higher temperatures austenic steels and Ni base alloys are being considered. One of the main objectives of this project is therefore to develop advanced coatings for steam environments which can resist the chemical attack of steam and fireside corrosion at temperatures higher than 620C employing materials with the required high temperature mechanical properties in particular creep strength. Ferriticmartensitic steels will be considered as substrate materials for up to 650 C whereas, austenitic steels will be explored for higher temperatures. In general higher temperatures mean higher oxidation rates, in particular when the oxidant is water vapour instead of oxygen. The introduction of carbon capture and sequestration (CCS) technologies also aiming to reduce emissions in power generation has also increased the interest in developing new material solutions able to reduce the economical and environmental penalty associated to energy production systems when CO2 is generated. For instance oxy-fuel combustion takes place in a N2 free atmosphere so oxygen is burned in near stoichiometric conditions with the fuel (pulverized carbon) producing and exhaust gases mainly composed of CO2 and H2O.

Agency: Cordis | Branch: FP7 | Program: MC-IIFR | Phase: FP7-PEOPLE-IIF-2008 | Award Amount: 15.00K | Year: 2011

Industrial sol-gel inkjet inks for printing on glass substrates for architectural applications should be developed. There is a strong worldwide market demand for individual custom made decorative glass surfaces for exterior architectural applications. One of the main challenges today in the glass industry is the adhesion and exterior durability of coatings and printings on glass. The only fully commercial route today available is screen printing inorganic inks resulting in a very limited colour range and high application cost. Inkjet printing would be an ideal technology achieving economic and flexible custom made designs. However, today inkjet printing is mainly used in graphic arts applications with limited durability. First inkjet applications using ceramic inks made out of fine grinded frits and inorganic pigments appeared on the market but seem to be inferior, difficult to use, limited in color space, print quality and very limited in ink stability. Two different routes of inkjet printing on glass should be evaluated. Specialized stable sol-gel inkjet inks with superior adhesion to glass and excellent exterior durability should be developed in close cooperation with a major inkjet printer manufacturer and an applicator. Route 1: Stable inorganic-organic hybrid inks compositions based on low-temperature UV curable silanes allowing incorporation of organic and inorganic pigments should be developed. Superior adhesion to glass and exterior durability are the main features of printings on the basis of these inks. Route 2. Purely inorganic water based stable sol-gel inkjet inks compositions based on silica, titania, alumina or mixtures of above, as matrix forming agents with inorganic pigments as colour agents shall be developed. Special attention will be paid to the development of sol-gel inks that produce colour on thermal treatment of prints, avoiding issues arising during pigments stabilization in the compositions as well as printheads blocking.

Discover hidden collaborations