ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (543)
  • Springer  (543)
  • American Chemical Society
  • American Chemical Society (ACS)
  • American Geophysical Union
  • National Academy of Sciences
  • 2015-2019  (543)
  • 1990-1994
  • 1980-1984
  • 2017  (543)
  • 2005
  • Russian Journal of Physical Chemistry A  (110)
  • 64378
  • Physics  (543)
  • Geography
  • Process Engineering, Biotechnology, Nutrition Technology
Collection
  • Articles  (543)
Source
Publisher
  • Springer  (543)
  • American Chemical Society
  • American Chemical Society (ACS)
  • American Geophysical Union
  • National Academy of Sciences
Years
  • 2015-2019  (543)
  • 1990-1994
  • 1980-1984
Year
Journal
Topic
  • 1
    facet.materialart.
    Unknown
    Composite formed upon the ultrasonication of an aqueous suspension of graphite oxide–titanium dioxide (2017)
    Springer
    Details
    Publication Date: 2017-02-11
    Description: A technique is developed for obtaining a titania–graphite oxide composite with a high surface area in which the TiO 2 particles are covered by graphite oxide. It is established that the experimental value of the composite specific surface area passes through a maximum at about 200°С, depending on the temperature of preliminary annealing in an inert atmosphere.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Molecular mechanism of the viscosity of aqueous glucose solutions (2017)
    Springer
    Details
    Publication Date: 2017-02-11
    Description: Experimental relations are obtained for the viscosity of aqueous glucose solutions in the temperature range of 10–80°C and concentration range 0.01–2.5%. It is found that the concentration dependence of fluidity is linear when the concentration is higher than a certain value and varies at different temperatures. The existence of such a dependence indicates that the mobilities of solvent and solute molecules are independent of the concentration of solutions. This assumption is used to construct a theoretical model, in which the structure of an aqueous glucose solution is presented as a combination of two weakly interacting networks formed by hydrogen bonds between water molecules and between glucose molecules. Theoretical relations are obtained using this model of network solution structure for the concentration and temperature dependence of solution viscosity. Experimental data are used to calculate the activation energies for water ( U w = 3.0 × 10 –20 J) and glucose molecules ( U g = 2.8 × 10 –20 J). It is shown that the viscosity of a solution in such a network structure is governed by the Brownian motion of solitons along the chains of hydrogen bonds. The weak interaction between networks results in the contributions to solution fluidity made by the motion of solitons in both of them being almost independent.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Enthalpy characteristics of L-proline dissolution in certain water–organic mixtures at 298.15 K (2017)
    Springer
    Details
    Publication Date: 2017-02-11
    Description: A thermochemical study of the processes of L-proline dissolution in aqueous solutions of acetonitrile, 1,4-dioxane, acetone, dimethyl sulfoxide, nitromethane and tetrahydrofuran at Т = 298.15 K in the range of organic solvent concentrations x 2 = 0–0.25 mole fractions is performed. Standard values of the enthalpies of solution and transfer of L-proline from water to mixed solvent, and the enthalpy coefficients of pairwise interactions between L-proline and molecules of organic solvents, are calculated. The effect the composition of a water–organic mixture and the structure of organic solvents have on the enthalpy characteristics of L-proline dissolution and transfer is examined. The effect the energy properties of intermolecular interactions between components of a mixed solvent has on the intermolecular interactions between L-proline and molecules of cosolvent is estimated. The correlation between the enthalpy characteristics of L-proline dissolution and electron-donor properties of organic cosolvent in aqueous solutions is determined.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    Effect of the preparation method of silver and gold nanoparticles on the photosensitizing properties of tetraphenylporphyrin–amphiphilic polymer—nanoparticle systems (2017)
    Springer
    Details
    Publication Date: 2017-02-11
    Description: The ranges of concentrations of silver and gold nanoparticles in which the rate constants of the test for the photodynamic therapy (PDT) reaction of oxidation of tryptophan in an aqueous medium in the presence of photosensitizer remain virtually the same (without nanoparticles) are found. This testifies to the feasibility of causing additional photothermal damage on tumor cells by transforming the absorbed energy of electromagnetic radiation in the area of the plasmon resonances of the administered nanoparticles into heat energy in the PDT of tumors. Metal nanoparticles are obtained by photochemical and chemical methods, and by laser ablation. Tetraphenylporphyrin solubilized with Pluronic F127 (to attain its solubility in aqueous systems), the optical absorption band of which is close to the plasmon absorption bands of nanoparticles, is used as a photosensitizer.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    Adsorption and catalytic properties of sulfated aluminum oxide modified with cobalt ions (2017)
    Springer
    Details
    Publication Date: 2017-02-11
    Description: The adsorption properties of sulfated aluminum oxide (9% SO 4 2- /γ-Al 2 O 3 ) and a cobalt-containing composite (0.5%Сo/SO 4 2- /γ-Al 2 O 3 ) based on it are studied via dynamic sorption. The adsorption isotherms of such test adsorbates as n-hydrocarbons (C 6 –C 8 ), benzene, ethylbenzene, chloroform, and diethyl ether are measured, and their isosteric heats of adsorption are calculated. It is shown that the surface sulfation of aluminum oxide substantially improves its electron-accepting properties, and so the catalytic activity of SO 4 2- /γ-Al 2 O 3 in the liquid-phase alkylation of benzene with octene-1 at temperatures of 25–120°C is one order of magnitude higher than for the initial aluminum oxide. It is established that additional modification of sulfated aluminum oxide with cobalt ions increases the activity of this catalyst by 2–4 times. It is shown that adsorption sites capable of strong specific adsorption with both donating (aromatics, diethyl ether chemosorption) and accepting molecules (chloroform) form on the surface of sulfated γ-Al 2 O 3 promoted by cobalt salt.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    Conformations and properties of O -Alkyl- S -(2- N , N -dialkylamino)-ethylmethylthiophosphonates (2017)
    Springer
    Details
    Publication Date: 2017-02-11
    Description: Conformers of the biologically active compounds CH 3 P(O)(OR)(SCH 2 CH 2 NR 2 ′ ), where ( I ) R = i -C 4 H 9 , R′ = C 2 H 5 and ( II ) R = C 2 H 5 , R′ = i -C 3 H 7 , are calculated within the AM1 level of theory. The elongated and twisted forms with maximum and minimum distances between a nitrogen atom and those of a phosphorus tetrahedron, respectively, and bearing a syn and anti oriented alkoxy group relative to a phosphoryl oxygen, are studied. It is found that the differences between the energy, electronic, and geometric parameters of these forms are apparent in differences between their properties, e.g., the ability to participate in complexation and protonation, reactions that to some extent simulate the interaction between a substance and a biological object.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Volume properties and refraction of aqueous solutions of bisadducts of light fullerene С 60 and essential amino acids lysine, threonine, and oxyproline (С 60 (C 6 H 13 N 2 O 2 ) 2 , С 60 (C 4 H 8 NO 3 ) 2 , and С 60 (C 5 H 9 NO 2 ) 2 ) at 25°C (2017)
    Springer
    Details
    Publication Date: 2017-02-20
    Description: Concentration dependences of the density of aqueous solutions of bisadducts of light fullerene С 60 and essential amino acids are studied by pycnometry. Concentration dependences of the average molar volumes and partial volumes of components (Н 2 О and corresponding bisadducts) are calculated for С 60 (C 6 H 13 N 2 O 2 ) 2 –Н 2 О, С 60 (C 4 H 8 NO 3 ) 2 –Н 2 О, and С 60 (C 5 H 9 NO 2 ) 2 –Н 2 О binary systems at 25°C. Concentration dependences of the indices of refraction of С 60 (C 6 H 13 N 2 O 2 ) 2 –Н 2 О, С 60 (C 4 H 8 NO 3 ) 2 –Н 2 О, and С 60 (C 5 H 9 NO 2 ) 2 –Н 2 О binary systems are determined at 25°C. The concentration dependences of specific refraction and molar refraction of bisadducts and aqueous solutions of them are calculated.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Heat capacity and thermodynamic functions of new cobalt manganites NdM 2 I CoMnO 5 (M I = Li, Na, and K) in the range of 298.15–673 K (2017)
    Springer
    Details
    Publication Date: 2017-02-20
    Description: Temperature dependences of the heat capacity of cobalt manganites NdM 2 I CoMnO 5 (M I = Li, Na, and K) are studied by means of dynamic calorimetry in the range of 298.15−673 K. It is found that λ-shaped effects are observed on the C p ° ~ f ( T ) curve of cobalt manganites, due probably to second order phase transitions. Based on the experimental data, equations for the temperature dependences of the heat capacity of cobalt manganite are derived with allowance for the temperatures of phase transitions. The values of thermodynamic functions Н °( T )– Н °(298.15), S °( T ), and Ф хх ( T ) are calculated.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Kinetic tendencies of thermal transformations in nanosized Ni–MoO 3 systems (2017)
    Springer
    Details
    Publication Date: 2017-02-20
    Description: The transformations in nanosized Ni–MoO 3 systems were studied by optical spectroscopy, microscopy, and gravimetry depending on the thickness of the Ni ( d = 1–40 nm) and MoO 3 ( d = 3–50 nm) films, temperature (473–773 K), and thermal treatment time. The contact potential difference was measured for Ni and MoO3 films; photovoltage, for Ni–MoO 3 systems. An energy band diagram of the Ni–MoO 3 systems was constructed. A model of the thermal transformation of MoO 3 films in Ni–MoO 3 systems was suggested, which involves a redistribution of equilibrium charge carriers at the contact, formation of a [(V а ) ++ е] center during the preparation of the MoO 3 film, the transformation of this center into an [е(V а ) ++ е] center during the formation of Ni–MoO 3 systems, and the thermal transition of an electron to the level of the [(V а ) ++ е] center to form an [е(V а ) ++ е] center.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Application of silica-supported Fe–Cu nanoparticles in the selective hydrogenation of p -dinitrobenzene to p -phenylenediamine (2017)
    Springer
    Details
    Publication Date: 2017-02-20
    Description: Supported bimetallic Fe–Cu/SiO 2 materials are synthesized, and their catalytic activity in hydrogenation of dinitrobenzene to phenylenediamine at 145–180°С and 1.3 MPa hydrogen pressure is studied for the first time. The best results (89% selectivity toward p -phenylenediamine at complete conversion of p -dinitrobenzene) are obtained for the sample synthesized via co-deposition with subsequent calcination at 300°С. The sample contains 7% iron and 3% copper. The formation of separate phases of metal oxides (for the catalysts prepared by impregnation) and mixed bimetallic oxide phases (in case of co-deposition procedure) in calcined samples is revealed via thermoprogrammed reduction with hydrogen.
    Print ISSN: 0036-0244
    Electronic ISSN: 1531-863X
    Topics: Chemistry and Pharmacology , Physics
    Published by Springer on behalf of MAIK Nauka/Interperiodica.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...