Chernozatonskii L.A.,RAS Emanuel Institute of Biochemical Physics |
Sorokin P.B.,RAS Emanuel Institute of Biochemical Physics
Journal of Physical Chemistry C | Year: 2010
It is shown that the lines of adsorbed hydrogen pair atoms divide a graphene sheet into electronically independent strips and form an electron waveguide or 2H-line graphene-based superlattice (2HG-SL). We investigated the electronic properties of such structures in detail. The electronic spectra of a "zigzag" (n, 0)- 2HG-SL are similar to those of armchair graphene ribbons and have similar oscillation of the band gap with the width between adjacent 2H-lines (number n). The induced strain with the direction perpendicular to the hydrogen pair "lines" significantly changes the electronic properties of the investigated structures. For example, in the case of the 2HG-SL (3n, 0) (n > 2) we observed the semiconductor-metal transition. Superlattices of the (n, n) type with a "staircase" of adsorbed pairs of H atoms are semiconductors with nearly linear decreasing of the band gap with increasing n. We found that the configuration with the opposite spin (antiferromagnetic) orientation between ferromagnetically ordered edge states of the (n, n) 2HG-SL is energy favorable. We also suggested an experimental way of fabricating these superlattices. Finally, we discussed properties of possible hydrogen lined waveguide junctions. © 2010 American Chemical Society.
Kvashnin A.G.,Rice University |
Kvashnin A.G.,Moscow Institute of Physics and Technology |
Chernozatonskii L.A.,RAS Emanuel Institute of Biochemical Physics |
Yakobson B.I.,Rice University |
Sorokin P.B.,National University of Science and Technology "MISIS"
Nano Letters | Year: 2014
We explore how a few-layer graphene can undergo phase transformation into thin diamond film under reduced or no pressure, if the process is facilitated by hydrogenation of the surfaces. Such a "chemically induced phase transition" is inherently nanoscale phenomenon, when the surface conditions directly affect thermodynamics, and the transition pressure depends greatly on film thickness. For the first time we obtain, by ab initio computations of the Gibbs free energy, a phase diagram (P, T, h) of quasi-two-dimensional carbon-diamond film versus multilayered graphene. It describes accurately the role of film thickness h and shows the feasibility of creating novel quasi-two-dimensional materials. Further, the role of finite diameter of graphene flakes and possible formation of the diamond films with the (110) surface are described as well. © 2014 American Chemical Society.
Balagurov B.Y.,RAS Emanuel Institute of Biochemical Physics
Journal of Experimental and Theoretical Physics | Year: 2014
The conductivity of composites in the presence of a magnetic field H is considered. The galvanomagnetic characteristics for a weakly inhomogeneous medium are determined in explicit form in an approximation quadratic in the deviations of conductivity tensor \hat \sigma (r) from its mean value \hat \sigma. The contribution to the effective conductivity tensor linear in concentration c of inclusions for a composite with a small value of c is expressed in terms of the dipole polarizability of an individual inclusion, which is defined in the transformed system in which it is surrounded by an isotropic matrix with a scalar conductivity. Transition to this system is performed using a symmetry transformation that does not change the dc equations. An approximate approach proposed for describing the galvanomagnetic properties of composites in the wide range of parameters appearing in the problem generalizes the standard theory of an effective medium to the case of anisotropic systems with inclusions of arbitrary shape in field H0. © 2014 Pleiades Publishing, Inc.
Tsaplev Yu.B.,RAS Emanuel Institute of Biochemical Physics
Journal of Analytical Chemistry | Year: 2012
An overview of literature on the procedures for the chemiluminescence determination of hydrogen peroxide is presented. © 2012 Pleiades Publishing, Inc.
Balagurov B.Ya.,RAS Emanuel Institute of Biochemical Physics
Journal of Experimental and Theoretical Physics | Year: 2013
A transformation of the coordinates, current density, and electric field strength has been proposed such that holds the direct-current equations. One of the components of a composite can be made isotropic by choosing the coefficients of the transformation. This allows the generalization of the standard theory of the effective medium to the case of an anisotropic composite with inclusions of an arbitrary shape. © 2013 Pleiades Publishing, Inc.
Tatikolov A.S.,RAS Emanuel Institute of Biochemical Physics
Journal of Photochemistry and Photobiology C: Photochemistry Reviews | Year: 2012
It is known that polymethine dyes (PD) can form complexes with biomacromolecules, in which, as a rule, fluorescence buildup is observed. In addition, PD possess a unique property to form ordered aggregates of different types (dimers, H- and J-aggregates) both in the free state and on biomacromolecules as templates. This creates a basis for application of PD as spectral-fluorescent probes for biomacromolecules, which is a matter of this review. Besides, the review is devoted to studies of noncovalent interactions of PD with biomacromolecules: nucleic acids, proteins, and some others. © 2011 Elsevier B.V.
Nikolaev E.N.,RAS Emanuel Institute of Biochemical Physics |
Kostyukevich Y.I.,Moscow Institute of Physics and Technology |
Vladimirov G.N.,RAS Institute of Problems of Chemical Physics
Mass Spectrometry Reviews | Year: 2016
Fourier transform ion cyclotron resonance (FT ICR) mass spectrometer offers highest resolving power and mass accuracy among all types of mass spectrometers. Its unique analytical characteristics made FT ICR important tool for proteomics, metabolomics, petroleomics, and investigation of complex mixtures. Signal acquisition in FT ICR MS takes long time (up to minutes). During this time ion-ion interaction considerably affects ion motion and result in decreasing of the resolving power. Understanding of those effects required complicated theory and supercomputer simulations but culminated in the invention of the ion trap with dynamic harmonization which demonstrated the highest resolving power ever achieved. In this review we summarize latest achievements in theory and simulation of FT ICR mass spectrometers. © 2014 Wiley Periodicals, Inc.
Sorokin P.B.,RAS Emanuel Institute of Biochemical Physics |
Chernozatonskii L.A.,RAS Emanuel Institute of Biochemical Physics
Physics-Uspekhi | Year: 2013
One of the current priorities in the physics and chemistry of graphene is the study of its semiconducting derivatives. This review summarizes the state of the art in this area of research. The structure and electronic properties of materials as such graphene ribbons, partially hydrogenated and fluorinated graphene, graphane, fluorographene, and diamane are discussed in detail. © 2013 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.
RAS Emanuel Institute of Biochemical Physics | Date: 2011-03-23
The invention relates to an agent for increasing the octane number of a gasoline automobile fuel, which agent is a combination of alcohol and a product of reaction between a carbonyl compound and a compound containing at least two hydroxyl groups allowing the formation of cycles with carbonyl compounds, or is the mixtures of the above mentioned products. In a preferred embodiment, mono- or oligosaccharides or diatomic, triatomic or polyatomic alcohols are used as the compounds containing at least two hydroxyl groups allowing the formation of cycles with carbonyl compounds. Pentoses, preferably xylose or arabinose or hexose, substantially glucose, and the mixtures thereof are used as the monosaccharides. Glycols, for example, ethylene glycol are used as diatomic alcohols, glycerin is used as triatomic alcohols and erythritols, for example, pentaerythritol are used as polyatomic alcohols. A compound relating to lower aldehydes or lower ketones, for example, formaldehyde, acetaldehyde, acetone, methylethylketone, diethylketone or cyclohexane, is used as a carbonyl compound. The alcohols correspond to aliphatic alcohols containing up to five carbon atoms, preferably ethanol. The inventive gasoline automobile fuel means a gasoline or an alcohol-gasoline composition.
RAS Emanuel Institute of Biochemical Physics | Date: 2010-09-01
The invention concerns the methods for producing polymeric coatings on particle surfaces and can be used in pharmacology, medicine, veterinary and cosmetology to create the systems of vector delivery of drugs and biologically active agents as well as in other fields applying the particles with thin-layer polymer coatings. The method enables to obtain biocompatible, particularly polyamide and polyimide coatings on inorganic particles including magnetic inorganic nanoparticles. The method for producing polymeric coatings on particles surface comprises (a) forming a reaction system containing the particles mixed with monomers, and (b) the subsequent carrying out of polymerization reaction to form the polymeric coating on the particles; wherein the said polymerization reaction is accomplished by irradiating the reaction system with electromagnetic radiation, particularly, with microwaves capable of being absorbed partially or totally by the said particles.