Entity

Time filter

Source Type


Kostanyan A.E.,RAS Kurnakov Institute of General and Inorganic Chemistry
Journal of Chromatography A | Year: 2014

The multiple dual mode (MDM) counter-current chromatography (CCC) separation consists of a succession of two isocratic counter-current steps and is carried out in series alternating between normal phase and reversed phase operation. The performance of the MDM technique can be improved by the sample re-injection between each of the dual-mode steps. The objective of this work was to develop analytical expressions to describe the MDM CCC with periodic sample injection, which can be used to simulate these processes and select optimal operating conditions for the separation of a given feed mixture. Two possible methods of the MDM separation with periodic sample injection are considered: 1 - steady-state separation: the duration of the flow periods of the phases is kept constant for all the cycles and the steady-state regime is achieved after a certain number of cycles. 2 - non-steady-state separation with variable duration of phase elution steps. It is shown that proper selection of the duration of phase flow times allows to reach complete separation of solutes in continuous steady-state operation mode even in a low efficiency column. This mode of operation provides both high productivity and high resolution. The non-steady-state method with variable duration of phase elution steps offers several options to split a mixture into groups of compounds and/or concentrate target compounds. © 2014 Elsevier B.V. Source


Sergienko V.S.,RAS Kurnakov Institute of General and Inorganic Chemistry
Russian Journal of Inorganic Chemistry | Year: 2014

Some structural features of mononuclear octahedral rhenium(V) oxo complexes with the oxygen atoms of water molecules in trans-positions to multiply bonded oxo ligands containing monodentate or organic bi-, tri-, or tetradentate ligands are considered. © 2014 Pleiades Publishing, Ltd. Source


Sergienko V.S.,RAS Kurnakov Institute of General and Inorganic Chemistry
Russian Journal of Inorganic Chemistry | Year: 2014

Some structural features of mononuclear octahedral rhenium(V) oxo complexes with oxygen atoms of hydroxo ligands in trans-positions to multiply bonded oxo ligands are considered. The complexes contain monodentate inorganic or organic ligands or bi- and tetradentate organic ligands in the equatorial plane. © 2014 Pleiades Publishing, Ltd. Source


Sergienko V.S.,RAS Kurnakov Institute of General and Inorganic Chemistry
Russian Journal of Inorganic Chemistry | Year: 2014

Structural features of mononuclear octahedral rhenium(V) monooxo complexes with sulfur and hydrogen atoms in the trans positions to the multiply bonded oxo ligands are reviewed in the paper. © 2014 Pleiades Publishing, Ltd. Source


Yaroslavtsev A.B.,RAS Kurnakov Institute of General and Inorganic Chemistry
Nanotechnologies in Russia | Year: 2012

This review is devoted to a description of the properties of hybrid membranes composed of high-molecular cation exchangers and nanoparticles of inorganic compounds. The techniques for preparing hybrid membranes, their conductive properties under high and low humidity, the selectivity of transport processes, and the mechanical characteristics are discussed. These properties are considered on the basis of a recently developed model of the semielasticity of membrane pore walls that was proposed to explain changes in membrane ionic conductivity. In this review, this model advanced further toward an explanation of other membrane properties, including their selectivity and mechanical strength. © 2012 Pleiades Publishing, Ltd. Source

Discover hidden collaborations