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«Nanotechnology Research and Practice» – international scientific Journal.

E-ISSN 2413-7227

Publication frequency – once a year.
Issued from 2014.

1 March 31, 2015

1. Behtouei Mostafa, Maleki Sheikh Abadi Amin, Ebrahim Heidari Samiromi
Effects of the Rashba and the Dresselhaus Spin-orbit Interactions on the Quantum Transport and Spin Filtering in a Three-terminal Quantum Ring

Nanotechnology Research and Practice, 2015, Vol.(5), Is. 1, pp. 4-12.
DOI: 10.13187/ejnr.2015.5.4CrossRef

The spin resolved conductance in a quantum ring with one input and two output leads in the presence of the Rashba spin-orbit interaction (RSOI) and the Dresselhaus spin-orbit interaction (DSOI) has been studied. The conditions needed for perfect spin polarization including the value of the Rashba and Dresselhaus coupling strength and the values of the electron energy are investigated coupled strongly with the leads. Our calculations are performed using the non-equilibrium Green’s function method and Griffith boundary condition in the framework of the tight binding model. It is shown that the spin-polarized transport and polarizability can be controlled by the RSOI and/or DSOI in the effects of applied magnetic field treading the ring, but also on the bias applied between the input and output leads. Results of this paper can be used in designing perfect spin inverters. The effects of relative positions of the drain electrodes on the perfect spin polarization are also investigated.

URL: http://ejournal13.com/journals_n/1427883028.pdf
Number of views: 2192      Download in PDF

2. Farshad Farahbod, Ahmad reza Mohammadi
The Experimental Investigation of Production of Formaldehyde

Nanotechnology Research and Practice, 2015, Vol.(5), Is. 1, pp. 13-22.
DOI: 10.13187/ejnr.2015.5.13CrossRef

In this research, a comparison between the performance efficiency of silver catalytic water based reactor in nano and micro scale of catalyst is performed. Process simulation is done to find the dominant parameters in production of formaldehyde from methanol. Mass and energy conservation equations in cylindrical silver catalytic bed are written and solved simultaneously. The bed is discrete in triangular elements in both horizontal and radial dimensions. Conservation equations are solved simultaneously in each element for both micro and nano scale. Due to experiments, the optimum amounts of water to methanol and oxygen to methanol is 1 and 0.3, respectively. The product with 0.48 mol% formaldehyde is obtained using the optimum amount of 1 for water to methanol in feed in catalytic bed.

URL: http://ejournal13.com/journals_n/1427883460.pdf
Number of views: 2101      Download in PDF

3. Ignat Ignatov, Oleg Mosin
The Mathematical Model of Interaction of Carbonaceous Fullerene Containing Mineral Shungate and Microporous Crystalline Aluminosilicate Mineral Zeolite with Water

Nanotechnology Research and Practice, 2015, Vol.(5), Is. 1, pp. 23-36.
DOI: 10.13187/ejnr.2015.5.23CrossRef

We studied the composition and structural properties of the amorphous, uncrystallized, fullerene analogous, carbon containing natural mineral shungite from Zazhoginskoe deposit in Karelia (Russian Federation) and the microporous crystalline aluminosilicate mineral zeolite (Most, Bulgaria) for evaluation of the mathematical model of interaction of these minerals with water. There are submitted data about the nanostructure, obtained with using of transmission electron microscopy (TEM-method), IR-spectroscopy (NES and DNES-method), as well as composition and physical chemical properties of these minerals. For evaluation of the mathematical model of interaction of these minerals with water, the methods of non-equilibrium spectrum (NES) and differential non-equilibrium spectrum (DNES) of water were applied. The average energy (∆EH... O) of hydrogen Н…O-bonds among individual molecules H2O after treatment of shungite and zeolite with water was measured at -0,1137 eV for shungite and -0,1174 eV for zeolite. The calculation of ∆EH... O for shungite with using DNES method compiles +0,0025±0,0011 eV and for zeolite -1,2±0,0011 eV. This result suggests the restructuring of ∆EH...O values among the individual H2O molecules in the samples, with a statistically reliable increase of local maximums in DNES-spectra.

URL: http://ejournal13.com/journals_n/1427883575.pdf
Number of views: 2124      Download in PDF

4. Ignat Ignatov, Oleg Mosin
Structural Mathematical Models of Water Clusters Regarding the Energy of Hydrogen Bonding

Nanotechnology Research and Practice, 2015, Vol.(5), Is. 1, pp. 37-56.
DOI: 10.13187/ejnr.2015.5.37CrossRef

In this review it is reported about the research on the structure of intermolecular water cyclic associates (clusters) with general formula (Н2О)n and their charged ionic clusters [(Н2О)n]+ and [(Н2О)n]- by means of computer modeling and spectroscopy methods as 1Н-NMR, IR-spectroscopy, DNES, EXAFS-spectroscopy, X-Ray and neurons diffraction. The computer calculation of polyhedral nanoclusters (Н2О)n, where n = 3–20 are carried out. Based on this data the main structural mathematical models describing water structure (quasicrystalline, continious, fractal, fractal-clathrate) have been examined and some important physical characteristics were obtained. The average energy of hydrogen bonding (EH…O) between Н2О molecules in the process of cluster formation was measured by the DNES method compiles –0,1067±0,0011 eV. It was also shown that water clusters formed from 2H2О were more stable, than those ones from Н2О due to isotopic effects of deuterium.

URL: http://ejournal13.com/journals_n/1427883648.pdf
Number of views: 1759      Download in PDF

full number
URL: http://ejournal13.com/journals_n/1427883745.pdf
Number of views: 2169      Download in PDF

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