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Magnetic mesoporous silica nanoparticles with small and uniform pore size have been extensively researched owning to its biological functionalization and unique magnetic properties. In the paper, core-shell structural Fe3O4@SiO2 magnetic mesoporous nanoparticles were successfully prepared by a sol-gel homogeneous coprecipitation process, using Fe3O4 as core, cetyltrimethylammonium bromide as surfactant,...
The problem of transfer of polymers through nanopores in porous materials as dielectric low k materials. To study this problem we used the comb model. It is shown that the new equation of fractional order must be used to describe this problem. The solutions of these fractional order equations have obtained. The numerical analysis has been performed. The obtained results have been applied to study...
We have studied the hydrogenation of small, medium sized carbon based nanoclusters. Density functional theory was used to calculate the energy and atomic forces. The average hydrogen binding energy for a hydrogen binding as an atom is calculated for all clusters.
We present the results of density functional calculations to understand the stability and magnetic phase separation of LiFePO4. The most stable ground state of the LixFePO4 compound is investigated using the first-principles and molecular dynamics (MD) methods within the framework of density functional approach.
Nonlinear optical crystals are very important for laser frequency conversion. Potassium dihydrogen phosphate (KDP) is suitable for higher harmonic generation of huge laser systems for fusion experiments because it can be grown to larger sizes and also KDP has a high laser damage threshold. It has high optical nonlinearity, large temperature and angular allowance and it is non hygroscopic and mechanically...
A graphene/NiO and graphene/NiO-MnO2 nano-composites were prepared by simple chemical precipitation followed by thermal annealing and using a chelating agent and Ni and Mn hydroxides on graphene. The graphene/NiO-MnO2 was pretreated by ultrasonication followed by thermal annealing at 300°C for 2 h. Graphene/MoO2-MoS2 composites were prepared by a hydrothermal reaction of molybdenum(IV) oxide with...
The corona resistant property of polyimide (PI) composite films is a very important parameter in the application of electrical insulation materials. The reports show that the ultraviolet (UV) ray in the corona process always destroy the PI. In this background, a novel method using SiO2-coated TiO2 (TiO2@SiO2) particle as dopant in PI has been proposed and the composite films with different content...
Isothermal compression of spray formed superalloy GH742y has been conducted on Gleebe−1500D hot simulation at the deformation temperatures ranging from 930°C to 1020°C where the strain rates have ranged from 0.01s−1 to 10s−1, and the height reduction of 50%. The effect of deformation temperatures and strain rates on the flow stress was analyzed with the true stress-true strain curve, and the hot deformation...
The characteristics of electrical breakdown in inorganic nano-Silica/Epoxy composites are studied. Nano Silica shows significant impact on electrical breakdown strength of nano-Silica/Epoxy composites. Appropriate proportion of inorganic nano Silica can improve the breakdown strength of the composites, but excessive fillers show opposite effect. The percolation and interfacial characteristics are...
The roles of graphene in shape memory polyurethane nanocomposite (SMPUN) as a reinforcing filler, as a fixed structure for memorizing a specified original shape, and as a conductive filler to actuate shape recovery by resistive heating, were examined. The effectiveness of each role was modulated by functionalizing graphene with a hydroxyl group through oxidation with H2O2. The reinforcing effect of...
Based on uniform design method, correlations between five flux components and Sn-9Zn/Cu wetting were studied. Take lauric acid, propylene glycol, decanol, polyethylene glycol 2000 and zinc chloride as independent variables Xi, wetting spreading area as function Y in the experiment. Every variable is divided into fifteen levels. Using computer software UST4.0, the experimental data were gradually statistical...
The study is about the interfacial intermetallic compounds (IMC) microscopic changes and nickel plating consumption on SAC305/Ni soldering joints (with four solder diameters: 200, 300, 400, 500µm) before and after isothermal aging at 160°C by scanning electron microscopy (SEM). The results indicated that the IMC are mainly the (Cu, Ni)6Sn5 of SAC305/Ni soldering joints after reflow. After aging, the...
Soils contain many kinds of inorganic and organic particles, nanoparticles. In addition, natural nanoparticles could strongly influence on solubility, transport, degradation and bioavailability of environmental pollution. The present article deals with the extraction and characterization of nanoparticles in soil. Nanoparticles were extracted from 5 soil samples in different regions of Ulaanbaatar...
Polyurethanes modified by multi-walled carbon nanotube (PU/MWCNT) composites were prepared, polyurethanes as pre-polymer and MWCNT as a modifier. MWCNT was treated with a different method of situ polymerization, moreover; the structure and mechanical properties of the treated MWCT and PU/MWCNT nano-composites were investigated by microstructure analysis and performance testing, including solubility...
Human calcitonin (HCT) is a thyroid polypeptide hormone that has 32 amino acid residues. The HCT is well known for an amyloid forming peptide and its inhibition of bone mineralization of calcium-phosphorous as osteoporosis. The HCT peptide aggregates to form insoluble fibril toward diseases. In the fibril formation of HCT, the local conformation changes from an α-helix in a monomeric HCT to a beta-sheet...
Bovine β-Lactoglobulin (β-Lg) is one of the major proteins in the whey of cow milk. In the present study, the aggregation kinetic for β-Lg dispersion at different pH environment was investigated using UV-Vis spectroscopy. The kinetic's parameter of an aggregation process was observed at acidic pH and explained the late aggregation at neutral pH using computational method.
In present work, the nanosized silica particles were synthesized using acidic hydrolysis of sodium silicate by precipitation under controlled pH conditions. The synthesized nanosized silica particles were characterized by using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and X-ray diffraction (XRD). The nanosized silica particles have been demonstrated the various properties...
Currently layered composites with intermetallic interlayers are promising materials for many industries. Materials of this type involve composites consisting of titanium and titanium aluminides layers. One of the methods of such composites fabrication is explosive welding and annealing. In this paper the structure and properties of explosively welded multilayered composites is described. Structural...
At presently there are five operating power plants in the central energy system of Mongolia which generate both heat and electricity. Together these burn about 5–6 million tonnes of coal resulting in more than 600,000 tonnes of coal combustion by-products per year. Three thermal power plants are located in Ulaanbaatar city and produce more than 80% of the total electricity in Mongolia. Within these...
In Mongolia coal fired thermal power stations are producing over 90% of the country's electricity. The 4th thermal power station uses Baganuur and Shivee-ovoo coals for firing and annually disposes over 300 thousand tonnes of coal firing by-products such as fly ash. However, in Mongolia utilisation rate of the coal firing by product is negligible and seems to be caused little knowledge of the mineralogical...
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