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The purpose of this study was to investigate the thermo-mechanical and fracture behavior of uncoated and coated granite powder reinforced 1050 aluminum alloys composite for hydro-turbine blade material. Granite powder reinforced aluminum alloy was fabricated by the stir casting technique with four different weight percentages (0 wt.%, 2 wt.%, 4 wt.% and 6 wt.% granite powder). As hydro-turbine blades...
Silylation of non-terminal double bonds of unsaturated fatty acids with reactive organosilicons was successfully accomplished using the ‘Ene’ reaction route. The ‘Ene’ reaction, which is a subset of the famous Diels Alder reaction, enables grafting of vinyl silanes onto unsaturated organic molecules irrespective of the position of the double bond. This procedure was used to graft vinyltrialkoxysilanes...
In this work, we propose for the first time statistical driving current and input capacitance model of MOSFET for high speed CMOS circuit applications. The proposed model is based on Berkeley Short-channel IGFET Model BSIM4v4.7. Rather than considering few parameters variations our algorithm considers all process parameters and environment parameters variations. The accuracy of the model was verified...
Blend membranes of synthesized polyurethane (PU) based on toluene diisocyanate (TDI), polydimethylsiloxane (PDMS) and polytetramethylene glycol (PTMG) with polyamide 12-b- polytetramethylene glycol (PA12-b-PTMG) were prepared by a solution casting technique. The heterogeneous microstructures of the blend membranes (PU /PA12-b-PTMG) were characterized by Fourier transform infrared spectroscopy (FT-IR),...
The nature of polymer/POSS interactions and associated thermo-mechanical properties are discussed, and found to be consistent with small-molecule interactions associated with POSS, rather than a bottom-up self-assembly or any other method of classical reinforcement. Hansen solubility parameters are shown to accurately predict polymer/POSS combinations which are capable of successful interactions;...
This paper presents a study of rapid thermal annealing (RTA) effects on self-assembled In(Ga)As/GaAs quantum dots (QDs) using Raman scattering and photoluminescence (PL) spectroscopy. The PL dependence on excitation shows the existence of two size distributions of QDs (small and large) after annealing. However, Raman scattering shows one longitudinal optical (LO) phonon peak of the QD. We have presented...
The electrochemical behaviour of 2-dimethylaminoethanol (DMA) on the corrosion of Type 304 austenitic stainless steel in dilute hydrochloric solution was investigated through a weight-loss technique, open circuit potential measurement and potentiodynamic polarization tests at specific concentrations of DMA. Results show the compound to be highly effective with a maximum inhibition efficiency of 79...
To investigate the interaction mechanism, clay inhibition and compatibility of sodium silicates as shale inhibitor in water based drilling fluid, a variety of properties were characterized. Zeta potential, activity, colloidal stability and particle size were employed to characterize the colloidal properties. Adsorption, cuttings hot-rolling dispersion, linear swelling, pressure and osmosis transmission...
Class-F fly ash (FA) from a coal-fired thermal power station was subjected to high energy ball milling-induced mechanochemical activation aided by a surfactant. Subsequently, ethylene-octene copolymer/mechanochemically activated FA (EOC/MCA-FA) composites were prepared by solution casting. The surface modification of FA was confirmed from contact angle measurements and FTIR spectroscopy, which accounts...
Two new methylsilylsulfides are synthesized. Propeller-like chirality is described for triaryloxysilanethiol and its methyl derivative. S-methylation of the silanethiol lowers the overall symmetry of the unit cell.
We report the design, fabrication and characterization of electrically tunable, bulk micro machined, doubly clamped, circular cross-section flexure based square-plate Metal-On-Oxide, DC bias tension applied, resonant micro-mirrors for different frequencies starting from 1 kilohertz to 172 kilohertz on silicon {100} oriented wafers with high Q factors in the air, that have high resilience. Though silicon...
The splitting of band structure and absorption spectra, for silicon nanotubes (SiNTs) under axial magnetic field, are studied using the tight binding approximation. It is found that band splitting is approximately proportional to the magnitude of magnetic field as Δ E E g = ν ii Φ Φ 0 where ν ...
In this article, silicon is discussed as a possible building block for life within the solar system. Using NASA’s definition of life: ‘chemical system capable of Darwinian evolution’, a narrow description is obtained and analyzed. The possibilities of silicon life are then explored by describing its bonding characteristics, ability to withstand extreme temperatures, and abundance. Titan is investigated...
Herein we report the first synthesis of 1,5- di-(ethylphenyl)-1,5-dimethyl-3,3,7,7-tetraphenylcyclotetrasiloxane using a new ‘One Pot’ procedure as recently reported for the preparation of strictly alternating 1,1,5,5-tetramethyl-3,3,7,7-tetraphenylcyclotetrasiloxane by the heterofunctional condensation of diphenylsilanediol with (phenylethyl)methyldichlorosilane in the presence of the ter tiary amine,...
A prism coupler based plasmonic sensor consisting of a prism, gold (Au) metal film and dielectric sample has been investigated with the use of admittance loci method in wavelength interrogation mode. Prism materials namely fused silica, chalcogenide (2S2G) and silicon have been used to study their effect on surface plasmon sensing in wavelength interrogation mode by admittance loci plots and by corresponding...
A series of polyurethane/polyhedral oligomeric silsesquioxane (PU/POSS) nanohybrid elastomers, synthesized from diphenylmethane-4,4’-diisocyanate (MDI), po- lyoxytetramethylenediol (PTMG), 1,4-butanediol (BD) and 1-(1-(2,3-dihydroxypropoxy)butyl)-3,5,7,9,11,15-isobutyl- pentacyclo-[9.5.1.13,9.15,15.17,13]-octasiloxane(PHIPOSS), have been submitted to thermal stability investigations under an oxidizing...
Combined optical and FTIR were measured for binary bismuth borate glass together with samples containing 2.5 – 15 mol % Bi2O3 glasses to justify the role of bismuth (Bi3+) ions on the spectral properties. The density and molar volume values were calculated to obtain some insight on the compactness and structural arrangement in the network. DTA measurements were carried out to calculate the thermal...
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