Materials Literature
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Energies and free energies are calculated by density functional theory for the reaction of one and two water molecules with monomeric vanadyl species anchored on silica surface models. Whereas monohydrated species may be present depending on the local surface structure, dihydrated species are disfavored by entropy. Vi…
Abstract In this study, 7075 aluminum alloy was subjected to triple-aging of retrogression and re-aging (RRA) treatments. The alloy was retrogressed at 220 °C for 60 minutes following the T6 heat treatment and later re-aged at temperatures between 100 °C and 140 °C for 24 hours and at 120 °C for various durations in t…
Hybrid lattice cores for sandwich structures containing both solid struts and polymer foam are a recent option available to designers. These cores benefit from a synergistic effect in which the foam supports the slender struts against buckling in addition to carrying a portion of the applied loads directly. This work…
Composite material has long life, higher strength, lower weight and less maintenance cost. These properties have led to marine applications, significantly reduced energy consumption and impact to the environment. Mechanized boat deckhouses are constructed with glass fiber and polyester matrix. But the glass fiber prod…
We report on the first observation of stimulated Raman scattering (SRS) effects in tetragonal crystals of SrGdGa3O7 and SrLaGa3O7, known as host crystals for Ln3+-lasant ions. All recorded Raman-induced spectral lines were identified and attributed to the promoting χ(3)-vibrational modes of these gallates. Steady-stat…
We synthesized three pluronic-based cationic pentablock copolymers with different hydrophilic/lipophilic balance (HLB) values using atom transfer radical polymerization (ATRP), including PF127-block-poly(N,N-dimethylamino-2-ethyl methacrylate) (PF127-b-pDMAEMA), pluronic P123-block-poly(N,N-dimethylamino-2-ethyl metha…
The usage of a conventional cutting fluid in the metal cutting operations gives harmful effect for environment and to the operator’s health. In this study, experimental investigations were carried out in a drilling operation on aluminium alloy material using a liquid nitrogen (LN2) coolant. The variables in the experi…
Dihydrofolate reductase (DHFR) from Escherichia coli (EcDHFR) adopts two major conformations, closed and occluded, and movement between these two conformations is important for progression through the catalytic cycle. DHFR from the cold-adapted organism Moritella profunda (MpDHFR) on the other hand is unable to form t…
We demonstrate how optical tweezers may provide a sensitive tool to analyze the fluidic vibrations generated by the movement of small aquatic organisms. A single gold nanoparticle held by an optical tweezer is used as a sensor to quantify the rhythmic motion of a Nauplius larva (Artemia salina) in a water sample. This…
Hydrogenated diamond-like carbon (H-DLC) were deposited on GCr15 bearing steel by double cathodes pulse glow discharge (DCPGD) plasma vapour deposition at different gas volume ratios. The surface morphology, composition, microstructure, hardness and friction properties of the H-DLC films were observed. It was found th…
Nylon 66 is an engineering thermoplastic which has been found to be a suitable alternative material for metal parts in low and medium load bearing applications. Particulate filled polymer composites are preferred in this kind of tribological environment, because of their enhanced wear resistance properties. Fly ash an…
Micro sized particles such as SiC, Al2O3 and diamond particles reinforced with metal matrix composites are most commonly used in high performance applications like military, automotive and aerospace industries. Nowadays nano sized particles are replacing the micro sized particles because of their improved physical and…
Atomic clusters with specific size and composition and mimicking the chemistry of elements in the periodic table are commonly known as superatoms. It has been suggested that superatoms could be used to replace elements that are either scarce or expensive. Based on a photoelectron spectroscopy experiment of negatively…
Slurry erosion is a major concern in marine components which are subjected to wear and corrosion. These problems are addressed by developing materials which are harder and possessing excellent corrosion resistance in sea water. In this regard, there are serious attempts to modify the existing surfaces or developing ne…
The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO 2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by…
Tri n -octylphosphine oxide (TOPO) is a widely used extractant because of its high extractive ability. However, there is no systematic research on the thermodynamics of TOPO/ n -dodecane in the separation of hydrochloric acid (HCl) from aqueous solution. In this study, the liquid–liquid equilibrium (LLE) system (water…
ABSTRACT Asymmetric block copolymer based on regioregular poly(3‐hexyl thiophene) (P3HT) and poly(ethylene oxide) (PEO) was synthesized through Heck reactions. The addition of PEO block has no influence in the effective conjugation length of P3HT block and apparently provides colloidal stability for the formation of s…
The aim of the work was to investigate the wear properties of basalt short fiber reinforced aluminum Metal Matrix Composites (MMCs) using pin-on-disc wear test rig. The Al/basalt MMCs contains basalt short fiber from 2.5 to 10 % in steps of 2.5 wt. % and fabricated using compocasting technique. The influences of the c…
Gasification of renewable fuels is not common practice due to the high costs of technologies and the absence of reliably working refractories. Refractory degradation is of such high significance that improved refractory durability was ranked first by industry experts in a list of 20 research and development areas rela…
A titanium alloy is selected as an ideal material for a fuel-cell bipolar plate because it has a low density and, like aluminium, exhibits excellent corrosion resistance due to an insulating oxide film. Microchannelled bipolar plates are fabricated using a 25-ton material-testing machine by varying the parameters of t…