Materials Literature
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We study fluid flow in the vicinity of textured and superhydrophobically coated surfaces with characteristic texture sizes on the order of 10μm. Both for droplets moving down an inclined surface and for an external flow near the surface (hydrofoil), there is evidence of appreciable drag reduction in the presence of su…
Targeted drug delivery is an important research area in specific therapy. Transferrin-conjugated nanoparticles are an attractive formulation as a vehicle for specific cellular uptake and targeted drug delivery. In this report, atomic force microscopy imaging was used to visualize the process of cellular uptake of tran…
We report a general synthetic method for the formation of shape-controlled CdS, CdSe and CdTe nanocrystals and mixed-semiconductor heterostructures. The crystal growth kinetics can be manipulated by changing the injection rate of the chalcogen precursor, allowing the particle shape-spherical or rodlike-to be tuned wit…
<div class="htmlview paragraph">A strategy for performing transient computational fluid dynamics simulations of systems consisting of exhaust manifolds and close-coupled catalytic converters is described. The motivation for performing such a simulation is discussed, with reference to the literature, and a descri…
The correlation between the magnetic behavior and intergranular residual strain was investigated on several mild steel samples which were plastically deformed in the range 0.5%–20% engineering strain followed by unloading. At low deformation levels (0.5%–∼2%) the samples exhibited Luders banding, but after 2% strain t…
<div class="htmlview paragraph">The selective catalytic reduction (SCR) of nitrogen oxide (NO<sub>x</sub>) with ammonia (NH<sub>3</sub>) or urea ((NH<sub>2</sub>)<sub>2</sub>CO) as a reductant is becoming a promising method for near future diesel exhaust emission c…
<div class="htmlview paragraph">Palladium is well known to catalyze methane (CH<sub>4</sub>) oxidation more efficiently than platinum (Pt) and/or rhodium (Rh) catalysts. The mechanism for methane oxidation on palladium is hypothesized to proceed via a radical intermediate. Direct identification of a…
Holtstamite, Ca3(Al,Mn3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet from Wessels Mine, South Africa
Crystallographic relations between different forms of boron nitride (BN) appearing at the high pressure–high temperature structural phase transformation have been revealed by high-resolution transmission electron microscopy (HRTEM). As starting materials, crystalline hexagonal BN (hBN) with different degrees of crysta…
<div class="htmlview paragraph">Austempered cast irons have a unique microstructure (ausferrite) that provides for excellent wear properties. This paper will examine the available data in the literature on wear in several modes: abrasive wear, adhesive wear (frictional or sliding and rolling), and erosive wear.…
A continuous impingement mixing process is described that has been used to disperse unpurified single-walled carbon nanotubes (SWNTs) in a Shell EPON-862/EpiCURE system. Composites with up to 0.5 wt% of nanotubes were prepared by this process. Mechanical properties of these samples were compared with those of plain ma…
The light-emitting properties of Ge nanocrystals on an Si(100) matrix prepared by pulsed laser deposition (PLD) and in situ rapid thermal annealing (RTA) were studied. The photoluminescence (PL) intensity becomes stronger and the FWHM decreases from 100 to 50 meV when the annealing temperature varies from 300 to 600 °…
<div class="htmlview paragraph">The pore structure of DPF (Diesel Particulate Filter) is one of the key factors in contributing the fuel consumption and the emission control performance of a vehicle. The pressure loss of mini samples (1 in. in diameter, 2 in. in length) with various pore structures was measured…
<div class="htmlview paragraph">Previously reported work with a full-scale ethanol-SCR system featuring a Ag-Al<sub>2</sub>O<sub>3</sub> catalyst demonstrated that this particular system has potential to reduce NO<sub>x</sub> emissions 80-90% for engine operating conditions th…
The concept of rigid polyhedral units has been very successful in explaining a broad range of physical, chemical and thermodynamic properties of framework minerals at high temperatures. In this contribution experimental data on the high-pressure behaviour of selected framework minerals is reviewed and the ability of t…
<div class="htmlview paragraph">A new heat-resistant cast iron alloy has been developed for the exhaust manifolds of new passenger-car diesel engines. This development occurred because operating demands on exhaust manifolds have increased significantly over the past decade. These demands are due to higher exhaus…
<div class="htmlview paragraph">Moving the catalytic converter closer to the engine reduces its light-off time. However, temperature and pulsating flow have a stronger impact on a close-coupled catalytic converter than an under-floor. For close-coupled architecture, manifold design may play a major role by affec…
<div class="htmlview paragraph">Since its very beginning in 1953, Corvette has been a pioneer in light weight material applications. The new 6<sup>th</sup> generation corvette high performance Z06 model required aggressive weight savings to achieve its performance and fuel economy targets. In additio…
<div class="htmlview paragraph">In order to use modeling as a predictive tool for real-world particulate filter designs (segmented filters, non-axisymmetric designs), it is necessary to develop reliable 3-dimensional models. This paper presents a 3 d modeling approach, which is validated against engine-bench mea…
<div class="htmlview paragraph">Compositions in the mixed strontium/calcium feldspar ([Sr/Ca]O·Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>) - aluminum titanate (Al<sub>2</sub>O<sub>3</sub>·TiO<sub>2</sub>) system have been investigated as a…