Historically, in gas sensing literature, the focus on “mechanisms” has been oxygen species chemisorbed (ionosorbed) from ambient atmosphere, but what these actually represent and location of adsorption site surface solid are typically not well described. Recent advances computational modelling experimental science provide insights likely mechanism by which other interact with SnO2, providing in...

In the context of policy initiatives aimed at widening participation and an increasingly diverse student population, the notion of student academic engagement and how to achieve it have become important topics in academic and practitioner debates. Drawing on Biggs and Tang’s (2007) concept of Levels One, Two and Three teaching, the paper presents the findings of a qualitative study designed to ...

Available online 27 May 2013

We apply the mu n-tin e ective medium approximation to calculate the temperature dependence of the resistivity and thermopower of amorphous and liquid metals. The results show unambiguously that a large resistivity is accompanied by a negative temperature coe cient, in agreement with the experimental situation. This behavior is shown to result from a pseudo-gap which opens in the one-particle s...

SnO2 micro/nano fibers in the rutile structure were synthesized using electrospinning and metallorganic decomposition techniques. Fibers were electrospun using two different precursor solutions, one based on SnCl4 and the other on C22H44O4Sn. The fibers were sintered in air for two hours at 400, 500, 600, 700 and 800oC. SEM, AFM, XRD, XPS and Raman microspectrometry were used to characterize th...

This fluid dynamics video will illustrate an optically induced electrokinetic technique for non-invasive particle manipulation on the surface of a parallel-plate gold/indium tin oxide (ITO) electrode that is illuminated with near-infrared (1064 nm) optical patterns and biased with an alternating current (AC) signal. This technique generates strong microfluidic vortices that is constructively us...

Nickel doped TiO2nano particles (1% w/w) were prepared and immobilized on NaX zeolite and after characterization by X-ray diffraction and scanning electron microscopy used as photo catalyts for degradation of orange G. The X-ray diffraction patterns show that the supported TiO2 are crystallized in anatase form and the intensity of the zeolite peaks decreases with the incre...

This study investigated the effects of deposition techniques on the microstructural and tribological properties of Ti/TiN/TiCN/TiAlN multilayer coatings onto a Custom 450 steel substrate. The coatings were produced using cathodic arc physical vapor deposition (CAPVD) and plasma-assisted chemical vapor deposition (PACVD). The microstructural of the coatings was evaluated using (SEM), and phase f...