Ti82 coatings were deposited by hydrogen reduction of Tic14 and BCl3. The objective was to correlate process variables with thermodynamic equilibrium calculations, deposition kinetics, coating stucture and properties. Particular emphasis was given to obtaining deposits having appropriate oxidation resistance to protect CISiC composites. Fi lms, obtained at moderate temperature (800°C), acted as...

We propose a unified moving boundary problem for surface growth by electrochemical and chemical vapor deposition, which is derived from constitutive equations into which stochastic forces are incorporated. We compute the coefficients in the interface equation of motion as functions of phenomenological parameters. The equation features the Kardar-Parisi-Zhang (KPZ) nonlinearity and instabilities...

The reconstruction and growth kinetics of gallium nitride (0001) and (000 ) surfaces are studied using scanning tunneling microscopy, reflection high-energy electron diffraction, and low-energy electron diffraction. Results for bare GaN surfaces are summarized, with particular attention paid to the “pseudo-1×1” reconstruction of the (0001) face. Changes in the surface structure and kinetic proc...

In this work, we demonstrate high-throughput fabrication of periodic metallic nanohole arrays in an almost centimeter square area through simple metal deposition and peeling off processes, called template stripping [1]. A thin silica layer is used to protect the template-stripped Ag nanoholes from unwanted oxidation and also to provide a robust surface on which lipid membranes can be formed. We...

The mechanisms by which carbon nanotubes nucleate and grow are still poorly understood. Understanding and mathematically describing the process is crucial for its optimization. This paper reviews different models which have been proposed to explain carbon nanotube growth in the chemical vapor deposition process. The review is divided into two sections, the first section describes some nucleatio...

The ability of certain polypeptides to aggregate into long, thin fibrils called amyloid structures is associated with multiple protein folding disorders and is also a major problem in biotechnological and pharmaceutical applications. Here, QCM-D has been used to monitor the changes in thickness and viscoelastic properties of multilayer amyloid deposition in situ for the first time. This provide...

ZnO nanowires with a periodic instability of diameter were successfully prepared by a thermal physical vapor deposition method. The morphology of ZnO nanowires was investigated by SEM. SEM shows ZnO possess periodic bead-like structure. The instability only appears when the diameter of ZnO nanowires is small. The kinetics and mechanism of Instability was discussed at length. The appearance of t...