Materials Literature
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Vitronectin (Vn) is an abundant glycoprotein present in plasma and the extracellular matrix of most tissue and is an important medium required for bone cells to attach and spread on biomaterial surfaces. Hence, Vn adsorption is an initial and key step in implantation. In this study, adsorption of Vn molecules on mica…
In quasicrystalline ${\mathrm{Al}}_{70}{\mathrm{Pd}}_{21}{\mathrm{Mn}}_{9},$ atomic processes as, e.g., thermal vacancy formation are studied specifically by a combination of positron lifetime and two-detector coincident Doppler broadening measurements. Two types of vacancies are detected: structural vacancies with an…
Comprehensive investigations were carried out to study the correlation between the temperature coefficient of resistance (TCR) and both the microstructure and the stressvoiding behavior of copper dual damascene (DD) interconnects. TCR values have been investigated with regard to median grain size and crystal lattice d…
In order to investigate the topological effects of chain molecules, united-atom molecular dynamics simulations of a 500-mer polyethylene linked by 50 hexyl groups (a grafted polymer having 52 ends) are carried out and analyzed in terms of Voronoi space division. We find that the volume of a Voronoi polyhedron for a ch…
We have compared the electromigration performance of Cu electromigration structures with varying line lengths imbedded in two different ILD materials. In the regime of high jL where there is no significant back-stress, we observed that three of the key electromigration parameters (i.e., MTF, n, and /spl sigma/) are co…
Undoped ZnO single crystals were implanted with multiple-energy N + ions ranging from 50 to 380 keV with doses from 10 12 to 10 14 cm −2 . Positron annihilation measurements show that vacancy defects are introduced in the implanted layers. The concentration of the vacancy defects increases with increasing ion dose. Th…
The influence of misfit dislocations on the statics and dynamics of $90\ifmmode^\circ\else\textdegree\fi{}$ domains (twins) in epitaxial thin films is studied theoretically. The misfit dislocations create additional potential barriers, which hinder the movements of domain walls along the film/substrate interface. For…
The shikimate pathway synthesizes aromatic amino acids and other essential metabolites that are necessary for bacteria, plants and fungi to survive. This pathway is not present in vertebrates and therefore represents an attractive target for antibacterial agents. We have successfully crystallized and solved the struct…
Scanning tunnelling microscopy (STM) and current imaging tunnelling current spectroscopy (CITS) methods were performed on polycrystalline diamond films grown on silicon substrates grown by microwave plasma-enhanced chemical vapour deposition. Large tunnelling currents were observed at some grain boundaries and crystal…
We have investigated the dynamics of phenylene rings in a glassy polysulfone (bisphenol-A-polysulfone) by means of quasielastic neutron scattering. Nowadays it is well known that these molecular motions are directly connected with the mechanical properties of engineering thermoplastics in general. The particular syste…
We investigate ring formation of single-walled carbon nanotubes theoretically in this paper. The conformation energy of the nanotubes is identified as the curvature elastic energy of a curved graphite and the intertube van der Waals interaction. The entropy of ring nanotubes depends on the total number of carbon atoms…
Stress induced voiding (SIV) is explored from the aspects of design attribute and geometry parameters. Two kinds of test structures were used to evaluate resistance change in relation to reliability and to understand the SIV mechanism. Thus, a reliability-robustness guideline from a consideration of geometry configura…
Results from a molecular dynamics simulation of a melt of unentangled polymers are presented. The translational motion, the large-scale and the local reorientation processes of the chains, as well as their relations with the so-called "normal" and "segmental" dielectric relaxation modes are thoroughly investigated in…
Time-dependent dielectric breakdown (TDDB) of sub-half-micron Cu interconnects was investigated with regard to the waiting time between Cu-CMP and barrier dielectric deposition. Breakdown voltage and TDDB lifetime between adjacent Cu wires deteriorated abruptly as the waiting time in air passed 4 days. This is due to…
Abstract The adsorption of several chitosan samples with different degrees of deacetylation (65, 73, 85, and 92%) and their interactions with the main components of reed pulp suspensions were investigated with gel permeation chromatography, phenol/sulfuric acid spectrophotometry, microelctrophoresis, and retention/dra…
It is increasingly realised that the status of measuring the thermal properties of thermal interface materials (TIMs) and the proliferation of these data cause much irritation to vendors and users alike. This paper discusses the various problems underlying the status quo and offers a strategy to overcome the problems…
Molecular dynamics computer simulations are used to determine the self-diffusion coefficients for a Gay-Berne model mesogen GB (4.4,20,1,1) in the isotropic, nematic and smectic A phases along two isobars. The values of the parallel and perpendicular diffusion coefficients, D(parallel) and D(perpendicular), are calcul…
In this work the study of the dynamics of the segmental motions close to T g of a poly(methyl methacrylate), PMMA , network was analysed by distinct mechanical spectroscopy techniques. Three techniques were employed: dynamic mechanical analysis (DMA), creep and thermally stimulated recovery (TSR). The time–temperature…
The device and circuit implications of carbon nanotube field effect transistors (CNFET) as a logic technology are assessed. The salient device characteristics and fabrication techniques are described based on measured device parameters. The device/circuit performance of CNFET are estimated and the key technical challe…
Abstract The reinforcement mechanics of viscose‐fiber‐reinforced polypropylene (PP) composites were studied. The effect of the coupling agent, maleated polypropylene (MAPP), was of special interest. The fibers, coupling agent, and PP were extruded and injection‐molded. The composition, mechanical properties, fracture…