Materials Literature
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An empirical potential energy function for fluor- and for hydroxyapatite is formulated and parametrised. The parameter optimisation involves a hierarchy of reference data and techniques comprising of quantum-chemical calculations for Coulomb interactions and intramolecular contributions, as well as experimental data a…
Many 'interesting; correlated electron materials exhibit an unusual sensitivity of measured properties to external perturbations, and in particular to imperfections in the sample being measured. It is argued that in addition to its inconvenience, this sensitivity may indicated potentially useful properties. A partial…
We investigate the stress-driven morphological instability of epitaxially growing multilayer films, which are coherent and dislocation-free. We construct a direct elastic analysis, from which we determine the elastic state of the system recursively in terms of that of the old states of the buried layers. In turn, we u…
In a continuum description of materials, the stress tensor field $\bar{% \barσ}$ quantifies the internal forces the neighbouring regions exert on a region of the material. The classical theory of elastic solids assumes that $\bar{\barσ}$ determines the strain, while hydrodynamics assumes that $\bar{\barσ}$ determines…
The temperature and volume dependences of the thermal conductivity of solid Kr(1-x)Xe(x)solution are analyzed within the model in which heat is transferred by mobile low-frequency phonons; above the phonon mobility edge this is done by "localized" modes migrating randomly from site to site. The phonon mobility edge (w…
Using density-functional theory with ultrasoft pseudopotentials, we previously investigated the structural and electronic properties of the low-pressure (cubic, tetragonal, and monoclinic) phases of ZrO2 and HfO2, in order to elucidate phonon modes, Born effective charge tensors, and especially the lattice dielectric…
Under mechanical deformation, most materials exhibit both elastic and fluid (or plastic) responses. No existing formalism derived from microscopic principles encompasses both their fluid-like and solid-like aspects. We define the {\it statistical texture tensor} to quantify the intuitive notion of stored deformation.…
Abstract Electrospinning gives rise to polymer nanofibers. The spinning process is characterized by strong deformations of the polymer material taking place during the spinning process and a very rapid structure formation process happening within milliseconds. We were interested in the influence of the peculiar spinni…
We exploited the exceptional thermal stability and diverse molecular shapes of higher diamondoids (C22 and higher polymantanes) to isolate them from petroleum. Molecules containing 4 to 11 diamond-crystal cages were isolated and crystallized, and we obtained single-crystal x-ray structures for representatives from thr…
Production processes for carbon nanotubes often produce mixtures of solid morphologies that are mechanically entangled or that self‐associate into aggregates. Entangled or aggregated nanoparticles often need to be dispersed into fluid suspensions in order to develop materials that have unique mechanical characteristic…
Alternated a-C/a-C : Cr (about 2.5μm thickness) coatings were made by DC magnetron sputtering from graphite and Cr target in an argon discharge. Mechanical and tribological properties were measured by indentation, scratch and pin-on-disc test. The critical scratch load of a-C/a-C : Cr multilayer coatings for total fai…
A 10-year outdoor exposure test has been carried out to investigate atmospheric corrosion behavior of hot-dip aluminized SUH409L steel sheets in an industrial and a marine environments. Corrosion current density distribution at scribed coating area was measured by scanning vibrating electrode technique (SVET) to study…
SUMMARYThe properties of anodic films produced by anodising aluminium in aqueous solutions of organic acids at room temperature at commercially interesting current densities were investigated with particular emphasis on the wear index, micro hardness, surface roughness and pore structure. Voltage time curves obtained…
Het laboratorium- en literatuuronderzoek in dit proefschrift betreft de mogelijke effecten van reacties van de organische matrix van dentine op cariës.
Test pieces of a tetragonal zirconia polycrystal containing 3mol% yttria were deformed in tension under superplastic conditions in air to pre-determined nominal strains ranging from 0.0 to 200%. The X-ray diffraction experiments were conducted on surface regions of gauge sections of the deformed test pieces to investi…
This paper describes some of the processing issues for extruding salicylic acid-based polymer prodrugs into fibers for medical devices. Polymeric prodrugs, in which a drug is polymerized in a degradable polymer that delivers controlled quantity of the drug to a targeted site in the body as the device degrades, are a n…
Luminescent polymer electrolyte composites composed of silica coated Y 2 O 3 :Eu in polyethylene glycol (PEG) matrix has been produced by initially synthesizing silica coated Y 2 O 3 :Eu and mixing with polyethylene glycol in a lithium salt solution. High luminescence intensity at round 600 nm contributed by electron…
Dispersive features observed in graphite, carbon nanotube bundles and isolated single‐wall carbon nanotubes are discussed. Special attention is given to the effects of the van Hove singularities in 1D nanotubes.
A novel tubular solid oxide fuel cell configuration with high volumetric power packing density is discussed. With good thermal shock resistance, high mechanical strength, easy sealing, and high volume manufacturing ability, tubular SOFC designs offer many advantages over planar designs. One shortcoming is the lower vo…
Tensile deformation was carried out for a mechanically milled Al–1.1 mol%Mg–1.2 mol%Cu alloy at temperatures of 523–823 K and a true strain rate of 1×100 s−1. The largest uniform elongation prior to local necking occurred at an intermediate temperature (748 K). This temperature dependence of the uniform elongation was…