Materials Literature
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The phenomenon of transcrystallization was studied at the interface of UHMWPE fibers embedded in an HDPE matrix. It was hoped that epitaxial crystallization in such model composites could eventually be used to improve adhesion between these high-strength fibers and the thermoplastic matrix material. Matrix crystalliza…
Computational rheology deals with the formulation and solution of constitutive equations for non-Newtonian materials. From these the emphasis is put on polymeric materials, which exhibit both viscous and elastic behaviour in flow and deformation. These materials are often called viscoelastic materials. Polymer solutio…
Model suspension with Aerosil 380 in epoxy resin Araldite GY260 and Aerosil 380 in silicone oil M20000 are compared. The systems with 7.5%, 10% and 12.5% Aerosil 380 in Araldite GY260 show shear thickening flow behavior. A shear induced hydrodynamic force effects at the onset of shear thickening a disorder of the well…
At a closer look powder is found throughout all kind of industries. Dough and sugar in the food industry, pigments in the paint industry and drugs in the pharmaceutical industry, just to mention a few. Even though powder is obviously a common substance of a product or raw materials and therefore ingredients have to be…
The duplex stainless steels, having a volumetric fraction of 50% ferrite and 50% austenite, conciliate high corrosion resistance with good mechanical properties. But, in many circumstances different phase transformations may occur, such as that responsible for sigma phase precipitation, which make the steel susceptibl…
Chemical interaction in the TiCSi3N4 system was investigated. Thermodynamic calculations and kinetic analysis were carried out for a number of powder mixtures with various TiC:Si3N4 molar ratios in the temperature range 1300-1750 °C. Stability regions of the TiC-Si3N4 composites were defined. It was shown that the mai…
Abstract Tube-in-tube experiments involving a time-dependent variation of temperature or a strong thermal gradient were conducted in order to decipher the transport and transfer of Al in a closed medium along with dilute water. Results show that the solubility and the transport of Al are controlled by the alkali avail…
Cross-linked gelatin gels are used as biomaterials in living tissues, either as bioadhesives or as devices for sustained drug release. As these applications involve surgical insertion of gels, the effect of cross-linking on mechanical properties is relevant. The effect of cross-linking on the gel water uptake is also…
Abstract The ring‐opening polymerization of lactides has been studied in bulk using either 2‐ethylhexanoic acid tin(II) salt, Sn(Oct) 2 , or aluminum triisopropoxide, Al(OiPr) 3 , as the initiator over a wide range of temperature and monomer‐to‐initiator molar ratio. A high increase in the bulk polymerization rate has…
An improved mathematical model that takes into account the water vapor sorption mechanisms of wool fiber is developed to describe and predict the coupled heat and moisture transport in wool fabrics. The two-stage moisture sorption of wool is handled by a diffusion equation with two sets of variable water vapor diffusi…
The next generations of multilayer ceramic capacitors are expected to have active ceramic layer thicknesses of 3 μm or less. To retain a reliable ceramic device, it is advantageous to engineer a uniform and fine‐grained microstructure. In this study, a dense ceramic (>96% of theoretical) with fine‐grained size (<…
The use of cryo-techniques in macromolecular crystallography has increased enormously over the last eight years and has become a vital part of modern X-ray data-collection methods. This paper presents some reasons for the rise in popularity of cryo-techniques and a brief outline of the basic methods, followed by a det…
We have carried out two-beam interference experiments to form surface-relief gratings (SRGs) on azo polymer films under different polarization combinations. The mechanism of SRG formation on azobenzene chromophore functionalized polymer films has been shown to depend on both the spatial variation of the intensity as w…
Effects of doping on the transport properties of CoSb3 have been systematically investigated using Ni, Pd, and Pt as donor impurities. It is shown that the Hall mobility, the Seebeck coefficient, and the electrical conductivity depend strongly not only on the carrier concentration but also on these donor impurities. O…
Abstract The objective of this study was to investigate the influence of layer charge on the hydration of Mg-saturated expandable 2:1 phyllosilicates. Water retained by 12 Mg-saturated clays at 54% relative humidity was quantified gravimetrically. X-ray diffraction and total chemical analysis were used to determine th…
Immersion of samples in molten cryolite at 960°C resulted in the preferential diffusion of Si atoms out of the basal planes to form a partially ordered, cubic phase with approximate chemistry Ti . The latter forms in domains, wherein the (111) planes are related by mirror planes; i.e., the loss of Si results in the de…