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Rheology: An Historical Perspective

The 50th Canadian Society of Chemical Engineering Conference

Comparison of Measurement Techniques for Evaluating the Pressure Dependence of the Viscosity

The different methods that can be used for measuring the effect of a hydrostatic pressure on the viscosity of polymer melts are evaluated. A linear low-density polyethylene is chosen as test material, as it can be expected to have a small pressure dependency. Special attention is given to methods employing capillary r…

Milk Fat Composition Affects Mechanical and Rheological Properties of Processed Cheese

Laboratory-scale experiments were carried out to explore the influence of the composition of the fat phase on mechanical and rheological properties of processed model cheeses. Cheeses made from caseinates, emulsifying salts and a milk fat fraction liquid at 24°C, which was achieved by thermal separation, showed much l…

The Society’s Site: Time period March 2001 to August 2001

The 14th Conference of the European Colloid and Interface Society

Plastic Solar Cells

Recent developments in conjugated-polymer-based photovoltaic elements are reviewed. The photophysics of such photoactive devices is based on the photo-induced charge transfer from donor-type semiconducting conjugated polymers to acceptor-type conjugated polymers or acceptor molecules such as Buckminsterfullerene, C60.…

A new algorithm for dissipative particle dynamics

Analogies between dissipative particle dynamics (DPD) and stochastic dynamics are exploited to derive a new algorithm for DPD with an improved temperature control, without recursion or tuneable parameters.

The Surface Chemistry of Imogolite

Abstract Imogolite is a tubular aluminosilicate which is common in Andosols and Spodosols. The high pH at point-of-zero charge at the outer parts of the tube and the anomalously high chloride adsorption of imogolite suggested that there may be structural charge associated with this mineral. The structural charge may a…

Carrier-induced ferromagnetism inp−Zn1−xMnxTe

We present a systematic study of the ferromagnetic transition induced by the holes in nitrogen doped ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$ epitaxial layers, with particular emphasis on the values of the Curie-Weiss temperature as a function of the carrier and spin concentrations. The data are…

Thermal Conductivity of β‐Si 3 N 4 : III, Effect of Rare‐Earth (RE = La, Nd, Gd, Y, Yb, and Sc) Oxide Additives

β‐Si 3 N 4 ceramics sintered with a series of rare‐earth (RE = La, Nd, Gd, Y, Yb and Sc) oxide additives were fabricated by hot pressing and subsequent annealing. Their microstructures, lattice oxygen contents, and thermal conductivities were evaluated. Mean grain size increased, while lattice oxygen content decreased…

Efficient neodymium-doped glass-ceramic fiber laser and amplifier

We report an efficient glass-ceramic fiber laser and show that its slope efficiency (~30%) is not compromised by the presence of Nd-doped fluoride crystals embedded within the core of the single-mode optical fiber. In contrast, the spectroscopy (fluorescence and gain spectrum) of the Nd(3+) ions is dramatically change…

Analytical TEM study on the dispersion of Au nanoparticles in Au/TiO 2 catalyst prepared under various temperatures

Abstract Transmission electron microscopy (TEM) observations were made for Au/TiO 2 catalysts prepared by calcination in air at different temperatures from room temperature to 873 K in order to study the growth process of Au particles over the surface of TiO 2 . Many Au clusters with diameters of ∼1 nm were observed o…

Atomistic Simulation of Dopant Incorporation in Barium Titanate

The results of an atomistic simulation study on the incorporation of ions of the first series of transition metals (Cr 3+ , Cr 4+ , Fe 2+ , Fe 3+ , Co 2+ , Co 3+ , Ni 2+ , and Ni 3+ ), Y 3+ , and ions of the lanthanide series (Er 3+ , Gd 3+ , Tb 3+ , Pr 3+ , Pr 4+ , and La 3+ ) in the BaTiO 3 lattice are presented and…

Density-functional theory of elastically deformed finite metallic system: Work function and surface stress

We study the external strain effect on the surface properties of simple metals within the framework of a modified stabilized jellium model. We derive the equations for the stabilization energy of the deformed Wigner-Seitz cells considered as a function of the bulk electron density and the given deformation. The result…

Exponential decay properties of Wannier functions and related quantities

The spatial decay properties of Wannier functions and related quantities have been investigated using analytical and numerical methods. We find that the form of the decay is a power law times an exponential, with a particular power-law exponent that is universal for each kind of quantity. In one dimension we find an e…

Violation of the fluctuation-dissipation relation during the formation of a colloidal glass

The relationship between the conductivity and the polarization noise is measured in a colloidal glass as a function of frequency in the range 1 Hz-40 Hz. It is found that at the beginning of the transition from a fluid-like sol to a solid-like colloidal glass the fluctuation-dissipation relation is strongly violated.…

Triangular CdS Nanocrystals: Structural and Optical Studies

CdS nanostructures with high crystallinityare widely investigated for their semiconductor properties. This work focuses on the preparation and properties of equilateral-triangular nanocrystals made by colloidal self-assembly. The picture shows the results of high-resolution transmission electron microscopy imaging of…

Thin-Film Formation of Calcium Carbonate Crystals: Effects of Functional Groups of Matrix Polymers

We report on the preparation of the thin films of calcium carbonate (CaCO 3 ) crystals on solid matrixes, i.e., cellulose, chitosan, and chitin in the presence of an acidic macromolecule. The crystal growth from CaCO 3 solution containing poly(acrylic acid) as a soluble acidic polymer results in the formation of CaCO…

Strain-dependent local empirical pseudopotentials for lattice mismatched III-V semiconductors, their alloys, heterostructures and nanostructures

For the latest EPM potentials, please see appendix A in Physical Review B, 59, 15270 (1999)