Materials Literature
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Abstract The availability of an excellent and freely available molecular visualisation package authored by Roger Sayle‐RasMol, coupled to the protein data bank (PDB) resource of molecular structure data makes the visualisation and manipulation of molecular data accessible to the Internet community. Tutorials based on…
Superplastic deformation is arguably the most dramatic and direct illustration of the influence of grain boundaries on the mechanical properties of fine grained metals. Stable tensile elongations in excess of 1000%can be attained under suitable conditions, and microstructural observations show that most of this strain…
In this study we present the fabrication, the optical characterization and the electrical operation of a high quality, nanometer-sized, silicon-based light modulator made of nematic liquid crystals (LC) encapsulated into porous silicon (PSi) multilayer matrix. We first demonstrate the infiltration procedure and charac…
New cell designs of coaxial microwave cavity type are reported for simultaneous electrochemical electron spin resonance measurements. Adjustable metallic shields are introduced so that the working electrode can be much shorter than the full height of the cavity. Besides the traditional helical electrode, the working e…
We found that large single grains of lead zirconate titanate (PZT) thin film of which grain size was as large as 40 µm in length could be fabricated by lateral crystallization from the seeds. The seeds were prepared on the Pt substrate in the form of crystallized PZT dots. The electrical characteristics of PZT thin fi…
X-ray and neutron diffraction measurements are presented for a number of carbon samples prepared by different techniques. The information obtained from diffraction studies is presented in relation to other types of investigation, particularly in relation to electron microscopy. The characteristics of the graphene shee…
I am writing a book chapter on the taxonomy and ecology of araphid and monoraphid freshwater diatoms in North America. Some species names in recently described genera belonging to these groups are invalidly published (Fourtanier & Kociolek 1999). Other necessary transfers have not been made. This note is not an exhaus…
Single crystals of the {001}〈100〉 orientation of an Al–0.05Si single phase alloy have been deformed in plane strain compression at temperatures of 300–500°C and strain rates of 0.5–50 s-1, and annealed in a salt bath at temperatures of 300–450°C. Quantitative texture measurements by electron backscatter diffraction (E…
During a recent compilation of a Great Lakes Diatom species checklist (Stoermer et al. 1999) several new nomenclatural combinations, which to our knowledge have not yet been made in the literature, came to our attention. In order to more closely align literature on Great Lakes diatoms with current taxonomic understand…
The crystal structure of NaBi 3 V 2 O 10 has been determined using the ab initio approach followed by Rietveld refinement via powder X-ray diffraction. The unit cell is triclinic, space group P 1̄, with a = 7.1964(4) Å, b = 7.0367(3) Å, c = 5.5139(2) Å, α = 84.440(3)°, β = 113.461(2)°, γ =112.319(2)°, and V =236.46(2)…
Four side chain liquid crystalline (LC) polyacrylates containing substituted (methyl/long alkyl) azobenzene mesogens attached directly to the polymer backbone were synthesized. The polyacrylates were synthesized by free radical polymerization of the respective monomers, 4-[(4-acryloylexyphenyl)azo]benzoic acid, 4-[(4-…
The relation between the chemical reactivity of a dissolving pulp and the molecular mobility of cellulose was investigated by an unconventional method for these problems: dielectric relaxation spectroscopy (DRS). Carefully dried pulps show better reactivity in comparison to a mill dried sample. A specific deformation…
We investigate theoretically the liquid crystalline phase behaviour of globular dendrimers consisting of a soft inner scaffold and peripheral mesogenic units attached to the scaffold by means of flexible chains. We use a generalised Onsager molecular theory to analyse model systems exhibiting conformational rod-sphere…
The tetra(hydroxyphenyl)porphyrins (5,10,15,20-tetrakis(2-hydroxyphenyl)porphyrin (3), 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin (4), and 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (5) and the tetrahydroporphyrins (5,10,15,20-tetrakis(2-fluoro-3-hydroxyphenyl)porphyrin (6), 5,10,15,20-tetrakis(2,4-difluoro-3-hy…
The thermoforming of thermoplastic sandwich structures based on the same matrix polymer for the face sheets and the core requires precise temperature control both before and during forming. Two opposing requirements must be satisfied: the face sheets must be heated to above the glass transition temperature of the poly…
The phase coexistence behavior of the solvent primitive model (SPM) is studied by constant pressure and temperature Gibbs ensemble Monte Carlo simulations. In the SPM, the ions are modeled with charged hard spheres, while the solvent molecules are represented by neutral hard spheres. Fluid–fluid phase separation into…
Five process factors are varied to find conditions necessary for α and β phase formation in tantalum thin films deposited on SiC. These are: sputtering time, input power, presputter etch time, preheat time at 250 °C, and sputtering temperature. An empirical model is developed that predicts the maximum or minimum amoun…
The molecular weight averages and the degree of branching, DB, of a hyperbranched polymer obtained by self-condensing vinyl polymerization (SCVP) of a macroinimer A-(m)γ-B* is calculated by modifying the existing equations for SCVP. The polydispersity is lowered by a factor (γ + 1), where γ is the degree of polymeriza…
Titanium tin carbide (Ti2SnC) is a novel layered ternary compound. The ab initio calculations on the electronic structure and bonding properties indicated that Ti2SnC exhibit anisotropy of chemical bonding and properties. The electrical conductivity parallel to the basal plane is metallic and is much higher than that…
The time-resolved photoluminescence (PL) of luminescent porous silicon has been investigated in-situ when porous silicon is immersed in chemically inert organic solvents. PL transients are recorded upon square-wave modulation of the excitation light. They are fairly well fitted with exponential curves. The obtained li…