Materials Literature
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The syntheses, magnetochemistry and crystallography of [Fe(L1)2]I0.5[I3]1.5 (1), [Fe(L1)2][Co(C2B9H11)2]2 (2) and [Fe(L2)2][SbF6]2 (3) (L1 = 2,6-di(pyrazol-1-yl)pyridine; L2 = 2,6-di(3-methylpyrazol-1-yl)pyridine) are described. Compounds 1 and 3 are high-spin between 5-300 K. For 1, this reflects a novel variation of…
A field theory of frictionless grain packings in two dimensions is shown to exhibit a zero-temperature critical point at a nonzero value of the packing fraction. The zero-temperature constraint of force balance plays a crucial role in determining the nature of the transition. Two order parameters, <z>, the deviation o…
Granulated gold films activated by cesium and oxygen are found to produce an intense photoelectron emission band about 100 nm wide at a wavelength of 530 nm with a sensitivity of about 4 mA/W in the visible range. This band is likely to be associated with excitation of surface plasmons. The results obtained indicate t…
Abstract Summary: The objective of this research was to verify the influence of adding increasing amounts of lauric acid on the functional properties of homogenized films made from gelatin, triacetin and a blend of palmitic and stearic acids. The films were characterised with respect to their visual aspect, water vapo…
A piezoelectric 2D-optical micro scanner was fabricated with PZT thick-film actuators prepared using Arc Discharge Reactive Ion-Plating method. Two orthogonal pairs of unimorph actuators were used to compose a double-gimbal structure. The inner and outer actuators were controlled independently. A large elliptical mirr…
Abstract Dry grinding of illite particles has been investigated by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and nitrogen adsorption techniques. Prolonged grinding results in an amorphous illite structure and the mechanochemical effect markedly promotes a reduction in reflection intensit…
Abstract Two new π‐conjugated polymers containing 1,3,5‐triazine units in the main chain, Pa and Pb , are reported. Pa and Pb (R = H and OCH 3 , respectively) showed blue photoluminescence emissions with quantum yields of more than 50% in toluene. In the solid state, Pa and Pb showed photoluminescence maximum emissio…
We investigate the electric and magnetic properties of a benzene–vanadium complex chain [V(C 6 H 6 )] ∞ . By performing first principles calculation based on the spin-polarized density functional theory, we find that this system shows a half metallic ferromagnetic behavior, i.e., majority-spin (spin-up) electrons have…
Results regarding bifacial silicon solar cells with external busbars are presented. The cells consist of [ n + p ( n ) p + ] Cz -Si structures with a current-collecting system of new design: a laminated grid of wire external busbars (LGWEB). A LGWEB consists of a transparent conducting oxide film deposited onto a Si s…
Magnesium and its alloys as bio-materials have many obvious advantages. It is possible to develop new type of bio-degradable medical magnesium alloys by use of the poor corrosion resistance of magnesium. The effect of impurity content and processing state on the bio-corrosion properties of two pure magnesiums in the p…
High-resolution transmission electron microscopy (HRTEM) and density functional calculations are used to study the effect of interface polarity on the atomic and electronic structure of the prototype ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}(111)∕\mathrm{Mg}\mathrm{O}(111)$ polar oxide interface. We show that atomically abru…
The La 4 (Ga 2 - x Ti x O 7+ x /2 □ 1 - x /2 )O 2 ( x = 0−2) cuspidine series has been prepared as single phases in the full compositional range. The evolution of the cell parameters is smooth along the series although the symmetry changes from monoclinic P 2 1 / c for La 4 (Ga 2 O 7 □ 1 )O 2 to orthorhombic Pnam for…
Abstract Summary: Polymer latex particles were synthesized in the presence of inorganic particles, which had been organically‐modified to promote favorable interactions with growing macromolecules. The organic modification was performed using three different routes: (1) surface covalent grafting of vinyl trialkoxysila…
Simulation of small-angle x-ray scattering from collagen in healthy and cancerous breast tissue may reveal detailed information on the structural changes in collagen. Collagen fibril is modelled as a cylinder with axially periodic step-function electron density, and packing is approximated by placing the cylinders in…
Potassium dichromate initiated polymerization of aniline in acidified aqueous medium was carried out as a function of parameters such as pH, aniline/oxidant mole ratio, temperature and time. Optimum reaction conditions are outlined for the chemical synthesis of the polymer. Spectral, thermal, electrical and viscosity…
We discuss a method for the production of microwave polymer-dispersed liquid-crystal devices. We also show how to obtain a fine grained uniform fibrous polymer network. We then measure how the microwave-band dielectric properties and response-time characteristics of microstrip-line-type polymer-dispersed liquid-crysta…
Raman analyses of single crystals of ikaite, CaCO 3 ·6H 2 O, synthesized in a diamond-anvil cell at ambient temperature yield spectra from 0.14 to 4.08 GPa; the most intense peaks are at 228 and 1081 cm -1 corresponding to E g (external) and A 1g (internal) modes of vibrations in CO 3 2. ions, respectively. These are…
This paper presents results for focused ion beam (FIB) processing of two photonic devices: 1) a GaN laser with a fourth-order grating for vertical emission, and 2) a two-dimensional (2-D) photonic crystal (PhC) structure. For the GaN laser, both L-I and I-V results are shown before and after etching, and vertical emit…
Epoxy‐based layered silicate nanocomposites of various compositions were synthesized and their physical and water vapor diffusion properties studied. Mixtures of an epoxide monomer, diglycidyl ether of bisphenol A, with nonmodified sodium montmorillonite (NaMMT) or organophilically modified montmorillonites were prepa…
A novel approach toward improvements of oral chemotherapeutic formulations has evolved, which combines solubilisation (molecular dispersion) of the hydrophobic anticancer drugs in micelles attached to large macromolecules or microparticles. The large size of the macromolecules or microgels prevents the gel components…