Materials Literature
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Monolayers of the amphiphile 1-monopalmitoyl- rac -glycerol at the air−water interface assemble into domains in which the molecular tilt azimuth is organized into star-shaped patterns. When the domains are transferred to solid supports as Langmuir−Blodgett films, they are capable of producing a macroscopic azimuthal o…
In this paper a new iterative method is proposed for solving non-linear two point boundary value problems. The method is based on combining the well-known Newton iterative method and the Alternating Group Explicit (A.G.E.) method and is suitable for use on parallel computers.
Thin flakes of yttrium hydroxide coagulate in a manner similar to the houses of cards at an aging temperature lower than room temperature. Increasing the temperature results in an increase in the thickness of the flakes together with collapse of the structure of the house of cards. Relatively thick tablets of yttrium…
We propose a first principles computation of the thermodynamics of simple fragile glasses starting from the two-body interatomic potential. A replica formulation translates this problem into that of a gas of interacting molecules, each molecule being build of m atoms, and having a gyration radius (related to the cage…
Dielectric and Raman investigations in the temperature and frequency ranges 300–550K and 102 – 104Hz respectively show that M2(SO4). Te(OH)6 with (M = K, Rb and Cs) materials present three phase transition. The first transition observed at 480, 440 and 460K respectively for M = K, Rb and Cs and should be probably of o…
Liposomes have been used widely to improve the therapeutic activity of pharmaceutical agents. The traditional approach for such applications has been to formulate the pharmaceutical agent in liposomes prior to administration in vivo. In this report we demonstrate that liposomes exhibiting a transmembrane pH gradient i…
The reaction of tris-tetrahalogeno-o-benzosemiquinonate chromium(III) complexes, [CrIII(X4SQ)3] (X = Cl 1a or Br 1b), with bis(cyclopentadienyl) cobalt [CoIICp2], tetramethyltetraselenafulvalene (TMTSF) and tetrakis(methylsulfanyl)tetrathiafulvalene (TMT-TTF) afforded four charge-transfer compounds, [CoIIICp2][CrIII(X…
Biological polymers produced by microbial fermentation are naturally biodegradable and are potential environment-friendly substitutes for synthetic plastics. However, broader applications are restricted by high production costs. In this study, activated sludge bacteria in a conventional system treating a wastewater th…
Correlations in the atomic structure and dynamics extend in glasses and (supercooled) liquids to an intermediate range, which is a few times longer than the interatomic spacing. Motion on this length scale can be expected to be particularly revealing of collective phenomena. However, due to neutron scattering experime…
The synthesis of 2-methyl-1,4-bis[2-(4-propionyloxypropyloxyphenyl)ethenyl]benzene (1) and 2-methyl-1,4-bis[2-(4-acryloyloxypropyloxyphenyl)ethenyl]benzene (2) is reported. The liquid crystalline and photophysical behaviour has been investigated. Two liquid crystalline phases can be detected, with the lower temperatur…
The variational method for the calculation of the electronic polarizability of molecules within the NDDO-based semiempirical MO methods MNDO, AM1, and PM3 was parametrized to improve its accuracy. A training set of 156 compounds was used to fit 34 parameters simultaneously for 12 elements using a simplex optimization.…
The structure and dynamics of sodium disilicate are studied by molecular dynamics computer simulation. The structure is described by a partially destroyed tetrahedral SiO4 network and a spherical superstructure formed by the silicon and sodium atoms. The static structure factor of this simulation is in very good agree…
Deposition of thin films of LaMnO 3 from β-diketonate-type (thd) precursors and ozone in an ALE reactor has been demonstrated. At low temperatures, the Mn-O growth from the Mn(thd) 3 precursor is retarded by the growth of the La-O deposit. By tuning of the pulsing ratio, full control of the stoichiometry of the deposi…
The shape memory effect, superelasticity and two-way shape memory effect of Ni-rich Ti-Ni sputter-deposited thin films were evaluated quantitatively. The results indicated that they are almost comparable to those of bulk specimens. On the other hand, Ti-rich Ti-Ni thin films were found to exhibit a good shape memory b…
Novel hydrogen storage Mg/G composites prepared by mechanical grinding of magnesium (Mg) and graphite carbon (G) with benzene have been found to incorporate new hydrogen-storing sites, other than those due to the magnesium component, and can take up hydrogen reversibly.
Abstract A coherent approach for the design of reactive crystallization systems is presented by incorporating reaction and crystallization kinetics, and mass transfer, into an existing equilibrium‐based conceptual design method. A generic model for a well‐mixed crystallizer is developed; it is applicable to reacting s…
The static electronic longitudinal polarizability (α) and second hyperpolarizability (γ) of all-trans planar polyacetylene chains have been computed at different levels of approximation by varying the bond length alternation (BLA) along the conjugated backbone. Although the restricted Hartree–Fock (RHF) and second-ord…
The preparation and characterization of microparticles produced from a new class of functionalized, biodegradable, comblike graft copolymers is presented. The copolymers are polyester-polyamino acid hybrids, composed of a poly(L-lactic acid-co-L-lysine) (PLAL) backbone, and poly(L-lysine), poly(D,L-alanine) or poly(L-…
Zirconia, titania, titania–alumina and silica–alumina supported and unsupported MnOx catalysts were prepared and characterized by X-ray diffractometry and photoelectron spectroscopy, infrared spectroscopy and nitrogen sorptometry. Their catalytic activities were tested towards total oxidation of carbon monoxide and me…
The concept of molecular switching within a cyclic four-stage process is introduced on the basis of two structurally fused photochromic systems (A–D). The synthesis of 1,8a-dihydro-2,3-bis(2,5-dimethyl-3-thienyl)azulene-1,1-dicarbonitrile (open/closed A) is described; irradiation with UV light leads to an equilibrium…