Materials Literature
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The whole conformation of a comb-like polymethacrylate (PMA-CH 3 ) has been determined by small-angle neutron scattering (SANS) in the isotropic and nematic phases. Its molecular weight dependence is obtained from six well-defined M values. In the isotropic phase, the persistence length is found to be l p = 10 ± 1.5 Å…
The deposition rate of calcium carbonate on a heat-transfer surface has been measured using a calcium-47 radiotracer and compared to the measured rate of thermal fouling. The crystalline phase of calcium carbonate that precipitates depends on the degree of supersaturation at the heat-transfer surface, with aragonite p…
The use of new “tailor-made” reactive statistical copolymers for the synthesis of sterically stabilized polypyrrole colloids is described. These copolymer stabilizers are readily prepared by free-radical copolymerization of (bi)thiophene-based vinylic monomers with various hydrophilic vinyl monomers such as 2-(dimethy…
Crystalline solids based on the tetrakis(4-cyanophenyl) and tetrakis(4-nitrophenyl) derivatives of zinc(II)-porphyrin or copper(II)-porphyrin as building blocks have been prepared and structurally analyzed by X-ray diffraction in order to elucidate the characteristic modes of self-assembly of these functionalized moie…
Destruction of the vortex lattice by random point pinning is considered as a mechanism of the ``second peak'' transition observed experimentally in weakly coupled layered high temperature superconductors. The transition field separating the topologically ordered quasilattice from the amorphous vortex configuration is…
The metastable phase of isotactic polypropylene (βiPP) is crystallized epitaxially on two specific nucleating agents: γ-quinacridone and dicyclohexylterephthalamide (DCHT). The resulting thin films are investigated by electron microscopy and atomic force microscopy. Epitaxial crystallization yields a biaxially oriente…
The mean diameter of monodispersed Pd nanoparticles could be controlled from 17 to 30 Å in a one-step reaction by changing the amount of protective polymer, poly( N -vinyl-2-pyrrolidone) (PVP) and the kind and/or the concentration of alcohol in the solvent. Although increasing the amount of protective polymer made the…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Neutron powder diffraction data, collected both at room temperature and at 10 K, for Pb10(PO4)6(OH)2, have been used to refine structural parameters by the Rietveld method. The compound is hexagonal at both temperatures, P 63/ m ; Z = 1, a = 9·8828(4); 9·8355(3) and c = 7·4406(2); 7·4100(1) Å at 295 and 10 K, respecti…
Near-monodisperse microscopic nanostructures of MoS 2 were prepared by thermal decomposition of two different ammonium thiomolybdate molecular precursors, (NH 4 ) 2 MoS 4 and (NH 4 ) 2 Mo 3 S 13, within the confined voids of a porous aluminum oxide membrane template. Our low-temperature (450 °C) synthetic route yielde…
We have applied the quantal hypernetted-chain equations in combination with the Rosenfeld bridge-functional to calculate the atomic and the electronic structure of compressed liquid-rubidium under high pressure (0.2, 2.5, 3.9, and 6.1 GPa); the calculated structure factors are in good agreement with experimental resul…
It is shown how to derive simple polynomial expressions for the variational configurational entropy starting from the cluster variation method (CVM). As an example, first six terms of the expansion of the entropy in powers of the nearest-neighbour (NN) short-range order (SRO) parameter are obtained for the NN Ising fe…
The photosensitivity of the photosurface deposition (PSD) effect and the durability in air of Agx(Ge0.3S0.7)100−x films (40⩽x⩽83) with thicknesses of 50–700 nm have been studied. Films of 60–65 at. % Ag and 200–300 nm thick were found to be optimal for applications in optical recording devices. Crystallized samples ha…
Successful sputtering deposition of aluminum-doped zinc oxide (ZnO:Al) thin films was carried out using the helicon-wave excited plasma (HWP). The films deposited on soda-lime glass substrates exhibited a dominant [0001]-oriented growth with a small full-width at half maximum (0.32 deg) of the (0002) x-ray diffraction…
Smoothing high-temperature superconductor (HTS) surfaces, especially HTS thin-film surfaces, is crucial for HTS thin-film device processing. In this letter, we describe a method to planarize the surface of a YBa2Cu3O7−δ HTS film down to a smoothness with a standard deviation of 1 nm or better. The method includes firs…
The dynamics of phase separation of a quenched polymer solution is studied using a stochastic molecular dynamics simulation. At early times, the elastic nature of the polymer chains generates a networklike domain morphology for sufficiently dense polymer solutions. However, at late times, this network structure breaks…
There currently exists a wide range of powerful techniques for probing surfaces, mainly involving the use of electron or ion beams under high- or ultra-high-vacuum conditions. Recently there have been major efforts to develop surface sensitive optical probes that have the inherent advantage that they can be applied in…
Using a realistic many-body potential, we have simulated the properties of double-walled carbon nanotubes with the aim of investigating the role of lip-lip interactions on nanotube growth. Surprisingly, the lip-lip interaction by itself does not stabilize open-ended growth, but rather facilitates tube closure by media…
Neutron and high-resolution synchrotron x-ray diffraction measurements have indicated a tetragonal zirconia phase with both an axial ratio of unity and internal shear deformation: The oxygen displacements from ideal fluorite positions of 0.088 and 0.078 Å are observed for 65 and 70 mol % CeO2–ZrO2 samples, respectivel…
A continuum-space bead-spring model is used to study the phase behavior of binary blends of homopolymers and the structure of the interface between the two immiscible phases. Results of numerical simulations using molecular dynamics supplemented by Monte Carlo exchanges are presented. The structure of the interface is…