Materials Literature
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We demonstrate a novel synthetic scheme that can be used to differentially guide the shape of PbS semiconductor nanocrystals. Our study first demonstrates the discovery of single-crystalline star-shaped nanocrystals as novel transient species. We then carefully probe their shape evolution toward other novel nanostruct…
The larval shells of the marine bivalves Mercenaria mercenaria and Crassostrea gigas are investigated by polarized light microscopy, infrared spectroscopy, Raman imaging spectroscopy, and scanning electron microscopy. Both species contain similar shell ultrastructures. We show that larval shells contain amorphous calc…
Molecular dynamics (MD) simulations in three dimensions have been performed for a fluid with particles interacting with a continuous version of the Stell-Hemmer core-softened potential that in two dimensions has been known to reproduce most of the static and dynamic anomalies of liquid water. The pair distribution fun…
Copper electrodeposit was obtained in CuSO4+H2SO4 electrolyte solution by electrodeposition and its structure was studied by XRD. The results showed that copper electoddeposits with the highly preferred orientations of (220) and (111) could be obtained at current density 4.0 A/dm2 and 15.0 A/dm2, respectively. The tex…
The complex dielectric permittivity of 4-(2- hexyloxyethoxy)4'-cyanobiphenyl (6O2OCB) enclosed in porous samples of ZrO2 has been studied in the frequency range 10−1–106 Hz and over a wide temperature range. For the substance in the nearly spherical pores of ZrO2 no phase transition has been found, while for the subst…
Compton and Rayleigh scattering cross sections for bone, bakelite, polycarbonate, nylon, lucite, polystyrene, polyethylene, water, glycogen, fat, calcium hydroxyapatite and protein are calculated for various monoenergetic Kα X-ray energies covering the angular region from 0 to 180° using non-relativistic, relativistic…
Abstract Amorphous, hydrogenated silicon–carbon (a‐Si:C:H) films were produced by remote hydrogen plasma chemical vapor deposition (RHP‐CVD) with hexamethyldisilane (HMDS) as the starting compound. Microwave hydrogen plasma was the source of the atomic hydrogen active species. The susceptibility of particular bonds in…
The crystal structure of the 4-aminopyridinium perchlorate (4-apyH)ClO 4 has been determined at 100 K by means of x-ray diffraction as monoclinic, with space group P 2 1 , with Z = 8. The crystal undergoes two structural phase transitions: one of first-order type, reversible, at 241/243 K (on cooling/heating respectiv…
EPR, NMR, optical spectra and electrochemistry experiments on an extended series of one-electron reduced Dawson-type heteropolyanions converge to support the conclusion that the equatorial (α1) tungsten atoms are first reduced in [P2W18O62]6−. This conclusion is reinforced, for instance, by the interpretation of the e…
Based on the concept of subenergy transformation and the terminal repeller in the terminal repeller unconstrained subenergy tunneling (TRUST) algorithm, a global optimization algorithm, called the random tunneling algorithm (RTA), is proposed. RTA is a two-phase optimization method in which a global phase is carried o…
The ac and dc magnetic properties of hole-doped cobaltites with compositions La 0.5 Sr 0.5-x A x CoO 3 (A = Ca, Ba) and La 0.5-x R x Sr 0.5 CoO 3 (R = Nd, Eu) have been studied. The suppression of the cluster glass behaviour of the parent compound, La 0.5 Sr 0.5 CoO 3 , by substitutions for either the lanthanum or the…
We employ atomic force microscopy to monitor in situ, in real time, the molecular processes of crystallization of ferritin, a protein that has an inorganic single-crystalline core that can be varied. We determine the statistics of molecular attachment and detachment at the growth sites and find that the ratio of the f…
Abstract The rolling of isotactic polypropylene (iPP) with a new method of rolling with side constraints (inside a channel) was studied. It was found that deformation processes by compression in a channel die and by rolling with side constraints proceed in very similar fashions (plane‐strain conditions) and result in…
A todorokite-type magnesium manganese oxide molecular sieve material with a morphology of nanoribbons has been synthesized using a combination of techniques consisting of a sol−gel process to synthesize a nanosized tetraethylammonium manganese oxide layered material, an ion-exchange method to prepare a thin-film Mg−bu…
Abstract Dendritic polyarylether 2‐bromoisobutyrates of different generations (G n ‐Br, n = 1–3) as macroinitiators for the atom transfer radical copolymerization of N ‐hexylmaleimide and styrene in an ionic liquid, 1‐butyl‐3‐methylimidazolium hexafluorophosphate, were investigated. The copolymerization carried out in…
In methanol, the reaction of Mn(ClO(4))(2).6H(2)O and 1,2-bis(biacetylmonoximeimino)ethane (H(2)bamen) in the presence of triethylamine affords a trinuclear complex having the formula [Mn(3)(mu(3)-O)(mu(3)-bamen)(3)]ClO(4).2H(2)O. The structure of this complex shows a symmetric planar central [Mn(III)(3)(mu(3)-O)] uni…
The pressure–temperature phase diagram of BaTiO 3 has been investigated using a modification of the standard Landau potential to take account of quantum saturation of the order parameter at low temperatures. The calculated phase diagram agrees well with experiment for the cubic–tetragonal and tetragonal–orthorhombic t…
Various chain-end and in-chain functionalized polystyrenes with one, two, three, and four perfluorooctyl (C 8 F 17 ) groups with well-defined structures ( M n = (3.5−29) × 10 3 g/mol) were synthesized by the addition reaction of polystyryllithiums to phenol-functionalized agents such as 1-(4-bromobutyl)-4- tert -butyl…
Abstract Two ways of recovering the properties of the scrap plastics poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) were analyzed: (1) blending incompletely segregated polymers with a compatibilizer and (2) blending nonsegregated polymers with a small amount (2 pph) of another compatibilizer.…
Photocatalytic reactions of heterogeneous systems, probably the most complex catalytic reactions, are central to a wide variety of phenomena including those of evolution theory, energy conversion, and environmental cleanup. Although catalytic reactions are essentially surface driven, the effect of bulk structure is pa…