Materials Literature
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Fixed-node diffusion quantum Monte Carlo (DMC) calculations of the ground and excited state energetics of the neutral vacancy defect in diamond are reported. The multiplet structure of the defect is modeled using guiding wave functions of the Slater-Jastrow type with symmetrized multideterminant Slater parts. For the…
We describe the fabrication of metallic Cu spiral/helical nanostructures prepared via selective electroless metallization of a phospholipid microtubule template. The metallization template is created through selective, sequential adsorption of the oppositely charged polyelectrolytes, sodium poly(styrenesulfonate) (PSS…
Clostridium thermocellum produces an extracellular multienzyme complex, termed the cellulosome, that allows efficient solubilization of crystalline cellulose. The complex is organized around a large noncatalytic protein subunit, termed CipA or scaffoldin, and is found either free in the supernatant or cell bound. The…
The resistivity and the Hall and Seebeck effects of polycrystalline n-type ${\mathrm{Ba}}_{0.996}{\mathrm{Y}}_{0.004}{\mathrm{TiO}}_{3}$ and undoped, reduced single crystal ${\mathrm{BaTiO}}_{3}$ were studied in the 100--300 K interval. Both Hall coefficient and resistivity showed similar temperature activated depende…
Electrical conduction measurements were made on two extreme types of directly linked porphyrin arrays by using nanoelectrodes. One type is the directly linked Zn(II)porphyrin arrays, consisting of 48 Zn(II)porphyrin moieties (Z48), and the other type is the completely flat, tape-shaped Zn(II)porphyrin arrays, consisti…
Abstract Nanophasic CeO 2 ‐based thin films were grown at low temperatures on SiO 2 and Si(100) by plasma‐enhanced (PE) CVD from a Ce IV β‐diketonate first generation precursor. Film depositions were carried out in low‐pressure Ar–O 2 plasmas at temperatures between 150 °C and 300 °C. The film microstructure was inves…
In this special issue on the Evo-Devo of amniote integuments, Alibardi has discussed the adaptation of the integument to the land. Here we will discuss the adaptation to the sky. We first review a series of fossil discoveries representing intermediate forms of feathers or feather-like appendages from dinosaurs and Mes…
Ni metal is evaporated onto the tips of ZnO nanorods , creating magnetic‐metal/semiconductor heterostructures (see Figure). Accurate thickness control allows tunable magnetic properties in nanosized magnetic layers on individual nanorods due to a crossover from superparamagnetism to ferromagnetism. These magnetic buil…
High-quality ZnO films have been grown on Zn-polar ZnO substrates by plasma-assisted molecular beam epitaxy. With increasing O/Zn ratio from the stoichiometric to the O-rich flux condition, the growth mode and the surface morphology changed from three-dimensional growth with a rough surface to two-dimensional growth w…
We report structural and spectroscopic data for a series of six-coordinate (nitrosyl)iron(II) porphyrinates. The structures of three tetraphenylporphyrin complexes [Fe(TPP)(NO)(L)], where L = 4-(dimethylamino)pyridine, 1-methylimidazole, 4-methylpiperidine, are reported here to a high degree of precision and allow obs…
A series of monovalent anion-containing hydrotalcites (HTCs) with the general formula Mg 6 Al 2 (OH) 16 (A) x (A‘) 2 - x ·4H 2 O (A, A‘ = Cl -, Br -, I -, and NO 3 -, 2 ≥ x ≥ 0) have been studied. Samples were synthesized by three different methods: ion exchange (IE), hydrothermal (HT), and recrystallization based on…
The theory of magnetic symmetry in quasicrystals, described in a companion paper [cond-mat/0304669], is used to enumerate all 3-dimensional octagonal spin point groups and spin space-group types, and calculate the resulting selection rules for neutron diffraction experiments.
We provide the details of the theory of magnetic symmetry in quasicrystals, which has previously only been outlined. We develop a practical formalism for the enumeration of spin point groups and spin space groups, and for the calculation of selection rules for neutron scattering experiments. We demonstrate the formali…
Dynamical and transport properties of a simple single-band spin-fermion lattice model for (III,Mn)V diluted magnetic semiconductors (DMS) is here discussed using Monte Carlo simulations. This effort is a continuation of previous work (G. Alvarez, Phys. Rev. Lett. 89, 277202 (2002)) where the static properties of the m…
Photoinduced reversible structural changes of anisotropic physical gels are applied to re‐writable patterning (see Figure, a photo of a re‐writable pattern). The change between a nematic gel and a cholesteric gel via a cholesteric liquid‐crystalline sol state is induced by trans – cis photoisomerization of the azobenz…
Sub‐micrometer‐sized tube junctions and dendrites of conducting polyaniline (e.g., see Figure) and polypyrrole have been synthesized through a self‐assembly process for the first time. It is shown that the monomer–dopant micelles act as templates for the self‐assembly of sub‐micrometer‐sized tubes, while the interacti…
Using poly(3,4‐ethylenedioxythiophene)–poly (styrene sulfonate) (PEDOT–PSS) as the transparent electrode material, all‐polymer‐based electrochromic devices (ECDs) have been constructed from only organic and polymeric components. In the picture shown, an absorption/transmissive‐type ECD maintained in its colored state…
Microwave‐digested (MWD) mesoporous materials are shown for the first time to be powerful hosts (templates) for the production of various crystalline metal oxide nanowire (the Figure shows a model) or nanosphere arrays via a simple impregnation and thermolysis synthesis. Some of the metal oxides (e.g., Co 3 O 4 ) exhi…
Poly(vinyl alcohol) (PVA) composite films using poly(vinyl pyrrolidone) (PVP) and sodium dodecyl sulfate (SDS)-covered, well dispersed single wall carbon nanotubes (SWNT) exhibit significant improvement in tensile strength and modulus as compared to the control PVA and PVA/PVP/SDS films. The evidence of load transfer…
The occurrence of room temperature ferromagnetism is demonstrated in pulsed laser deposited thin films of ${\mathrm{S}\mathrm{n}}_{1\ensuremath{-}x}{\mathrm{C}\mathrm{o}}_{x}{\mathrm{O}}_{2\ensuremath{-}\ensuremath{\delta}}$ ($x<0.3$). Interestingly, films of ${\mathrm{S}\mathrm{n}}_{0.95}{\mathrm{C}\mathrm{o}}_{0.…