Materials Literature
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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.…
Ab initio molecular dynamics (AIMD) simulations are performed for studying the S0→T1 excitation dynamics of psoralen compounds; namely, nonsubstituted psoralen, 5-methoxypsoralen (5-MOP), and 8-methoxypsoralen (8-MOP). The density functional theory calculations at the B3LYP/D95V level are used for evaluating the atomi…
A series of macrocycles with two different complexing sites of the type 3,3′-AA-2,2′-bipyridine, where AA = CONHCH2CH2NHCO, CONH(CH2)6NHCO, CONHCH2CH2NHCH2CH2NHCO and CONHCH2CH2CH2NHCH2CH2CH2NHCO have been synthesized by high dilution method and characterized on the basis of elemental analysis, NMR, and infrared spect…
We report on the polarizing electrochromic (EC) effect of a conjugated polymer. This has been achieved in a planar flexible electrochemical device cell comprised of a patterned stretch-aligned thin film of polyaniline and an electrolyte, all made on a polyethylene foil substrate. The resulting device exhibits polarize…
The heat capacities of o- and m-carboranes were measured with an adiabatic calorimeter in the temperature range 5–310 K. m-carborane underwent two phase transitions at 170 K and 284 K with transition entropies of 12.70 and 15.52 J K−1 mol−1. The total transition entropy agreed well with the theoretical value, indicati…
The thin island film theory developed by Bedeaux and Vlieger [Optical Properties of Surface(Imperial College Press (2002)], is used to unambiguously analyze spectroscopic ellipsometry spectra of thin layers of nanocolloidal gold particles on silicon substrates covered by a natural oxide layer, for coverages up to 35%.…
The 90° Brillouin scattering experiment has been performed on a Pb(Zn1/3Nb2/3)O3 single crystal. The frequency shift and linewidth of the c33 pure longitudinal acoustic mode and the c44 pure transverse mode show bending anomalies near Tm=397 K, at which the low-frequency dielectric constant ε has a maximum value. In a…
The oxidation of methanol on a Pt(111)–(2×2)O surface has been investigated by infrared reflection absorption spectroscopy and temperature-programed desorption. Methanol is dehydrogenated to produce methoxy species in the annealing temperature range from 130 to 170 K. Above 170 K, the reaction proceeds differently, de…
We calculate the density of states of a binary Lennard-Jones glass using a recently proposed Monte Carlo algorithm. Unlike traditional molecular simulation approaches, the algorithm samples distinct configurations according to self-consistent estimates of the density of states, thereby giving rise to uniform internal-…
Mn-doped ZnGa2O4−xSex thin film phosphors have been grown using pulsed-laser ablation under various growth conditions. The structural characterization was carried out on a series of ZnGa2O4−xSex:Mn2+ films grown on MgO(100) substrates using Zn-rich ceramic targets. Zn-rich ceramic targets have been prepared to compens…