Materials Literature
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The photophysical and structural features of a series of linear, Aib-based peptides were investigated in methanol solution. These compounds have the general formula P(Aib) n N, where Aib is α-aminoisobutyric acid, N naphthalene, and P the monomethylated protoporphyrin IX, the two latter molecules being covalently atta…
First-principles pseudopotential calculations are reported for the lattice distortion and electronic properties of the Al substitutional defect in $\ensuremath{\alpha}$ quartz. We determine microscopical properties of the center such as Al coordination, symmetry of the distorted lattice and defect-induced electronic s…
The polycarbyne polymer films were coated on silicon substrates and then irradiated by a pulsed Nd:yttrium–aluminum–garnet laser (λ=532 nm) with various fluences in argon gas atmosphere. Significant changes in microstructures and chemical bonding (sp3/sp2) during laser treatment were investigated by Raman spectroscopy…
The molecular structure of the formal iron(IV) porphyrinate derivative, [[Fe(TTP)]2N]SbCl6 (TTP = tetratolylporphyrinate), is reported. The structural parameters are compared to the previously reported species [Fe(TPP)]2N, in which the iron oxidation state is +3.5. Both the equatorial and axial bond distances in [[Fe(…
The helical twisting power βM determines the pitch of the chiral nematic phase produced when a nematic liquid crystal is doped with a low concentration of chiral solute molecules. Molecules with large βM values have potential applications in electro-optic displays and in optical data storage. This paper describes a ne…
The results of a detailed molecular-dynamics study of the growth of amorphous carbon $(a\ensuremath{-}\mathrm{C})$ are reported. Carbon atoms with kinetic energies between 10 and 150 eV are deposited on $a\ensuremath{-}\mathrm{C}$ surface originating from bulk $a\ensuremath{-}\mathrm{C}.$ Earlier simulation results of…
We present the results of molecular dynamics simulations of SPC/E water confined in a realistic model of a silica pore. The single-particle dynamics have been studied at ambient temperature for different hydration levels. The confinement near the hydrophilic surface makes the dynamic behaviour of the liquid strongly d…
The dynamics of lithium ions in lithium bismuthate glasses have been studied in the frequency range from 10 Hz to 2 MHz and in the temperature range from 323 to 543 K. The composition dependence of the dc (direct current) conductivity has been explained in terms of the structure of bismuthate glasses. The activation e…
We report the development of compound dyes which have tunable emission wavelengths, from 520 to 680 nm, and simultaneously tunable excited-state lifetimes, ranging from 50 to 500 μs. Future work is expected to extend these ranges yet further. The compound dyes are made of a lanthanide donor with a millisecond lifetime…
The preparation, X-ray crystal structure, and magnetic properties of alternating 1,1- and 1,3-azido-bridged copper(II) complex [Cu(4,4'-dmbpy)(N3)2]n (1, 4,4'-dmbpy = 4,4'-dimethylbipyridine) have been reported. It crystallizes in triclinic system, space group P1, a = 7.9903(1) A, b = 9.3545(9) A, c = 10.754(2) A, alp…
X-ray photoemission spectra of Ge and ${\mathrm{GeO}}_{2}$ have been collected using high-energy photons ${(E}_{\ensuremath{\gamma}}=13.6\mathrm{keV}$ and ${E}_{\ensuremath{\gamma}}=11.85\mathrm{keV}).$ The experiment was carried out using a high brilliance undulator source of the European Synchrotron Radiation Facili…
Transparent poly(methyl acrylate-co-itaconic anhydride)/SiO2 hybrid materials were prepared from methyl acrylate-itaconic anhydride copolymer and tetraethoxysilane (TEOS) with the coupling agent (3-aminopropyl)triethoxysilane (APTES) via a sol–gel process. The covalent bonds between the organic and inorganic phases we…
The development of spin–electronic devices based on oxide magnets is reviewed. After a discussion of colossal magnetoresistance in magnetic perovskites and an introduction of the concept of half metallicity, spin–electronic devices such as ferromagnetic tunnel junctions, grain–boundary junctions, ferromagnet–supercond…
Positive magnetoresistance is measured in the low-magnetic fields in multiwalled carbon nanotubes, and interpreted as antilocalization in the weak-localization regime. The analysis shows that the weak antilocalization effect is related to the local interfacial electric field as a genuine property of the large curvatur…
This paper demonstrates that the pattern of silver particles embedded in the gelatin matrix of exposed and developed silver halide-based photographic film can serve as a template in a broadly applicable method for the microfabrication of metallic microstructures. In this method, a CAD file is reproduced in the photogr…
4\ifmmode\times\else\texttimes\fi{}4 matrices have been used extensively to study the propagation of light in anisotropic layered systems whose principal optic axes have arbitrary orientation. We present a general theory for the propagation of light in arbitrarily anisotropic layered systems that is particularly suite…
Raman spectroscopy has been used for the first time for the characterization of perfectly 1:1 alternating α-olefin:carbon monoxide aliphatic polyketones produced by the polymerization of ethene with carbon monoxide (ECO polymers) and mixtures of ethene and propene with carbon monoxide (EPCO polymers). A procedure to d…
The adsorption mechanisms in layer-by-layer films of poly( o -methoxyaniline) (POMA) alternated with poly(ethene sulfonic acid) (PVS) are controlled by H-bonding, even for charged POMA where electrostatic interactions were expected to predominate. This is shown here by analyzing adsorption isotherms using three analyt…
Oscillations with a period of $\ensuremath{\sim}150$ fs are observed in the four-wave mixing (FWM) signal of bulk CdSe and interpreted in terms of non-Markovian exciton--LO-phonon scattering. The experiments show evidence of phonon quantum kinetics in semiconductors of strong polar coupling strength and high exciton b…
This report covers initial studies in the coaggregation of nickel (Ni2+) and lanthanide (Ln3+) metal ions to form complexes with interesting structural and magnetic properties. The tripodal amine phenol ligand H3tam (1,1,1-tris(((2-hydroxybenzyl)amino)methyl)ethane) is shown to be particularly accommodating with respe…