Materials Literature
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We have studied the evolution of optical absorption spectra in eight samples of n type ZnO:Al as a function of excess electron concentration up to $6.7\ifmmode\times\else\texttimes\fi{}{10}^{20} {\mathrm{cm}}^{\ensuremath{-}3}$ at 300 K. The spectral assignment is examined by taking the many-body effect due to the pre…
The interactions between ${e}_{g}$ orbitals in neighboring sites are investigated in ${\mathrm{LaMnO}}_{3}$ by taking into account virtual exchange of electrons and phonons. The spin and orbital ordering temperatures and the spin-wave dispersion relation are calculated. We find that the orbital ordering is mainly caus…
Abstract An experimental and modeling study was carried out to understand the relationship between the viscosity of a multimodal latex and its particle‐size distribution (PSD) and polymer concentration. This study illustrates the inadequacy of existing models in predicting the viscosity of complex latices. It is shown…
Dendritic microenvironments are analogous to local environments created within protein superstructures. Correspondingly, properties of functional cores such as molecular recognition and catalytic activity are profoundly influenced by the surrounding dendritic branches.
A new manganese(III/IV) carboxylate cluster [Mn16O16(OMe)6(OAc)16(MeOH)3(H2O)3].6H2O has been structurally characterised and shown to display net antiferromagnetic coupling with preliminary evidence for single-molecule magnetic behaviour.
Summary The supermolecular structure of polysaccharides in unbleached sulphite pulps and kraft pulps was investigated by CP/MAS 13 C-NMR (Cross Polarisation Magic Angle Carbon-13 Nuclear Magnetic Resonance) in combination with spectral fitting. The cellulose crystallinity was found to be higher in the kraft pulps than…
The two-dimensional (2D) nonlinear optical (NLO) response of a series of dipolar donor–acceptor bis(salicylaldiminato)Ni(II) Schiff base planar coordination complexes was investigated using the INDO/SCI-SOS formalism. The in-plane 2D NLO character of this class of materials can be related to various low-energy charge-…
Aligned multiwalled carbon nanotubes (CNTs) with good crystallinity have been obtained by cutting the CNTs grown on an anodic aluminum oxide (AAO) template by a sonication method. AAO templates were fabricated by two-step anodization of Al. After the cobalt catalyst had been electrochemically deposited at the bottom o…
We cap silver, copper, and gold nanocolloids with long-chain alkylxanthates. In comparison to thiol capping, the particles are less hydrophobic and are stable in aqueous solutions for over a month, though being less stable than the corresponding oleate-capped particles. They can be transferred into relatively polar or…
The three-dimensional band structure of the III-VI layer compounds GaSe and InSe has been investigated in the tight-binding approach. The pseudo-Hamiltonian matrix elements in the ${\mathrm{sp}}^{3}{s}^{*}$ basis are fit in order to reproduce the nonlocal pseudopotential band structure, in the framework of constrained…
The steady-state rate r CO 2 of CO 2 formation from CO + O 2 on an epitaxially grown RuO 2 (110) single-crystal surface was recorded as a function of the partial pressures in the 10 -7 −10 -6 mbar range. The RuO 2 (110) surface exposes singly coordinatively unsaturated “Ru-cus” sites and 2-fold coordinatively unsatura…
Abstract A large strain finite element formulation based on a local second gradient plasticity model is presented. The corresponding constitutive equations were developed as a direct extension of microstructured (SIAM J. Appl. Math . 1973; 25 (3):556–575; Arch. Rational Mech. Anal . 1964; 16 :51–78) or micromorphic (I…
The cobalt hexacyanoferrate system, M h [Fe B (CN) 6 ] l, (where M is an alkali metal cation, and the subscripts h, k, and l are stoichiometric coefficients, and A and B are the formal oxidation states of the Co and Fe metal sites in the structure) was shown to contain a rich series of compounds that are inter-linked…
The investigation of Zn substitution in MgB2 polycrystalline samples shows that about 0.1 Zn can be substituted in the structure of Mg deficient samples while it can not be substituted in stoichiometric MgB2. As a result of the isovalent Zn substitution into the Mg position of Mg deficient samples the a and c lattice…
In our previous paper (Eur. Phys. J. E 4, 121 (2001)) we proposed a coarse-grained elastic energy for nacre, or stratified structure of hard and soft layers. We then analyzed a crack running perpendicular to the layers and suggested one possible reason for the enhanced toughness of this substance. In the present paper…
Necking or cold drawing is a smoothed jump in cross-sectional area of long and thin bars (filaments orfilms) propagating with a constant speed. The necks in polymers, first observed about seventy years ago, arenow commonly used in modern processing of polymer films and fibers. Yet till recently there was a lack infund…
Mesoporous Ti-SBA-15 has been postsynthesized by the titanation of pure silica SBA-15 in glycerol with the assistance of quaternary organic ammonium hydroxides, and has been extensively characterized by various techniques to investigate the mesostructural and catalytic properties, and the chemical nature of the incorp…
The confinement of crystallizable blocks within AB or ABC microphase-separated block copolymers in the nanoscopic scale can be tailored by adequate choice of composition, molecular weight, and chemical structure. In this work we have examined the crystallization behavior of a series of AB and ABC block copolymers inco…
alpha-MnO2 single-crystal nanorods with diameters 20-80 nm and lengths up to 6 microns have been prepared through a low-temperature liquid-phase comproportionation method, which involves no catalysts or templates and may be adjusted to prepare alpha-MnO2 single-crystal nanorods in large scale.
Microspherical mercury ion adsorbents with uniform mesopore channels were prepared by fluoride-catalyzed surfactant-directed co-condensation of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) using mildly acidic nonionic surfactant solutions. Using batch adsorption methods, mercury(II) adsorption…