Materials Literature
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Upon nitrogen adsorption at low temperature onto the surface of magnesium oxide and calcium oxide containing F S + centers (single electron trapped in a suitable surface vacancy), electron transfer occurs from the solid to the adsorbed molecule. About 90% of the total electron density is localized on the adsorbed mole…
Nonenzymatic pyridoxal phosphate (PLP) catalyzed decarboxylations and transaminations have been revisited experimentally. Metal ions are known to catalyze a variety of PLP-dependent reactions in solution, including transamination. It is demonstrated here that the rate accelerations previously observed are due solely t…
The atomic structure of cristobalite in both its high-temperature β-phase and low-temperature α-phase has been studied using constrained reverse Monte Carlo modelling of neutron total scattering data. The modelling has shown that the disorder of the β-phase involves rotations and displacements of rigid SiO 4 tetrahedr…
Several experimental and theoretical studies have related the peculiar mechanical properties of the macro-defect-free polymer−cement composites with the existence of a cross-link ing of the polymer chains by Al or Ca ions coming from the hydration reactions of the cement. In the present study, the interaction of Ca io…
An amphiphilic polyphosphazene diblock copolymer (MEEP−Ph/MEEP) based on [N P(OCH 2 CH 2 OCH 2 CH 2 OCH 3 ) 2 ] n (MEEP) as a hydrophilic block and [N PPh(OCH 2 CH 2 OCH 2 CH 2 OCH 3 )] m (Ph/MEEP) as a hydrophobic block was synthesized via the controlled cationic block copolymerization of phosphoranimine. The molecul…
This paper examines lateral capillary interactions between millimeter- and sub-millimeter-sized objects floating at the interface between perfluorodecalin (PFD) and water. It describes methods both experimental and computational that allow the shape of the interface to be described for various geometries of the intera…
This article reviews the complex ordered structures induced by chirality in liquid crystals. In general, chirality favours a twist in the orientation of liquid-crystal molecules. In some cases, as in the cholesteric phase, this favoured twist can be achieved without any defects. More often, the favoured twist competes…
The magnetotransport and magnetostructural properties of ${\mathrm{La}}_{0.7}({\mathrm{Ca}}_{1\ensuremath{-}y}{\mathrm{Sr}}_{y}{)}_{0.3}{\mathrm{MnO}}_{3}$ $(0<~y<~1)$ are studied. We investigate the variation in magnetoresistance (MR) with y and the field-induced structural transition at $y\ensuremath{\sim}0.5$…
The digestion of bacterial cellulose ribbons by ternary mixtures of enzymes consisting of recombinant cellulases (two cellobiohydrolases, Cel6A and Cel7A, and the endoglucanase Cel45A) from Humicola insolens was investigated over a wide range of mixture composition. The extent of digestion was followed by soluble suga…
Porous, low dielectric constant polyimide films have been made by a “nanofoam” approach. The pore sizes generated in the polymer films are in the tens of nanometers range, hence the term “nanofoams”. The nanoporous foams are generated by preparing triblock copolymers with the majority phase comprising polyimide and th…
The dynamic growth processes of lamellae and spherulites of a polymer (BA-C8) synthesized by condensation polymerization of bisphenol A and 1,8-dibromooctane were directly observed using an atomic force microscope at 25 ± 1 °C. The phase shift measured at the tip of growing lamellae is lower than the phase shifts of t…
We present a theory of the resonant inelastic x-ray scattering (RIXS) to study electronic excitations in orbital ordered manganites. The charge and orbital excitations of the Mn 3d electron are caused by the Coulomb interactions in the intermediate scattering state. The scattering cross section is formulated by the Li…
In a recent paper (2000 \QTR{it}{J. Phys.: Condens. Matter} \QTR{bf}{12} L133) Lee \QTR{it}{et al.} have studied the transport properties of Pr$_{0.65}$Ca$_{0.35}$MnO$_{3}$ thin films. They claimed that they are able to controlled the charge-ordered (CO) state by the lattice strains. We propose herein another alternat…
Comment on the paper of T.Bachels, H. J. Güntherodt and R.Schäfer : "Melting of Isolated Tin Nanoparticles".
A microscopic theory for the ubiquitous phenomenon of static friction is presented. Interactions between two surfaces are modeled by an energy penalty that increases exponentially with the degree of surface overlap. The resulting static friction is proportional to load, in accordance with Amontons' laws. However the f…
We have found the equations that determine the self-adjoint extensions, and thus the boundary conditions, of the differential operator used in the multi-band k.p-theory, when the coefficients in the Kane-matrix are piecewise constant. Both the one-dimensional and the three-dimensional case have been investigated. A nu…
The transition from a liquid to a glass in colloidal suspensions of particles interacting through a hard core plus an attractive square-well potential is studied within the mode-coupling-theory framework. When the width of the attractive potential is much shorter than the hard-core diameter, a reentrant behavior of th…
Processes: Technical Textiles Market-An Overview. Technical Fibres. Technical Yarns. Technical Fabric Structure: Woven Fabrics. Knitted Fabrics. Non-woven Fabrics. Technical Textile Finishing. Coating. Colouration. Areas of Application: Heat and Flame Protection. Textile-Reinforced Composite Materials. Waterproof/Brea…
This Account reports the synthesis and characterization of dendrimer-encapsulated metal nanoparticles and their applications to catalysis. These materials are prepared by sequestering metal ions within dendrimers followed by chemical reduction to yield the corresponding zerovalent metal nanoparticle. The size of such…
Optical absorption associated with the one-dimensional joint density of states of an intersubband transition in bismuth nanowires is reported. The previously observed strong absorption in bismuth nanowires at ∼1000 cm−1 is here shown to depend on the wire diameter and on the polarization of the incident light. The abs…