New Mn12 single-molecule magnets from edge-sharing bioctahedra
Dodecanuclear Mn clusters based on edge-sharing bioctahedra display the scan-rate- and temperature-dependent hysteresis loops that are indicative of single-molecule magnetism behaviour.
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One-step method for the self-assembly of metal nanoparticles onto facetted hollow silica tubes
An optimized synthetic approach has been developed for the exclusive formation of facetted silica tubes using a simple organic molecule i.e. ammonium tartrate as a template. The synergy of two phenomena: (a) aggregation of ammonium tartrate and (b) interaction of a hydrolysed TEOS intermediate with the ammonium tartra…
The Effect of Plasma Chemistry on the Damage Induced to Porous SiCOH Dielectrics
The scope of this study was to compare the plasma damage produced on porous dielectrics by different chemistries under identical plasma conditions and evaluate different techniques for characterization of the damage. We have investigated the effects of He + H 2 , N 2 + H 2 , and N H 3 plasmas on the properties of thre…
A chirality-induced alpha phase and a novel molecular magnetic metal in the BEDT-TTF/tris(croconate)ferrate( iii ) hybrid molecular system
The novel paramagnetic and chiral anion [Fe(C5O5)3]3- has been combined with the organic donor BEDT-TTF (= ET = bis(ethylenedithio)tetrathiafulvalene) to yield the first chirality-induced alpha phase and a paramagnetic metal.
Structural observation of photochromism
The reversible formation of a long-lived, coloured F-centre has been observed in small structural changes delineated by neutron diffraction.
Feasibility study for reconstruction of information from near field observations of the magnetic field of laser printer
We measured leaked electromagnetic radiation that came from a laser printer. Using the measured data, we were able to easily reconstruct the printed image. To avoid unwanted monitoring, we have to prevent the printed image data from being reconstructed. In this paper, we first measured the magnetic field at a near fie…
Interface effects in highly oriented films of the Heusler alloy Co2MnSi on GaAs(001)
Highly (001) oriented thin films of Co2MnSi have been grown on lattice-matched GaAs(001) without a buffer layer. Stoichiometric films grown at the highest substrate temperature of 689 K showed the lowest resistivity (33μΩcm at 4.2 K) and the lowest coercivity (14 Oe). Twofold in-plane magnetic anisotropy was observed…
Looking for high‐energy density compounds among hexaazaadamantane derivatives with CN, NC, and ONO2 groups
Abstract Density functional theory (DFT) was employed to evaluate the heats of formation (HOFs) for hexaazaadamantane (HAA) derivatives with CN, NC, and ONO 2 groups, respectively. This was done by designing isodesmic reactions at the B3LYP/6‐31G* level of theory, where the HAA cage skeletons were kept unbroken to…
The biaxial smectic (SmAb) phase in nonsymmetric liquid crystal dimers comprising two rodlike anisometric segments: an unusual behavior
The first nonsymmetric liquid crystal dimers, possessing salicylaldimine and cyanobiphenyl rodlike anisometric segments, exhibiting the biaxial smectic A (McMillan) phase unequivocally evidenced by microscopic, conoscopic, calorimetric and X-ray diffraction studies is reported.
Thermodynamic Equilibrium of Single-Chamber SOFC Relevant Methane–Air Mixtures
Single-chamber solid oxide fuel cells (SC-SOFCs) rely on the selectivity of the anode and cathode materials for either the partial oxidation reaction of a hydrocarbon with oxygen from air (anode) or the oxygen reduction reaction (cathode). The observed open-circuit voltages (OCVs) of up to measured in SC-SOFCs suggest…
On the fraction of CrII sites involved in the C2H4 polymerization on the Cr/SiO2 Phillips catalyst: a quantification by FTIR spectroscopy
An estimation of the fraction of Cr(II) sites involved in the C(2)H(4) polymerization on a Cr(II)/SiO(2) Phillips catalyst has been obtained by means of in situ alternated CO adsorption and C(2)H(4) polymerization FTIR experiments: about 28% of the total surface sites react fast with C(2)H(4), while a lower fraction,…
Ultrasharp light-scattering resonances of structured nanospheres: effects of size-dependent dielectric functions
Recently, Chen et al. [J. Biomed. Opt. Vol. 10, 024005 (2005)] reported on the concept of multicolor molecular imaging, which uses resonant light-scattering spectroscopy of multilayer nanospheres. They claimed that the resonance scattering peaks of three-layer nanoshells can be designed so that the ultrasharp widths a…
Self-assembly of dendron-helical polypeptide copolymers: organogels and lyotropic liquid crystals
New macromolecular self-assembling building blocks, dendron-helical polypeptide copolymers, have been synthesized; these materials possess a well-defined 3-D shape and self-assemble in solution to form nanoribbon and lyotropic liquid crystalline phases.
Ordered mesoporous silicas as host for the incorporation and aggregation of octanuclear nickel( ii ) single-molecule magnets: a bottom-up approach to new magnetic nanocomposite materials
Silica-based mesoporous materials have been employed as the support host for a suitably designed small octanuclear nickel(II) guest complex with a moderately anisotropic S = 4 ground spin state (D = −0.23 cm−1), which behaves as a single-molecule magnet at low temperature (TB = 3.0 K). Both unimodal MCM-41 and bimodal…
Supramolecular chirality of columnar mesophases consisting of H-bonded complexes of melamine and polycatenar benzoic acids
The present work describes a series of H-bonded complexes consisting of a melamine derivative and polycatenar acids that show columnar liquid crystalline behaviour. Chirality has been transferred from the molecular blocks (either the acids, A3* and A4*, or the melamine, T2*) to the columnar organization. Particular ef…
Distributed Generation Applications of Fuel Cells
Fuel cells (FCs) are static energy conversion devices that convert the chemical energy of fuel directly into DC electrical energy. Among several types of fuel cells, solid oxide fuel cells (SOFC), polymer electrolyte membrane fuel cells (PEMFC) and molten carbonate fuel cells (MCFC) show great promise for distributed…
The study of Spanish clays for their use as sealing materials in nuclear waste repositories: 20 years of progress
This paper is dedicated to Pedro Rivas, a pioneer in the study of some of the issues herein presented and the head of many of the research projects compiled. He has participated intensely in all the described investigations. The useful suggestions and comments from the referees A. Meunier and R. Pusch have improved th…
Luminescence Properties of a Pb[sup 2+] Activated Long-Afterglow Phosphor
Luminescence properties of CdSiO 3 :Pb 2+ long-afterglow phosphor, including photoluminescence, fluorescence lifetime, long-afterglow decay curve, and thermostimulated luminescence spectra, are investigated in this paper. Photoluminescence of the synthesized phosphor shows a single intense Pb 2+ -related broadband emi…
On a Fast Integral Equation Method for Diffraction Gratings
The integral equation method for the simulation of the diffraction by optical gratings is an efficient numerical tool if profile gratings determined by simple cross-section curves are considered. This method in its recent version is capable to tackle profile curves with corners, gratings with thin coated layers, and d…
Polyamide-6/Clay Nanocomposites: A Critical Review
The plastics business is gathering around nanocomposites because of the unusual performance of these materials in some technologically important applications, such as automotive parts, packaging, textiles and flame resistant materials. The use of clay as the reinforcing component of polymers has transformed the proper…