Materials Literature
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The effects of floppy modes in the thermodynamical properties of a system are studied. From thermodynamical arguments, we deduce that floppy modes are not at zero frequency and thus a modified Debye model is used to take into account this effect. The model predicts a deviation from the Debye law at low temperatures. T…
Lattice parameters of the orthorhombic perovskites $RM{\mathrm{O}}_{3}$ ( $R=\mathrm{\text{rare}}$ earth, $M=\mathrm{T}\mathrm{i}$, V, \dots{}, Ni, and Ga) have been simulated based on the ionic $M\mathrm{\text{\ensuremath{-}}}\mathrm{O}$ bond length and rigid $M{\mathrm{O}}_{6/2}$ octahedra. Comparison with experimen…
We report scanning tunneling microscopy observations of Ge deposited on the Si(111)-7x7 surface for a sequence of sub-monolayer coverages. We demonstrate that Ge atoms replace so-called Si adatoms. Initially, the replacements are random, but distinct patterns emerge and evolve with increasing coverage, till small isla…
A phenomenological model for the asymmetric giant magnetoimpedance (GMI) in field-annealed amorphous ribbons is developed. The effect of a surface crystalline layer on the GMI response is described in terms of an effective bias field appearing due to a coupling between the crystalline layer and amorphous phase. It is…
What makes inert gold active? The answer lies in controlling the structure of Au particles at the nanoscale: Either many interface sites or many low-coordinate Au atoms need to be present in the particles. This principle is demonstrated by modeling the oxidation of CO on a rutile (TiO2)-supported Au nanocluster, the t…
Recently the authors discovered that the suppression of the charge density wave (CDW) ground states by high magnetic fields in the organic conductor series Per2M(mnt)2 is followed by additional high field, CDW-like phases. The purpose of this presentation is to review these compounds, to consider the relevant paramete…
Layering in polyelectrolyte multilayer films has been studied by neutral impact collision ion scattering spectroscopy. The method affords a direct look at vertical ordering within these films at the nanometer scale. By labeling certain polyelectrolyte layers with heavy atom (Ru) probes, sufficient contrast has been ob…
Mössbauer spectroscopy of tin and iron has been used to probe silicate glasses. The research was motivated by the need to understand the structure and behaviour of float glass when tin diffuses into the surface during manufacture. Iron is also present in small quantities as it is an impurity in the sand from which the…
This paper describes the first use of polymer-coated quantum dots (QDs) as fluorescent tracers for LSCFM imaging of phase morphology in polymer blends. Cadmium sulfide (CdS) QDs stabilized at the surface with a PS-b-PAA block copolymer are shown to be well dispersed via their polystyrene (PS) brush layer in the PS pha…
We report the preparation of a novel type of mesoporous silica of the MSU-type family. This material was prepared with Pluronic P123 copolymer in mild acidity according to a two-step process. Its structure was explored by X-ray diffraction, N2 isotherms, SEM and TEM. The TEM study was completed by a 3D tomography anal…
We report the preparation of a new class of copolymer films that consist of polymethylene (PM) with a low percentage ( approximately 1-4%) of randomly distributed ethyl ester side groups, consistent with poly(methylene-co-ethyl acetate). The films are prepared through a surface-catalyzed polymerization on gold surface…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCopolymerization of ll-Lactide at Its Living Polymer−Monomer Equilibrium with ε-Caprolactone as ComonomerJaroslav Mosnáček, Andrzej Duda, Jan Libiszowski, and Stanislaw PenczekView Author Information Department of Polymer Chemistry,…
Abstract This paper deals with the cationic ring-opening polymerization of γ-thiobutyrolactone (2) and γ-thionobutyrolactone (3). The ring-opening polymerization of 3 was carried out in bulk at 100 °C for 2 h by various cationic initiators. Scandium trifuoromethane-sulfonate induced the polymerization of 3, which did…
Attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy was used to study the adsorption of charged silica particles onto TiO(2) particles coated with anionic sodium polyacrylate (NaPA) or cationic poly(diallyldimethylammonium) chloride (PDADMAC). To the best of our knowledge, this is the first…
Abstract A high surface area ruthenium dioxide with partial ordered structure has been replicated by cubic Ia3d mesoporous silica, and the replica shows high catalytic activity for the oxidation of CO to CO2 at relatively low temperature.
Strontium bismuth tantalate (SBT) thin films containing Sr defect and Bi excess have been prepared by chemical solution deposition onto spontaneously oxidized Si(100) substrates with two different heterostructure electrodes: Pt/TiO 2 and Ti/Pt/Ti. Layered perovskite SBT films were crystallized in oxygen by rapid therm…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Diblock Copolymers Consisting of Hyaluronan and Poly(2-ethyl-2-oxazoline)Yali Yang, Kazunori Kataoka, and Françoise M. WinnikView Author Information Faculty of Pharmacy and Department of Chemistry, Université de Montréa…
Films of liquid crystalline copoly(methacrylate)s with photochromic azobenzene and benzanilide side groups and related terpolymers with additional dye side groups were oriented by the irradiation with linearly polarized visible or, alternatively, UV light. The orientational behaviors of the terpolymers with benzoxazol…
Frequency-scanned excitation profiles of coherent second harmonic generation (SHG) were measured for silver nanoparticle arrays prepared by nanosphere lithography. The frequency of the fundamental beam did not coincide with the localized surface plasmon resonance (LSPR) of the nanoparticles and was tuned so that the c…
Crystal structures and phase transitions in ferromagnetic shape memory alloys based on Co–Ni–Al and Co–Ni–Ga, Brown, P J, Ishida, K, Kainuma, R, Kanomata, T, Neumann, K-U, Oikawa, K, Ouladdiaf, B, Ziebeck, K R A