Materials Literature
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Ab initio calculations have been performed to study the electronic structure, phonon dispersion relations, and the electron–phonon interaction for cubic superconductors MgXNi 3 with X = B, C and N. The electronic calculations are based upon the application of a plane wave basis, ultrasoft pseudopotentials, and the loc…
Using the full potential linearized augmented plane wave ab initio method, we investigate bulk magnetic properties of Sr2XMoO6 (X = Fe, Co) double perovskites by comparing the results obtained with the generalized gradient approximation (GGA) and GGA+U methods in order to discuss their magnetic configuration in relati…
Bimetallic oxalate complexes have been successfully inserted into layered double hydroxides as ferromagnetic oxalate-bridged oligomers. Different preparation methods afford different sizes and compositions for the oligomers. In all cases, no magnetic ordering has been observed above 2 K.
Summary: Propene-based random copolymers, synthesized with two isospecific methylaluminoxane-activated ansa-zirconocenes and containing even and odd carbon-numbered higher 1-olefins, were investigated by DSC and WAXD. Nature and amount of co-units affect primary and secondary crystallization as well as melting behavio…
Crown-shaped platinum nanoparticles were synthesized by UV irradiation in the presence of G4-NH2 PAMAM dendrimers in water. Aggregates of the dendrimers, which were formed in the aqueous solution, served as templates for the formation of such nonspherical nanoparticles. This is the first report on the preparation of s…
The using of layer-by-layer assembly polyelectrolyte (PE) films has been suggested as a new versatile technique for surface modification aimed at tissue engineering and cell-based chips. In this study, we investigated the surface morphology of the hyaluronic acid (HA)-based PE films deposited on the amino-functionaliz…
For sufficiently slow rates of strain, flowing foam can exhibit inhomogeneous flows. The nature of these flows is an area of active study in both two-dimensional model foams and three dimensional foam. Recent work in three-dimensional foam has identified three distinct regimes of flow [S. Rodts, J. C. Baudez, and P. C…
Abstract Summary: A protection‐graft‐deprotection method was developed to prepare chitosan‐ g ‐polycaprolactone graft copolymers, during which the ring‐opening copolymerization of ε ‐caprolactone onto phthaloylchitosan (PHCS) happened without any additional catalysis. The intermediate PHCS was introduced primarily to…
To study the origin of the magnetic transition in $\mathrm{Ba}\mathrm{V}{\mathrm{S}}_{3}$, we measured the dc magnetization on ${\mathrm{La}}_{0.1}{\mathrm{Ba}}_{0.9}\mathrm{V}{\mathrm{S}}_{3}$ sintered samples near the ferromagnetic transition. Effective critical exponents and amplitudes are obtained by means of stan…
The general aim of this study is to test the reliability of polarizable model potentials for the prediction of vibrational (infrared and Raman) spectra in highly anharmonic systems such as high temperature crystalline phases. By using an ab initio parametrized interatomic potential for SiO2 and molecular dynamics simu…
We study dense colloidal crystals under oscillatory shear using a confocal microscope. At large strains the crystals yield and the suspensions form shear bands. The pure harmonic response exhibited by the suspension rules out the applicability of nonlinear rheology models typically used to describe shear banding in ot…
We report a new approach to produce macroporous ( approximately 110 nm in diameter) ordered siliceous foams (MOSF) by using block copolymers as templates in the absence of any organic cosolvent. The fine three-dimensional honeycomb structure of MOSF was determined by electron tomography. A formation mechanism of MOSF…
Broadband isothermal dielectric relaxation measurements of anhydrous fructose, glucose, galactose, sorbose, and ribose were made at ambient pressure in their liquidus and glassy states. We found a new secondary relaxation in fructose and glucose that is slower than those seen before by others. This new secondary relax…
We investigated the dielectric functions $\stackrel{\fontencoding{LECO}\selectfont\char177{}}{\ensuremath{\epsilon}}(\ensuremath{\omega})$ of Ir, Ru, Pt, and ${\mathrm{IrO}}_{2}$, which are commonly used as electrodes in ferroelectric thin-film applications. In particular, we investigated the contributions from bound…
Abstract Summary: An ultrasonic irradiation assisted polymerization method has been used to prepare PANI nanotubes and nanofibers by using different doping concentrations of mineral or organic acids. It has been found that PANI nanotubes can be produced when the concentration of the dopant acid is low. However, PANI n…
We have prepared uniform films of chitosan with thicknesses 20 nm < h < 200 nm by spincoating solutions of chitosan dissolved in dilute acetic acid onto silicon substrates while controlling the spin speed and the relative humidity inside the spincoater. After neutralizing the films, they readily absorbed water in the…
Shape-, size-, and phase-controlled ZnSe nanostructures were synthesized by thermolysis of zinc acetate and selenourea using liganding solvents of octadecylamine (ODA) and trioctylphosphineoxide (TOPO) at different molar ratios. Materials synthesized in pure ODA resulted in uniform ultranarrow nanorods and nanowires o…
A well-defined, double-hydrophilic diblock copolymer comprising poly[2-(methacryloyloxy)ethyl phosphorylcholine]-block-(glycerol monomethacrylate) (PMPC30-PGMA30, where the numbers represent the average degrees of polymerization for each block) was evaluated for the synthesis of colloidally stable ultrafine magnetite…
Carbon nanotubes, graphite and amorphous carbon are structurally different, which is reflected in their reactivity and the resistance to oxidation. This paper reports the stability of single- and multi-walled nanotubes, and their true oxidation rates based on conversion to CO2 when heated in the presence of oxygen. No…
Syntheses, spectroscopic, electrochemical, and third-order nonlinear optical susceptibilities of a series of 22pi smaragdyrins and their corresponding Rh(I) derivatives bearing phenylacetylene substituents and ferrocene-containing substituents are reported. The synthetic strategy involved a [3 + 2] acid-catalyzed oxid…