Materials Literature
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Metastable κ-Al2O3 was produced by thermal treatment of γ-Al2O3 and then Ni catalysts were prepared on both κ-Al2O3 and γ-Al2O3. Catalysts containing both low (5 wt.%) and high (20 wt.%) amounts of Ni were tested for activity towards toluene hydrogenation and characterized with X-ray diffraction, temperature-programme…
A graphene wireless sensor concept is described. By utilizing thin gate dielectrics, the capacitance in a metal-insulator-graphene structure varies with charge concentration through the quantum capacitance effect. Simulations using realistic structural and transport parameters predict quality factors, Q, >60 at…
Abstract The response of synthesized shape memory segmented polyurethanes (PUs) was affected by the addition of cellulose nanocrystals, as well as by the various conditions selected to carry out thermomechanical cyclic tests. The PUs were synthesized from an α‐hydro‐ω‐hydroxy‐poly(ethylene oxide), tolylene‐2,4‐diisocy…
Using event-driven molecular dynamics simulations, we quantify how the self diffusivity of confined hard-sphere fluids depends on the nature of the confining boundaries. We explore systems with featureless confining boundaries that treat particle-boundary collisions in different ways and also various types of physical…
The standard way to find the orbital occupation of Jahn-Teller (JT) ions is to use structural data, with the assumption of a one-to-one correspondence between the orbital occupation and the associated JT distortion, e.g., in O${}_{6}$ octahedron. We show, however, that this approach can be incorrect, e.g., for layered…
This work characterizes the adsorption, structure, and binding mechanism of oxygenated organic species from cyclohexane solution at the liquid/solid interface of optically flat alumina-supported palladium nanoparticle surfaces prepared by atomic layer deposition (ALD). The surface-specific nonlinear optical vibrationa…
In this article, we report the detailed spectroscopic studies of high Er3+content (50%) transparent YAG ceramic co-doped with nominal Cr3+ content (0.1 mol %). Various radiative and non-radiative spectroscopic properties such as radiative decay time, fluorescence branching ratio, emission/absorption cross sections, in…
ZnO assembled hexagonal or porous rectangular plates were synthesized from the decomposition of a new precursor, ammonium zinc nitrate hydroxide (NH4Zn3(OH)6NO3), through a facile solvothermal route assisted by Poly(styrene sulfonic acid) sodium salt (PSS). XRD, BET surface area measurements, SEM, HRTEM and TG-DSC wer…
We successfully synthesized the new intermetallic compound Gd(5)Ni(19) and determined its crystal structure by X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM). The structure is a Sm(5)Co(19)-type superlattice structure (2H, space group P6(3)/mmc), and the lattice parameters were determined…
We investigate the waveguiding properties of a planar metamaterial slab using terahertz time-domain attenuated total reflection spectroscopy. The enhancement of evanescent waves is observed for transverse electric and transverse magnetic excitation and is caused by resonant excitation of waveguide modes in the slab. O…
The electrodynamics of a one-dimensional split-ring resonator (SRR) based nonlinear metamaterial is studied. The metamaterial is a one-dimensional periodic array of weakly coupled SRRs, with each SRR represented by a nonlinear resistor-inductor-capacitor (RLC) equivalent resonator circuit. Nonlinearity is introduced i…
Single-phase epitaxial La 0.7 Sr 0.3 MnO 3 (LSMO) thin films with significantly enhanced low-field magnetoresistance (LFMR) properties (23% at 20 K) are demonstrated in this work. The LSMO films on SrTiO 3 (001) substrates exhibit tilted and well-aligned nanocolumn structure achieved by pulsed laser oblique-angle depo…
An enhanced valence force field model for zinc-blende crystals is developed to provide a unified description of the isothermal static and dynamical lattice properties of gallium arsenide. The expression for the lattice energy includes a second-nearest-neighbor coplanar interaction term, the Coulomb interaction between…
Water-dispersible and fluorescent core–shell nanorods (NRs) consisting of covalently linked poly(allyamine hydrochloride)-pyrene (PAH-Py) were synthesized and used for fabricating hybrid organic–inorganic NRs. The reaction between 1-pyrenecarboxaldehyde (Py-CHO) nanorods and PAH was driven by Schiff base formation and…
We performed inelastic neutron scattering on a powder sample of iron-based superconductor BaFe${}_{2}$(As${}_{0.65}$P${}_{0.35}$)${}_{2}$ with ${T}_{c}=30$ K. Although this system is expected to have line nodes in its superconducting order parameter, we have observed spin resonance at the same scattering vector as tha…
A new method of surface modification based on the “grafting from” polymerization process enabled to prepare original silica nanoparticles covered with PDVF “hair”. This strategy involved two steps: (i) the radical addition of 1,4-diiodoperfluorobutane initiated by tert -butylperoxypivalate onto the double bonds of sil…
Abstract Two‐step process that allows controlling independently roughness and chemical composition of plasma polymers, i.e., two parameters determining the wettability of such materials, is presented. In the first step a film composed of Ti nano‐clusters is deposited on a smooth substrate. Nano‐cluster films of differ…
Abstract In this study, metal‐polymer particles with microphase‐separated structures were prepared by self‐organized precipitation, where a good solvent is evaporated from a solution that also contains block copolymer, Au NPs, and a poor solvent. Control of the microphase‐separated structure in composite particles con…
Abstract Nanoparticles in a flexible polymer melt film often segregate to the substrate due to attractive depletion interactions between the nanoparticles and the substrate. Here, molecular dynamics simulations are performed to study the effect of chain stiffness on this segregation. The nanoparticles are modeled as s…
Abstract Optically clear silicone/epoxy hybrid resins were synthesized. The silicone resin (SiR) carrying SiH, SiCHCH 2 and SiOH groups was prepared by hydrolytic condensation. The blends of SiR and diglycidyl ether of hydrogenated bisphenol A (DGEHBA) were cured through platinum‐catalyzed hydrosilylation and alum…