Materials Literature
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We present a facile and reproducible method for synthesizing monodisperse platinum (Pt) spheres with sizes ranging from 10 to 100 nm in diameter and exceptionally small standard deviations of 3% for large spheres. The reaction takes place in aqueous solution using a multistep seed-mediated approach. The Pt nanospheres…
Sea urchin larval spicules transform amorphous calcium carbonate (ACC) into calcite single crystals. The mechanism of transformation is enigmatic: the transforming spicule displays both amorphous and crystalline properties, with no defined crystallization front. Here, we use X-ray photoelectron emission spectromicrosc…
Optical constants (refractive index and extinction coefficient) have been studied for a -(Se 80 Te 20 ) 100− x Ge x ( x = 0, 2, 4, 6) thin films using transmission spectra in the wavelength range 500–2500 nm. It is observed from optical transmission measurements that the optical energy gap ( E g ) increases while the…
Bulk magnetometry and anomalous Hall effect measurements are presented and discussed, for rare earth (RE)--transition metal compound superlattices, grown by molecular beam epitaxy. The results are complemented with modeled hysteresis curves. It is found that there is good agreement between the anomalous Hall effect an…
The interfacial properties of polymer dispersed liquid crystal (PDLC) gratings influenced by partial matrix fluorination are studied through molecular dynamics methods. The miscibility between the fluorine-substituted monomer and other materials in the prepolymer mixture is evaluated by using the solubility parameters…
Abstract Solid oxide fuel cells (SOFC) are a promising technology for distributed electricity generation and cogeneration. Numerous papers have been published in the past several years proposing mathematical/computational fluid dynamics (CFD) models for predicting the transient and steady-state performance of such cel…
Abstract The modeling of the cure kinetics is widely used to predict the progress of the chemical reaction during processing of thermosetting resins. In this study, a new technique named the “ Isoconversion Map ” is proposed to predict thermoset curing from a series of differential scanning calorimetry (DSC) analyses.…
Abstract Available literature data on aggregation kinetics of crystals of a number of salts during their bulk crystallization from solutions have been analysed. The proposed earlier mechanism of aggregation and intergrowth of crystals during bulk crystallization owing to formation of nucleus‐bridges between crystals w…
The present work combines periodic density functional theory (DFT) calculations of thermodynamic properties and experimental synthesis to explore the ternary (Li, Na, K) phase diagram of Li x Na y K 3− x − y AlH 6 hexa-alanates. About 70 virtual phases, of various possible structures and different alkali metal composi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEvidence of Lateral Nanoscale Heterogeneities in Weak Polyelectrolyte BrushesKevin N. Witte†, Jaehyun Hur†, Wei Sun, Sangtae Kim, and You-Yeon Won*View Author Information School of Chemical Engineering, Purdue University, West Lafay…
Eutectic melt solidification is shown to avoid cracking during solidification by quenching an amorphous phase. Subsequent annealing results in micro/nanostructure ceramics. This strategy has been applied to HfO 2 –Al 2 O 3 –GdAlO 3 and Y 2 O 3 –CaO–Al 2 O 3 ternary systems that have deep eutectics. In most cases, cera…
A simple triblock copolymer, mPEG750-aniline pentamer-mPEG750, was prepared by condensation polymerization. The solubility of aniline pentamer in this kind of copolymer was improved in common solvents especially in aqueous solution, and the electroactivity of this copolymer was confirmed by UV-vis and CV in aqueous so…
This article contains an in-depth study of the kinetics of O 2 desorption from preoxidized size-selected gold nanoparticles (NPs) of average size ∼1.5 and ∼5 nm synthesized by micelle encapsulation and supported on SiO 2 . Thanks to the narrow NP size distributions achieved using our preparation route, information on…
Functionalization of single-walled carbon nanotubes through cycloaddition reactions constitutes an effective route to obtain novel nanostructured materials with interesting properties. In this paper, we perform density functional theory calculations on Diels-Alder reactions at the sidewall of armchair, zigzag and chir…
Abstract The influences of intensity of ultraviolet (UV) light, light‐barrier property of packaging film on the fat photo‐oxidation and accelerated shelf life of cookies were studied. Unpacked cookies were stored at a temperature of 408C and a relative humidity (RH) of 50% for 10 to 65 days, with an intensity of the U…
Abstract The effects of electron beam irradiation on backyard composting behaviour of polylactic acid (PLA) polymer were evaluated. Samples (10 mm 2 × 0.75 mm) from thermoformed PLA drinking cups were exposed to 10 MeV electron beam irradiation at doses of 0, 72, 144 and 216 kGy. Irradiated PLA samples were placed in…
We have measured the resistivity of PrFeAsO 1− x F y samples over a wide range of temperature in order to elucidate the role of electron–phonon interaction on normal- and superconducting-state properties. The linear T dependence of ρ above 170 K followed by a saturation-like behavior at higher temperature is a clear s…
The formation of hydrogen-bonded interpolymer complexes between poly(acrylic acid) and poly(N-vinyl pyrrolidone) as well as amphiphilic copolymers of N-vinyl pyrrolidone with vinyl propyl ether has been studied in aqueous and organic solutions. It was demonstrated that introduction of vinyl propyl ether units into the…
Abstract Neutron powder diffraction patterns were recorded on CaMn 1‐x Cu x O 3 (x = 0 and 0.20) compounds at different temperatures down to 11K. All the patterns were analyzed by employing Rietveld refinement technique and using the Fullprof program. The observed crystallographic peaks could be refined by using Pbnm…
The effects of various reaction conditions including temperature (200−240 °C), pressure (20−50 bar), and H 2 /CO molar feed ratio (1−2) on the performance of the liquid-phase direct dimethyl ether (DME) synthesis from syngas, over a bifunctional catalyst (CuO/ZnO/Al 2 O 3 + H-ZSM-5) have been studied. The experiments…