Materials Literature
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A combined enzymatic, chemical, and analytical approach was used to determine the cross-sectional carbohydrate composition in cellulosic fibers. The outer surface of cellulosic fibers was enzymatically removed layer-by-layer with precise quantitative control, and the monosaccharides in the peelings were subsequently a…
The physical aging of low water content, amorphous starch/water, maltodextrin/water, and maltose/water mixtures in the glassy state was examined using mechanical testing and calorimetry. Stress relaxation measurements showed that upon storage of the glassy materials there was a time-dependent increase in both flexural…
The tangential $G$ band in the Raman spectra of a metallic single-wall carbon nanotube shows two peaks: a higher frequency component having the Lorentzian shape and a lower-frequency component of lower intensity with a Breit-Wigner-Fano (BWF) type of line shape. This interesting feature has been analyzed on the basis…
Effective electromagnetic properties of negative index of refraction metamaterials (NIMs) can be hard to measure. We show through simulations that electromagnetic fields inside a typical, physically realizable wire-SRR (split ring resonator) NIM are more homogeneous than one might expect inside such metamaterials, and…
We calculate the statistical properties of the energy landscape of a minimal model for strong network-forming liquids. Dynamic and thermodynamic properties of this model can be computed with arbitrary precision even at low temperatures. A degenerate disordered ground state and logarithmic statistics for the local mini…
The A‐site cation diffusion in LaFeO 3 has been examined by inter‐diffusion experiments between LaFeO 3 and NdFeO 3 . Dense, polycrystalline bodies were annealed in contact at temperatures between 1100° and 1300°C in ambient air. The bulk‐ and grain‐boundary inter‐diffusion coefficients were calculated from concentrat…
With appropriate choice of conditions, copolymerization of monosubstituted monomers [CH 2 CHX: e.g., styrene, butyl acrylate (BA)] in the presence of small amounts of an α-methylvinyl monomer [CH 2 C(CH 3 )Y: e.g., α-methylstyrene (AMS), methyl methacrylate (MMA), methacrylonitrile (MAN)] and a cobaloxime as chain tra…
Thermionic field emission properties of nitrogen doped ultrananocrystalline diamond (UNCD) coated silicon tip arrays are examined using thermionic field emission electron microscopy (TFEEM). Nitrogen doping has been shown to enhance the emission properties of diamond by the introduction of a donor level $1.7\phantom{\…
We investigate the thermal conductivity of classical spin chains through a Green-Kubo approach using both Monte Carlo and Langevin simulations as well as by direct numerical determination of the microscopic heat transfer processes. All three approaches show that magnetic heat conductivity is normal for all finite temp…
Abstract In this study, bulk polymerized clay‐tethered thermoplastic polyurethane (TPU) composites were synthesized that offered much improved tensile strength with negligible changes in tensile modulus. These composites contained intercalated, tethered layered silicate particles and were synthesized by mixing low mol…
Abstract Liquid crystalline epoxy/polyaniline (LCE/PANI) composite nanowires have been fabricated using an anodic aluminum oxide (AAO) membrane by a temperature‐gradient curing process. PANI nanorods with an average diameter of 30 nm have been synthesized by dispersion polymerization in order to employ them as a curin…
The Langmuir film balance technique was used to determine the hydrolytic kinetics of monolayers of the stereocomplex formed from mixtures of enantiomeric polylactides, poly(L-lactide) (L-PLA) and poly(D-lactide) (D-PLA), spread at the air-water interface. The present study investigated parameters such as degradation m…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Maleic Anhydride Grafted Polypropylene with High Molecular Weight Using Borane/O2 Radical Initiator and Commercial PP PolymersZ. M. Wang, H. Hong, and T. C. ChungView Author Information Department of Materials Science a…
Both end-functionalized (alpha-bromo and omega-carboxy) compounds were first tested for the radical reaction on the silicon-hydride (Si-H) terminated porous silicon (PSi) with/without the presence of diacyl peroxide initiator under microwave irradiation. Then the carboxylic acid monolayers (CAMs) assembled on PSi thro…
Abstract A polylactide of high optical purity was crystallized between 100 and 140 °C, in‐between two glass slides, and its morphology was investigated by polarizing optical microscopy, scanning electron microscopy, and atomic force microscopy, during subsequent heating and cooling cycles between −15 °C and the crysta…
Despite widespread use for more than two decades, the SERS phenomenon has defied accurate physical and chemical explanation. The relative contributions from electronic and chemical mechanisms are difficult to quantify and are often not reproduced under nominally similar experimental conditions. This work has used elec…
Blends of poly( dl -lactide) (PDLLA) with poly(vinylphenol) (PVPh), obtained by solvent-casting and solution/precipitation, have been studied by DSC and FTIR. DSC results obtained in the first heating scan suggest that as-prepared blends are phase separated in nearly pure components. In addition, the initial FTIR spec…
Aluminum nitride (AlN) powders were synthesized by gas reduction–nitridation of γ‐Al 2 O 3 using NH 3 and C 3 H 8 as the reactant gases. AlN was identified in the products synthesized at 1100°–1400°C for 120 min in the NH 3 –C 3 H 8 gas flow confirming that AlN can be formed by the gas reduction–nitridation of γ‐Al 2…
It has long been a puzzle that the Raman optical modes shift to lower frequency (or termed optical mode softening or redshift) associated with the creation of Raman acoustic modes that shift to higher energy (or called acoustic hardening or blueshift) upon a nanosolid being formed and its size being reduced. Understan…
Two‐dimensional computer simulations of ferroelectric polarization switching have been performed using the phase field simulation model developed by employing the time‐dependent Ginsburg–Landau equations. The bulk‐free energy, polarization gradient energy, long‐range dipole–dipole electrostatic interactions, and elast…