Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFacile Control of Chiral Packing in Poly(p-phenylenevinylene) Spin-Cast FilmsAndrew Satrijo and Timothy M. SwagerView Author Information Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139…
Nanocrystalline apatites exhibit a very fragile structured hydrated surface layer which is only observed in aqueous media. This surface layer contains mobile ionic species which can be easily exchanged with ions from the surrounding fluids. Although the precise structure of this surface layer is still unknown, it pres…
Cadmium sulfide and cadmium selenide/cadmium sulfide core/shell nanoparticles stabilized with poly(cysteine acrylamide) have been bound to polystyrene (PS) latexes by three methods. First, anionic 5 nm diameter CdS particles were electrostatically attached to 130 nm surfactant-free cationic PS latexes to form stable d…
We demonstrate from our current-sensing atomic force microscopic studies that both electrical and topographical properties of electrochemically prepared polyaniline (PAn) films are affected by their preparation conditions. The electrical properties of the fully doped PAn films prepared in 0.30 M nitric acid with its p…
In this paper, we report a synthesis strategy for a new class of hollow, curved carbon morphologies, 'carbon microtubes' (CMTs), with absolute control over their conical angles and internal diameters. Our synthesis methodology employs nitrogen or oxygen dosing to change the wetting behaviour of gallium metal with the…
Abstract The possibility of poly(vinyl chloride) (PVC) plasticization and modification by regenerated PVC/polyurethane (PU) blends (PVC/PU R ), obtained after partial thermochemical destruction of the PU foam‐backed PVC‐sheet (soundproof materials waste), has been studied. The partial thermochemical destruction of the…
Abstract High‐density polyethylene (HDPE) was blended with “reinforcing” cycloolefin copolymer (COC) in order to produce polyolefin materials with increased stiffness, yield and tensile strength. Experimental data on tensile modulus E b , creep modulus E bcr , storage modulus E b ′, loss modulus E b ″, yield strength…
Synergisms between different species emerging from hydrocarbon plasmas can enhance the chemisorption of radicals at the surface of a growing film. It has been shown that the rate of CH3 chemisorption can be increased by a simultaneously incident flux of ions or H atoms; the latter species cause the formation of surfac…
A hybrid reverse Monte Carlo (HRMC) algorithm, which incorporates both experimental and energy based constraints, is applied to investigate the microstructure of two disordered carbons of vastly different densities and bonding. We have developed a novel liquid quench procedure which in combination with the HRMC algori…
The combined use of a pore-forming amphiphile, 1 (derived from lysine, cholic acid, and spermine), and thermally sensitive liposomes (made from 1,2-dipalmitoyl-sn-glycero-3-phosphocholine, DPPC) to create "thermally gated liposomes" (TGLs) has been demonstrated. Thus, at temperatures that lie above the gel to liquid-c…
We have developed a method for stabilization of the uniform lying helix (ULH) texture of short pitch cholesterics in an electro-optical device, based on the flexoelectro-optic effect in such a texture. By using a small concentration of photoreactive liquid crystal monomer (less than 5wt.%) and selecting the illuminati…
The resonance behavior and the dispersion of the ${\mathrm{G}}^{\ensuremath{'}}$ line in double-wall carbon nanotubes were investigated by multifrequency Raman scattering. Using a large number of laser lines for excitation, the dispersion for the response from the inner tubes and from the outer tubes was found to be 8…
Goos-Hänchen shifts are investigated when total reflection occurs at the interfaces associated with single-negative materials (SNMs). A general rule for judging the direction of the Goos-Hänchen lateral shift concerning lossless media is obtained: Whether the lateral shift is positive or negative depends on the sign o…
The Ge2Sb2Te5 thin films deposited by a sputtering method on SiO2∕Si substrates were annealed through a rapid thermal annealing process and performed a high-resolution transmission electron microscopy study in order to investigate the atomic arrangement of the metastable Ge2Sb2Te5. The metastable rocksalt structure ha…
We propose a technique for calculating the color separation gratings aimed at separating plane light beams of different wavelengths into different diffraction orders. The technique is based on a special-type optimization criterion. With this criterion, the problem of calculating the piecewise-constant grating profile…
The first in situ measurements with scanning transmission X-ray microscopy (STXM) of an active electrochemical cell are reported. An electrochemical wet cell, consisting of an electrodeposited polyaniline thin film on a thin Au film covered by an overlayer of 1 M HCl solution sitting between two X-ray transparent sili…
We present high-resolution valence band and core level spectra of silver for photoelectron kinetic energies up to 8 keV. At these kinetic energies we estimate a surface contribution of less than 3%. Taking advantage of the favourable sp/d relative cross-sections, a comparison with the calculated density of states is p…
A thin-film optical filter used as a one-dimensional spatial filter is presented, and its design is briefly examined. The filter consists of a stack of quarter-wave dielectric layers upon a right-angle prism that selectively cancel a reflected or transmitted plane-wave front for various angles of incidence. Transmitta…
In the present study, we report the chemical vapor deposition (CVD) of nitrogen-doped (N-doped) aligned carbon nanotubes on a silicon (Si) substrate using ferrocene (Fe(C5H5)2) as catalyst and acetonitrile (CH3CN) as the carbon source. The effect of experimental conditions such as temperature, gaseous environment, and…
The new nonlinear optical crystal Y x La y Sc z (BO 3 ) 4 ( x + y + z = 4) has been discovered. Phase boundaries have been established in the determination of the x, y, z composition parameters that define the existence region of the trigonal huntite-type structure. From single-crystal X-ray diffraction measurements,…