Materials Literature
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This pilot study provides the proof of principle for biomedical application of novel polyelectrolyte complexes (PECs) obtained via electrostatic interactions between dextran sulphate (DXS) and poly(allylamine hydrochloride) (PAH). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed that DXS/PAH…
Abstract Elastomeric EPDM fibers with diameters of 200–400 nm are prepared by coaxial electrospinning of PVP/EPDM fibers, subsequent vulcanization of the polymers and finally removal of the outer PVP layer using ethanol. The initially applied PVP layer restricts the elastic recovery of the EPDM fibers. The crosslinkin…
Abstract Magnetic organosilica nanoparticles are synthesized by grafting MPB‐POSS/MMA‐based block copolymers from magnetic iron nanoparticles via surface‐initiated ATRP. The hybrid nanoparticles consist of a magnetic iron core and a PMMA/POSS composite shell. A small amount of the nanoparticles is added as “smart addi…
The pure rotational spectra of 18 and 21 isotopic species of GeSe and GeTe have been measured in the frequency range 5-24 GHz using a Fabry-Pérot-type resonator pulsed-jet Fourier-transform microwave spectrometer. Gaseous samples of both chalcogenides were prepared by a combined dc discharge/laser ablation technique a…
It is recognized that the conventional model for metal-ferroelectric-insulator-semiconductor field-effect transistors (MFIS-FETs) always neglects the history-dependent electric field effect of the ferroelectric layer. In this paper, an improved model combining the dipole switching theory with the silicon physics of me…
Presented are the experimental results of two light activated shape memory polymer (LASMP) formulations. The optical stimulus used to activate the materials is detailed including a mapping of the spatial optical intensity at the surface of the sample. From this, results of energy calculations are presented including t…
Hybrid nanobeads containing either a manganese-oxo or manganese-iron-oxo cluster have been prepared via the miniemulsion polymerization technique. Two new ligand substituted oxo clusters, Mn(12)O(12)(VBA)(16)(H(2)O)(4) and Mn(8)Fe(4)O(12)(VBA)(16)(H(2)O)(4) (where VBA = 4-vinylbenzoate), have been prepared and charact…
Polyelectrolyte complexes (PECs) were prepared by structural uniform and strongly charged cationic and anionic modified alternating maleic anhydride copolymers. The hydrophobicity of the polyelectrolytes was changed by the comonomers (ethylene, isobutylene and styrene). Additionally, the n−/n+ ratio of the molar charg…
Following previous work [G. Odriozola and F. de J. Guevara-Rodríguez, J. Chem. Phys. 134, 201103 (2011)], the replica exchange Monte Carlo technique is used to produce the equation of state of hard 1:5 aspect-ratio oblate ellipsoids for a wide density range. Here, in addition to the analytical approximation of the ove…
Abstract By use of dissipative particle dynamics (DPD) symmetric mictoarm star polymers with four arms and the degenerated case of a linear diblock copolymer (consisting of moderately hostile monomers) are simulated in a selective solvent for concentrations reaching from high dilution to the solvent free bulk. They ar…
Bismuth telluride (Bi2Te3) and its alloys are the most commonly used materials for thermoelectric devices. In this paper, the fluxless bonding process was developed to bond Bi2Te3chips to alumina substrates for high temperature applications. The silver-indium (Ag-In) system was chosen for the process development. To w…
Abstract Pulse electric current sintering is used to prepare a compact from resinificated hydrous silk powder. Compacts with no remnant silk powders are formed with 20 wt% added water, 20–40 MPa molding pressure, and >353 K molding temperature. The latter two are much lower than those used for conventional hot pres…
Scaffolds made from poly(3-hydroxybutyrate) were prepared by thermally induced phase separation from solutions in dioxane at temperatures above (23°C) or below the freezing point of the solvent. At 23°C, gelation occured with nano-fibrous network formation. The scaffolds prepared at —12°C and —25°C exhibited a highly…
A simplified model is used to construct the magnetic phase diagram of CuCrO(2) as a function of magnetic field and easy-axis anisotropy. Neglecting the weak interactions between hexagonal layers, CuCrO(2) is predicted to undergo transitions between three different 3-sublattice (SL) phases with increasing field: from a…
In the present work, focus is on the production of nano-sized talc particles in a stirred ball mill and their nano talc particles incorporated in the polyamide-6 polymer matrix to form polyamide/talc nanocomposite. The results show that enhancement in the polyamide/talc nanocomposite strength properties such as flexur…
We report on the fabrication of extreme ultraviolet (EUV) hybrid imagers with backside-illuminated detector chip based on aluminum gallium nitride (AlGaN) layers grown on silicon and integrated with CMOS readout chip. The focal plane array (FPA) size is 256 × 256 pixels with 10-μm pixel-to-pixel pitch. The devices wer…
We report on detailed measurements of the core structure of Shockley partial dislocations in colloidal crystals. In crystalline arrays of micrometer sized thermosensitive particles, the interactions between the colloidal building blocks were tuned by changing the temperature. Individual dislocation cores were observed…
While a number of studies have reported evidence of localized states in carbon nanotube devices, the density distribution of these states has not been reported until now. By measuring trap emission current in carbon nanotube field-effect transistors, we observe a prominent exponential tail in the density of states nea…
A fuel cell is an electrochemical device that converts the chemical energy of fuels directly to electricity. A popular way of evaluating a fuel cell is to measure its polarization curve, which is a plot showing the cell voltage change with current or current density. A good fuel cell should display a polarization curv…
In an effort to develop new electrical insulation materials, four different kinds of organically modified layered silicate were incorporated into an epoxy matrix to prepare nanocomposites for electrical insulation. Five wt% of organically modified layered silicates were processed in a planetary centrifugal mixer in an…