Materials Literature
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In this paper we present second harmonic generation (SHG) experiments designed to confirm the mechanism and quantify the transformation kinetics of the β–δ solid state phase transition in the organic nitramine molecule octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). The β phase adopts a centrosymmetric crystal…
We report on investigations of type I clathrate Si and Ge compounds with Ba partially substituted by rare earth atoms. Novel compounds from framework-deficient solid solutions Ba 8 Al x Si 42−3/4 x □ 4−1/4 x and Ba 8 Ga x Si 42−3/4 x □ 4−1/4 x ( x = 8, 12, 16; □, open square... lattice defect) have been prepared and c…
The coordinately unsaturated terbium complexes Tb.1 and Tb.2 possess two labile metal-bound water molecules that can be displaced upon metal chelation to aromatic carboxylic anions such as salicylic acid in water, which gives rise to large enhancements in the Tb(III) luminescence.
We have measured both the static and dynamic structure factors of a single dendrimer with small-angle x-ray scattering (SAXS) and neutron spin-echo spectroscopy under good solvent conditions with the aim of finding a consistent correlation between the structural properties of dendrimers and their dynamic behavior. The…
The structural changes of bovine serum albumin (BSA) and hen egg white lysozyme (HEL) upon their adsorption onto the surface or their embedding into the interior of poly(allylamine hydrochloride)-(poly(styrenesulfonate) (PAH-PSS) multilayer architectures were investigated by attenuated total reflection Fourier transfo…
An investigation of possibilities for superconductivity mediated by spin fluctuations in some elementary metals is motivated by the recent discovery of superconductivity in the hcp high-pressure phase of iron. The electronic structure, the electron-phonon coupling ($λ_{ph}$) and the coupling due to spin-fluctuations (…
Azobenzenes substituted with two urea groups, and especially the 2,2‘-disubstituted azobenzenes, form thermoreversible gels with a wide range of organic solvents at concentrations which are in some cases even as low as 0.2 mM. Most remarkably, the 2,2‘-disubstituted azobenzene gelator can form two different morphs, wh…
We study a scheme for electrical detection of the spin resonance (ESR) of a single electron trapped near a Field Effect Transistor (FET) conduction channel. In this scheme, the resonant Rabi oscillations of the trapped electron spin cause a modification of the average occupancy of a shallow trap, which can be detected…
CO adsorption on small cationic, neutral, and anionic Aun (n=1–6) clusters has been investigated using density functional theory in the generalized gradient approximation. Among various possible CO adsorption sites, the on-top (one-fold coordinated) is found to be the most favorable one, irrespective of the charge sta…
Structural genomics is emerging as a principal approach to define protein structure-function relationships. To apply this approach on a genomic scale, novel methods and technologies must be developed to determine large numbers of structures. We describe the design and implementation of a high-throughput structural gen…
Abstract The availability of efficient low‐cost ultraviolet (UV) film polarizers is of vital importance to a number of applications, which rely on the use of polarized light in the near‐UV regime. We describe here the preparation of such elements based on stretch‐oriented films comprising poly(vinyl alcohol) and a com…
The interaction of oxygen with titanium deposited on polycrystalline aluminum surfaces has been studied at room temperature and low oxygen pressures, using AES, XPS, and ARXPS. The growth of titanium on the aluminum surfaces occurs in two stages: formation of a uniform TiAl x layer up to ∼4 monolayers (ML), followed b…
Block copolymer nanofibers (BCNs) may be viewed as the macroscopic counterparts of polymer chains. While many techniques exit for the fractionation and characterization of polymer chains, these techniques generally fail when applied to BCNs. Reported in this paper is our preliminary success in fractionating polystyren…
A combination of rather unconventional XRPD methods has been used to assess the polymeric nature of the [Ru(L)(CO) 2 ] n (L = 2,2‘-bipyridine, 4,4‘-dimethyl-2,2‘-bipyridine, and 1,10-phenanthroline) derivatives. The polymeric chains pack pseudohexagonally in the ab plane and grow along c with Ru−Ru distances close to…
Urea-functionalized porphyrins with amino acid substituents bind sugar derivatives strongly in non-polar solution.
We report a numerical study of the tunnel conductance through the Schottky barrier at the contact between a semiconducting carbon nanotube and a metal electrode. In a planar gate model the asymmetry between the p-doped and the n-doped region is shown to depend mainly on the difference between the electrode Fermi level…
Abstract A procedure was developed for benzoylating the polystyrene segments in polystyrene‐ b ‐poly(ethylene‐ co ‐butene)‐ b ‐polystyrene (SEBS) triblock copolymers. The products were characterized by NMR spectroscopy, gel permeation chromatography, dynamic mechanical thermal analysis, and membrane osmometry. The mec…
Abstract Blends of poly(hydroxy ester ether) (PHEE), a recently developed bisphenol A ether‐based synthetic biodegradable thermoplastic polymer, with a soybean protein isolate and two hydrolyzed wheat glutens were studied. Blends of the proteins with PHEE were produced from 20 to 70% by weight of protein content. Youn…
Short-chain poly-(R)-3-hydroxybutyrate (cPHB), a highly flexible, amphiphilic molecule with salt-solvating properties, is a ubiquitous constituent of prokaryotic and eukaryotic cells, wherein it is mainly conjugated to proteins. The solvating properties and cellular distribution of cPHB suggest it may be associated wi…
Organogelators are small organic molecules that self-assemble at low temperature in long entangled and connected fibers to give birth to a random gel. In this paper, we describe a systematic procedure to prepare easily orientated samples by using a weak flow. We demonstrate that applying a mechanical shear stress duri…