Materials Literature
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The temperature and the Gibbs free energy of activation of the α-relaxation in ethylene-1-octene and ethylene-1-hexene copolymers drop with decreasing crystal size which is triggered by increasing concentration of short-chain branches and/or increasing cooling rate during melt crystallization, respectively. The activa…
Isolated slightly hydrophilic chains of poly(isocyanodipeptides) (PICs) adsorbed on mica were studied by intermittent contact mode−scanning force microscopy (IC−SFM) in an ambient atmosphere controlled both with respect to the relative humidity (RH) and the presence of CHCl 3 vapor. SFM revealed that the average chain…
A broad range of measurements of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Cr}{\mathrm{O}}_{3}\phantom{\rule{0.2em}{0ex}}(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.5)$ are presented. $\mathrm{La}\mathrm{Cr}{\mathrm{O}}_{3}$ is an insulating antiferromagnet with N\'eel temperature ${T}_{N}=293\pha…
Poly(hydroxybutyrate-co-hydroxyhexanoate) (PHBHHx), a member of the polyhydroxyalkanoate family of biopolyesters, has superior mechanical properties and biocompatibilities that enable it to meet diverse biomedical requirements. The main component of PHBHHx is DL-beta-hydroxybutyric acid (HB), a ketone body that is als…
We have investigated the effect of sulfide treatment on the electrical characteristics of Pt contacts on (000-1) n-type ZnO(∼5×1015cm−3) single crystals. The Pt contact on conventionally cleaned ZnO surface shows an ohmic behavior. However, the contact produces a Schottky behavior, when the ZnO surface is etched in a…
We report herein the template-directed synthesis, characterization, and electric properties of single-walled carbon nanotube- (SWNT-) based coaxial nanowires, that is, core (SWNT)-shell (conducting polypyrrole and polyaniline) nanowires. The SWNTs were first dispersed in aqueous solutions containing cationic surfactan…
Stream cleaning: CO in CO/H2 mixtures is oxidized preferentially at room temperature with an aqueous polyoxometalate (POM) solution over gold catalysts (see scheme). The rate of H2 oxidation is slow and is inhibited by CO. This process can be used to remove CO efficiently from H2 gas streams. The solution containing p…
ADVERTISEMENT RETURN TO ISSUEPREVNoteBiomimetic Nanostructured Materials: Inherent Reversible Stabilization of Polypeptide MicrocapsulesDonald T. Haynie, Naveen Palath, Yang Liu, Bingyun Li, and Nikhil PargaonkarView Author Information Biomedical Engineering, Physics, Chemical Engineering, and Center for Applied Physi…
Magnetic field induced steplike changes in magnetization and resistivity of ${\mathrm{Sm}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ manganites were studied. A strong dependence of these features on the cooling rate was observed. Magnetostriction, however, does not show the presence of large stra…
Collision-induced dissociation (CID) of silver–amino acid clusters results in the formation of the silver hydride cluster [Ag4H]+, which mediates CC bond coupling of allyl bromide (see scheme). Energy-resolved CID experiments reveal that the product is 1,5-hexadiene and suggest analogies between the chemistry of the…
The magnetic and photomagnetic properties of two cyano-bridged, [Mn(bpy) 2 ] 4 [Mo(CN) 8 ] 2 ·14H 2 O ( 1 ) and [Mn(bpy) 2 ] 4 [W(CN) 8 ] 2 ·9H 2 O ( 2 ) (bpy = 2,2‘-bipyridyl), hexanuclear clusters (hereafter named Mn II 4 M IV 2 ) have been investigated. Before irradiation both compounds behave as paramagnets in alm…
Model liquids have been constructed to study the role of local structure in the anomalous properties of liquid water. The intermolecular potentials were modified by increasing the weight of the Lennard-Jones term relative to the electrostatic term in the SPC/E model for water. The resulting family of liquids varies fr…
The geometrically frustrated spin-chain compound ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{2}{\mathrm{O}}_{6}$ was recently found to exhibit properties suggesting the phenomenon of quantum tunneling of the magnetization (QTM). The present paper addresses this issue by investigating the temperature and magnetic-field dependence…
We have theoretically studied nitrogen doping of carbon nanotubes in a periodic supercell using density functional theory. We find that the most stable isomer is different for different chiralities of the tube. In the (10,0) tube, N atoms tend to be uniformly distributed, while they prefer to be adjacent to each other…
Abstract The concept of “overheating” is one of the known methods for manufacturing single polymer composites. This concept is validated on two categories of semi‐crystalline polymers: the drawable, apolar (i.e., isotactic polypropylene [iPP], ultra‐high molecular weight polyethylene [UHMWPE]) and the less drawable, p…
A series of alpha,omega-donor-substituted distyrylbenzene dimers held together by the [2.2]paracyclophane core were designed, synthesized, and characterized. Different substituents were chosen to modulate the strength of the donor nitrogen groups and to allow the molecules to be either neutral and soluble in nonpolar…
We have carried out a series of ab initio calculations to investigate changes in the optical properties of Si quantum dots as a function of surface passivation. In particular, we have compared hydrogen-passivated dots with those having alkyl groups at the surface. We find that, while on clusters with reconstructed sur…
Thin films of the intercalated organic−inorganic hybrids (PPy) x MoO 3 (PPy: polypyrrole) have been prepared by an ex-situ intercalation process. The host MoO 3 films were first deposited on LaAlO 3 (LAO) single-crystal substrates by using a CVD method followed by the intercalation of PPy into the MoO 3 films. The pre…
A pH-responsive volume-change function was successfully introduced into a supramolecular hydrogel that contained GalNAc-appended (GalNAc=N-acetylgalactosamine) glutamate ester 1 by the simple mixing of it with an appropriate amount of 2 a or 2 b amphiphilic carboxylic acid. In the 1:1 mixture (1:2), the hydrogel swell…
Configurational states that are to be associated, according to Goldstein, with the basins in the potential energy landscape cannot be characterized by any particular basin identifier such as the basin minima, the lowest barrier, the most probable energy barrier, etc. since the basin free energy turns out to be indepen…