Materials Literature
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A vibrational study of the polymer electrolyte compound poly(ethylene oxide) 6:LiAsF 6 is reported. A symmetry-based factor group correlation method is applied to interpret the observed bands. The Raman and infrared spectra of the compound are consistent with the reported crystal structure. The ν 1 mode, which appears…
The magnetic molecule Fe${}_{8}$ has a rich pattern of degeneracies in its magnetic spectrum as the static magnetic field applied to it is varied. The points of degeneracy, or diabolical points in the magnetic field space, are found exactly in the simplest model Hamiltonian for this molecule. They are shown to form a…
The contact angle between a free standing film of a smectic-A liquid crystal and its meniscus is different from zero. It increases independently of the meniscus size when the film thickness decreases. This angle provides a very precise measurement of the film tension and of the interactions between the two free surfac…
A series of calcined borosilicate molecular sieves are treated hydrothermally with aqueous acetic acid and subsequently characterized in detail. The acid treatments are shown to expel boron from the molecular sieves, and the defects created by the boron removal are subsequently healed with silicon dissolved from other…
A cyclen (=1,4,7,10-tetraazacyclododecane) doubly functionalized with three carbamoylmethyl groups and one dansylaminoethyl (dansyl = 2-(5-(dimethylamino)-1-naphthalenesulfonyl) group (L(2) = 1-(2-(5-(dimethylamino)-1-naphthalenesulfonylamido)ethyl)-4,7,10-tris(carbamoylmethyl)-cyclen) was synthesized and characterize…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTControlled Placement of Luminescent Molecules and Polymers in Mesostructured Sol−Gel Thin FilmsRaquel Hernandez, Anne-Christine Franville, Payam Minoofar, Bruce Dunn, and Jeffrey I. ZinkView Author Information Department of Chemistry and Biochemistry University of Cali…
Electrochemical lithium doping into carbon electrodes consisting of multiwalled carbon nanotubes produced by catalytic decomposition of acetylene has been carried out in button cells. Direct observation of the sample by low- and high-resolution transmission electron microscopy reveals that the lithium species are not…
With a spatial correlation model, a simple method was established to evaluate the crystallinity and stress of cubic boron nitride (cBN) films from the variation of linewidth and peak shift of Raman spectra. An increase of crystallinity and a decrease of stress of the cBN films with growth time were demonstrated. As a…
Delivery of NO to specific targets is important in fundamental studies and therapeutic applications. Various methods have been reported for delivery of NO in vivo and in vitro; however, there are few examples of systems that reversibly bind NO. Reported herein is the development of a new polymer (P-1[Co(II)]) that rev…
Although shape-memory metal alloys have wide use in medicine and other areas, improved properties, particularly easy shaping, high shape stability, and adjustable transition temperature, are realizable only by polymer systems. In this paper, a polymer system of shape-memory polymer networks based on oligo(ɛ-caprolacto…
We measure the displacement response of a frictional multicontact interface between identical polymer glasses to a biased shear force oscillation. We evidence the existence, for maximum forces close below the nominal static threshold, of a jamming creep regime governed by an ageing-rejuvenation competition acting with…
Building upon traditional quantum chemistry calculations, we have implemented an {\em ab-initio} method to study the electrical transport in nanocontacts. We illustrate our technique calculating the conductance of C$_{60}$ molecules connected in various ways to Al electrodes characterized at the atomic level. Central…
Finite-size and surface effects in fine particle systems are investigated by Monte Carlo simulation of a model of a $γ$-Fe$_2$O$_3$ (maghemite) single particle. Periodic boundary conditions have been used to simulate the bulk properties and the results compared with those for a spherical shaped particle with free boun…
Although shape-memory metal alloys have wide use in medicine and other areas, improved properties, particularly easy shaping, high shape stability, and adjustable transition temperature, are realizable only by polymer systems. In this paper, a polymer system of shape-memory polymer networks based on oligo(epsilon-capr…
Nanoparticles of 1-phenyl-3-((dimethylamino)styryl)-5-((dimethylamino)phenyl)-2-pyrazoline (PDDP) ranging from tens to hundreds of nanometers were prepared by using the reprecipitation method. Their excitonic transitions responsible for absorption and emission, as compared with those of dilute solution, have been inve…
BACKGROUND: Based on the observation that ultrasmall superparamagnetic particles of iron oxides (USPIOs) are phagocytosed by cells of the mononuclear phagocytic system, the purpose of this study was to evaluate their use as a marker of atherosclerosis-associated inflammatory changes in the vessel wall before luminal n…
By introducing benzoyl–benzene into a cholesteric liquid crystal, the helix unwinding voltage was reduced. This reduction was roughly proportional to the concentration of the dopant and was present for driving frequencies across the audio spectrum. It is believed that this voltage reduction is primarily due to a pertu…
Amorphous TiO 2 thin films and ZnFe 2 O 4 -doped TiO 2 composite films were deposited by radio frequency magnetron sputtering. The effect of ZnFe 2 O 4 doping on the optical properties of TiO 2 thin films was reported. Our results show that the absorption edge of TiO 2 thin films and composite films exhibits a blueshi…
Ni/γ-Al2O3 catalysts show high catalytic activity for the selective catalytic reduction of NO by C3H6. The microstructures of nickel species were characterized by the spectroscopy of X-ray Absorption Near Edge Structures (XANES) and Extended X-ray Absorption Fine Structures (EXAFS). The results of XANES and EXAFS indi…
A Landau–Ginsburg–Devonshire-type thermodynamic theory is used to describe epitaxial ferroelectric films with dense laminar domain structures, where spontaneous polarizations in both domains are oriented in the film plane. For PbTiO3 films, it is found that, at positive misfit strains, the domain patterning transforms…