Materials Literature
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The luminescent enhancement effect of Y(TTA) 3 Phen (TTA = thenoyltrifluoroacetone; Phen = 1,10-phenanthroline) on Eu(III) in Langmuir−Blodgett (LB) films of rare earth complexes mixing with arachidic acid (AA) in a molar ratio of 1:1 and the intermolecular energy transfer from Y(TTA) 3 Phen to Eu(TTA) 3 Phen in the f…
Transmission electron microscopy has been used in conjunction with RuO 4 staining to investigate the structure of (iPP/iPP- g -MA)−PA6 reaction bonded interfaces and microdeformation at interfaces which had failed by crack propagation along the interface. In relatively weak interfaces, the crack tip was preceded by a…
The molecular dynamics of an 1100 low molecular weight polystyrene are reexamined by photon correlation spectroscopy measurements. The new experimental data combined with recoverable creep compliance data taken previously on the same sample provides information on the local segmental motion in a wide time window of mo…
In this paper, we report on how interaction strength varies with pressure and temperature for several polyolefin mixtures. We find that the interaction energies that govern phase behavior in polymer blends are only a function of density for UCST polyolefin blends far from a critical point. As a result, the effects of…
New π-conjugated polymers constituted of a benzimidazole unit have been prepared. Palladium-catalyzed polycondensation between 4,7-dibromobenzimidazole bearing a hindered phenolic substituent (3,5-di- tert -butyl-4-hydroxyphenyl) and four kinds of diethynylaromatic compounds HC⋮C Ar C⋮CH (e.g., Ar = p -phenylene ( p -…
The Bechgaard salts, an unusual class of organic conductors, have yielded a rich variety of electronic phenomena. In particular, they exhibit low dimensionality, allowing the study of the peculiar behavior of electrons in nearly one-dimensional systems. In their Perspective, Bourbonnais and JA©rome discuss results rep…
Micromachined silicon gratings offer two great advantages to astronomical spectroscopy in the IR: (1) Photolithographic processing techniques permit the production of gratings with much larger groove constants than are possible with conventional wavelength coverage, despite the relatively small format of IR arrays. (2…
The influence of impurities on the morphology of ε-caprolactam crystals was examined in terms of molecular recognition processes at the crystal/solution interface. Summing the intermolecular interactions, using the atom−atom approximation together with the DREIDING force field provided a convergence in the lattice ene…
The space charge characteristics in cross-linking polyethylene ( LPE) are investigated under various electrical stresses from dc to power frequency. The pulsed electro-acoustic method is improved to meet the needs of measurement under ac voltages. The frequency and phase angle dependences of the space charge are studi…
A series of thin films of blends of poly(styrene- d 8 ) and poly(styrene- co - p -bromo x -styrene), where 1 ≥ x ≥ 0, cast on to silicon wafers are examined by atomic force microscopy, X-ray photoelectron spectroscopy, and static secondary ion mass spectrometry. Films deposited on wafers stripped of the native oxide a…
Intensity of the surface-enhanced Raman scattering (SERS) of 1-propanethiol adsorbed on a silver film prepared chemically has been measured over the 15−300 K surface temperature range. A reversible change in the SERS intensity with the temperature has been observed, with the intensity at 15 K being larger than that at…
Reactions of semicrystalline poly(ethylene terephthalate) (PET) film with 3-aminopropyltrialkoxysilanes at the film−solution interface and subsequent hydrolysis render silanol (Si−OH) functionality that is attached to the PET surface by amide linkages (PET−CONH(CH 2 ) 3 Si(OH) 3 ). Toluene was found to be the preferre…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTArtificial Spinning of Spider SilkAndreas Seidel, Oskar Liivak, and Lynn W. JelinskiView Author Information Center for Advanced Technology in Biotechnology, 130 Biotechnology Building, Cornell University, Ithaca, New York 14853 Cite…
Optical experiments were conducted on a series of organic linear chain conductors with different values of the interchain single-electron transfer integral tb, which quantifies the degree of anisotropy. Electron-electron interactions together with Umklapp scattering resulted in a correlation gap and an insulating stat…
Temperature lags between the heating element and the sample are known to exists during a thermoluminescence measurement. The experimental difficulties associated with the temperature lag can be quite serious, when one wants to extract physical information from the glow curves, because it is obviously essential to know…
By means of magneto-optical Kerr effect we observe spin reorientations from in-plane to out-of-plane and vice versa upon annealing thin Fe films on Ag(001) at increasing temperatures. Scanning tunneling microscopy images of the different Fe films are used to quantify the surface roughness. The observed spin reorientat…
The effect of quenched random ferromagnetic bonds on the antiferromagnetic correlation length of a two--dimensional Heisneberg model is studied, applying the renormalization group method to the classical non--linear sigma model with quenched random dipole moments. It is found that the antiferromagnetic long range orde…
A method for calculating the short-range order part of the free energy of order-disorder systems is proposed. The method is based on the apllication of the cumulant expansion to the exact configurational entropy. Second-order correlation corrections to the mean-field approximation for the free energy are calculated fo…
The Kronig-Penney model is used to Study the effect of nonlinear interaction on the transmissive properties of both ordered and disordered chains. In the ordered case, the nonlinearity can either localize or delocalize the electronic states depending on both its sign and strength but there is a critical strength above…
Heme, the iron-containing cofactor essential for the activity of many enzymes, is incorporated into its target proteins by unknown mechanisms. Here, an Escherichia coli hemoprotein, CcmE, was shown to bind heme in the bacterial periplasm by way of a single covalent bond to a histidine. The heme was then released and d…