Materials Literature
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Abstract The chain‐extension behavior of 2,2′‐bis(2‐oxazoline) (BOZ) was studied to evaluate the coupling effect on polyamide‐6 (PA6) in a Haake Rheocord mixer and an extruder. The relative torque of PA6 dramatically increased within 1–2 min, and the results were similar whether the added amount of BOZ in PA6 was the…
A periodic density functional modeling study of the partial oxidation of methanol to formaldehyde on an Ag(111) surface is presented. Methoxide binds strongly to the surface, preferentially to the highest coordination adsorption sites, while methanol and formaldehyde are weakly adsorbed far from the surface, with no p…
We report the results of a neutron powder diffraction study of the yttrium tantalates Y 0.785 Ta 0.215 O 1.715 and Y 0.7 Ta 0.3 O 1.8 . In the orthorhombic fluorite-related Y 0.7 Ta 0.3 O 1.8 compound, the Y and Ta atoms were occupationally ordered, and the oxygen ions were localized at around the stable positions. On…
The translational diffusion coefficient D(trans) for rubrene, 9,10-bis(phenylethynyl)anthracene (BPEA), and tetracene in the fragile molecular glass-former sucrose benzoate (SB) (Tg=337 K) was studied as a function of temperature from Tg+3 K to Tg+71 K by use of the holographic fluorescence recovery after photobleachi…
The effect of encapsulation of C 60 fullerenes upon the buckling strength of hosting carbon nanotubes (CNTs) has been investigated, using molecular dynamics (MD) simulations. The simulation results show that encapsulating C 60 fullerenes into some CNTs with diameters larger than that of the (10, 10) CNT, in particular…
The electrodynamics near the metal-to-insulator transitions induced, in ${\mathrm{V}}_{3}{\mathrm{O}}_{5}$ single crystals, by both temperature $(T)$ and pressure $(P)$ has been studied by infrared spectroscopy. The $T$ and $P$ dependence of the optical conductivity may be explained within a polaronic scenario. The in…
In this paper we have studied the effect of increasing carbon multi-walled nanotube (CNT) concentration in composites of syndiotactic polypropylene (sPP) having the same crystalline form but different morphologies. The attention was focused on the form I of sPP with different degrees of perfection (in terms of percent…
We report on a hybrid chemical sensor that can perform either amperometric or conductometric detection alone or simultaneously. It consists of an array of electrode pairs in which the two electrodes in each pair are separated with micrometer to nanometer-scale gaps. The gaps are bridged with conducting polymer (polyan…
The structures of the catalytically active sites in supported metal catalysts are a long sought after goal. In this study, XAS has been used to establish these structures. The ethene-induced changes in the XAS spectra as a function of temperature and pressure were correlated to changes in the adsorption mode of the hy…
Macrocyclic systems derived from crown-annelated terthiophene involving a median EDOT unit have been synthesized by coupling diiodooligooxyethylene chains and bis(2-cyanoethylsulfanyl)terthiophene under high dilution conditions. The metal cation complexing properties of the compounds have been analyzed using 1H NMR, U…
A series of rodlike ruthenium(II)-rhodium(III) polypyridine dyads based on modular oligo-p-phenylene bridges, of the general formula [(Me2phen)2Ru-bpy-(ph)n-bpy-Rh(Me2bpy)]5+ (Me2phen=4,7-dimethyl-1,10-phenanthroline; bpy=2,2'-bipyridine; ph=1,4-phenylene; n=1-3), have been synthesized and their photophysical properti…
We present a mathematically simple procedure to explain spontaneous symmetry breaking in quantum systems. The procedure is applicable to a wide range of models and can be easily used to explain the existence of a symmetry broken state in crystals, antiferromagnets, and even superconductors. It has the advantage that i…
Abstract The effect on mechanical and barrier properties upon addition of glycerol to temperature‐responsive hydrophobically modified (HM) potato starch was studied on free films. The addition of glycerol lowered the glass transition temperature, the storage modulus, and the water vapor permeability (WVP) for the HM s…
PURPOSE: To prospectively determine, by using dynamic imaging, whether a magnet placed over a specific area of the mouse brain could target systemically administered rhodamine-labeled magnetic fluid-loaded liposomes (MFLs) to that brain region. MATERIALS AND METHODS: Experiments were performed with a French Ministry o…
A method has been developed for creating bulk quantities of water-soluble single-walled carbon nanotubes (SWNTs) that contain multifunctional, acid-sensitive addends. Utilizing aryl diazonium salts, the repetitive functionalization protocol can yield multifunctional SWNTs containing moieties that would not be stable t…
In situ scanning tunneling microscopy has been used to examine the structure of the aniline adlayer and the conformation of polyaniline molecules produced electrochemically on a Au(111) electrode in 0.1 M sulfuric acid containing 30 mM aniline. As evidenced by the high-resolution STM imaging, a simple method of potent…
Abstract We show in this paper how zinc oxide (ZnO)/silver (Ag) composite microspheres can be prepared by the reduction of Ag(NH 3 ) 2 + with the reducing agent formaldehyde in aqueous solution on the surface of ZnO microspheres. During the preparation, Sn 2+ was absorbed on the surface of ZnO microspheres for sensiti…
Abstract A survey is presented on the crystallization kinetics and the morphology of miscible crystalline/crystalline polymer blends. There are only few corresponding systems. In them, however, a number of strange kinetic and structural phenomena can be observed: (i) spherulitic crystallization of the components side‐…
Carbon-coated Cu [Cu(C)] nanocapsules were prepared by a DC arc discharge method in a methane (CH 4 ) atmosphere, and characterized by x-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning differential thermal analysis (SDTA), transmission electron microscopy (TEM) and Raman spectroscopy. The results s…
Magnetic properties and bonding analyses of perovskite structure ${\mathrm{Co}}_{4}\mathrm{N}$ nitride have been investigated within density functional theory using both pseudopotential and all electron methods. In the same time, the structural and magnetic stabilities of pure cobalt in hexagonal close packed (hcp), f…