Materials Literature
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Four new charge-transfer (CT) salts based on the cationic ferrocenylmethylpyridinium (fmp) donor (CpFeCp-CH 2 -Py + ) and polyoxometalate (POM) acceptors, Lindqvist-type [M 6 O 19 ] 2− (M = Mo or W), the decatungstate isopolyanion [W 10 O 32 ] 4− and Keggin-type [PMo 12 O 40 ] 3−, namely, [CpFeCp-CH 2 -Py] 2 [Mo 6 O 1…
Optical techniques for probing surface and interface structure are introduced and recent developments in the field are discussed. These techniques offer significant advantages over conventional surface probes: all pressure ranges of gas-condensed matter interfaces are accessible and liquid-liquid, liquid-solid and sol…
The compound La(2)U(2)Se(9) was obtained in high yield from the stoichiometric reaction of the elements in an Sb(2)Se(3) flux at 1123 K. The compound, which crystallizes in a new structure type in space group Pmma of the orthorhombic system, has a three-dimensional structure with alternating U/Se and La/Se layers atta…
A nanostructured electromagnetic polyaniline-polyhydroxy iron-clay composite (PPIC) was prepared by oxidative radical emulsion polymerization of aniline in the presence of polyhydroxy iron cation (PIC) intercalated clays. Morphological observation through SEM, TEM, and AFM suggested the formation of self-assembled nan…
We report here a new electrochemical method for in situ deposition of Pt nanoparticles onto multiwalled carbon nanotubes (MWNTs) to form a three-dimensional uniform Pt/MWNT nanocomposite with excellent electrocatalytic activity toward the oxidation of methanol, by taking advantage of the good solubility of MWNTs and c…
Mixtures of InN and SnO 2 powders, with a weight ratio of 10:1, have been used as precursors for the thermal growth of arrow-shaped and other elongated micro- and nanostructures of indium−tin oxide (ITO) containing about 2.6 atom % of Sn. The temperatures used in the process, in the range 650−750 °C, favor the decompo…
Laser induced changes in the properties of Sb 2 S 3 thin films prepared by chemical bath deposition are described in this paper. Sb 2 S 3 thin films of thickness 550 nm were deposited from a solution containing SbCl 3 and Na 2 S 2 O 3 at 27 °C for 5 h. These thin films were irradiated by a 532 nm continuous wave laser…
The surfaces of quasicrystals have been extensively studied since about 1990. In this paper we review work on the structure and morphology of clean surfaces, and their electronic and phonon structure. We also describe progress in adsorption and epitaxy studies. The paper is illustrated throughout with examples from th…
A novel type of hollow polymeric particles was prepared according to a strategy consisting of three major steps: the synthesis of template particles (PMV) based on maleic anhydride/vinyl acetate; the formation of core/shell particles by using maleic anhydride/divinylbenzene as comonomers, AIBN as initiator, and PMV as…
We present particulate simulation results for translational and rotational friction components of a shish-kebab model of a colloidal rod with aspect ratio (length over diameter) L/D=10 in the presence of a planar hard wall. Hydrodynamic interactions between rod and wall cause an overall enhancement of the friction ten…
Schnell oder langsam: Die Rotorgeschwindigkeit in den Hybridwänden von porösem p-Phenylensilica lässt sich über die Aufnahme und Abgabe von Gästen steuern. Je nach Art des Gastes und der Temperatur kann der molekulare Rotor den Bereich von langsam bis sehr schnell (k=104–108 s−1) überstreichen, wie durch Festkörper-Sp…
A new precursor, SU-8, which is a negative photoresist, was electrospun to produce ultrafine polymeric fibers with a wide range of morphology and wettability characteristics. Electrospun nanofibers of SU-8 were pyrolyzed at 1173 K in an inert atmosphere to give carbon nanofibers. A set of parameters, including electri…
Poliestireno (PS) é um dos materiais descartáveis mais usados no nosso cotidiano, mas ele não se decompõe facilmente. A adição de amido de mandioca ao PS pode melhorar a sua degradabilidade, tendo em vista ser o amido um polímero biodegradável. O objetivo deste trabalho foi desenvolver blendas de PS e (amido termoplás…
We study the time-dependent transport of heat in a nanoscale thermal switch. The switch consists of left and right leads that are initially uncoupled. During switch on the coupling between the leads is abruptly turned on. We use the nonequilibrium Green's function formalism and numerically solve the constructed Dyson…
We report the preparation of the first benzannulated phenalenyl neutral radical conductor (18), and we show that the compound displays unprecedented solid state behavior: the structure is dominated by two sets of intermolecular interactions: (1) a pi-chain structure with superimposed pi-overlap of the benzannulated ph…
Nano-Nuss: AgCCtBu reagiert mit AgOTf in Gegenwart eines Polyoxometallats (POM) als Templat unter Solvothermalbedingungen zu einem Kern-Schale-Nanocluster, dessen erdnussartige Struktur (siehe Bild) aus zwei Mo6O228−-„Nüssen“ (grün) und einer Ag60-Schale (lila) besteht. Nach elektrochemischen Untersuchungen wirkt die…
A spin-polarized density functional theory calculation was carried out to study the adsorption of NH(x) species (x = 1-3) on a TiO2 anatase (101) surface with and without hydroxyl groups by using first-principles calculations. It was found that the present hydroxyl group has the effect of significantly enhancing the a…
We demonstrate the electrochemical capture of CdSe semiconductor nanocrystals (NCs), with thiophene-terminated carboxylic acid capping ligands, at the surfaces of electrodeposited poly(thiophene) films (i) poly((diethyl)propylenedixoythiophene), P(Et)(2)ProDOT; (ii) poly(propylenedioxythiophene), PProDOT; and (iii) po…
We present real-time observations of a new growth pattern called a spiral two-phase dendrite, which we observed during univariant directional solidification of a ternary-eutectic alloy. Two different crystal phases grow from the apex of a parabolic finger, forming a spiral pattern that leaves behind in the solid a dou…
The subfamily Asclepiadoideae (Apocynaceae) and the closely-related Periplocoideae are sources of many indigenous Indian medicinal plants. We surveyed antioxidant properties and total phenolic and flavonoid contents of 15 samples, representing 12 Indian medicinal plant species from these subfamilies. Total antioxidant…