Materials Literature
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Single-crystal beta-MnO(2) nanotubes with diameters in the range 200-500 nm and lengths up to several micrometers were successfully prepared by a simple hydrothermal method through oxidizing MnSO(4) with NaClO(3) in the presence of poly(vinyl pyrrolidone) (PVP). It was found that the formation process of beta-MnO(2) n…
Two new anil molecules exhibiting photochromism in the crystalline state, N -(4-hydroxy)-salicylidene-amino-4-(methylbenzoate) ( 2 ) and N -(3,5-di- tert -butylsalicylidene)-4-aminopyridine ( 3 ), are obtained. Upon irradiation in the UV, the yellow crystals change color to red, owing to enol-keto intramolecular tauto…
A rationally designed peptide and a thioalkylated poly(ethylene glycol) are used to stabilize Ag nanoparticles in water. Particle aggregation and oxidation are prevented to such a degree that nanoparticle solutions are stable in the presence of high concentrations of NaCl and over a wide pH range. This opens the door…
Abstract Implosion of vaporous cavities is exothermal, thereby heating the cavitating liquid. In vibratory cavitation erosion (VCE) tests the erosion rate increases with test liquid temperature. In order to obtain the erosive properties of a given material at a given temperature, it is necessary to control the test li…
Abstract This work deals with the role of liquid water on the microstructure of a semiaromatic polyamide (MXD6). One side of injected plates is kept in contact with water during different durations. After immersion, microtomic cuts are performed at different depth and are analyzed by X‐ray diffraction, differential sc…
Abstract The emulsion polymerization of some monomers can occur without the conventional free radical initiators under ultrasonic irradiation. However, the initiation mechanism is still under controversy. In this paper, the sources of free radicals arising from ultrasonically initiated emulsion polymerization were inv…
The electronic and geometrical local structures of Re-based double perovskites, A 2 FeReO 6 (A = Ba, Sr, Ca), have been probed by using x-ray absorption spectroscopy at the Fe K- and Re L 1,2,3 -edges. The measurements have shown a significant sensitivity of the Fe K- and Re L 1 -edges to the Fe and Re valences, respe…
The double layer capacitance properties of activated carbon fibers (ACFs) in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) were discussed in comparison with propylene carbonate solution of 0.5 M (C2H5)4NBF4 (TEABF4/PC) as typical organic electrolyte for electric double layer capacitor (EDLC). In the case of…
Magnetization and neutron powder diffractionmeasurements have been carried\nout on CoVSb. Both the transport and magnetic properties are predicted by\nband theory to depend upon the nature of the atomic order in the C1b lattice.\nCalculations in which the cobalt atoms occupy the (4b) site predict half-metallic\nbehavi…
A non-Markovian partial differential equation, rooted in the theory of Brownian motion, is proposed for describing heat conduction by phonons. Although a finite speed of propagation is a built-in feature of the equation, it does not give rise to an inauthentic wave front that results from the application of Cattaneo's…
The performance of electric double layer capacitor (EDLC) with an ionic liquid, 1-ethy-3-methylimidazolium tetrafluoroborate (EMIBF4) electrolyte containing LiBF4, has been investigated and compared with that of EDLC containing EMIBF4 without LiBF4 as well as containing a conventional organic electrolyte, triethylmeth…
Mined over matter: The partial oxidation of sub-bituminous coal by FeIII ions in 5 M H2SO4 at 100 °C was used in the anodic compartment in a prototype coal fuel cell, with a solution of VO2+/VO2+ in 5 M H2SO4 in the cathodic compartment (see scheme). The cell operated without loss of performance for 1000 h at 100 °C,…
A composite film of optically active poly(3,4-ethylenedioxythiophene) was prepared by electrochemical polymerization in double-stranded DNA as a chiral nematic liquid-crystal field. The polymer film showed a Cotton effect in a circular dichroism spectrum, and it also showed honeycomb morphologies in a scanning electro…
Synthetic exploration of K/Cu/Th/S quaternary phase space has yielded three new compounds: KCuThS3 (I), K2Cu2ThS4 (II), and K3Cu3Th2S7 (III). All three phases are semiconductors with optical band gaps of 2.95, 2.17, and 2.49 eV(I-III). Compound I crystallizes in the orthorhombic space group Cmcm with a = 4.076(1) A, b…
Well-defined photoresponsive polymers of vinyl ethers with various azo side groups were synthesized via living cationic copolymerization using Et1.5AlCl1.5 in the presence of an ester as an added base. Despite the apparently undesirable structures, too basic or bulky, of azo-containing monomers for cationic polymeriza…
The vibrational properties of silicon carbide nanoparticles (np-SiC) were investigated as function of the nanocrystal size (5–25 nm) and the features of their outermost surfaces. Raman experiments and numerical methods were conjugated to characterize the signatures from the active SiC normal modes and the vibrational…
Ferroelectric relaxor 0.91PbMg 1/3 Nb 2/3 O 3 –0.09PbTiO 3 single crystals in a wide temperature range were studied using dielectric, x-ray powder diffraction and Raman scattering techniques. Dielectric studies show that without applying an external electric field, 0.91PMN–0.09PT exhibits typical relaxor behaviour wit…
A series of donor-pi-donor derivatives containing phenyl, naphthyl, and anthryl groups as the pi-center and heterocyclic rings as the conjugation bridge have been synthesized and their one- and two-photon spectroscopic properties and photostability were determined. These compounds show bathochromic shifts in the absor…
The time-dependent chemisorption of 2-chlorophenol on a fumed silica surface was studied in situ from 200 to 500 degrees C using a temperature-controlled dosing cell and FTIR absorption spectroscopy. 2-Chlorophenol was found to chemisorb at isolated and geminal surface hydroxyl sites. 2-Chlorophenol chemisorption and…
Abstract Inorganic–organic hybrids mediated by hydrogen‐bonding interactions involving silicon oxide network and poly(ε‐caprolactone) (PCL) were prepared via an in situ sol–gel process of tetraethoxysilane in the presence of PCL. Fourier transform infrared spectroscopy indicated that there were hydrogen‐bonding intera…