Materials Literature
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We have investigated the electronic and magnetic properties of a MnAs:GaAs granular film with MnAs clusters embedded in the GaAs matrix fabricated by high-temperature annealing of Ga1−xMnxAs using x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). The XAS line shapes in the Mn 2p core le…
Ferroelectric domain structures of a 〈001〉-oriented lead magnesium niobate–lead titanate tetragonal crystal were examined under cyclic bipolar electric fields. Complex patterns of orthogonal domain strips were found to emerge from a simple structure of parallel strips of 90° domains. Near the boundary between the two…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSequence-Length Segregation during Crystallization and Melting of a Model Homogeneous CopolymerWenbing Hu and Vincent B. F. MathotView Author Information FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands, and DSM Research, P.O. Bo…
Abstract Electrically conductive organic and metalloorganic polymers are of great interest and they have applications in electronic, optical, photonic, photoelectric, electrochemical, and dielectric devices. Tetrameric cobalt phthalocyanine was prepared by conventional chemical method. The dielectric permittivity of t…
Abstract Summary : A common bottleneck in combinatorial materials science occurs at the characterization stage. Here we discuss an instrument for the rapid measurement of mechanical properties of polymer libraries, which allows for 96 simultaneous measurements to be taken under a variety of conditions. For example, pl…
The structural features of Mn(II) incorporated into two large cage zeotypes, Mn-UCSB-10Mg and Mn-UCSB-6Mg, were explored by combining multifrequency CW-EPR with W-band ENDOR spectroscopy. As-synthesized samples, dried both at room temperature and 150 °C, were examined and the results were compared with the reference s…
Cd(HCOO)2·2H2O single crystals weakly doped with Cu(II) ions have been studied by cw-EPR (4.2–300 K) and by electron spin echo – ESE (4.2–60 K). Copper(II) ions substitute Cd(II) in two different sites forming Cu(HCOO)6–Cuf and Cu(HCOO)2(H2O)4–Cuw octahedral complexes with strong preference to Cuf as shown by the inte…
The simultaneous synthesis of gold nanoparticles in both water and chloroform by the spontaneous reduction of aqueous chloroaurate ions by a diamine-containing oxyethylene linkage that partitions in both phases is demonstrated. The oxidation of the diamine consequent to reduction of the gold ions results in the polyme…
The calculated intermolecular and intramolecular indirect NMR spin-spin coupling constants and NMR shifts were used for the discrimination between the inner-shell and the outer-shell binding motif of hydrated divalent cations Mg(2+) or Zn(2+) with a guanine base. The intermolecular coupling constants (1)J(X,O6) and (1…
We deposited an RuO2/Pb(Zr0.40Ti0.60)O3/RuO2 capacitor by metalorganic chemical vapor deposition. RuO2 and Pb(Zr0.40Ti0.60)O3 films were prepared at 350, 395, and 445 °C from respective Ru(C7H11)(C7H9)–O2 and Pb(C11H19O2)2–Zr(O⋅t-C4H9)4–Ti(O⋅i-C3H7)4–O2 systems. Good ferroelectricity was observed for PZT films deposit…
Reactions of the molybdates Na(2)MoO4.2 H2O and (nBu(4)N)2[Mo2O7] with [[Ru(arene)Cl(2)](2)] (arene=C(6)H5CH3, 1,3,5-C6H3(CH3)(3), 1,2,4,5-C6H2(CH3)4) in water or organic solvents led to formation of the triple-cubane organometallic oxides [[Ru(eta(6)-arene)](4)Mo4O16], whose crystal and molecular structures were dete…
One of key aims of modern chemistry is to explore and exploit the phenomenal complexity of matter that seems to arise spontaneously within ambient environments like that of our planet. Biology, of course, is a ultimate manifestation of a universal chemical canon encompassing interactions both at the molecular and supr…
The triple-helical fold of collagen requires the presence of a glycine residue at every third position in the peptide sequence and is stabilized by proline and (4R)-4-hydroxyproline residues in positions Xaa and Yaa of the (Xaa-Yaa-Gly) triplets, respectively. Regular down/up puckering of these Xaa/Yaa residues is pos…
Evidence is presented that the well-established phenomenon of promotion of Ce0.5Zr0.5O2 reduction by suitable treatment procedures may be controlled by adjusting the conditions; and that such reduction leads to the formation of the pyrochlore structure at extremely low temperature.
UV-vis absorption, luminescence and field emission properties have been studied in pristine multiwalled carbon nanotubes (MWNTs) and MWNTs with different functionalized groups, i.e., MWNT attached with the carboxylic and hydroxyl group ( s -MWNT), MWNT attached with dodecylamine (MWNT-CONHC 12 H 25 ) and MWNT attached…
A new synthesis of benzo[1,2]oxasiloles is described, wherein an unprecedented intramolecular allylic transposition takes place probably involving a pentavalent silicon intermediate.
Abstract Stereoregular poly(methyl methacrylate) (PMMA)–silica nanocomposites were prepared using stereocomplex formation between i ‐PMMA and s ‐PMMA by an in situ method. The methodology adopted here is the simultaneous formation of organic gel and inorganic gel, the so‐called interpenetrating polymer network (IPN) f…
The sandwiched structures with a layer of amorphous silicon (a-Si) between two a-SiNx layers have been fabricated by plasma enhanced chemical vapor deposition technique. Si nanocrystal (nc-Si) layer was formed by crystallization of the a-Si layer according to the constrained crystallization principle after thermal ann…
Abstract Minority structures are considered to be defect structures that are formed during polyethylene (PE) preparation and during the crosslinking process in PE. The minority structures that play the predominant role in PE crosslinking are vinyl double bonds. Moreover, the decomposition of dicumyl peroxide in PE doe…
In order to optimize the fullerene synthesis process based on an electric arc with graphite electrodes, an experimental study using a reactor geometry optimized for plasma spectroscopy is performed to correlate the arc properties with the fullerene formation. Emission spectroscopy studies based on the use of the Swan…