Materials Literature
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The Landauer-Buettiker formalism combined with the tight-binding transfer matrix method is used to describe the results of recent experiments: the high tunneling magnetoresistance (TMR) in (Ga,Mn)As-based trilayers and highly polarized spin injection in p-(Ga,Mn)As/n-GaAs Zener diode. For both TMR and Zener spin curre…
Current Induced Resistance Switching (CIS) was recently observed in thin tunnel junctions with ferromagnetic (FM) electrodes \emph{i.e} FM/I/FM. This effect was attributed to electromigration of metallic atoms in nanoconstrictions in the insulating barrier (I). Here we study how the CIS effect is influenced by a thin…
We present linear (AB)(n)() multiblock copolymers that exhibit a thermally induced reversible alteration of the surface composition at a sharply defined transition temperature T(s) of 120-170 degrees C depending on the polymer structure. At temperatures below T(s) the surface consists of block A, a 4,4'-methylenediphe…
Abstract Aluminum acetylacetonate, Al(acac)3, was prepared in the reaction between the mineral boehmite, [AlO(OH)]n, and acetylacetone (2,4-pentanedione; Hacac) in water. In this one-step synthesis, the pale yellow crystalline product precipitated out of the solution. Characterization of the recrystallized crystal by…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInterface Roughness Correlation in Diblock Copolymer Brushes Synthesized by Atom Transfer Radical PolymerizationBulent Akgun, William J. Brittain, Xuefa Li, Jin Wang, and Mark D. FosterView Author Information Maurice Morton Institut…
Using density functional theory, we have theoretically studied the origin of ferromagnetic coupling of spins in the long multiple deckers of vanadium sandwich complexes with benzene (Bz). This is done by calculating the band structure of their infinite one-dimensional (1D) crystals along the periodic (=Z) direction. W…
The synthesis of polycrystalline PbMoO 4 material suitable for use as the starting charge for crystal growth was investigated employing a solid-state sintering method. The solidification behavior of the material was studied by the differential thermal analysis (DTA) technique, with an aim to model the growth by the Cz…
[structure: see text] A new photochromic thieno-2H-chromene alpha-amino acid derivative was prepared by C-N palladium-catalyzed cross-coupling of a bromothieno-2H-chromene with the aminated aromatic side chain of the methyl ester of a N,N-diprotected amino acid. Its good photochromic properties demonstrated by flash p…
Carboxy-methyl beta-cyclodextrin (CMCD) cavities have been intercalated within the galleries of anionic clay, Mg-Al layered double hydroxide (LDH). The cyclodextrin functionalized LDH has been reported to adsorb neutral and nonpolar guest molecules. X-ray diffraction, IR, and Raman vibrational spectroscopy and (13)C C…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTPhase Transformation in Self-Assembly of the Gold/Poly(4-vinylpyridine)-b- poly(ε-caprolactone) Hybrid SystemRong-Ming Ho, Tao Lin, Meng-Ru Jhong, Tsai-Ming Chung, Bao-Tsan Ko, and Yi-Chun ChenView Author Information Department of Chemi…
Lead chalcogenide (PbS, PbSe, and PbTe) nanocrystals were synthesized by sequential implantation of Pb and one of the chalcogen species into pure silica. The implantation energy and fluence were chosen so that the implantation profiles practically overlap at a depth approximately 150 nm with a maximum concentration of…
Poly(isoprene- b -styrene- b -ethylene oxide) (ISO) triblock copolymers were blended with poly(styrene) and poly(isoprene) homopolymers at compositions close to those previously shown to produce triply periodic, multiply continuous network phases. Homopolymer molecular weights were approximately equal to the correspon…
Using a combinatorial screening method based on the self-consistent-field theory for polymers, we study the bulk morphology and the phase behavior of π-shaped ABC block copolymers, in which A is the backbone and B and C are the two grafts. By systematically varying the positions of the graft points, the π-shaped block…
The spontaneous fractal aggregation of as-prepared cetytrimethylammonium bromide (CTAB)-capped gold nanoparticles was found to happen at the air/water interface after spreading their chloroform solution on water surfaces. Aided by Langmuir-Blodgett techniques, these fractal aggregates can be interconnected with each o…
We report the crystal structure and physical properties of the 2:1 FeCl4- salt of a new donor molecule, EDO-TTFVO. Crystal structure analysis of this salt revealed that the donor molecules formed a beta' '-type two-dimensional conducting layer, and there is a short S...Cl contact between the donor molecules and the Fe…
This paper demonstrates the ability to grow silica directly on a deposited surface of polyelectrolyte. Using this strategy, we describe the deposition of layered polyelectrolyte-silica coating on negatively charged surfaces of polystyrene particles and latex nanocapsules, which could not be coated directly with silica…
The fluorescence of single chains of the conductive polymer poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) was studied by means of single-molecule spectroscopy at 15 K. MEH-PPV was deposited onto a surface from a toluene solution and covered with a polymer cap layer of poly(vinyl alcohol) spin-c…
Carboxylic acid-functionalized SWNTs prepared via the reaction of an amino acid, NH2(CH2)nCO2H, with fluoronanotubes show similar levels of sidewall functionalization; however, the solubility in water is controlled by the length of the hydrocarbon side chain (i.e., n). The 6-aminohexanoic acid derivative is soluble in…
We first present the preparation of a new class of polyaniline (PANI)/titanium nitride (TiN) nanocomposites by in situ chemical polymerization in the presence of TiN nanoparticles. It was found that nanocrystalline TiN with an average diameter of approximately 20 nm incorporated and dispersed homogeneously within the…
Culture of A7r5 smooth muscle cells on a polyelectrolyte multilayer film (PEMU) can influence various cell properties, including adhesion, motility, and cytoskeletal organization, that are modulated by the extracellular matrix (ECM) in vivo. ECM contribution to cell behavior on PEMUs was investigated by determining th…