Materials Literature
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Cadmium metal nanocrystallites (NCs), prepared on graphite surfaces by electrochemical deposition, are employed as precursors to synthesize core−shell nanoparticles consisting of a crystalline cadmium sulfide (CdS) core and a sulfur or polysulfide shell. Core−shell NCs having a large CdS core (radii R CdS > 40 Å) were…
The preparation of optically active poly(isocyanide)s derived from chiral promesogenic monomers is reported. Remarkably, the stereogenic carbon atom in the monomer is able to pass its chiral “information” to the growing polymer backbone which is at least 14 atoms (approximately 16 Å) remote from it. The sense of helic…
The synthesis and characterization of the rod−coil molecules of ethyl 4-[4-[oxypoly(propyleneoxy)propyloxy]-4‘-biphenylcarboxyloxy]-4‘-biphenylcarboxylate with poly(propylene oxide) coil of 7 ( 7-P-4 ), 8 ( 8-P-4 ), 10 ( 10-P-4 ), 12 ( 12-P-4 ), 15 ( 15-P-4 ), 17 ( 17-P-4 ), and 20 ( 20-P-4 ) propylene oxide units are…
We report mechanical detection of ferromagnetic resonance signals from microscopic Co single layer thin films using a magnetic resonance force microscope (MRFM). Variations in the magnetic anisotropy field and the inhomogeneity of were clearly observed in the FMR spectra of microscopic Co thin films 500 and 1000 angst…
We propose a two dimensional frame-invariant phase field model of grain impingement and coarsening. One dimensional analytical solutions for a stable grain boundary in a bicrystal are obtained, and equilibrium energies are computed. We are able to calculate the rotation rate for a free grain between two grains of fixe…
Poly(arylene ether ketone)s with pendant, monodisperse oligobenzamide and oligobenzoate side chains facilitated a study of the effect of hydrogen bonding on chain interactions. A stepwise condensation reaction between acid chlorides and amine or alcohol functions was used to synthesize new series of carboxy-terminated…
The tetragonal states produced by isotropic pseudomorphic epitaxial strain in the (001) plane on a tetragonal phase of a crystal are calculated for V, Ti, Rb, Li, K, Sr from first-principles electronic theory. It is shown that each metal has two tetragonal phases corresponding to minima of the total energy with respec…
The thickness evolution of in-plane magnetization reversal in ultrathin films is studied with a theoretical model that takes account of surface roughness typical of epitaxial growth. Guided by Néel's model, step edge sites of monolayer-height islands are assigned a two-fold anisotropy in addition to a four-fold anisot…
In this work, we have used an oligomer model compound approach for the understanding of the vibrational spectra of the principal forms of polyaniline. Selected model compounds have been studied by Raman and infrared (IR) spectroscopies. The observed vibrational bands are assigned to the expected modes, by revealing th…
The reaction of [M II (OH 2 ) 6 ](NO 3 ) 2 (M = Co, Ni) and [N(CN) 2 ] - leads to formation of isomorphous M[N(CN) 2 ] 2 [M = Co ( 2a ), Ni ( 3 )], respectively, while the reaction of [Co II (OH 2 ) 6 ](NO 3 ) 2 in 1% pyridine (py) solution with [N(CN) 2 ] - leads to the formation of Co[N(CN) 2 ] 2 py 2 . The structur…
Voltammetry of nonspecifically adsorbed and of freely diffusing monolayer protected clusters (MPCs) is presented. The MPC monolayers are mixtures of n -octanethiolates and ω-functionalized ferrocenyloctanethiolates. MPC adsorption coverages range from a few percent to roughly a full monolayer of cluster molecules. Rot…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAcid−Base Catalysis in the Synthesis of Arylmethylene and Alkylmethine PyrrolesClaudius D'Silva and Deborah A. WalkerView Author Information Department of Chemistry & Materials, the Manchester Metropolitan University, Faculty of Science and Engineering, John Dalton Building, Ch…
Formation of clusters of interlayer interstitial carbon atoms in graphite is studied by means of molecular dynamics simulation. It is shown that the deformation potential is attractive for interstitials located in one interlayer region and repulsive for interstitials located in different interlayer regions. As a resul…
Model dipole−dipole coupling calculations of infrared spectra for various ordered CO packing arrangements on Pt(111) have been undertaken as a function of the spatial dimensions of isolated nanoscale adlayer domains. Comparisons of some of these predictions with coverage (θ CO )-dependent infrared spectra obtained upo…
Methylnickel complexes activate the C(O)−H function of 2-diphenylphosphinobenzaldehyde to form five-membered chelate rings Ni(Ph 2 P⌒C O) which occupy OC-axial and P-equatorial positions in the trigonal bipyramidal configuration of nickel(d 8 ) compounds Ni(Ph 2 P⌒C O)X(PMe 3 ) 2 (X = Cl ( 1 ), Br ( 2 ), I ( 3 ), Me (…
The binary blends of poly(ethylene terephthalate) (PET) and poly(ether imide) (PEI) were miscible in the melt but showed simultaneous crystallization and liquid−liquid demixing below the melting point. In this study, the morphological structure induced by the coupling of crystallization and liquid−liquid phase separat…
Catalytic activities of K 2 CO 3 supported on several oxides and carbon itself were studied for the combustion of carbon at 673−773 K. K 2 CO 3 supported on a perovskite oxide, La 0.8 Sr 0.2 Cr 0.5 Mn 0.45 Pt 0.05 O 3 (LSCMP), exhibited higher activity than that supported on the other supports including carbon itself…
The magnesium complex (1) of the tetranucleating macrocyclic ligand H4L1 on transmetalation with copper(II) perchlorate in the presence of triethylamine produces the dicopper(II) complex (3) of the dinucleating macrocyclic ligand H2L3, while the same reaction when carried out in absence of triethylamine affords the me…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFirst Facile Synthesis of Biomimetic Poly-(R)-3-hydroxybutyrate via Regioselective Anionic Polymerization of (S)-β-ButyrolactoneZbigniew Jedliński, Piotr Kurcok, and Robert W. LenzView Author Information Centre of Polymer Chemistry,…
Bonding amorphous polystyrene (PS) and poly(2,6-dimethyl 1,4-phenylene oxide) (PPO) has been carried out in a broad range of temperatures and contact times ( t ), but always below the glass transition temperature ( T g ), in a lap−shear joint geometry. Strength at the symmetric and asymmetric polymer/polymer interface…