Materials Literature
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We have investigated the phase transition between two distinct mesoporous silicas: SBA-15, comprising a hexagonally packed arrangement of cylindrical pores (6−12 nm in diameter), and mesocellular silica foams (MCF), consisting of spherical voids (22−42 nm in diameter) interconnected by “windows” of ∼10 nm. Both SBA-15…
The switching effects in Sb x Se 1- x (0⩽ x ⩽0.9) thin films have been investigated. The annealing of the films at 323 K improves the switching characteristics and decreases the threshold voltage V th . The threshold switching voltage and threshold activation energy ε s were found to decrease linearly on increasing th…
Some of the physical properties of x CuO-50 PbO-(50- x )B 2 O 3 glasses were studied. The transformation temperature shows a minimum value at about 20 mol% CuO. The infrared spectra reveal that in this glass the fraction of four-coordinated boron atoms would be minimal. Up to a content of 30 mol% CuO there is a limite…
Chlorocobalt(III) tetraphenylporphyrin, (Cl)CoIIITPP, reacts with potassium cyanide in dichloromethane or benzene containing 18-crown-6 to give a green solution of [crown-K+][(CN)2CoIIITPP-]. The molecular structure of [crown-K+][(CN)2CoIIITPP-] is identified by X-ray crystallography. In methanol, (Cl)CoIIITPP plus KC…
In this study, we synthesized the mesoporous materials under a shear flow at relatively low temperatures using the wormlike micellar solution of a cationic surfactant cetyltrimethylammonium bromide (CTAB). The additive sodium salicylate (NaSal) enhanced the microstructure evolution by forming the micron-order flexible…
The thermal stability of rabbit skeletal muscle glycogen phosphorylase b was characterized using enzymological inactivation studies, differential scanning calorimetry, and analytical ultracentrifugation. The results suggest that denaturation proceeds by the dissociative mechanism, i.e., it includes the step of reversi…
Metal nanoparticles grown within the nanostructured matrix of the amphiphilic polymer poly(octadecylsiloxane) (PODS) are investigated here by transmission electron microscopy. Due to its silanol groups and alkyl chain, PODS forms a bilayered nanostructure containing an intercalated layer of water within an aqueous env…
Rare earth elements find a wide range of applications in metallurgy, fuel cells, the coloring of glass and ceramics, and the production of magnets, but their separation is difficult, leading to high prices. In his Perspective, Fray discusses the separation process reported by Uda et al., which greatly reduces the numb…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLiquid-Crystalline Ion-Conductive Materials: Self-Organization Behavior and Ion-Transporting Properties of Mesogenic Dimers Containing Oxyethylene Moieties Complexed with Metal SaltsToshihiro Ohtake, Yasuyuki Takamitsu, Kaori Ito-Akita, Kiyoshi Kanie, Masahiro Yoshizawa, Tomohi…
The pulsed laser deposition (PLD) of Y 2 O 3 from a pure yttrium ablation target is performed for the first time and is shown to replace advantageously PLD from yttria targets. The films were grown on optical-quality MgO(100) and sapphire(0001) substrates, the former yielding films with poorer crystalline quality beca…
Two-dimensional spatially resolved microfocus X-ray diffraction has been used to investigate spherulites of pure bacterial poly(3-hydroxybutyrate) (PHB) and of a blend of natural and synthetic atactic PHB (a-PHB) crystallized at a relatively high temperature (Tc = 140 degrees C). Both samples investigated contained pr…
Additional results have been determined for a previously developed model of dendrimers constructed on the diamond lattice. Accurate results are presented through G = 8 generations, and some suggestive results at G = 9 and G = 11 are also reported. The hydrodynamic radius and intrinsic viscosity have been computed acco…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLight-Emitting Meso-Structured Sulfides with Hexagonal Symmetry: Supramolecular Assembly of [Ge4S10]4- Clusters with Trivalent Metal Ions and Cetylpyridinium SurfactantK. Kasthuri Rangan, Pantelis N. Trikalitis, and Mercouri G. KanatzidisView Author Information Departm…
New functional aliphatic polyesters were prepared by chemical modification of brominated copolyesters. Poly(ε-caprolactone)- co -poly(γ-(2-bromo-2-methylpropionate)-ε-caprolactone) copolymer was prepared and successfully converted into copolyester bearing methacrylate double bonds by dehydrohalogenation of the pendant…
The surface-enhanced Raman scattering (SERS) spectra for phthalimide (PIMH) vacuum evaporated, cast onto silver island films, and from colloidal silver are clearly identified with the formation of a phthalimide−silver complex (chemisorption). The phthalimide−silver complex (PIMAg) has been obtained from the PIMH potas…
In this paper we investigate the self-aggregation of tetracationic porphyrin meso -tetrakis( N -methylpyridinium-4-yl)porphinatocopper(II) (CuT4) onto a chiral polymeric matrix (polyglutamic acid, PG) as well as mixtures of tetracationic (CuT4) and tetraanionic, meso -tetrakis(4-sulfonatophenyl)porphine (H 4 TPPS), po…
A new approach to creating patterned composite structures with layer-by-layer assembled thin films is introduced. In this approach, the top surfaces of layer-by-layer films are chemically patterned by the direct stamping of functional polymers on the surface. The resulting pattern is then used as a template for the fu…
Electrochemically grown films of polyaniline, polypyrrole, polythiophene, and poly(ethylenedioxythiophene) were treated with alkane- and fluoroalkanethiols for 1−24 h. The resulting films showed surface energies and polarities similar to glass slides coated with monolayers of the corresponding alkyl- and fluoroalkylsi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Explosive "Inert" Anion CB11(CF3)12-Benjamin T. King and Josef MichlView Author Information Department of Chemistry and Biochemistry University of Colorado, Boulder, Colorado 80309-0215 Cite this: J. Am. Chem. Soc. 2000, 122, 41, 10255–10256Publication Date (Web):S…
Nanosize pore arrays have been prepared by the self-organization process of aluminium anodic oxidation. The symmetry of the pore configuration has been analysed by using fast Fourier transformation. For different anodization temperatures, it has been found that lower temperatures yielded higher symmetry. The linear re…