Materials Literature
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The non-emissive platinum(II)–quaterpyridine complex shows strong photoluminescence at room temperature upon incorporation into Nafion membrane; this complex is stabilized toward photochemical decomposition in Nafion even in the presence of oxygen, and can be used as a sensitizer to generate singlet oxygen to oxidize…
Mesoporosu (MCM-41 type) silica containing surfactant-embedded Congo Red has been prepared and tested against gas phase HCl and ammonia, as well as solutions of ionic species; it is shown that the hybrid (organic-inorganic) material is permeable to both gases and ionic species, and can act as a pH indicator and as a s…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMeta-Activated Nucleophilic Aromatic Substitution Reaction: Poly(biphenylene oxide)s with Trifluoromethyl Pendent Groups via Nitro DisplacementIm Sik Chung and Sang Youl KimView Author Information Center for Advanced Functional Polymers Department of Chemistry and Scho…
The first, single-step, hydrothermal synthetic process has been developed, whereby phase-pure polycrystalline samples of CuAlO2 can be synthesized at low temperature (<215 °C) and pressure (<10 atm). Furthermore, the solid solution CuAl1-yGayO2 (where 0 ≤ y ≤ 1), which has, to date, not been reported, was also synthes…
Hybrid organo-silica materials possessing uniform nanoscale porosity in the super-micropore size range (1.0-2.0 nm diameter) have been prepared using neutral alkylamine and non-ionic alkyl(phenyl)polyethylene oxide surfactants as structure-directing agents.
An Aurivillius phase, Bi(2)SrTa(2)O(9), which consists of perovskite-like slabs and bismuth oxide sheets, was treated with 3 M hydrochloric acid for 72 h, and the resultant product was characterized. Scanning electron microscopy investigation indicated that no morphological change occurred during the acid treatment. X…
New polynuclear molybdenum(VI) and tungsten(VI) complexes with 3-hydroxypicolinic acid (HpicOH) (nBu4N)2[Mo4O12(picOH)2] 1, (nHex4N)2[Mo2O6(picOH)2] 2, (BezPh3P)2[W2O6(picOH)2] 3 (Bez = benzyl) and [M2O5(picOH)2]·nH2O (M = Mo(VI), n = 2 4 or W(VI), n = 8 5) have been prepared. The crystal structures of 1 and 2 were de…
A variety of new cellulose solvents was investigated toward their potential as media for the functionalization of the polyglucane. Thus, mixtures of dimethyl sulfoxide (DMSO)/tetrabutylammonium fluoride trihydrate (TBAF), N-methylmorpholine-N-oxide (NMMNO)/DMSO, melts of LiClO(4).3H(2)O, and aqueous solutions of Ni(tr…
The temperature-composition phase diagrams of aqueous solutions of gelatin and dextran, which show liquid/liquid phase segregation, were explored at temperatures above the gelation temperature of gelatin. The compositions of the coexisting phases were found to show practically no dependence on temperature between 40 a…
The time scale of covalent state relaxation and singlet fission into triplet pairs is determined in a solution of isolated polydiacetylene chains showing a remarkably sharp excitonic transition by applying the transient transmission difference spectroscopy technique with sub-10 fs optical pulses. Photoexcitation into…
A series of rhenium(I) surfactant complexes, fac -[Re(CO) 3 (N−N)(L)]PF 6 (N−N = diimine, L = pyridyl ligand), with various azo- and stilbene-containing ligands have been synthesized and their photophysical properties studied. The X-ray crystal structure of the complex fac -[Re(CO) 3 (bpy)(L)]PF 6 (bpy = 2,2‘-bipyridi…
The aim of this work is to investigate the microstructure development of cerium oxide nanocrystal, prepared by the microemulsion process, as a function of annealing temperature in air. Combined with the HRTEM and the thermogravimetric−differential thermal analysis (TG−DTA), the XRD patterns reveal that the sample anne…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFree-standing Single Crystal Silicon NanoribbonsWensheng Shi, Hongying Peng, Ning Wang, Chi Pui Li, Lu Xu, Chun Sing Lee, Rafi Kalish, and Shuit-Tong LeeView Author Information Center Of Super-Diamond and Advanced Films (COSDAF) and the Department of Physics and Materi…
The vortex-liquid and vortex-solid phases in single crystals of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ placed in tilted magnetic fields are studied by in-plane resistivity measurements using the Corbino geometry to avoid spurious surface barrier effects. It was found that the anisotropy of the vortex-solid phase increases with…
This paper focuses on mechanical aspects of chromatin biological functioning. Within a basic geometric modeling of the chromatin assembly, we give for the first time the complete set of elastic constants (twist and bend persistence lengths, stretch modulus and twist-stretch coupling constant) of the so-called 30-nm ch…
We demonstrate experimentally the electrical ballistic electron spin injection from a ferromagnetic metal / tunnel barrier contact into a semiconductor III-V heterostructure. We introduce the Oblique Hanle Effect technique for reliable optical measurement of the degree of injected spin polarization. In a CoFe / Al2O3…
A linear bubble model of grain growth is introduced to study the conditions under which an isolated grain can grow to a size much larger than the surrounding matrix average (abnormal growth). We first consider the case of bubbles of two different types such that the permeability of links joining unlike bubbles is larg…
Microbolometers respond to variations in impinging infrared energy through changes in the temperature of their thermally isolated detector structure. Thus, variations in the temperature of the substrate give rise to erroneous detector output variations. In order to minimize these effects, microbolometers are thermally…
A unit cell of a spinel ferrite is just under 1 nm, actually about 0.8 nm. Particles approaching this size can be expected to possess properties that differ from the bulk material. Bulk polycrystalline Zn-ferrite ( ZnFe 2 O 4 ) has been ball milled; after 50 h the average particle size is about 13 nm. The 57 Fe Mössba…
We have prepared (Sm-Co)/Co multilayers with two different Co thicknes to study the hard magnetic properties (coercivity H ci and energy product BH max ) of nanostructured SmCo magnets consisting of hard SmCo and softer higher moment Co phases. Samples are annealed at a temperature in the range 450 – 700°C, for 20 min…