Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We present results of density-functional tight-binding calculations on small titanium carbohedrene clusters (Ti metcars) TimCn with m = 7, 8 and n = 10–14. The structure optimization was performed within our newly developed genetic algorithm, which operates on a given (randomly chosen) population of clusters to genera…
Excited state phthalocyanine complexes comprising (tetra-tert-butylphthalocyaninato)zinc (ZnPc) coordinated by nitroxide radicals have been studied by time-resolved electron paramagnetic resonance (TREPR). Five ZnPc complexes coordinated by an axial ligand containing a nitroxide radical NRX (where X (= 4, 5, 6, 8 or 1…
Infrared optical spectra have been investigated for a charge-transfer complex of tetrathiafulvalene and 2-bromo-3,5,6-trichloro- $p$-benzoquinone, which undergoes a neutral-ionic ( $N\ensuremath{-}I$) transition at ${T}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}68\mathrm{K}$. With the decrease of temperatu…
We analyse a simplified dynamical model that emulates the overall process of self-assembly of amphiphilic molecules into micelles under non-equilibrium conditions. The study is motivated by a review of experimental evidence in the literature for the occurrence of bistability and hysteresis in diverse self-assembling m…
The cation distribution in dehydrated NaX was predicted using appropriate interatomic potentials and (N,V,T) simulations, considering the cations as 'guest' particles and the framework as a 'host'; the simulations not only yield the expected different types of sites, but also highlight the cooperative placement of sup…
Five-layered nanocrystals have been prepared that consist of a CdS core covered by a shell of HgS followed by several monolayers of CdS that are covered by again a shell of HgS and an outer cladding layer of CdS. The resulting quantum dots, thus, contain a double well electronic structure. Both HgS wells are either as…
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…