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。
Ibuprofen microcrystals sized between 5 and 40 μm have been encapsulated with polyelectrolyte multilayers (PEM) for the purpose of controlled release. The encapsulation was accomplished by a novel coating technology based on layer-by-layer assembly of oppositely charged polyelectrolytes. The biocompatible polyelectrol…
Interesting experimental properties of the incommensurate phase in ferroelectric ${\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{\mathrm{Se}}_{6}$ are explained in the framework of Landau-type phenomenological theory. The unique procedure of multilevel genetic-algorithm optimization is implemented to find parameters of the thermod…
The early stage of crystallization is the formation of three-dimensional (3D) nu clei in the mother phase (vapor, solution, melt); the second step is represented by the advancement of the faces bounding these nuclei. Nucleation and growth are not equilibrium processes: crystal nucleation can occur within a supersatu…
Continuing our study on the electronic structure of the carbides BC and AlC ( Tzeli, D.; Mavridis, A. J. Phys. Chem. A 2001, 105, 1175), we have investigated the electronic structure of 29 and 30 excited states of the BC and AlC molecules, respectively, by ab initio quantum mechanical multireference methods and quanti…
Nanoporous silica was formed into micropatterned thin films based on the area-selective growth of silica−organic nanocomposite films and the subsequent elimination of the organic components. To eliminate organic molecules from the nanocomposite, a photochemical approach, that is, “photocalcination”, using a vacuum ult…
The preparation and characterization of a new series of mixed metal cofacial anthracene-bridged diporphyrins (DPA) containing a GaL fragment (L = OMe, OH) and another metallic center (M = GaL, Ru(CO)(OH), Co, and H(2) (i.e. free base)) are reported. The luminescence properties at 298 and 77 K, in degassed EtOH solutio…
We report the formation of monomeric and J-aggregated 1,1‘,3,3‘-tetraethyl-5,5‘,6,6‘-tetrachlorobenzimidazolocarbocyanine (referred to as TTBC) encapsulated within an aluminosilicate mesostructure, specifically MCM-41, under different pH conditions. It was necessary to stabilize the synthesized MCM-41 through use of a…
Abstract A random terpolymer of L ‐lactide (LL), ϵ‐caprolactone (CL) and glycolide (G) has been synthesized in bulk at 130 °C using stannous octoate as the coordination–insertion initiator. The terpolymer, poly(LL‐ ran ‐CL‐ ran ‐G), has been characterized by a combination of analytical techniques: GPC, 1 H NMR, 13 C N…
The crystal structure and electronic properties of Ag 2 V 4 O 11 have been explored by means of x-ray four-circle diffraction and through measurements of electrical resistivity, thermoelectric power, magnetization, and electron paramagnetic resonance. The crystal data for the nearly stoichiometric compound show a mono…
On the basis of an analysis of theoretical and numerical studies of model systems and of experiments on superconductivity in doped ${\mathrm{C}}_{60},$ polyacenes, and the cuprate high-temperature superconductors, we propose that a purely electronic mechanism of superconductivity requires structures at an intermediate…
A series of trigonal bipyramidal pentanuclear complexes involving the alkoxo-diazine ligands poap and p3oap, containing the M(5)[mu-O](6) core is described, which form by a strict self-assembly process. [Co(5)(poap-H)(6)](ClO(4))(4).3H(2)O (1), [Mn(5)(poap-H)(6)](ClO(4))(4).3.5CH(3)OH.H(2)O (2), [Mn(5)(p3oap-H)(6)](Cl…
We have carried out numerical simulations on the effective transport properties of composites consisting of well separated conductive spherical inclusions in an insulating matrix. The simulations show that the effective permittivity depends markedly on the size distribution of the inclusions. Results are presented in…
Porous GaP, InP and GaAs structures fabricated by MeV ion-implantation-assisted electrochemical etching were investigated by Raman and Fourier transform infrared spectroscopy. Fröhlich modes in the frequency gap between the transverse optical and longitudinal optical frequencies were observed and their longitudinal-tr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTApproach to a Single-Component Ferrimagnetism by Organic Radical CrystalsYuko Hosokoshi, Keiichi Katoh, Yasuhiro Nakazawa, Hiroki Nakano, and Katsuya InoueView Author Information Institute for Molecular Science Nishigonaka 38 Myodaiji Okazaki 444-8585, Japan Research C…
Reflectivity spectra of layered MoO 3 single crystals have been measured at 6 K in a wide energy range up to 25 eV. The spectra exhibit remarkable anisotropy for the polarization E ∥ c and E ∥ a . Optical constants have been derived through the Kramers-Kronig analysis. The fundamental absorption tail located below 3.7…
Ground- and excited-state absorption and fluorescence properties of three free base porphyrins with graded degrees of a macrocycle distortion have been studied. The different degrees of nonplanarity were introduced by successive addition of ethyl groups at the β-pyrrole positions of free base 5,10,15,20-tetraphenylpor…
The cationic ring-opening polymerization of 3-ethyl-3-(hydroxymethyl)oxetane to form hyperbranched polyethers has been studied. The polymerizations have been performed in bulk using sulfonium salt initiators. To produce polymers of different degrees of branching, the reaction conditions (reaction temperature and initi…
The zero-point static vibrational averaging (ZPVA) correction to the (hyper)polarizability is written in first-order as the sum of two contributions, one involving electric field derivatives, and the other a sum over normal coordinate derivatives of the zero point energy. It is shown that the sum over 3N-6 normal mode…
Large magnetic entropy changes were observed in RCoAl compounds, where R = Gd, Tb, Dy, and Ho, at their Curie temperatures. These RCoAl alloys have a hexagonal, MgZn 2 structure and their Curie temperatures fall in the temperature range 10-100 K. A `table-like' behaviour was found in the temperature dependence of the…
Two-dimensional, hexagonally ordered silicas with large uniform mesopores (7.6−11.9 nm) have been assembled through a nonionic supramolecular assembly pathway using sodium silicate as a silica source and the triblock copolymer Pluronic P123 (EO 20 PO 70 EO 20 ) as a structure-directing agent. An increase in the synthe…