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。
The possibility of using polysorbate 80-coated polybutylcyanoacrylate nanoparticles to deliver low molecular polar hydrophilic drugs to the CNS has been studied. Tubocurarine (a quaternary ammonium salt) does not penetrate the normal intact blood-brain barrier. However, the injection of this drug directly into the cer…
To further examine the structural and thermodynamic basis of hydrophobic stabilization in proteins, all of the bulky non-polar residues that are buried or largely buried within the core of T4 lysozyme were substituted with alanine. In 25 cases, including eight reported previously, it was possible to determine the crys…
Truncated rhombic dodecahedral crystals of the mesoporous molecular sieve MCM-48 are synthesised by a hydrothermal procedure using sodium silicate, hexadecyltrimethylammonium bromide and various kinds of alcohol.
A novel mesoporous silica with a tubular structure has been prepared using organic gel fibers as a template.
Aligned-nanotube bundles have been obtained in copious quantities by the pyrolysis of ferrocene or ferrocene–acetylene mixtures.
The isomorphous rutile-related network structures of Co(dca)2, Ni(dca)2 and Cu(dca)2, dca = dicyanamide, N(CN)2–, are shown to behave as ferromagnets (Tc = 9 and 20 K) and a near-paramagnet, respectively.
Directing the structure and function of polythiophenes (PTs) can lead to remarkable enhancements in the electronic and photonic properties of the resultant materials, as discussed in this comprehensive review of the chemistry and synthesis of PTs. The Figure illustrates the use of heteroatom-functionalized PTs as chem…
The hydrolytic sol-gel polymerization of molecular organosilicon precursors with a rigid geometry C6H4[Si(OMe)3]2-1,4 and C6H3[Si(OMe)3]3-1,3,5 2 was investigated and compared to the results obtained with precursors having a more flexible structure C6H4RR-1,4 [R=R=CH2Si(OMe)3 3; R=R=CH2CH2Si(OMe)3 4]. Compounds 1-4 ha…
The corrosion behavior of austenitic Fe-(17 wt% to 31 wt%) Mn-(1 wt% to 9 wt%) Al-(1 wt% to 7 wt%) Cr alloys in different aqueous solutions and the corrosion protection mechanism induced by adding Al or Al and Cr, were studied by anodic polarization and Auger electron spectroscopic/x-ray photo-electron spectroscopic (…
A highly conducting partially oxidized salt of TPP[Co(Pc)(CN)2 ]2 can be obtained by electrocrystallization of TPP[Co(Pc)(CN)2 ]. The crystal is composed of one-dimensional TPP arrays surrounded by slipped-stacked one-dimensional [Co(Pc)(CN)2 ] chains. The electrical conductivity at room temperature is quite high, 120…
A B S T R A C T: Arid soils in central Iran that evolved from the weathering ofpost-Tethyan sediments contain palygorskite. Clay fractions of gypsiferous oils and their associated sediments from different landforms from central Iran were investigated. Palygorskite was the dominant silicate clay mineral in clay fractio…
The evolution and interdependence of microstructure, stress, and bonding defects of heteroepitaxial diamond films deposited on silicon substrates has been investigated by applying scanning electron microscopy, transmission electron microscopy (TEM), and micro-Raman spectroscopy to the same places in the films. For thi…
Inelastic neutron-scattering spectra were measured to obtain the phonon density of states (DOS) of nanocrystalline fcc ${\mathrm{Ni}}_{3}\mathrm{Fe}.$ The materials were prepared by mechanical alloying, and were also subjected to heat treatments to alter their crystallite sizes and internal strains. In comparison to m…
The synthesis of the one-dimensional K 2 Hg 3 Q 4 (Q = S, Se) and Cs 2 Hg 3 Se 4 and the three-dimensional A 2 Hg 6 S 7 (A = K, Rb, Cs), and A 2 Hg 6 Se 7 (A = Rb, Cs) in reactive A 2 Q x fluxes is reported. Pale yellow, hexagonal plates of K 2 Hg 3 S 4 crystallize in space group Pbcn, with a = 10.561(5) Å, b = 6.534(…
Simultaneous TG-MS (TG: thermogravimetry, MS: mass spectrometry) measurement, a mass spectrometer connected with a thermogravimetry by a transfer line and an interface or by the skimmer coupling, was used to investigate decomposition of urea.A simple decomposition reaction of urea to form ammonia and cyanic acid (or i…
A system for measuring the sensitivity of electric field sensors at UHF using a novel gigahertz transverse electromagnetic (GTEM) cell is described. The system was developed to enable calibration of UHF couplers that are used to detect insulation defects in gas insulated substations. The frequency response of a sensor…
Pierre A. Zippi, Freshwater Algae from the Mattagami Formation (Albian), Ontario: Paleoecology, Botanical Affinities, and Systematic Taxonomy, Micropaleontology, Vol. 44, Supplement 1: Freshwater Algae from the Mattagami Formation (Albian), Ontario: Paleoecology, Botanical Affinities, and Systematic Taxonomy (1998), p…
Carbon nanotubes are unique nanostructures with remarkable electronic and mechanical properties. Interest from the research community first focused on their exotic electronic properties, since nanotubes can be considered as prototypes for a one-dimensional quantum wire. As other useful properties have been discovered,…
A high-resolution computerized calorimeter capable of fully automatic operation in either ac or relaxation modes is described. Emphasis is given to a new version of the relaxation technique in which the heater power is ramped linearly in time. This improvement results in superior performance and convenience in studyin…
A method for dynamically updating the boundary conditions of atomistic simulations is presented. The lattice Green's function boundary relaxation method, originally introduced by Sinclair et al. in 1978, is extended to treat three-dimensional (3D) simulations. The boundary conditions for two-dimensional (2D) and 3D de…