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。
A giant magnetic-field-induced strain (MFIS) of −3100 ppm has been obtained in Heusler alloy Ni52Mn22.2Ga25.8 single crystal in the [001] direction at a temperature from 23 to 31 °C. This MFIS reaches saturation in an applied field about 6 kOe, and exhibits the same amplitude with an opposite sign while the field is p…
Silicon carbide (SiC) nanowires on a silicon substrate were prepared using hot-filament-assisted chemical-vapor deposition with a solid silicon and carbon source. The SiC nanowires show good field-emitting properties as revealed by the current–voltage characteristics. Together with its ease of preparation, these SiC n…
We have investigated the diffuse phase transition accompanying the formation of submicrometric ferromagnetic-metallic (FM) domains embedded in the antiferromagnetic charge-ordered state in ${\mathrm{Nd}}_{1/2}{\mathrm{Ca}}_{1/2}{\mathrm{MnO}}_{3}$ crystals, which is caused by quenched random field originating from Cr…
The linear viscoelastic and diffusional properties of colloidal model dispersions are investigated and possible relations between the (dynamic) shear viscosity and various diffusion coefficients are analyzed. Results are presented for hard sphere and charge-stabilized dispersions with long-range screened Coulomb inter…
The interplay between inter- and intrachain charge transport in bulk polythiophene in the hopping regime has been clarified by studying the conductivity $\ensuremath{\sigma}$ as a function of frequency $\ensuremath{\omega}/2\ensuremath{\pi}$ (up to 3 THz), temperature $T$, and doping level $c$. We present a model whic…
We demonstrate long-term field emission stability from single-walled carbon nanotubes. Unballasted nanotubes operate without degradation for over 350 h at 10−9 Torr. Nanotubes are shown to be significantly less sensitive to operating environments than metallic emitters. In 10−7 Torr of H2O, we demonstrate 100 h of con…
Gold nanoshells, nanoparticles consisting of a silica core coated with a thin gold shell, exhibit a strong optical resonance that depends sensitively on their core radius and shell thickness. Gold nanoshells have been fabricated with a peak optical extinction that can be varied across the near-infrared region of the s…
A new self-designed mechanochemical reactor, inlaid pan-mill, was used in studying high density polyethylene (HDPE) and calcium carbonate (CaCO3) blends. The effects of CaCO3 on the crushing and structure of HDPE matrix and the properties of HDPE/CaCO3 blends were investigated. Scanning electron microscopy, Fourier tr…
The graft copolymerization of methyl methacrylate upon gelatin was studied using benzoyl peroxide as an organic initiator in aqueous medium. The grafting reactions were carried out within the 65–90°C temperature range, and the effect of monomer and initiator concentrations on the graft yield were also investigated. Th…
Electron beam irradiation of polytetrafluoroethylene (PTFE) has been performed in vacuum both at elevated temperature above the melting point of PTFE and at room temperature for comparison. The changes in the chemical structure were studied by Fourier-transform infrared (FTIR) spectroscopy. The formation of double bon…
Mica was incorporated in ABS/PC:65/35 blends prepared on a Haake Torque Rheometer System 9000 with Rheomix 600 mixer. To improve the polymer/filler interaction, a treatment using silane on mica surface was performed. Studies were conducted concerning mechanical properties (flexural and impact strength), thermal proper…
The research presented in this paper investigates the effect of thermally accelerated aging on the submicrostructure of cellulose and attempts to relate such changes to the well-documented loss of mechanical strength in aged paper. Filter paper and ramie fibers samples were aged in vacuo at 160°C. Small angle X-ray sc…
The effects of various fillers (SRF black, silica, and clay) and plasticizers (dibutyl phthalate and dioctyl phthalate) on the mechanical, dynamic mechanical, and rheological properties and on the heat and oil resistance of the thermoplastic elastomeric reactive blends of nylon-6 and acrylate rubber (ACM) were investi…
The molecular structure of dimethyl sulfoxide at liquid nitrogen temperature has been obtained from the Raman spectra of dimethyl sulfoxide intercalated kaolinites by the use of Raman microprobe and a low temperature thermal stage. Raman bands at 2917 and 2935 cm -1 for the symmetric stretching and four bands at 2999,…
Ge/Si−R and Ge/SiO 2 core−shell nanoparticles have been synthesized by a solution route from the stepwise reactions of the Zintl salt, Mg 2 Ge, with SiCl 4 and subsequently either RLi (R = butyl) or H 2 O 2 . High-resolution transmission electron microscopy (HRTEM) images show that the core part of these Ge/Si−R and G…
A new approach to pore size and surface area analysis for hydrophobic mesoporous solids is proposed. Well-defined materials with strongly hydrophobic surfaces were prepared via chemical bonding of octyldimethylsilyl (ODMS) ligands to the surface of large-pore MCM-41 samples. Nitrogen statistical film thickness curves…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence Properties of Multinuclear Copper(I) CompoundsPeter C. Ford, Elena Cariati, and James BourassaView Author Information Department of Chemistry, University of California, Santa Barbara, California 93106-9510, and Centro C.N.R., CSSSCMTBSO, Universitá di Milan…
BIOMATERIALSNo one knows how the glasslike silica laceworks within the cell walls of diatoms are formed, but on page [1129][1], biochemists report new clues--silica-forming proteins dubbed silaffins that, when added to solutions of silicic acid, a silicon-containing organic compound, precipitate to form networks of mi…
Two oxothiophosphato anions are obtained from solutions containing the [Mo2S2O2]2+ precursor and phosphate ions. The monophosphato anion reveals a Mo10 decameric structure and the diphosphato anion, a Mo12 dodecameric one. Both compounds exhibit an open cavity containing the phosphate ions. A 31P NMR study in solution…
The hydrothermal reactions of V 2 O 5, H 2 C 2 O 4, Ni(NO 3 ) 2, ethylenediamine(en) or 1,2-diaminopropane(enMe) and water yield layered vanadium oxides with interlayer metal coordination complexes [Ni(en) 2 ] 0.5 [V 3 O 7 ] ( 1 ) and [Ni(enMe) 2 ] 0.5 [H 2 enMe] 0.5 [V 6 O 14 ] ( 2 ). 1 crystallizes in an orthorhombi…