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 rate-dependent deformations of the titanium alloy Ti-6A1-4V are investigated using a combination of standard testing machines and compression and torsional Kolsky bars. Both homogeneous and localized deformations of both non-porous (‘fully dense’) and porous (7.6% porosity) versions of the alloy are studied. The m…
Langmuir−Blodgett (LB) films of a series of divalent metal octadecylphosphonates have been prepared and characterized. The films are each shown to be LB analogs of known solid-state metal phosphonates possessing 2-dimensional ionic−covalent metal phosphonate layers. The metal phosphonate layers crystallize during the…
Abstract The mineralogy of bulk and rhizosphere soil materials was compared to assess the effect of roots on mineral weathering in a Podzol supporting a homogeneous Norway spruce [ Picea abies (L.) Karst] stand. Six horizons were sampled in two profiles at the Skogaby site in southwestern Sweden. The soil adhering to…
Pyrazinamide (pza) and 2-mercaptopyridine (2-MPy) are shown to form Ag colloid−adsorbate films at the interface between an aqueous Ag colloid and a solution of an adsorbate in dichloromethane. By contrast, under the same conditions, 4-mercaptopyridine (4-MPy) forms Ag organosol aggregates by the interface transfer of…
By applying the Maxwell Garnett model to gold nanoparticles in water we deduce a value of Im χi(3)=1.1×10-7 esu for the imaginary part of the cubic susceptibility for gold corresponding to a Fermi smearing mechanism. We also demonstrate a sign reversal in the nonlinear absorption for gold particles in 1, 1′, 3, 3, 3′,…
The structural characterization of samples of syndiotactic polypropylene (s-PP) isothermally crystallized from the melt is presented. Form I of s-PP, with variable amount of disorder, is obtained at every crystallization temperature. The limit ordered modification, characterized by a fully antichiral packing along bot…
Abstract Poly(ε‐caprolactone) was found to form inclusion complexes with α‐cyclodextrin to give crystalline compounds. The complexes are stoichiometric one‐to‐one (cyclodextrin: monomer unit) compounds. The yields of the complexes decreased with increasing the molecular weight of the polymer. They were characterized b…
An improved process for production of ICF Target Mandrels has been developed. Shells made from PAMS (poly-α-methylstyrene) are coated with GDP (glow discharge polymer). The PAMS is then removed by depolymerization and volatilization at 300°C, leaving a GDP mandrel. Compared to past polymer mandrels, this process yield…
Ionic conduction of trivalent aluminum in solid aluminum tungstate, Al 2 (WO 4 ) 3, has been directly and quantitatively demonstrated. Trivalent ions, especially for aluminum where the polarizability is considerably low, are strongly bonded in a crystal lattice and have been believed to be unlikely to exhibit migratio…
The photoexcitation in the oxygen-to-metal (M = Nb or W) charge transfer (O→M lmct) bands of two X-ray crystallographically characterized polyoxometalloeuropates, Na 7 H 19 {[Eu 3 O(OH) 3 (H 2 O) 3 ] 2 Al 2 (Nb 6 O 19 ) 5 }·47H 2 O and [Eu(H 2 O) 8 ] 3 K 2 H 3 [(GeTi 3 W 9 O 37 ) 2 O 3 ]·13H 2 O, induced Eu 3+ emissio…
Bombyx mori silk fibroin from the silkworm was found to be soluble in a calcium nitrate-methanol system. Fibroin dissolves in 75% w/v Ca(NO3)2/MeOH solution at a temperature of 67°C. The viscometric behavior of the fibroin-salt solution was analyzed and the fibroin's secondary structures were determined via 13C soluti…
Mesoporous silica films have been synthesized on borosilicate glass substrates under static conditions and continuous flow of the precursor surfactant−silicate mixture. Evidence for flow-induced orientation is provided. When films are grown under a flow field and for short deposition times, the tubular mesostructures…
Nanosized TiO2 was prepared using the sol–gel procedure. The prepared powder was thermally treated up to 1000°C. X-ray diffraction (XRD) measurements showed that the starting powder and the samples obtained after heating this powder up to 500°C were mixtures of anatase, as the dominant phase, and brookite. The crystal…
The protonation behavior of poly(propylene imine) dendrimers and some related oligo amines has been measured using natural abundance 15 N-NMR. The chemical shifts of the different shells of nitrogen nuclei as a function of pH have been directly interpreted as the degree of protonation for that shell. The thus obtained…
Thermal decomposition of ammonium dinitramide (ADN) has been studied by differential scanning calorimetry (DSC) and thermal gravimetry combined with mass spectrometry (TG−MS). ADN decomposes in the range 130−230 °C with an overall heat release of 240 ± 40 kJ mol -1 . The product gases have been identified by MS as NH…
A method to coat thin wires, 25 μm in diameter, with fluorocarbon material that is flexible and conformal has been achieved using pulsed plasma enhanced chemical vapor deposition (PECVD). This process enables the chemical composition of the films to be tailored in order to achieve similar stoichiometry and chemical co…
Polycationic high-spin states of 1,3-bis(diarylamino)benzene and 1,3,5-tris(diarylamino)benzene as prototypical model units for organic ferromagnetic metals have been studied by cw and pulsed ESR spectroscopy. An electron spin transient nutation (ESTN) method as a novel technique based on pulsed ESR spectroscopy has b…
In order to understand the effects of protein fouling during ultrafiltration of biological fluids, we have investigated the molecular interactions between a thin polysulfone film and hen egg lysozyme with the surface forces apparatus (SFA). The normalized forces between the adsorbed protein layers and polymer films we…
The synthesis of three triazamacrocycles containing the pyridine moiety and three acetate pendant arms (PCTA) is reported. The three systems differ due to the number of carbon atoms in the macrocyclic ring forming ligands PCTA-[12], -[13], and -[14], endowed with different coordination capabilities toward lanthanide(I…
Electron-beam deposition is used to fabricate free-standing carbon nanoelectrodes separated by a gap of less than 5 nm. Fabrication is carried out under direct visual control in an electron microscope. After coating the carbon electrodes with a thin metal film (e.g., AuPd) such structures can be used to study electric…