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。
Novel lamellar mesophases which are quite distinct from conventional smectic mesophases were obtained with a bolaamphiphilic triblock molecule composed of a rigid biphenyl core, two polar 2,3-dihydroxypropoxy groups in the terminal 4- and 4'-positions, and a semiperfluorinated chain [O(CH2)6C10F21] in the lateral 3-po…
Isolated vertically aligned carbon nanofibers (VACNFs) have been grown using dc plasma-enhanced chemical vapor deposition, and the effects of the growth conditions on VACNF morphology and composition have been determined in substantial detail. The dependence of the growth rate, tip and base diameters, and chemical com…
The structural changes occurring during heating in a syndiotactic polystyrene (sPS)−solvent complex were monitored in situ by X-ray diffraction. The room temperature δ form transformed into the γ form on heating above the glass transition temperature of the sPS. The transition temperature showed a linear dependency on…
Strong intermolecular hydrogen bonding is capable of suppressing concentration fluctuations and coupling segmental relaxations in polymer blends whose components exhibit a large difference in their respective T g 's (Δ T g ). In this paper we report on our dielectric study of blends of poly(4-vinylphenol) [PVPh] with…
Uniform spherical aggregates of palladium nanoparticles with a mean diameter of 70 nm were produced by stirring of palladium(II) acetate with octa(3-aminopropyl)octasilsesquioxane octahydrochloride ( 1 ) as a cubic-linker in methanol at room temperature via self-organized spherical templates of palladium ions and 1 .…
A general method was developed to prepare siloxane surfactant C 16 H 33 −N + (Me) 2 −CH 2 CH 2 CH 2 −Si(OMe) 3 Cl - micelles doped with highly luminescent lipophilic semiconductor CdSe quantum dots (QDs). Encapsulated green emission CdSe QDs with an emission maximum at 525 nm and red emission QDs with an emission maxi…
Silicalite-1 macrostructures in the form of hollow silicalite-1 spheres and bodies with a regular system of macrocavities were prepared using two types of polystyrene beads as shape-directing macrotemplates. The incompatibility between the organic support and the inorganic shell was circumscribed by using negatively c…
Hybrid composites of CdS nanoparticles embedded in sulfonated polystyrene (PS) matrixes have been prepared and characterized. The −SO 3 - groups acted as the coordination sites for cadmium ion aggregations and nanosized CdS particles were successfully grown in situ at these sites with the release of S 2 - ions from th…
Theoretical investigations on electrorheological (ER) fluids usually rely on computer simulations. An initial approach for these studies would be the point-dipole (PD) approximation, which is known to err considerably when the particles approach and finally touch due to many-body and multipolar interactions. Thus vari…
We report on the formation of nanostructured, ultrathin films of a new class of fluorescent nanoparticles (NPs) within the same size range as quantum dots, but with a different kind of fluorescence, by using the layer-by-layer (LbL) technique. The fluorescence of these rare-earth-doped lanthanum phosphate (LaPO 4 ) NP…
Synthesis of nanoparticles under restricted environments offered by water-in-oil microemulsions provides excellent control over particle size and shape and interparticle spacing. These environments have been used in the synthesis of silica nanoparticles with a ZnFe 2 O 4 magnetic core. First, aqueous magnetic fluids c…
Rubber compounds based on natural rubber containing organically modified montmorillonites were prepared. The state of dispersion of the clay was characterized by scanning and transmission electron microscopies, and the spacings between the silicate layers were evaluated by X-ray diffraction. The effect of the addition…
A new form of silver nanostructured materials, silver nanodisks, are generated by a solution-phase approach. In this method, truncated triangular silver nanoplates are at first fabricated through seed-mediated growth of silver particles in the presence of concentrated cetyltrimethylammonium bromide (CTAB). Subsequent…
One-dimensional nanostructures of orthorhombic molybdenum trioxide (α-MoO 3 ) have been synthesized in the forms of ribbons or rods via acidification under hydrothermal conditions at 140−200 °C. The reaction path has been revealed with our kinetic investigations, which shows the following sequence: (i) from the starti…
The biosynthesis of Q-state CdS nanoparticles by reaction of aqueous CdSO4 solution with the fungus, Fusarium oxysporum, is demonstrated. Nanoparticle formation proceeds by release of sulfate reductase enzymes by the fungus, conversion of sulfate ions to sulfide ions that subsequently react with aqueous Cd2+ ions to y…
Reaction of the electron acceptor 2,5,7-trinitro-4-bromo-9-dicyanomethylenefluorene (1) and the electron donor 2,6-dihexyloxy-9,10-bis(4,5-dimethyl-1,3-dithiol-2-ylidene)-9,10-dihydroanthracene (2) in dioxane resulted in the formation of a novel type of salt with the previously unknown 2,5,7-trinitro-4-bro…
Abstract Polylactide (PLA) and a block copolymer, poly‐ DL ‐lactide–poly(ethylene glycol) (PELA) were synthesized by bulk ring‐opening polymerization initiated by stannous chloride. A linear DNA molecule, λDNA, was used as the model DNA. PLA, PELA, λDNA‐loaded PLA and PELA microspheres were prepared by the solvent‐ext…
Abstract Two fully fluorinated polymers, poly(tetrafluoroethylene) (PTFE) membranes and poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) (FEP) films, were modified by graft copolymerization with monoacryloxyethyl phosphate (MAEP) in an aqueous solution at ambient temperature using gamma irradiation. The modified mem…
A geometrical model is proposed for the recently observed transformation under the action of highly localized stresses during the surface scratch test of the icosahedral phase into a body-centred cubic (BCC) phase, the disordered version of the B2 phase with the CsCl structure, which occupies a large portion of the Al…
Scaled particle theory is used to calculate the equation of state for and the free volume accessible to a non-adsorbing polymer, represented by spheres, in a system of colloidal platelets, represented by cut spheres. At low densities the predictions agree very well with computer simulations. For infinitely thin discs,…