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。
We present measurements of fluorescence intensity trajectories and associated excited-state decay times from individual CdSe/oligo(phenylene vinylene) (CdSe-OPV) quantum dot nanostructures using time-tagged, time-resolved (TTTR) photon counting techniques. We find that fluorescence decay times for the quantum dot emit…
Earlier stages of aniline polymerization have been studied by Fourier transform electrochemical impedance spectroscopy (FTEIS) experiments. Initial oxidation of aniline leads to the formation of a thin layer passivating the electrode surface, which is depassivated upon a further increase in potential and mediates a fu…
The complex between Eu(III) and 1,7-diaza-4,10,13-trioxacyclopentadecane-N,N'-diacetic acid (L4) was characterized by pH potentiometric titration and 1H NMR spectroscopy. The conversion of the monomer to a dimeric complex is observed as the pH is increased from 7 to 10 in a reaction that releases one mol/HO- per dimer…
Abstract Vapor deposition method was used to obtain nanocrystals of N ‐(3,5‐di‐ tert ‐butylsalicylidene)‐4‐ aminopyridine ( 1 ) and N ‐(3,5‐di‐ tert ‐butylsalicylidene)‐4‐iodoaniline ( 2 ), and nanoscale thin layers (65 nm thick) of cis ‐1,2‐dicyano‐1,2‐bis(2,4,5‐trimethyl‐3‐thienyl)ethene ( 3 ). Compound 3 was also d…
Dielectric measurements were carried out for mixtures of Triton X-100 (TX, a nonionic detergent with a poly(ethylene oxide) chain) and water with or without electrolytes over a frequency range of 1 MHz to 10 GHz to study the structure and dynamics of water molecules in the mixtures. Dielectric relaxation was found abo…
Carbon nanocoils and nanofibers with novel morphologies and potential new properties were prepared from controlled delivery of acetylene. Branched carbon nanocoils were produced from continuous acetylene flow. Pulsed delivery of acetylene produced branched carbon nanofibers with even-length subunits. Interrupted acety…
Scanning electron microscopy combined with energy-dispersive X-ray spectrometry is particularly suited to characterizing morphology and elemental composition of individual microparticles. Although not straightforward, quantitative X-ray microanalysis of low-Z-containing particles is achievable using atmospheric thin-w…
An environmentally benign transparent photochromic film, 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3'-[3H]-naphtho[2,1-b][1,4]oxazine] (SPO) /gamma-cyclodextrin (gamma-CD), was prepared using the cast-coating method, and the nanocavity effect of gamma-CD on the photochromism of SPO was studied. The film mainly cons…
We demonstrate how a generalized self-consistent field theory for polymer melts that includes elastic stress and strain fields can be applied to the study of AB diblock copolymers melts. By obtaining the stress distributions for volume conserving strain loadings where lamellar and hexagonal morphologies are stable, we…
Mathematical models were built to predict sodium phosphate inhibition of copper corrosion in aqueous chloride and sulphate media. SEM-EDXS and AFM were used to characterize material surfaces without and with inorganic salt addition. Inhibitor efficiency was compared with that exhibited by benzotriazole.
Ortho -, meta -, and para -nitroaniline isomers (ONA, MNA, and PNA, respectively) were investigated with surface-enhanced infrared absorption (SEIRA) and surface-enhanced Raman spectroscopy (SERS) via adsorption of the individual isomers on vacuum-deposited silver films and on silver powders of varying physical dimens…
A series of three novel 2,3,9,10,16,17,24,25-octakis(octyloxycarbonyl)phthalocyanine compounds M[Pc(COOC8H17)8] (M = 2H, Cu, Zn) (1-3) have been synthesized via the cyclic tetramerization of 4,5-di(octyloxycarbonyl)phthalonitrile, which was obtained by a newly developed procedure with o-xylene as starting material, pr…
This paper reports on the preparation of a new multifunctional nanocomposite that consists of superparamagnetic core and rhodamine B (Rh B) doped silica shell. The final products were characterized by x-ray powder diffraction (XRD), transmission electron microscopy (TEM), vibration sample magnetometer (VSM), photolumi…
Purpose: Low crystallinity celluloses (LCC) are materials that have a substantially reduced degree of crystallinity, typically ranging between 15 and 45%. It is useful as an excipient in preparation of tablets and confectionery products. The aim of this work was to obtain from α-cellulose content of corn cob, a l…
The diffusion mechanism of indium atoms along multiwalled carbon nanotubes is studied by means of photoemission spectromicroscopy and density functional theory calculations. The unusually high activation temperature for diffusion (approximately 700 K), the complex C 1s and In 3d5/2 spectra, and the calculated adsorpti…
Abstract We describe a class of metamaterial particle that employs active elements to overcome the inherent limitations of their passive counterparts, such as significant losses, high dispersion, and narrow bandwidth. The active unit cell can be designed to have either an electric or magnetic response. For a magnetic…
A method for the synthesis of functional hybrid nanoparticles of uniform size is reported. 1,1'-bis[3-(trimethoxysilyl)propyl]-4,4'-bipyridinium iodide and N,N'-bis[(3-trimethoxysilyl)propyl]ethylenediamine bridged polysilsesquioxane spherical, monodisperse nanoparticles are prepared utilizing inverse water-in-oil pol…
We present a novel one-step assembly process that encompasses in-situ formation of silver nanoparticles (NP), directed assembly of block copolymers into a perpendicular lamellar morphology, and NP organization into patterned arrays. This process utilizes organometallic precursors that thermally decompose and form spat…
The interfacial thickness and mechanical strength of several model interfaces between immiscible polymer melts were investigated. The interfacial width at equilibrium was determined by neutron reflectivity, and the adhesion energy was determined with an asymmetric probe test method inspired of the tests used for soft…
Abstract A series of alternating polyamide–imides (PAIs) with fluorenyl cardo having inherent viscosities of 0.38–0.88 dL/g was synthesized by one‐pot polycondensation of cardo diamines, trimellitic anhydride, and various aromatic diamines including p ‐phenylene diamine, m ‐phenylene diamine, 4,4'‐oxydianiline, 3,4'‐o…