Materials Literature
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A simple plasmon‐based electro‐optical device has been realized by over‐coating an array of Ag nanoparticles with WO 3 sol–gel layers. This treatment had the effect of stabilizing the Ag nanoparticle arrays to such an extent that they were capable of rapidly and reversibly modulating the transmittance of the electrode…
Reverse micelle-derived CdS:Mn/ZnS core/shell nanocrystals were synthesized with a core crystal diameter of 2.3 nm and a 0.4 nm thick ZnS shell and used as an electroluminescent material. Direct current (dc) electroluminescent (EL) devices were tested having a hybrid organic/inorganic multilayer structure of ITO//PEDO…
Four alkali cations (Li +, Na +, K +, and Rb + ) and ammonium (NH 4 + ), have been successfully used as templates for the synthesis of cryptomelane-type manganese oxide octahedral molecular sieves (A−OMS-2, A = the template cation). H−OMS-2 material has been prepared by the calcination of NH 4 −OMS-2. These A−OMS-2 ma…
The novel gadolinium(III) complex of formula [Gd(2)(mal)(3)(H(2)O)(6)] (1) (H(2)mal = 1,3-propanedioic acid) has been prepared and characterized by X-ray diffraction analysis. Crystal data for 1: monoclinic, space group I2/a, a = 11.1064(10) A, b = 12.2524(10) A, c =13.6098(2) A, beta = 92.925(10) degrees, U = 1849.5(…
This work describes the synthesis and structural features of functionalized amorphous silica with sulfonic acid groups. The approach followed involved the condensation of (3-mercaptopropyl)trimethoxysilane or (3-mercaptopropyl)methyldimethoxysilane and/or phenyltrimethoxysilane on the hydroxyl groups of the silica sub…
A microfluidic device is used to generate uniform emulsion droplets containing monodisperse latex spheres at specific intervals by shearing off the tip of the incoming aqueous phase at the junction of two microfluidic channels (see Figure). The water‐in‐oil emulsions are converted to uniform colloidal assemblies of la…
The optical absorbance spectrum for a suspension of quantum particles with an arbitrary particle size distribution is determined by the electronic transition and the distribution of bandgaps in the system. It is demonstrated that the particle size distribution obtained for a suspension of ZnO quantum particles is in e…
Deals with the main commercially significant and commonly used welding processes. This title takes the student or novice welder through the individual steps involved in each process in an easily understood way. It covers many of the requirements referred to in European Standards including EN719, EN 729, EN 729 and EN…
A positive muon spin rotation and relaxation ($μ^+$SR) experiment on [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$], ({\sl i.e.}, Ca$_3$Co$_4$O$_9$, a layered thermoelectric cobaltite) indicates the existence of two magnetic transitions at $\sim$ 100 K and 400 - 600 K; the former is a transition from a paramagnetic state to an inc…
Raman scattering on bulk AsxS1-x glasses showes that vibrational modes of As4S4 monomer first appear near x=0.38, and their concentration increases precipitously with increasing x, suggesting that the stoichiometric glass (x=0.40) is intrinsically phase seperated into small As-rich(As4S4) and large S-righ clusters. Su…
Abstract A method for the fabrication of thick films of porous anodic alumina on rigid substrates is described. The anodic alumina film was generated by the anodization of an aluminum film evaporated on the substrate. The morphology of the barrier layer between the porous film and the substrate was different from that…
External and reversible control of the size and surface energy of the pores in mesoporous architectures has been achieved. The method involves modification of mesoporous silica by atom transfer radical polymerization of N ‐isopropyl acrylamide (the precursor to a stimuli‐ responsive polymer). The resulting polymer‐gra…
At a generic quantum critical point, the thermal expansion $\ensuremath{\alpha}$ is more singular than the specific heat ${c}_{p}$. Consequently, the ``Gr\"uneisen ratio,'' $\ensuremath{\Gamma}=\ensuremath{\alpha}/{c}_{p}$, diverges. When scaling applies, $\ensuremath{\Gamma}\ensuremath{\sim}{T}^{\ensuremath{-}1/(\ens…
Mesoporous WO 3 films with a lamellar structure (see Figure) have been synthesized by electrodeposition using sodium dodecyl sulfate (SDS) as a templating agent. Compared to non‐porous WO 3 prepared with isopropanol instead of SDS, lamellar phase mesoporous WO 3 showed higher photocatalytic activity and greater curren…
Abstract Dielectric relaxation study of binary mixtures of poly(vinyl pyrrolidone) (PVP) ( M w = 40 000 g mol −1 ) and poly(ethylene glycol)s (PEGs) ( M n = 200, 400 and 600 g mol −1 ) with concentration variation was carried out in dilute solutions of benzene at 10.1 GHz and 35 °C. The average relaxation time τ o , c…
Abstract The copolymer P(AM‐ co ‐4VP) of acrylamide (AM) and 4‐vinylpyridine (4VP) was synthesized by radical copolymerization in solution, and then the copolymer was quaternarized using dimethyl sulfate to produce cationic P(AM‐ co ‐4VP) (CPAV), a cationic polyacrylamide containing quaternary pyridine salt. Two serie…
Abstract Uniform hollow silicalite-1 spheres with a high intact ratio and good mechanical stability were fabricated through a novel and effective approach, which involved the seed-induced hydrothermal crystallization of mesoporous silica microbeads in an alkaline aqueous solution.
Abstract Laser Raman spectroscopy, in conjunction with an optical high‐pressure cell, was used to investigate the poly(methyl methacrylate)‐carbon dioxide system. The Raman shifts associated with carbon dioxide molecules in the gas phase and those dissolved in the polymer were used to derive sorption kinetics of carbo…
Using high-resolution core-level photoemission measurements, we show that two different metastable species exist on a $\mathrm{Si}(111)\ensuremath{-}(7\ifmmode\times\else\texttimes\fi{}7)$ surface, instead of only one as suggested in the literature. One metastable species has a finite lifetime and is composed of both…
Abstract Epoxy/clay nanocomposites were prepared using a conventional diglycidyl ether of bisphenol A (DGEBA) epoxy, cured with diethyltoluene diamine (DETDA). The nanocomposites were characterized by dynamic mechanical analysis. A modest increase in glass transition temperature and significant increase in storage mod…