Materials Literature
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Basic problems of kinetic processing of nonisothermal data ascertained from thermal analysis measurements can be solved by isoconversional methods. Analysis of the dependence of the activation energy on conversion often permits the identification of the kinetic scheme for the process. This dependence may also be used…
Isostructural ZrW 2 O 8 and HfW 2 O 8 show strong negative thermal expansion from 0.3 K up to their decomposition temperatures of approximately 1050 K. This behavior is especially unusual because these compounds are apparently cubic over their entire existence range. Detailed structural studies of ZrW 2 O 8 were condu…
Nano‐sized NiO/Ni composite films have been found to perform as superior electrodes in electrochemical capacitor applications. These films can provide a specific capacitance of 50 to 64 F/g. The specific energy and specific power of these films were 25 to 40 kJ/kg and 4 to 17 kW/kg, respectively. These specific quanti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorOrigins of Complex Self-Assembly in Block CopolymersM. W. Matsen and F. S. BatesView Author Information Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455Cite this: Macromolec…
Silver nanoparticles have been prepared by photoreduction of silver nitrate with 254 nm UV light in the presence of poly( N -vinylpyrrolidone). The effects of PVP concentration on the particle size, the UV−vis absorption peak, and the rate of the photoreduction process were studied. The average particle size ranged fr…
The discovery of mesoporous molecular sieves, MCM-41, which possesses a regular hexagonal array of uniform pore openings, aroused a worldwide resurgence in this field. This is not only because it has brought about a series of novel mesoporous materials with various compositions which may find applications in catalysis…
The “wet” colloid chemical construction of nanosized or nanostructured materials (i.e., those in the 1−100 nm range) has been inspired by biomineralization (the in vivo formation of inorganic crystals and/or amorphous particles in biological systems) and hierarchically organized self-assembly (spontaneous stepwise ass…
PAMAM Starburst dendrimers are spherical macromolecules composed of repeating polyamidoamino units. They can be produced in successive "generations," each with a defined size, molecular weight, and number of terminal amino groups. Because of these well-defined characteristics, PAMAMs are finding utility in a variety o…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSonochemical Synthesis of Iron ColloidsKenneth S. Suslick, Mingming Fang, and Taeghwan HyeonView Author Information School of Chemical Sciences University of Illinois at Urbana−Champaign 505 South Mathews Avenue, Urbana, Illinois 61801 Cite this: J. Am. Chem. Soc. 1996…
Off-lattice Monte Carlo simulations on semiflexible polymer chains with and without excluded volume interactions have been performed. The model used in the simulations is a discrete representation of the worm-like chain model of Kratky and Porod applied in the pseudocontinuous limit. The ratio between the cross-sectio…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleHetero- and Metallasiloxanes Derived from Silanediols, Disilanols, Silanetriols, and TrisilanolsRamaswamy Murugavel, Andreas Voigt, Mrinalini Ganapati Walawalkar, and Herbert W. RoeskyView Author Information Institut für Anorganische Chemie der Universität Göttingen, Tammannstra…
We describe an emulsion-based technique that allows the assembly of colloid particles into microstructured or multicomponent clusters (“supraparticles”). The particles are gathered, assembled, and fixed together in the restricted, colloid-size 2D or 3D space provided by emulsion droplets. The process is carried out by…
Nanocrystals of MgO and CaO have been prepared by a modified aerogel/hypercritical drying/dehydration method. For nanocrystalline MgO (AP-MgO) surface areas ranged from 250 to 500 m 2 /g, whereas for AP-CaO 100−160 m 2 /g. These materials have been compared with more conventional (CP) microcrystalline samples of lower…
The general design criteria and synthesis of four new peptide-based solid-state tubular array structures are described. Peptide nanotubes, which are extended tubular β-sheet-like structures, are constructed by the self-assembly of flat, ring-shaped peptide subunits made up of alternating d - and l -amino acid residues…
General principles guiding selection and use of particulate materials principle types of particulate fillers analytical techniques for characterizing filler surfaces surface modifications and surface modifiers preparation and mixture characterization of particulate filled polymer compounds effect on particulate filler…
A series of mesoporous MCM-41 and HMS silica molecular sieves have been prepared by electrostatic and neutral assembly pathways, respectively, and their properties have been compared by a variety of physical techniques. Direct S + I - charge matching between cationic quaternary ammonium ion surfactants (S + ) and the…
The synthesis and photophysical characterization of nanometer-size ZnS with and without Mn 2+ are reported. Without Mn 2+, the ZnS nanoclusters emit in the blue upon ultraviolet excitation. ZnS doped with 1−5% Mn 2+ (presumably in Zn 2+ sites) yields the orange emission observed for bulk Zn:Mn phosphors but with great…
We present the results of new and previously published 17 O NMR, EPR, and NMRD studies of aqueous solutions of the Gd 3+ octaaqua ion and the commercial MRI contrast agents [Gd(DTPA)(H 2 O)] 2 - (MAGNEVIST, Schering AG, DTPA = 1,1,4,7,7-pentakis(carboxymethyl)-1,4,7-triazaheptane), [Gd(DTPA-BMA)(H 2 O)] (OMNISCAN, San…
Organically functionalized mesoporous silicas are prepared at room temperature by the co-condensation of tetraethoxysilane and organosiloxanes in the presence of surfactant templates; the resulting materials are the first examples of covalently linked, ordered, hybrid inorganic–organic networks.