Materials Literature
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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.
A technique is described for fabricating arrays of uniform CdS nanowires with lengths up to 1 μm and diameters as small as 9 nm by electrochemically depositing the semiconductor directly into the pores of anodic aluminum oxide films from an electrolyte containing Cd 2+ and S in dimethyl sulfoxide. The nanowire arrays…
This volume presents recent advances in selcted topics on the chemistry, structure, and bonding of Zintl phases and Zintl ions. Areas covered include: the use of Zintl phases as precursors to novel solid state compounds; and electrochemical synthesis of novel Zintl phases; Zintl phases at the metal-insulator border; r…
An integral isoconversional method provides a linear procedure to estimate the activation energy ( E α ) at a given conversion (α) but only when an oversimplified approximation of the temperature integral ( p ( x ), where x = E / RT, R is the gas constant and T is the temperature) is used. Although the relative error…
Starting from the naturally occurring structure of porous aluminum oxide, a polymer mold suitable for the formation of titanium dioxide nanotubes was obtained. The tubular structure was formed by electrochemical deposition in the mold. After dissolution of the polymer, titanium dioxide nanotubes were obtained and char…
Crystalline mesoporous molecular sieves may be prepared under a wide range of conditions in the presence of cationic, anionic, gemini, or neutral surfactants. These mesostructured materials include pure and modified silicates, other metallic oxides and sulfides as well as aluminophosphates. Air calcination of silicate…
This review discusses two classes of organic template-derived amorphous silicas distinguished by the nature of template-matrix interactions and the extent to which subsequent processing dictates the final pore morphology. First we discuss surfactant-templated silicas where the template-matrix interaction is via non-co…
The formation of ordered phases of acid-hydrolyzed cellulose suspensions was studied as a function of cellulose crystallite concentration and added electrolyte (HCl, NaCl, and KCl) concentrations. A chiral nematic phase formed when the suspension concentration was higher than 5.14 × 10 -6 nm -3 in water. For biphasic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbide and Nitride Overlayers on Early Transition Metal Surfaces: Preparation, Characterization, and ReactivitiesJingguang G. ChenView Author Information Corporate Research Laboratories, Exxon Research and Engineering Company, Annandale, New Jersey 08801 Cite this: Chem. Re…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCalix[4]pyrroles: Old Yet New Anion-Binding AgentsPhilip A. Gale, Jonathan L. Sessler, Vladimír Král, and Vincent LynchView Author Information Department of Chemistry and Biochemistry University of Texas at Austin, Austin, Texas 78712-1167 Cite this: J. Am. Chem. Soc.…
Carbon dioxide reforming of methane produces synthesis gas with a low hydrogen to carbon monoxide ratio, which is desirable for many industrial synthesis processes. This reaction also has very important environmental implications since both methane and carbon dioxide contribute to the greenhouse effect. Converting the…
Super water-repellent surfaces showing a contact angle of 174° for water droplets have been made of alkylketene dimer (AKD). Water droplets roll around without attachment on the super water-repellent surfaces when tilted slightly. The AKD is a kind of wax and forms spontaneously a fractal structure in its surfaces by…
A layered protonic titanate of lepidocrocite-type, H x Ti 2- x /4 □ x /4 O 4 ·H 2 O ( x ∼ 0.7; □, vacancy), has been exfoliated on the action of an aqueous solution of tetrabutylammonium (hereafter TBA) hydroxide, which resulted in a stable colloidal suspension. A colloidal aggregate centrifuged from the suspension wa…
The static and dynamic properties of polymer-layered silicate nanocomposites are discussed in the context of polymers in confined media. Despite the topological constraints imposed by the host lattice, mass transport of the polymer into the silicate layers (at least in the case of essentially non-polar polystyrene) ap…
The science describing semiconductor−liquid interfaces is highly interdisciplinary, broad in scope, interesting, and of importance to various emerging technologies. We present a review of the basic physicochemical principles of semiconductor−liquid interfaces, including their historical development, and describe the m…
We report on the synthesis and characterization of 25−70 Å diameter amine-capped gold nanocrystals. In particular, we show how these particles can be prepared by a simple procedure and confirm the particle composition (including the identity of the amine surface passivant) through several materials characterization te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConjugated Macromolecules of Precise Length and Constitution. Organic Synthesis for the Construction of NanoarchitecturesJames M. TourView Author Information Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208 Cite this: Che…
A highly ordered gold nanodot array was fabricated by vacuum evaporation using an anodic porous alumina membrane with through-holes of nanometer scale as a mask. This technique resulted in an orderly arrangement of Au dots with a diameter of approximately 40 nm over a large area on a Si substrate.
Organic-inorganic hybrids appear as a creative alternative for obtaining new materials with unusual features. This is related to their diphasic structures, leading to multifunctional materials. The low-temperature processes which are used to synthesize such structures provide a wide versatility in the design of the co…
Organic/inorganic hybrid materials prepared by the sol−gel approach have rapidly become a fascinating new field of research in materials science. The explosion of activity in this area in the past decade has made tremendous progress in both the fundamental understanding of the sol−gel process and the development and a…