Materials Literature
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Abstract Even though mixtures of polyelectrolytes and surfactants are used in a variety of technologies, little is known about the solid state properties of complexes formed by the two components. Recently reported methods for preparing polyelectrolytesurfactant complexes and their solid‐state structure will be descri…
This body of work represents the first volume of a book series covering the field of tissue engineering. Tissue engineering, which refers to a category of therapeutic or diagnostic products and proces
A chiral (salen)Mn III complex [salen: trans-(R,R)-1,2-bis(salicylideneamino)cyclohexane] analogous to Jacobsen’s catalyst is prepared inside the supercages of zeolite Y, showing catalytic activity very similar to that of the chloride complex in the homogeneous phase.
We present a new use of dynamic light scattering that permits the determination of the viscoelastic behavior of a complex fluid. By describing the motion of a scattering particle in a viscoelastic medium in terms of a generalized Langevin equation with a memory function, we relate the time evolution of its mean-square…
A range of increasingly important chemical syntheses for ceramic materials are described. These syntheses are coprecipitation, molten salts, sol–gel processes, hydrothermal techniques, liquid-phase and gas-phase reactions, polymer pyrolysis, the Pechini and citrate gel methods, aerosols and emulsions. Common themes re…
Over the past decade, a substantial number of sandwich-type metal complexes with mixed phthalocyaninato and/or porphyrinato ligands have been synthesised. Owing to the intriguing π–π interactions associated with these complexes, this family of sandwich compounds displays unique physical, spectroscopic and electrochemi…
High‐quality, hexagonal phase, mesoporous silica fibers (see Figure) can be grown by the general procedure for one‐step, two‐phase, room temperature synthesis reported here. The silica fibers, which are 1–5 μm in diameter and up to 5 cm long, have excellent long‐range order, a narrow pore size distribution, and a pore…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationSelf-Assembly and Disassembly of Regioregular, Water Soluble Polythiophenes: Chemoselective Ionchromatic Sensing in WaterRichard D. McCullough, Paul C. Ewbank, and Robert S. LoeweView Author Information Department of Chemistry, Carnegie Mellon University Pittsburgh, Pennsy…
The subject of this review is the synthesis and electropolymerisation of pyrroles or thiophenes with pendant functional groups (metal complexes, ligands, biomolecules for protein binding etc.) to afford electrodes coated with a polymeric matrix containing the desired functionality. Such electrodes are being examined i…
This article deals with the calculation of the shielding tensor of nuclear magnetic resonance (NMR) spectroscopy based on a scalar relativistic two-component Pauli-type Hamiltonian. A complete formulation of the method within the framework of the gauge including atomic orbitals (GIAO) is given. Further, an implementat…
ABSTRACT Concentrations of sodium hydroxide, sulfuric and citric acids used in processing gelatin from cod skins affected both yield and quality. The highest yield of gelatin was obtained when low concentrations [0.1–0.2% (w/v)] of sulfuric acid and sodium hydroxide were applied to the skins followed by treatment with…
A non‐destructive method for purifying carbon nanotubes produced by are discharge is described. The nanotubes, in the form of a kinetically stable colloidal dispersion in a water–surfactant solution, are separated from the nanoparticles by filtration. The Figure shows that purified nanotubes after two filtration steps…
Atomistic simulation has been used to calculate the surface structures and stability of the rutile and anatase polymorphs of TiO 2 . The surface and attachment energies were used to evaluate the equilibrium and pseudo-kinetic morphologies. The surfaces expressed in rutile were {011}, {110}, {100} and {221} with surfac…
Low hydrothermal stability in hot water and aqueous solutions was a critical problem for many applications of the mesoporous molecular sieve MCM-41, compared with conventional zeolites such as Y and ZSM-5. The hydrothermal stability of MCM-41 has been found to improve remarkably by using various salts such as sodium c…
Preface Symbols and Definitions Introduction Thermodynamics of Point Defects One- and Two-dimensional Defects in Crystals Basic Kinetic Concepts and Situations Kinetics and Dynamics. Local Equilibrium Heterogeneous Solid State Reactions Oxidation of Metals Solids in Thermodynamic Potential Gradients Internal Reactions…
▪ Abstract As a molten alloy or any multi-component liquid is cooled and solidified the growing solid phase usually forms a porous matrix through which the residual liquid can flow. The reactive two-phase medium comprising the solid matrix and residual liquid is called a mushy layer. Buoyancy forces, owing primarily t…
Abstract An investigation has been performed of the cell nucleation and initial growth behaviors in the foam processing of polypropylene (PP) in both the linear and branched forms. These materials were foamed in extrusion with the two blowing agents, CO 2 and isopentane. The cell density generally increased with an in…
Layer-by-layer deposition of polyelectrolytes onto poly(ethylene terephthalate) (PET) film is reported as a method for polymer surface modification. Poly(allylamine hydrochloride) (PAH) and poly(sodium styrenesulfonate) (PSS) were sequentially adsorbed to unmodified (neutral) PET as well as PET samples that had been s…
A Brief Introduction to Composite Materials and Manufacturing Processes (T. Gutowski). The Processing Science of Reactive Polymer Composites (J. Kardos). The Processing Science of Thermoplastic Composites (J. Muzzy & J. Colton). The Elastic Deformation of Fiber Bundles (T. Gutowski & G. Dillon). Processing of Textile…
Single crystal adsorption calorimetry was applied to investigate the heats of adsorption of CO and oxygen and the reaction heats for the CO oxidation process on Pt{111} at room temperature. Both sticking probabilities and heats of adsorption for CO and oxygen are presented as a function of coverage. These results are…