Materials Literature
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Electrodeposition of several unary and layered double hydroxides has been achieved by electrogeneration of base from the cathodic reduction of metal salt solutions such as nitrate or perchlorate. This simple one-step preparation can be adapted as a soft chemical route to the preparation of thin films of hydroxides.
Block copolymers in a selective solvent (a good solvent for one block but a nonsolvent for the other) form micellar structures through the association of the insoluble segments. Micelles formed through the association of amphiphilic block copolymers have several advantageous features as drug carrier systems due to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio and Density Functional Calculations on Ethylene GlycolTetsuro Oie, Igor A. Topol, and Stanley K. BurtCite this: J. Phys. Chem. 1994, 98, 4, 1121–1128Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 19…
Titanium substituted zeolite beta(Ti-Al-β) catalyses the epoxidation of oct-1-ene with TBHP; high selectivities to epoxide (92–100%) are observed when the Brønsted acid sites are neutralized by ion exchange with alkali or alkaline earth metal ions.
Despite its importance in cholesterol gallstone formation, crystallization of cholesterol from bile is poorly understood, especially with respect to the influences of other biliary lipids. We reported recently (Konikoff et al. J. Clin. Invest. 1992. 90: 1155-1160) that cholesterol can crystallize from model and native…
A novel concept of using semiconductor "heat pump" modules to heat and cool Nitinol shape memory alloy (SMA) wires under a zero-stress condition is analytically investigated in an effort to examine the feasibility of reducing the response time for complete thermal cycling. A heat transfer model is developed to provide…
A series of side-chain liquid crystal polymers, the poly[ω-(4′-methoxybiphenyl-4-yloxy)alkyl methacrylate]s, have been synthesized in which the spacer length is varied from 3 to 12 methylene units. This is the first example of a poly(methacrylate)-based side-chain liquid crystal polymer series for which as many as 10…
Ring‐opening polymerization (ROP) of cyclic monomers is most suitable for the preparation of sequential copolymers of the type (AAB) n , the sequence being determined by the structure of the monomer. The thermodynamics and mechanisms of ROP are reviewed, including radical, cationic, anionic, and metathetical ROP, with…
Abstract Hydrolytic degradation of intrinsically amorphous poly( DL ‐lactic acid) was re‐examined in pH 7.4 isoosmolar phosphate buffer at 37°C. Size‐exclusion chromatogarphy, X‐ray scattering and differential scanning calorimetry were used to monitor molecular weight and morphology changes up to the ultimate degradat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe use of NMR to study sodium dodecyl sulfate-gelatin interactionsDavid D. Miller, William Lenhart, Brian J. Antalek, Antony J. Williams, and J. Michael HewittCite this: Langmuir 1994, 10, 1, 68–71Publication Date (Print):January 1, 1994Publication History Published online1…
A review of papers on “seignettomagnetic” oxides is given. Data on crystal structure, physical properties and phase transitions of different groups of these oxides, especially of the perovskite type, have been described. Perspectives of synthesis and search for new seignettomagnetics of various crystal types, includin…
The effects of such constituents as the crosslinked part, non-crosslinked LDPE part, antioxidant, and residual byproducts on the formation of space charge in XLPE have been investigated. It has been found that homocharge is developed in the pure crosslinked part of XLPE. The non-crosslinked LDPE part encourages the fo…
The influence of postdeposition annealing on sputtered indium tin oxide (ITO) film characteristics were investigated. The annealing experiments were carried out in air or vacuum atmosphere. Both air and vacuum annealing decreased the resistivity up to heat treatment of 200° C. Over 300° C treatment, air annealing incr…
In 1959, about 1400 compounds forming liquid crystalline phases were known; by 1992, this number had increased to about 50 000. In portable devices like wristwatches, pocket caculators, measuring inst
The simplest mathematical model based on a new approach to the moving contact-line problem is examined, and is shown to adequately reflect the main features of wetting phenomena revealed by experiments. A simple algebraic equation describing the dependence of the dynamic contact angle on the contact-line speed and oth…
It is shown that the relevant spectral features which arise in the infrared spectrum of poly(3-methylthiophene) upon chemical doping or photoexcitation (i.e., in the electrically conducting form) can be properly explained by means of the effective conjugation coordinate (ECC) formalism. This theoretical dynamical mode…
A variety of monosulfonated phthalocyanine, benzonaphthoporphyrazine and porphyrin derivatives have been prepared as single positional isomers in moderate to high yield using modified Meerwein reaction conditions. These amphiphilic dyes have a potential application as photosensitizers in the photodynamic therapy of ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of DNA binding to electrically conducting polypyrrole filmsDaniel S. Minehan, Kenneth A. Marx, and Sukant K. TripathyCite this: Macromolecules 1994, 27, 3, 777–783Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue…
Discover what constitutes a composite material, how a composite is made, when a composite is best for a given application, how a composite material or structure responds to a thermal or mechanical load, and how to design a polymer composite that meets a set of property requirements. A general reference book for practi…
Existing matrix models for transformers reproduce specified short-circuit tests, portraying leakage flux in air, but do not explicitly model the core. Therefore, a precise relation between core flux and air flux is not clearly established. Core representation is defined simply on the basis of a specified excitation cu…