Materials Literature
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MD films are adopted as matrices for the assembly of Pbl2 nanoparticles into a layer structure; UV–VIS and X-ray diffraction results prove that the multilayers formed have a well-defined layer structure.
Treatment of cyanoethylated tetrathiafulvalene-thiolates or cyanoethylated 1,3-dithiole-2-thione-4,5-dithiolate with one equiv. of caesium hydroxide hydrate selectively and in high yield produces the corresponding monocaesium salts, which can subsequently be alkylated.
Six polymer-supported MoVI catalysts have been prepared. Two involve supported aminomethyl-2-pyridine (AMP) ligands, and the other four various ligands based on imidazole. All catalysts are active in the epoxidation of propene using tert-butyl hydroperoxide in the liquid state at 80 °C and at a pressure of 400 psi (He…
Protein-stabilized food dispersions often contain a range of surface active species. Many of these are of low molecular weight and include lipids or food emulsifiers. Depletion measurements, fluorescence and fluorescence recovery after photobleaching (FRAP) studies have shown that competitive adsorption of these molec…
Electromigration, that is, the forced motion of metal ions under the influence of an electric field, is potentially one of the most pernicious failure mechanisms in interconnects of large scale integrated microelectronic devices. The momentum exchange between the electrons and the ions causes the latter at normal oper…
A unified model of ionic motion in glasses is presented which relates consistently the different quantities observed in nuclear-spin relaxation and electrical-conductivity relaxation due to thermally activated ionic diffusion. Corresponding experimental data obtained in a low-ionic-conductivity fluorozirconate glass a…
We have previously shown that some ellagitannins are potent inhibitors of protein kinase C (PKC). On the basis of this finding, several series of hexahydroxybiphenyl derivatives of ellagic acid were synthesized as simple analogs of these ellagitannins and were evaluated for their inhibitory effect against PKC. Compoun…
The inverse temperature transition exhibited by elastin-like polypeptides has been shown to provide a basis for an intriguing array of energy transduction processes. For example, the elastin poly(pentapeptide) 1 can be fabricated into cross-linked gels that remain swollen in water at temperatures below 25 °C but then…
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…