Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of two-dimensional nanostructures by direct intercalation of polymer melts in layered silicatesRichard A. Vaia, Hope Ishii, and Emmanuel P. GiannelisCite this: Chem. Mater. 1993, 5, 12, 1694–1696Publication Date (Print):December 1, 1993Publication Hi…
Exchange hardening of nanostructured two-phase systems composed of an aligned hard phase and a soft phase with high magnetization is investigated using an approach which yields analytic nucleation fields from the micromagnetic vector equation, and accounts for interactions between the soft regions. In suitable structu…
An algorithm has been developed for the automatic interpretation of a given set of observed reciprocal-lattice points. It extracts a reduced cell and assigns indices to each reflection by a graph-theoretical implementation of the local indexing method. All possible symmetries of the observed lattice compatible with th…
Polymers have played indispensable roles in the preparation of pharmaceutical products. Their applications range widely from material packaging to fabrication of the most sophisticated drug delivery devices. This chapter reviews various polymers used in pharmaceutics based on their applications.
The literature data on the methods of synthesis and the properties of naphthacenequinones and related compounds are surveyed. The tautomeric and photochromic transformations of naphthacenequinone derivatives are examined. The bibliography includes 158 references.
Abstract An algorithm which combines the techniques of numerical analysis and numerical simulation in the study of transient dynamic structural response is proposed. This is achieved by incorporating the ability to create new surfaces and separate fragments according to a defined failure criterion into a finite elemen…
Intercalation by atoms (Cs, K, Ba, Pt, Si, C,...) of a monolayer graphite film deposited on a metal (Ir, Re,...) is reviewed. Atoms with low ionization potential (Cs, K, Ba,...) form a monolayer film of the intercalate under the graphite layer, whereas atoms with high unionization potential (Pt, Si, C,...) form a thic…
Collagens are known to have wide biomedical applications. They are for hemostatic agent, blood vessel, heart valve, tendon and ligament, burn dressing, intradermal augmentation, drug delivery systems and so on ( 1 ). The denatured type collagen, gelatin, has also been used in medicine as plasma expander, wound dressin…
Polymers have played indispensable roles in the preparation of pharmaceutical products. Their applications range widely from material packaging to fabrication of the most sophisticated drug delivery devices. This chapter reviews various polymers used in pharmaceutics based on their applications.
A new nonthermoluminescent dosimetric technique was developed by using the afterglow response characteristic of alkali halide single crystals doped with europium ions. The afterglow luminescence decayed very slowly and its intensity was proportional to the radiation dose. The radiation dose was measured by the time in…
An apparent activation energy for CO desorption from (100) diamond surfaces exposed to atomic oxygen was determined by thermal desorption spectroscopy performed in ultrahigh vacuum and found to be equal to 45.0 kcal/mol. A minimum potential-energy reaction path was identified by semiempirical quantum chemical calculat…
The effect of hydrogen and oxygen surface termination atoms on the visible luminescence of porous Si was investigated for underlying physical mechanism. Atmospheric thermal treatment up to 1000 °C was carried out to study the functional relationship between the surface coverage and photoluminescence (PL). The results…
Previously, the E. coli cysG gene product had been shown to sequentially methylate uro'gen III to produce precorrin-2, hence it was given the trivial name uro'gen III methylase. We now report that in addition to methylase activity, the CysG protein catalyses both the NAD+ dependent oxidation of precorrin-2 to sirohydr…
We have studied the growth of the wetting layer formed at the surface of a critical mixture of poly(ethylene propylene) and perdeuterated poly(ethylene propylene) during spinodal decomposition. The wavelength of the surface spinodal wave is found to grow as ${\mathit{t}}^{1/3}$ over the entire range of times accessibl…
In this letter we present time resolved measurements of the 3.10 eV (400 nm) photoluminescence in germainum-doped silica. The 3.10 eV band arises from a triplet to singlet transition in a GeO defect. We find that the photoluminescence decays with a time constant of around 100 μs. There is a delay roughly 10 μs in dura…
The whole needle-crystal solution for three-dimensional (3D) dendritic growth is described analytically. Its construction involves the existing 3D selection theory for the tip of the dendrite (M. Ben Amar and E. A. Brener [Phys. Rev. Lett. 71, 589 (1993]) plus matching of the tail to this tip. This is exhibited here.…
We present measurements on a novel power detector which can be used as an ultrasensitive detector of millimeter and submillimeter radiation. The absorbing element consists of a thin film resistor strip which is connected to superconducting electrodes. This device exploits the Andreev reflection of electrons and the we…
The C 1s exciton in diamond is studied by soft x-ray emission excited with high resolution monochromatic photons. A strong phonon sideband of 5 eV wide is observed in the exciton recombination spectrum. With the phonon contribution, the exciton binding energy is estimated to be 1.5 eV. The excited atoms is suggested t…
Hyper-Rayleigh scattering has been used to determine the nonlinear optical properties of a chromophore-containing protein in solution. Because the technique of hyper-Rayleigh scattering allows the measurement of hyperpolarizabilities in an isotropic solution without the application of an electric field, this method is…
A thin optical half-waveplate at 1.55μm, only 14.5μm thick, which is 6.3 times as thin as a zeroth order quartz waveplate, is prepared using fluorinated polyimide. This material has good flexibility, thickness controllability, and high thermal stability. The retardation of the waveplate was retained after annealing at…