Materials Literature
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Observations of the photoredox reactivity of antimony(III) porphyrin complexes are reported. Upon irradiation with visible light under ambient conditions, a photooxidation to the corresponding dihydroxoantimony(V) porphyrins occurs. At the same time a two-electron or four-electron reduction of molecular oxygen takes p…
This paper discusses the characteristics of noise sources in Al-based thin films and their relationships to VLSI reliability. Techniques of applying noise measurements in detecting existing defects/damages in the films, determining electromigration activation energy, and predicting the time to failure of VLSI intercon…
The bond-fluctuation model of polymer chains has been used to study layers of end-grafted polymers anchoring at repulsive walls for a broad range of chain length, grafting densities and solvent quality. The dynamics of monomers and associated relaxation times are investigated and interpreted by phenomenological theori…
The motion of a single bubble is simulated directly using the full conservation equations for mass, momentum and energy when the surrounding pressure increases stepwise. The numerical results for several cases reveal that considerable distributions of temperature and concentration of vapor are formed inside the bubble…
The results of the characterization of plasma-treated polypropylene (PP) and polymethylmethacrylate (PMMA) by X-ray photoelectron spectroscopic, atomic force microscopic (AFM), and surface resistivity measurements are presented. Chemical, physical, and morphological modifications of the polymer surface were investigat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSol-gel synthesis of a siloxypolycarbosilane gel and its pyrolytic conversion to silicon oxycarbideFlorence Babonneau, Laurence Bois, Chia Yu Yang, and Leonard V. InterranteCite this: Chem. Mater. 1994, 6, 1, 51–57Publication Date (Print):January 1, 1994Publication History P…
ZrO2 coatings deposited on 316 L stainless steel sheets were synthesized by sol-gel method using Zr(OC3H7)4 as precursor and isopropanol, glacial acetic acid, and water as solvents for application with ultrasounds. Different solutions for dip-coating were prepared with compositions varying between 0.025 and 0.9 mol/dm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline aromatic polyesters containing isophthalic acidRubing Cai and Edward T. SamulskiCite this: Macromolecules 1994, 27, 1, 135–140Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs…
12 meltable substances were studied with respect to their ability to form prolonged release pellets in a melt pelletization process using a laboratory scale high shear mixer. It was found that few substances were able to pelletize a formulation with 12.5% m/m paracetamol and 87.5% m/m calcium hydrogen phosphate. Favou…
Surface modifications produced by treatments (mainly halogenation) of synthetic vulcanized styrene-butadiene rubber (SBR) leading to increased adhesion properties with polyurethane adhesives have been studied. T-peel tests, scanning electron microscopy (SEM), advancing contact angle measurements, infra-red (IR) spectr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of Excimer Emission and Photochemistry of Stilbene Units by Oligonucleotide HybridizationRobert L. Letsinger and Taifeng WuCite this: J. Am. Chem. Soc. 1994, 116, 2, 811–812Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Publishe…
A simple sol–gel route starting from an aqueous mixture of Y, Ba and Cu acetates and tartrates has been refined to prepare superconducting YBa2Cu4O8 at an oxygen pressure of 1 atm. Thermal decomposition of the fabricated gels was studied by means of thermogravimetry. In order to interpret the decomposition mechanisms,…
The single-crystal structures have been determined for aniline and phenol clathrates. Aniline clathrates [M(en)2Ni(CN)4]·2PhNH2(M = Ni, Cu, Zn or Cd; en = 1,2-diaminoethane) are isomorphous, having monoclinic space group P21/c(Z= 2). The unit cell parameters a, b, c and β, and R index for the reflections used are: M =…
Abstract The synthesis and characterization of a new series of polypropylenimine dendrimers is reported. Using a repetition of the sequence of a Michael addition to a primary amine, followed by a heterogeneously catalyzed hydrogenation, ultra‐pure polypropylenimine macromolecules with molecular weights up to 6912 are…
Cells organize many of their biochemical reactions in non-membrane compartments. Recent evidence has shown that many of these compartments are liquids that form by phase separation from the cytoplasm. Here we discuss the basic physical concepts necessary ...Read More
A modified charge simulation method for calculating the electric potential and field distribution along AC HV outdoor insulators is presented. The salient feature of this method is the significantly smaller number of unknowns and the corresponding reduction in computational complexity when compared to earlier charge s…
The convergent growth approach to dendritic macromolecules is a versatile method for the preparation of globular molecules with highly controlled three-dimensional architectures. The method, inspired from a classical organic disconnection approach, starts growth of the globular dendrimer at what will become its chain-…
CeO 2 films were epitaxially grown on Si(111) substrates by reactive sputtering following the single-crystal CeO 2 seed layer formation by oxygen-reactive solid-phase epitaxy. Formation of metallic Ce layers and oxidation of the layers prior to reactive sputtering was found to be the key process for epitaxial growth o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of poly(N-isopropylacrylamide) on silica surfacesTohru Tanahashi, Masami Kawaguchi, Takako Honda, and Akira TakahashiCite this: Macromolecules 1994, 27, 2, 606–607Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published iniss…
CuO–TiO2 samples have been prepared by impregnation of two different preformed TiO2 supports with copper nitrate, and have been characterized by X-ray diffraction (XRD), thermogravimetry–differential thermal analysis (TG–DTA), Fourier-transform infrared (FTIR), Fourier-transform far-infrared (FT-FIR) and ultraviolet–v…