Materials Literature
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The luminescence properties of Cr3+ ions and the energy transfer between Cr3+ and Nd3+ ions have been studied quantitatively in yttrium aluminum garnet (YAG). The energy level diagram and the emission spectrum of 4T2→4A2 transition of Cr3+ ions were calculated in this crystal using the single-configurational-coordinat…
The dynamics of charge carrier trapping and recombination are measured as a function of ZnO cluster diameter by ultrafast pump–probe absorption spectroscopy. A finite spherical potential well model which shows good agreement with previous experimental work is employed to predict ZnO cluster diameters from absorption o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCapped Biscalix[4]arene-Zn-Porphyrin: Metalloreceptor with a Rigid CavityDmitry M. Rudkevich, Willem Verboom, and David N. ReinhoudtCite this: J. Org. Chem. 1995, 60, 20, 6585–6587Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published…
A hyperstable (hs) variant of chicken egg-white lysozyme with enhanced thermal (delta Tm approximately +10.5 degrees C) and chemical (delta Cm for guanidine hydrochloride denaturation = +1.3 M) stabilities relative to wild-type (WT) was constructed by combining several individual stabilizing substitutions. The free en…
Photoluminescence and excitation spectra are observed for Ca(S, Se):Eu 2+ and Sr(S, Se):Eu 2+ powder phosphors at various temperatures between 4.2 and 300 K. The emission band of Ca(S 1- x Se x ):Eu 2+ at 300 K shifts almost linearly with an increase in x , from 652 nm ( x =0) to 597 nm ( x =1). In Sr(S 1- x Se x ):Eu…
Upon treatment of tribenzotriquinacene (4a) (R = H) and its centro-alkyl-substituted derivatives 4b-d (R CH3, C2H5, CH(2)Ph) with the strongly basic mixture of n-BuLi and KO(i)Pen, 2-fold deprotonation combined with (formal) elimination of RH from positions C(1)-C(10) occurs to generate tribenzacepentalene dianion 5-K…
Abstract Aspects of thermal, morphological, and rheological properties of biodegradable poly‐D(‐)(3‐hydeoxybutyrate) (PHB) blended with poly(ethylene oxide) (PEO) have been studied. Thermal properties and morphology of the blends were examined by scanning electron microscopy and differential scanning calorimetry, resp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors influencing the chemical vapor deposition of oriented ZnO films using zinc acetateG. L. Mar, P. Y. Timbrell, and R. N. LambCite this: Chem. Mater. 1995, 7, 10, 1890–1896Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of B Atoms with NH3 to Produce HBNH, BNBH, and B2NCraig A. Thompson and Lester AndrewsCite this: J. Am. Chem. Soc. 1995, 117, 40, 10125–10126Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https:…
Solutions of the diblock copolymer polystyrene/poly-2-vinylpyridine (PS/P2VP) in toluene were studied by cryo-transmission electron microscopy following fast freezing of a thin film of the solution in liquid nitrogen. The block copolymer forms spherical micelles which can be visualized using phase contrast microscopy.…
Currently used sterilization techniques such as ethylene oxide, gamma irradiation, and steam sterilization could introduce inadvertent consequences, especially in polymeric materials. These could have far-reaching effects on the biocompatibility of the materials. Some of these consequences are reviewed and a typical e…
We use Stark spectroscopy to examine the nature of the excited states of CdSe nanocrystallites. The Stark spectra we obtain are in the small coupling limit in which the changes induced by the electric field to the absorption spectrum are small compared to the transition linewidths. Within this limit, we theoretically…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntrapment of Polypyrrole Chains between MoS2 Layers via an in Situ Oxidative Polymerization Encapsulation ReactionLei Wang, Jon Schindler, Joyce Albritton Thomas, Carl R. Kannewurf, and Mercouri G. KanatzidisCite this: Chem. Mater. 1995, 7, 10, 1753–1755Publication Date (Pr…
The dynamics of spreading of simple liquids down straight, narrow ssV grooves open at the top were captured by real-time video imaging. Groove depths in polished copper ranged between 40 and 100 \ensuremath{\mu}m and extended approximately 2 cm with ssV angles of 30\ifmmode^\circ\else\textdegree\fi{}, 60\ifmmode^\circ…
Summary Zein, corn prolamine, was dissolved in several organic solvents to make films and their properties were examined. Ethanol with 20% water and acetone with 30% water were found to dissolve zein well and transform it into a transparent flexible film after moderate drying. Both films showed similar breaking streng…
Stoichiometry issues in lithium tantalate were studied through Czochralski growth of single crystals and vapor transport equilibration (VTE) of crystalline samples to specified Li/Ta compositions. Crystals were characterized through measurement of the ferroelectric Curie temperature Tc. The VTE experiments indicated a…
The reduction of X-ray diffraction data obtained by the Laue method to accurate integrated intensities is more complicated and much less familiar than the reduction of monochromatic data. Problems of data accuracy and completeness have hindered the wide use of the Laue technique in macromolecular crystallography. Its…
Abstract The detailed ethylene oxidation data set of Thornton [1], obtained for a well‐stirred reactor operated fuel‐lean at atmospheric pressure and for temperatures of 1003 K to 1253 K, is used as a basis for the comparison of chemical kinetic mechanisms reported in the literature and for the development of a new et…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of residue curve maps for mixtures with multiple equilibrium chemical reactionsSophie Ung and Michael F. DohertyCite this: Ind. Eng. Chem. Res. 1995, 34, 10, 3195–3202Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published…
A polymer composite cathode prepared from polyaniline and 2,5‐dimercapto‐1,3,4‐thiadiazole shows high gravimetric energy density when it is coupled with a lithium anode. However, charging and discharging currents should be 0.05 mA/cm 2 or less, otherwise the cycle life is shortened. Addition of a polypyrrole derivativ…