Quadrupole Scattering in PrNi₅

Abstract

The influence of the dipolar and quadrupolar scattering due to the 4f electrons on the temperature dependence of the electrical resistivity in PrNi, is investigated. Using the experimentaI values of polycrystalline PrNi, and the isostructural LaNi, as well a s the crystalline electric field splitting scheme it is found that the quadrupole scattering is the dominating one.Der EinfluB der Dipol-und Quadrupolstreuung der 4f-Elektronen auf die Temperaturabhangigkeit des elektrischen Widerstandes in PrNi, wird untersucht. Unter Verwendung der experimentellen Daten von polykristallinem PrNi, und der isostrukturellen Verbindung LaNi, sowie der Kristallfeldaufspaltung wird festgestellt, daB dcr dominierende Beitrag von der Quadrupolstreuung herruhrt.

Core–shell biopolymer microspheres for sustained drug release

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Although PLGA and PLA are FDA-approved biodegradable macromolecules, 14 due to their high hydrophobic nature, the polymers need to be dissolved in an organic solvent, usually methylene chloride, chloroform, or ethyl acetate, 1,[10][11][12][13] which are undesirable for safety and environmental reasons. 15,16 Moreover, the acidic byproducts from their degradation can reduce the local solution pH and cause inflammatory responses and foreign body reactions in vivo. 17,18 Therefore, alternative approaches are needed for the preparation of core-shell microspheres.…”