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Controlled Morphology (controlled + morphology)
Selected AbstractsSynthesis of Zinc Oxide Nanostructures with Controlled Morphologies Using a Simple Sonochemical MethodJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2007Xi-peng Pu Zinc oxide (ZnO) nanostructures were synthesized by a simple sonochemical method without the assistance of an additional surfactant. The morphologies can simply be controlled only by changing the addition sequence of NH3·H2O. When NH3·H2O was added before or at the beginning of the ultrasonic treatment, a flower-like nanostructure and ellipsoidal particles self-assembled by nanorods were obtained, respectively. The strong visible emission implied high atomic defects. The emission intensity was dependent on the addition sequence of NH3·H2O greatly. [source] Device Performance of APFO-3/PCBM Solar Cells with Controlled MorphologyADVANCED MATERIALS, Issue 43 2009Cecilia M. Björström Svanström Polymer/fullerene solar cells with three different device structures: A) diffuse bilayer, B) spontaneously formed multilayer, and C) vertically homogenous thin films, are fabricated. The photocurrent/voltage performance is compared and it is found that the self-stratified structure (B) yields the highest energy conversion efficiency. [source] Hollow polylactide microcapsules with controlled morphology and thermal and mechanical propertiesAICHE JOURNAL, Issue 11 2009Hassan Sawalha Abstract Hollow polylactide microcapsules were prepared by multistage premix membrane emulsification of polylactide/dichloromethane/oil solutions in water (nonsolvent). The effects of the different oils on the morphology, thermal, and mechanical properties of the hollow microcapsules were investigated. All oils resulted in hollow microcapsules with controlled shell thickness of ,60 nm except for eugenol, in which irregular, massive capsules were obtained. The properties of the microcapsules were strongly dependent on the oil used, for example the thermal transition temperatures found for hollow capsules were lower than for solid particles prepared without any oil. The crystallinity and transition temperatures of the capsules prepared with linear alkanes were higher than for cyclic alkanes; terpenes gave the lowest transition temperatures. The shell stiffness, measured with atomic force microscopy, was highly dependent on the oil used. Capsules prepared with dodecane showed higher stiffness (3.3 N m,1) than with limonene (2 N m,1) or cyclohexane (1.4 N m,1). © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source] Nanoparticle formation of organic compounds with retained biological activityJOURNAL OF PHARMACEUTICAL SCIENCES, Issue 6 2010Gunilla B. Jacobson Abstract Many pharmaceuticals are formulated as powders to aid drug delivery. A major problem is how to produce powders having high purity, controlled morphology, and retained bioactivity. We demonstrate the use of supercritical carbon dioxide as an antisolvent for meeting this need for two model drug systems, quercetin, a sparingly soluble antioxidant, and short interfering RNA (siRNA), which can silence genes. In both cases we achieve retention of bioactivity as well as a narrow particle size distribution in which the particles are free of impurities. © 2009 Wiley-Liss, Inc. and the American Pharmacists Association J Pharm Sci 99: 2750,2755, 2010 [source] | |||||||||||||