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111.
Marissa Volz Ulrich Ziener Ulrich Salz Jörg Zimmermann Katharina Landfester 《Colloid and polymer science》2007,285(6):687-692
The solid photoinitiator Lucirin TPO was encapsulated within a polymer shell by using the miniemulsion process. A solution
of Lucirin TPO in methyl methacrylate (MMA) or butyl acrylate (BA)/MMA mixture was miniemulsified in water followed by a polymerization
process in which phase separation of the Lucirin TPO and the formed polymer led to amorphously solidified Lucirin TPO nanoparticles
encapsulated by polymer. These nanocapsules were freeze-dried and could be redispersed in acidic monomers, which are applied
in polymeric dental adhesives. It is shown by 1H nuclear magnetic resonance spectroscopy that the shell separates the Lucirin TPO, which is sensitive to degradation in acidic
media, from an ambient acidic monomer phase and protects it from fast decomposition. Investigations of the release kinetics
of Lucirin TPO from the nanocapsules reveal that the kinetics are strongly dependent on the composition of the surrounding
continuous phase. 相似文献
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Molecules are created from a Bose-Einstein condensate of atomic 87Rb using a Feshbach resonance. A Stern-Gerlach field is applied, in order to spatially separate the molecules from the remaining atoms. For detection, the molecules are converted back into atoms, again using the Feshbach resonance. The measured position of the molecules yields their magnetic moment. This quantity strongly depends on the magnetic field, thus revealing an avoided crossing of two bound states at a field value slightly below the Feshbach resonance. This avoided crossing is exploited to trap the molecules in one dimension. 相似文献
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We report on the nucleation and growth of tetracene in a thin liquid film which is continuously supersaturated by vapor deposition of molecules onto the film. In a first stage, nucleation and fast anisotropic two-dimensional dendritic growth occurs. In a second stage, the dendrites coarsen into pallet-shaped crystals. These are highly oriented with respect to the plane of the liquid film and reach a lateral size of several 100 microm. The two-dimensional growth mode is explained by the confined growth geometry in the liquid in combination with the anisotropy of the crystal structure. 相似文献
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For systems ofn identical particles with harmonic two-body interaction a method is derived which allows for anyn the construction of a complete orthonormal set of functions that are translationally invariant and are classified according to energy, permutational symmetry,SU (3), angular momentum, and parity. Moshinsky's method for the determination of translationally invariant states with definite permutational symmetry for harmonic two-body interaction is briefly reviewed and is extended to additionalSU (3)-classification. His method, however, is seen to be restricted to the casesn=3,n=4. 相似文献
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We have made the first detailed measurements of a diffusive supersonic radiation wave in the laboratory. A 10 mg/cm(3) SiO2 foam is radiatively heated by the x-ray flux from a laser-irradiated hohlraum. The resulting radiation wave propagates axially through the optically thick foam and is measured via time-resolved x-ray imaging as it breaks out the far end. The data show that the radiation wave breaks out at the center prior to breaking out at the edges, indicating a significant curvature in the radiation front. This curvature is primarily due to energy loss into the walls surrounding the foam. 相似文献