Microscopy and optical manipulation of dendrimer-built vesicles
| Autor: | Johan Hofkens, Thomas Gensch, G. C. Dol, Albertus P. H. J. Schenning, F. C. De Schryver, E. W. Meijer, Kenji Tsuda, J.W. Weener, Loredana Latterini |
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| Přispěvatelé: | Macromolecular and Organic Chemistry, Macro-Organic Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
SPECTROSCOPY General Chemical Engineering Bilayer Vesicle Analytical chemistry General Chemistry Photochemistry LIQUID-CRYSTALS Fluorescence TRAP FORCE chemistry.chemical_compound Optical tweezers chemistry Azobenzene Dendrimer TIME-RESOLVED FLUORESCENCE AZOBENZENE PARTICLES CHROMOPHORES POLYMERS Time-resolved spectroscopy Alkyl |
| Zdroj: | Pure and Applied Chemistry, 73(3), 435-441. IUPAC Secretariat Scopus-Elsevier |
| ISSN: | 0033-4545 |
| Popis: | A fifth-generation poly(propylene imine) dendrimer decorated with palmitoyl- and azobenzene-containing alkyl groups forms giant vesicles in aqueous solutions with diameters from 50 nm up to 20 mm and a multilaminar onion-like structure. Dense and ordered arrangement of the azobenzene chromophores in the bilayer structure leads to fluorescence with lmax= 600 nm. The fluorescence intensity can be increased by irradiation with blue light, and at low pH a distinctive blue shift of the spectrum is observed. With the aid of a single-beam optical tweezers it is possible to trap vesicles and direct them in a billiard-like fashion against each other using forces in the range of several pN. In collision experiments, the vesicles behave like hard spheres, and merging is not observed. |
| Databáze: | OpenAIRE |
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