Fluorescent Monodisperse Silica Ellipsoids for Optical Rotational Diffusion Studies Export

@article{Sacanna2006, abstract = {We report on the preparation of monodisperse, fluorescent hematitesilica coreshell ellipsoids, with adjustable shapes ranging from spindles to nearly spheres, that are suitable for optical rotational diffusion studies. Hematite cores are grafted with poly(vinylpyrrolidone) which ensures colloidal stability during the silica coating provided by the base-catalyzed hydrolysis and polymerization of tetraethoxysilane. Using tetramethylammonium hydroxide as base instead of the volatile ammonia facilitates continuous seeded growth of silica to colloids with a desired aspect ratio. A convenient feature of the hematitesilica particles is the rapid dissolution of the iron oxide core by acid, producing hollow silica ellipsoids that can be optically matched to near transparency. The control of shape and size of the silica ellipsoids, their optical properties, and the fairly high yield in comparison to other preparation methods for nonspherical model colloids make the ellipsoids very suitable for quantitative studies. As a case in point, we have measured the rotational diffusion coefficient of fluorescent ellipsoids with rotational fluorescence recovery after photobleaching. Dye-labeled ellipsoids can be imaged with confocal microscopy.}, address = {Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands}, author = {Sacanna, S. and Rossi, L. and Kuipers, B. W. M. and Philipse, A. P.}, citeulike-article-id = {1427736}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/la052484o}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/la052484o}, day = {1}, doi = {10.1021/la052484o}, journal = {Langmuir}, keywords = {packing, rod\_synthesis}, month = {February}, number = {4}, pages = {1822--1827}, posted-at = {2009-08-13 16:07:18}, priority = {2}, title = {Fluorescent Monodisperse Silica Ellipsoids for Optical Rotational Diffusion Studies}, url = {http://dx.doi.org/10.1021/la052484o}, volume = {22}, year = {2006} }

TY - JOUR ID - Sacanna2006 L3 - citeulike-article-id:1427736 N2 - We report on the preparation of monodisperse, fluorescent hematitesilica coreshell ellipsoids, with adjustable shapes ranging from spindles to nearly spheres, that are suitable for optical rotational diffusion studies. Hematite cores are grafted with poly(vinylpyrrolidone) which ensures colloidal stability during the silica coating provided by the base-catalyzed hydrolysis and polymerization of tetraethoxysilane. Using tetramethylammonium hydroxide as base instead of the volatile ammonia facilitates continuous seeded growth of silica to colloids with a desired aspect ratio. A convenient feature of the hematitesilica particles is the rapid dissolution of the iron oxide core by acid, producing hollow silica ellipsoids that can be optically matched to near transparency. The control of shape and size of the silica ellipsoids, their optical properties, and the fairly high yield in comparison to other preparation methods for nonspherical model colloids make the ellipsoids very suitable for quantitative studies. As a case in point, we have measured the rotational diffusion coefficient of fluorescent ellipsoids with rotational fluorescence recovery after photobleaching. Dye-labeled ellipsoids can be imaged with confocal microscopy. IS - 4 JF - Langmuir AD - Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands EP - 1827 TI - Fluorescent Monodisperse Silica Ellipsoids for Optical Rotational Diffusion Studies VL - 22 SP - 1822 KW - packing KW - rod_synthesis AU - Sacanna, S AU - Rossi, L AU - Kuipers, BWM AU - Philipse, AP PY - 2006/02/01/ UR - http://dx.doi.org/10.1021/la052484o ER -