Combined Atomic Force Microscopy and Fluorescence Correlation Spectroscopy Measurements to Study the Dynamical Structure of Interfacial Fluids

Langmuir ◽  
2007 ◽  
Vol 23 (9) ◽  
pp. 4988-4992 ◽  
Author(s):  
S. Patil ◽  
G. Matei ◽  
C. A. Grabowski ◽  
P. M. Hoffmann ◽  
A. Mukhopadhyay
Keyword(s):  
Atomic Force Microscopy ◽  
Fluorescence Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Dynamical Structure ◽  
Force Microscopy ◽  
Fluorescence Correlation ◽  
Atomic Force

Light Scattering, Atomic Force Microscopy and Fluorescence Correlation Spectroscopy Studies of Polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) Micelles

2003 ◽  
Vol 68 (11) ◽  
pp. 2120-2138 ◽  
Author(s):  
Miroslav Štěpánek ◽  
Jana Humpolíčková ◽  
Karel Procházka ◽  
Martin Hof ◽  
Zdeněk Tuzar ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Light Scattering ◽  
Fluorescence Correlation Spectroscopy ◽  
Polymeric Nanoparticles ◽  
Correlation Spectroscopy ◽  
Force Microscopy ◽  
Fluorescence Correlation ◽  
Atomic Force ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Polymeric nanoparticles formed by triblock copolymer polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide), PS-PVP-PEO, in aqueous media were studied by a combination of fluorescence correlation spectroscopy with other fluorescence techniques, light scattering and atomic force microscopy. The studied polymeric nanoparticles exist in the form of (i) core/shell micelles in acid solution at pH lower than 4.8 and (ii) three-layer onion micelles at higher pH. Since water is a very strong precipitant for PS, both types of micelles have kinetically frozen spherical PS cores. The cores of micelles in acid media are surrounded by soluble shells formed by partly protonated PVP and PEO, while the cores of micelles in alkaline media are surrounded by compact insoluble layers of deprotonated PVP and soluble PEO shells. The micellization behavior of PS-PVP-PEO micelles is accompanied by secondary aggregation of micelles, which is provoked by stirring, shaking and also by filtration of micellar solutions. Therefore fluorescence correlation spectroscopy (FCS), which, in contrast to light scattering techniques, does not require filtration, was used as the main experimental technique for the characterization of non-aggregated micelles. The binding of a fluorescence probe, octadecylrhodamine B (ORB), to polymeric micelles, was studied before the FCS study of micelles.

scholarly journals Release profiles and morphological characterization by atomic force microscopy and photon correlation spectroscopy of 99mTechnetium-fluconazole nanocapsules

2008 ◽  
Vol 349 (1-2) ◽  
pp. 152-160 ◽  
Author(s):  
Danielle Nogueira de Assis ◽  
Vanessa Carla Furtado Mosqueira ◽  
José Mário Carneiro Vilela ◽  
Margareth Spangler Andrade ◽  
Valbert Nascimento Cardoso
Keyword(s):  
Atomic Force Microscopy ◽  
Photon Correlation Spectroscopy ◽  
Morphological Characterization ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
Force Microscopy ◽  
Atomic Force ◽  
Release Profiles
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