Complex nature of the UV and visible fluorescence of colloidal ZnO nanoparticles
Article Abstract:
The colloidal solution of zinc oxide (ZnO) nanoparticles was investigated through the correlation analysis of the particles' nanosize and spectroscopic characteristics. The absorption, fluorescence spectra and fluorescence decay curves of ZnO nanoparticles excited with 248-nm laser pulses were observed using a time-resolved spectroscopy. Three primary bands were observed during the initial phase of the colloidal ZnO particle growth. The ultraviolet (UV) emission band exhibited a blue shift with decreased particle size although the other short-wave UV band showed absence of shift.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Diffusion and viscosity in a crowded environment: From nano-to macroscale
Article Abstract:
Fluorescence correlation spectroscopy (FCS), photon correlation spectroscopy (PCS) and NMR methods are used to show an unambiguous sharp cross over from nano-to macroviscosity in surfactant solutions. The sharp dependence of the viscosity coefficients on the size of the probe in the nanoregime has important consequences for diffusion-limited reactions in crowded environments like living cells.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Cell models for the primary electroviscous effect
Article Abstract:
The cell models are used to study the primary electroviscous effect in a nondilute suspension of charged spherical particles. The analysis has shown that both hydrodynamic and electroviscous contributions to the effective viscosity are smaller with the Happel boundary condition, indicating that such cell models offer a range of predictions.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
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