112 Philip Guerrero

the increase in viscoelasticity results from the interaction of DSS with both
macromolecular components. The interaction of DSS with BSA leads to the
screening of BSA tryptophanyls from the aqueous environment.
Such interaction is not accompanied by the polarization of the protein,
whereas the affinity of DSS to dextran results in an increase of viscoelasticity
and in an appreciable change in the microstructure of the DSS/dextran
mixture.
It was assumed that similar to compatibilization of polymer blends
by diblock copolymers, the driving force for inducing mixing of water/
BSA/dextran emulsions by DSS results from the affinity of strong
polyelectrolytes to both macromolecular components of the mixture.

ULTRA-SMALL CDS QUANTUM DOTS

CAPPED BY AMINE POLYELECTROLYTES*

Oleksandra E. Rayevska^1 , Oleksandr L. Stroyuk1,†,

Galyna Y. Grodzyuk^1 , Stepan Y. Kuchmiy^1 , Volodymyr

M. Dzhagan2,# and Mykhailo Y. Valakh^2

(^1) L.V. Pysarzhevsky Institute of Physical Chemistry of National Academy
of Sciences of Ukraine, 31 Nauky prosp., Kyiv, Ukraine
(^2) V.E. Lashkaryov Institute of Semiconductor Physics of National Academy
of Sciences of Ukraine, 41 Nauky prosp., Kyiv, Ukraine
Ultra-small, 1.8−2.3 nm, CdS quantum dots (QDs) stabilized
by polyethyleneimine (PEI) in water and guanidine dendrimers in
dimethylformamide were prepared. CdS-PEI QDs have narrow size
distribution of around 10% and photoluminescence emitted in a broad range of
400 600 nm with the quantum yields of 1020%. Photoluminescence decay
kinetics of CdS-PEI QDs is very non-exponential with an average radiative
life time growing from ~15 to ~80 ns with the light quantum energy varying

• The full version of this chapter can be found in Handbook of Functional Nanomaterials.
  Volume 1 - Synthesis and Modification, edited by Mahmood Aliofkhazraei, published by
  Nova Science Publishers, Inc, New York, 2013.
  † Email: [email protected]

  Email: [email protected]