By a News Reporter-Staff News Editor at Clinical Trials Week -- Investigators discuss new findings in Clinical Research. According to news reporting originating from Tulsa, Oklahoma, by NewsRx correspondents, research stated, "We have synthesized CdSe nanocrystals (NCs) in sizes from 2.2 to 5.1 nm passivated with hydrophobic trioctylphosphine oxide (TOPO) in combination trioctylphosphine (TOP) or tributylphosphine (TBP) to obtain particles of the type CdSe/TOPO/TOP or CdSe/TOPO/TBP. These NCs were then dispersed in aqueous solution of ionic or non-ionic surfactants (such as stearate, oleic acid, Tween) using a biphase (water and chloroform or hexane) transfer method."
Our news editors obtained a quote from the research from the University of Tulsa, "It is found that both the structure of the surfactant and the native surface of the ligand govern the coating of the NCs with surfactants. More specifically, the hydrophobicity-hydrophilicity balance of the surfactant regulates the coating efficacy, thereby transferring the NC from the organic to the aqueous phase. The type of ligand on the NCs and the kind of coating surfactant also affect photoluminescence (PL). The ratio of PL and absorbance unit (defined as PL per 0.1 AU) was implemented as a tool to monitor changes in PL intensity and wavelength as a function of size, coatings and surface defects. Finally, the distribution of CdSe nanocrystals between pseudophases in cloud point extraction was discussed based on experimental results."
According to the news editors, the research concluded: "It was concluded that the size of CdSe nanocrystal present in an appropriate pseudophase is correlated with the way in which the non-ionic surfactant coats CdSe nanocrystals."
For more information on this research see: Comparative study on coating CdSe nanocrystals with surfactants. Microchimica Acta, 2013;180(13-14):1341-1350. Microchimica Acta can be contacted at: Springer Wien, Sachsenplatz 4-6, PO Box 89, A-1201 Wien, Austria. (Springer - www.springer.com; Microchimica Acta - www.springerlink.com/content/0026-3672/)
The news editors report that additional information may be obtained by contacting S. Oszwaldowski, Univ Tulsa, Dept. of Chem & Biochem, Tulsa, OK 74104, United States (see also Clinical Research).
Keywords for this news article include: Tulsa, Oklahoma, Nanocrystal, United States, Nanotechnology, Clinical Research, Emerging Technologies, North and Central America, Clinical Trials and Studies
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