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Studies from McMaster University Reveal New Findings on Interface Science

February 25, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Interface Science. According to news reporting originating from Hamilton, Canada, by VerticalNews correspondents, research stated, "This paper reports the production of well-defined, highly stable Ag-Au alloy nanoparticles (NPs) using living cells of Chlamydomonas reinhardtii, with the composition of the bimetallic alloys being solely determined by the stoichiometric ratio in which the metal salts were added to the cultures. The NPs exhibited a single, well-defined surface plasmon resonance (SPR) band confirming that they were made of a homogeneous population of bimetallic alloys."

Our news editors obtained a quote from the research from McMaster University, "Particle creation by the cells occurred in three stages: (1) internalization of the noble metals by the cells and their reduction resulting in the formation of the NPs; (2) entrapment of the NPs in the extracellular matrix (ECM) surrounding the cells, where they are colloidally stabilized; and (3) release of the NPs from the ECM to the culture medium. We also investigated the effect of the addition of the metals salts on cell viability and the impact on characteristics of the NPs formed. When silver was added to the cultures, cell viability was decreased and this resulted in a similar to 30 nm red shift on the SPR band due to changes in the surrounding environment into which the NPs were released."

According to the news editors, the research concluded: "The same observations (in SPR and cell viability) was made when gold was added to a final concentration of 2 x 10(-4) M, but not when the concentration was equal to 10(-4) M, where cell viability was high and the red shift was negligible."

For more information on this research see: Stoichiometrically controlled production of bimetallic Gold-Silver alloy colloids using micro-alga cultures. Journal of Colloid and Interface Science, 2014;416():67-72. Journal of Colloid and Interface Science can be contacted at: Academic Press Inc Elsevier Science, 525 B St, Ste 1900, San Diego, CA 92101-4495, USA. (Elsevier -; Journal of Colloid and Interface Science -

The news editors report that additional information may be obtained by contacting S.A. Dahoumane, McMaster University, Dept. of Chem Engn, Hamilton, ON L8S 4M1, Canada. Additional authors for this research include K. Wijesekera, C.D.M. Filipe and J.D. Brennan.

Keywords for this news article include: Canada, Ontario, Hamilton, Interface Science, North and Central America

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Source: Journal of Technology

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