Toxicity studies using SWCNTs have been controversial with conflicting findings reported in that for the same model organism; both toxic and non-toxic effects are detected. Studies focusing on the surfactant role in SWCNT toxicity have been lacking, specifically how the type and structure of surfactant coverage on SWCNT sidewalls affects biological response. Changes to the microenvironment surrounding SWCNT surfaces when entering natural systems will play a critical role in their potential toxicity.In this study, solvatochromic shifts in the photoluminescence signatures of SWCNT suspensions have been used to track changes to these surfactant microenvironments. Additions of model compounds representative of Natural Organic Matter from separate end member environments to SWCNT suspensions results in unique photoluminescence signatures, and therefore various surfactant morphologies on SWCNT surfaces.  Subsequent toxicity studies using these manipulated SWCNT suspensions will link these unique surfactant structures with a range biological responses.

Surfactant driven surface changes on single-walled carbon nanotubes: Toxicological implications

244th National Meeting (2012)

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