Development of systems for capture, sequestration and tracking of nanomaterials is becoming a significant focus in many aspects of nanotechnology and environmental research. Such measurements are critical for evaluating concentration, distribution and effects of nanoparticles (NPs) for environmental, clinical, epidemiological and occupational exposure studies. This presentation will describe a portable paper-based tracking system that can simultaneously capture and quantify metal oxide NPs in complex environments. The approach involves the use of capture ligands containing ortho-dihydroxy functionality, grafted on filter paper, enabling multivalent binding and formation of strong charge transfer complexes with the NPs. The distinct binding of the NPs to multidentate ligands coupled with the spectral properties of the resulting charge transfer complexes enabled quantitative detection of CeO<sub>2 </sub>NPs in a concentration-dependent manner with the lowest detection limit of 79 mg/L and a linearity range up to 120 mg/L. The binding also produces visual images of the particle content and distribution which provides capabilities for a broad range of applications for separation, characterization and quantification of NPs in a variety of environments. These results can enable further development of devices and separation technologies including platforms for retention of NPs and measurement tools for detection and differentiation of metal oxide NPs based on differences in catalytic reactivity and surface functionality. Development of methodologies for assessing workers exposure to NPs and for measuring presence of NPs in environmental or biological samples could also be envisioned.<br/>

Optical nano-tracker for capture, sequestration and detection of metal oxide nanoparticles

254th National Meeting (2017)

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