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Title: Quantitative imaging and in situ concentration measurements of quantum dot nanomaterials in variably saturated porous media

Knowledge of the fate and transport of nanoparticles in the subsurface environment is limited, as techniques to monitor and visualize the transport and distribution of nanoparticles in porous media and measure their in situ concentrations are lacking. To address these issues, we have developed a light transmission and fluorescence method to visualize and measure in situ concentrations of quantum dot (QD) nanoparticles in variably saturated environments. Calibration cells filled with sand as porous medium and various known water saturation levels and QD concentrations were prepared. By measuring the intensity of the light transmitted through porous media exposed to fluorescent light and by measuring the hue of the light emitted by the QDs under UV light exposure, we obtained simultaneously in situ measurements of water saturation and QD nanoparticle concentrations with high spatial and temporal resolutions. Water saturation was directly proportional to the light intensity. A linear relationship was observed between hue-intensity ratio values and QD concentrations for constant water saturation levels. Lastly, the advantages and limitations of the light transmission and fluorescence method as well as its implications for visualizing and measuring in situ concentrations of QDs nanoparticles in the subsurface environment are discussed.
Authors:
 [1] ;  [2] ;  [3] ;  [3]
  1. Tubitak Marmara Research Center, Kocaeli (Turkey)
  2. Univ. of Illinois at Chicago, Chicago, IL (United States)
  3. Clemson Univ., Anderson, SC (United States)
Publication Date:
OSTI Identifier:
1234980
Grant/Contract Number:
FG02-06ER64193
Type:
Published Article
Journal Name:
Journal of Nanomaterials
Additional Journal Information:
Journal Volume: 2016; Journal ID: ISSN 1687-4110
Publisher:
Hindawi
Research Org:
Univ. of Illinois at Chicago, Chicago, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE