Journal article
Aggregation morphology of planar engineered nanomaterials
Journal of colloid and interface science, v 561, pp 849-853
01 Mar 2020
PMID: 31771871
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
In this investigation, the utility of a static light scattering (SLS) technique to characterize aggregate morphology of two-dimensional engineered nanomaterials (2D ENMs) was systematically evaluated. The aggregation of graphene oxide (GO) and lithiated-molybdenum disulfide (Li-MoS2) were measured and compared to that of a spherical reference colloid, carboxylate-modified latex (CML) nanoparticles. The critical coagulation concentration (CCC) for all dispersions was determined via analysis of aggregation kinetics using time-resolved dynamic light scattering. This technique allowed for the elucidation of the transition from the reaction-limited aggregation (RLA) regime to diffusion-limited aggregation (DLA). The findings of this study support the aggregation trends predicted by Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and recent computer simulations of aggregation kinetics. For all nanomaterials, as ionic strength increased towards the respective the CCC, fractal dimension decreased; any increase in ionic strength beyond the CCC did not yield significant change in fractal dimension. Across comparable primary particle sizes and using both carbonaceous (GO) and inorganic (Li-MoS2) 2D ENMs, this study further supports the use of SLS for the measurement of fractal dimension for 2D materials. To further support this claim, the aggregate morphology of GO in both RLA and DLA regimes was measured via cryogenic transmission electron microscopy. (C) 2019 Elsevier Inc. All rights reserved.
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Details
- Title
- Aggregation morphology of planar engineered nanomaterials
- Creators
- S. Drew Story - University of California, RiversideStephen Boggs - University of California, RiversideLinda M. Guiney - Northwestern UniversityMani Ramesh - Northwestern UniversityMark C. Hersam - Northwestern UniversityC. Jeffrey Brinker - University of New MexicoSharon L. Walker - Drexel University
- Publication Details
- Journal of colloid and interface science, v 561, pp 849-853
- Publisher
- Elsevier
- Number of pages
- 5
- Grant note
- UC-CEIN (University of California Center for Environmental Implications of Nanotechnology) - NSF National Science Foundation (NSF) 1144635 / NSF IGERT: Water SENSE - Water Social, Engineering, and Natural Sciences Engagement Program DBI 0830117 / EPA; United States Environmental Protection Agency Environmental Protection Agency (EPA); United States Environmental Protection Agency
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000508752600082
- Scopus ID
- 2-s2.0-85075838332
- Other Identifier
- 991019167889904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical