Analytical Ultracentrifugation Characterization of Differential Sedimentation Size‐Separated Graphene Dispersions
Source abstract
Abstract
Abstract Analytical ultracentrifugation (AUC) is applied to the characterization of as‐dispersed graphene nanoplatelet dispersions and differential sedimentation separated daughter dispersions. The liquid‐phase characterization of AUC is demonstrated to resolve both the broad sedimentation coefficient distributions of as‐dispersed samples and changes in daughter dispersions determined by a protocol of applied differential sedimentation process steps. Comparison is made to measurements on deposited samples by scanning electron microscopy and atomic force microscopy. The value of AUC to rapidly monitor changes in the sedimentation distribution of each particle population is demonstrated to allow tailoring of the differential sedimentation protocol to produce significantly narrower population distributions. This rapid characterization is particularly important for technologies in which dispersed nanoparticles cannot be removed from a solvent solution for microscopy analysis.
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Research context
OpenAlex topics: Graphene research and applications · Nanopore and Nanochannel Transport Studies · 2D Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg MD 20899 USA
Applied Chemicals and Materials Division National Institute of Standards and Technology Boulder CO 80305 USA
Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
Department of Chemistry Northwestern University Evanston IL 60208 USA
Department of Electrical and Computer Engineering Northwestern University Evanston IL 60208 USA
Funding
National Institute of Standards and Technology · National Science Foundation · Center for Hierarchical Materials Design
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