Please use this identifier to cite or link to this item: doi:10.22028/D291-34776
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Title: Percolation of rigid fractal carbon black aggregates
Author(s): Coupette, Fabian
Zhang, Long
Kuttich, Björn
Chumakov, Andrei
Roth, Stephan V.
González-García, Lola
Kraus, Tobias
Schilling, Tanja
Language: English
Title: The Journal of chemical physics
Volume: 155
Issue: 12
Publisher/Platform: American Institute of Physics
Year of Publication: 2021
Publikation type: Journal Article
Abstract: We examine network formation and percolation of carbon black by means of Monte Carlo simulations and experiments. In the simulation, we model carbon black by rigid aggregates of impenetrable spheres, which we obtain by diffusion-limited aggregation. To determine the input parameters for the simulation, we experimentally characterize the micro-structure and size distribution of carbon black aggregates. We then simulate suspensions of aggregates and determine the percolation threshold as a function of the aggregate size distribution. We observe a quasi-universal relation between the percolation threshold and a weighted average radius of gyration of the aggregate ensemble. Higher order moments of the size distribution do not have an effect on the percolation threshold. We conclude further that the concentration of large carbon black aggregates has a stronger influence on the percolation threshold than the concentration of small aggregates. In the experiment, we disperse the carbon black in a polymer matrix and measure the conductivity of the composite. We successfully test the hypotheses drawn from simulation by comparing composites prepared with the same type of carbon black before and after ball milling, i.e., on changing only the distribution of aggregate sizes in the composites.
DOI of the first publication: 10.1063/5.0058503
URL of the first publication: https://aip.scitation.org/doi/10.1063/5.0058503
Link to this record: hdl:20.500.11880/31813
http://dx.doi.org/10.22028/D291-34776
ISSN: 1089-7690
Date of registration: 30-Sep-2021
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Tobias Kraus
Collections:Die Universitätsbibliographie

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