Settling of a charged hydrophobic rigid colloid in aqueous media under generalized gravitational field.
Debye layer
Induced electric field
Numerical solution
Sedimentation
Slip length
Journal
Electrophoresis
ISSN: 1522-2683
Titre abrégé: Electrophoresis
Pays: Germany
ID NLM: 8204476
Informations de publication
Date de publication:
04 2021
04 2021
Historique:
revised:
20
10
2020
received:
16
08
2020
accepted:
25
10
2020
pubmed:
8
11
2020
medline:
19
1
2022
entrez:
7
11
2020
Statut:
ppublish
Résumé
The hindrance created by the induced electric filed on the sedimentation of a charged colloid in an aqueous media is studied through numerical modeling. The colloid is considered to be hydrophobic, sedimenting under gravity or a centrifugal force (generalized gravity). The deformation of the charge cloud around the colloid induces an electric field, which generates electrical dipole force on the colloid. The sedimentation velocity is governed by the balance of an electric force, hydrodynamic drag, and gravitational force. Governing equations based on the first principle of electrokinetics is solved numerically through a control volume approach. The dependence of the sedimentation velocity on the electrical properties and slip length of the colloid is investigated. The sedimentation velocity of the charged colloid is slower than the corresponding uncharged particle and this deviation magnifies as the charge density as well as particle slip length is increased. An enhanced g-factor creates a size dependency of the charged colloids. The induced sedimentation field is obtained to analyze the electrokinetics. Surface hydrophobicity enhances the sedimentation velocity, which in turn manifests the induced sedimentation field. However, the sedimentation velocity of a charged hydrophobic colloid is lower than the corresponding uncharged hydrophobic particle and this deviation manifests as slip length is increased.
Identifiants
pubmed: 33159354
doi: 10.1002/elps.202000240
doi:
Substances chimiques
Colloids
0
Water
059QF0KO0R
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1010-1020Informations de copyright
© 2020 Wiley-VCH GmbH.
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