Experimental and theoretical evidence of overcharging of calcium silicate hydrate
(2007) In Journal of Colloid and Interface Science 309(2). p.303-307- Abstract
- Electrokinetic measurements such as electrophoresis may show an inversion of the effective surface charge of colloidal particle called overcharging. This phenomenon has been studied by various theoretical approaches but up to now very few attempts of confrontation between theory and experiment have been conducted. In this work we report electrophoretic measurements as well as Monte Carlo simulations of the electrokinetic potential for the surf ice of calcium silicate hydrate (C-S-H), which is the major constituent of hydrated cement. In the simulations, the surface charge of C-S-H nanoparticles in equilibrium with the ionic solution is determined by a single site characteristic and electrostatic interactions between all explicit charges at... (More)
- Electrokinetic measurements such as electrophoresis may show an inversion of the effective surface charge of colloidal particle called overcharging. This phenomenon has been studied by various theoretical approaches but up to now very few attempts of confrontation between theory and experiment have been conducted. In this work we report electrophoretic measurements as well as Monte Carlo simulations of the electrokinetic potential for the surf ice of calcium silicate hydrate (C-S-H), which is the major constituent of hydrated cement. In the simulations, the surface charge of C-S-H nanoparticles in equilibrium with the ionic solution is determined by a single site characteristic and electrostatic interactions between all explicit charges at the surface and in the electric double layer. We will show that ordinary electrostatic interactions are enough to describe all experimental observations. Actually, an excellent agreement is found between experimental and simulated results without any fitting parameter, both with respect to surface titration and electrokinetic behaviour. The agreement extends over a wide range of electrostatic coupling, from a weakly charged surface with mainly monovalent counter-ions to a highly charged one with divalent counter-ions. (C) 2007 Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/662595
- author
- Labbez, Christophe LU ; Nonat, Andre ; Pochard, Isabelle and Jönsson, Bo LU
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- surface, Monte Carlo simulation, overcharging, calcium silicate hydrate, charge titration, zeta potential
- in
- Journal of Colloid and Interface Science
- volume
- 309
- issue
- 2
- pages
- 303 - 307
- publisher
- Elsevier
- external identifiers
-
- wos:000245967700014
- scopus:34047263435
- ISSN
- 1095-7103
- DOI
- 10.1016/j.jcis.2007.02.048
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)
- id
- f02b80dd-109b-4008-b25d-6991c4342eee (old id 662595)
- date added to LUP
- 2016-04-01 12:28:10
- date last changed
- 2023-01-03 08:56:20
@article{f02b80dd-109b-4008-b25d-6991c4342eee,
abstract = {{Electrokinetic measurements such as electrophoresis may show an inversion of the effective surface charge of colloidal particle called overcharging. This phenomenon has been studied by various theoretical approaches but up to now very few attempts of confrontation between theory and experiment have been conducted. In this work we report electrophoretic measurements as well as Monte Carlo simulations of the electrokinetic potential for the surf ice of calcium silicate hydrate (C-S-H), which is the major constituent of hydrated cement. In the simulations, the surface charge of C-S-H nanoparticles in equilibrium with the ionic solution is determined by a single site characteristic and electrostatic interactions between all explicit charges at the surface and in the electric double layer. We will show that ordinary electrostatic interactions are enough to describe all experimental observations. Actually, an excellent agreement is found between experimental and simulated results without any fitting parameter, both with respect to surface titration and electrokinetic behaviour. The agreement extends over a wide range of electrostatic coupling, from a weakly charged surface with mainly monovalent counter-ions to a highly charged one with divalent counter-ions. (C) 2007 Elsevier Inc. All rights reserved.}},
author = {{Labbez, Christophe and Nonat, Andre and Pochard, Isabelle and Jönsson, Bo}},
issn = {{1095-7103}},
keywords = {{surface; Monte Carlo simulation; overcharging; calcium silicate hydrate; charge titration; zeta potential}},
language = {{eng}},
number = {{2}},
pages = {{303--307}},
publisher = {{Elsevier}},
series = {{Journal of Colloid and Interface Science}},
title = {{Experimental and theoretical evidence of overcharging of calcium silicate hydrate}},
url = {{http://dx.doi.org/10.1016/j.jcis.2007.02.048}},
doi = {{10.1016/j.jcis.2007.02.048}},
volume = {{309}},
year = {{2007}},
}