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Bare and Effective Charge of Mesoporous Silica Particles

Valetti, Sabrina; Feiler, Adam and Trulsson, Martin LU (2017) In Langmuir 33(29). p.7343-7351
Abstract

We develop and combine a novel numerical model, within the Poisson-Boltzmann framework, with classical experimental titration techniques for mesoporous silica particles to study the charging behavior as both pH and the amount of monovalent salt are varied. One key finding is that these particles can be considered to have an effectively or apparent electroneutral inner core with an effectively charged rim. As a consequence, the total apparent charge of the particle is several orders of magnitude smaller than that of the bare silica charge, which accounts only for the charged silanol groups of the mesoporous silica particles and which has its major contribution from the interior. Hence, the interior dictates the mesoporous silicas' bare... (More)

We develop and combine a novel numerical model, within the Poisson-Boltzmann framework, with classical experimental titration techniques for mesoporous silica particles to study the charging behavior as both pH and the amount of monovalent salt are varied. One key finding is that these particles can be considered to have an effectively or apparent electroneutral inner core with an effectively charged rim. As a consequence, the total apparent charge of the particle is several orders of magnitude smaller than that of the bare silica charge, which accounts only for the charged silanol groups of the mesoporous silica particles and which has its major contribution from the interior. Hence, the interior dictates the mesoporous silicas' bare charge while the rim its effective charge. We furthermore report density, charge, and accumulated charge profiles across the particle's interface.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
33
issue
29
pages
9 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85025841212
  • wos:000406573400016
ISSN
0743-7463
DOI
10.1021/acs.langmuir.7b01135
language
English
LU publication?
yes
id
9ad42425-0657-4937-84a6-b2e0ad7f3ed6
date added to LUP
2017-08-02 07:34:06
date last changed
2018-05-20 04:36:20
@article{9ad42425-0657-4937-84a6-b2e0ad7f3ed6,
  abstract     = {<p>We develop and combine a novel numerical model, within the Poisson-Boltzmann framework, with classical experimental titration techniques for mesoporous silica particles to study the charging behavior as both pH and the amount of monovalent salt are varied. One key finding is that these particles can be considered to have an effectively or apparent electroneutral inner core with an effectively charged rim. As a consequence, the total apparent charge of the particle is several orders of magnitude smaller than that of the bare silica charge, which accounts only for the charged silanol groups of the mesoporous silica particles and which has its major contribution from the interior. Hence, the interior dictates the mesoporous silicas' bare charge while the rim its effective charge. We furthermore report density, charge, and accumulated charge profiles across the particle's interface.</p>},
  author       = {Valetti, Sabrina and Feiler, Adam and Trulsson, Martin},
  issn         = {0743-7463},
  language     = {eng},
  month        = {07},
  number       = {29},
  pages        = {7343--7351},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Bare and Effective Charge of Mesoporous Silica Particles},
  url          = {http://dx.doi.org/10.1021/acs.langmuir.7b01135},
  volume       = {33},
  year         = {2017},
}