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  Influence of Residual Silanol Groups on Solvent and Ion Distribution at a Chemically Modified Silica Surface

Melnikov, S. M., Höltzel, A., Seidel-Morgenstern, A., & Tallarek, U. (2009). Influence of Residual Silanol Groups on Solvent and Ion Distribution at a Chemically Modified Silica Surface. The Journal of Physical Chemistry C, 113(21), 9230-9238. doi:10.1021/jp8098544.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-938B-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-B55A-1
Genre: Journal Article

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 Creators:
Melnikov, S. M.1, Author              
Höltzel, A.2, Author
Seidel-Morgenstern, A.1, 3, Author              
Tallarek, U.2, Author
Affiliations:
1Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, ou_1738150              
2Philipps-Universität Marburg, Department of Chemistry, Marburg, Germany, ou_persistent22              
3Otto-von-Guericke-Universität Magdeburg, External Organizations, ou_1738156              

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 Abstract: We report on molecular dynamics simulations of solvent and ion distribution at a prototypic alkyl-modified silica surface under explicit consideration of residual silanol group activity. The model contains two β-cristobalite silica walls with dimethyloctylsilyl (C8) ligands as the main modification and trimethylsilyl groups for end-capping, grafted at surface densities of 2.95 μmol/m2 and 0.85 μmol/m2, respectively. Residual silanol groups are present at a surface density of 3.8 μmol/m2. The mobile phase consists of water/acetonitrile mixtures over the whole range of volumetric compositions. We have studied the two limiting cases of residual silanol group activity: (i) undissociated silanol groups, and (ii) dissociated silanol groups with sodium ions as counterions. Solvent and ion distribution in the system as well as the orientational arrangement of solvent molecules and the conformation of the bonded phase are presented for both cases of residual silanol activity. We analyze the influence of mobile phase composition on system conformation to illustrate that the presence of residual silanol groups in their ionized, sodium salt form induces larger changes than a variation of the water/acetonitrile mixture. Copyright © 2009 American Chemical Society [accessed July 24, 2009]

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 433494
DOI: 10.1021/jp8098544
Other: 53/09
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Title: The Journal of Physical Chemistry C
  Other : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 113 (21) Sequence Number: - Start / End Page: 9230 - 9238 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766