de.mpg.escidoc.pubman.appbase.FacesBean
Deutsch
 
Hilfe Wegweiser Impressum Kontakt Einloggen
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Zeitschriftenartikel

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

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons86407

Melnikov,  S. M.
Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons86477

Seidel-Morgenstern,  A.
Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;
Otto-von-Guericke-Universität Magdeburg, External Organizations;

Externe Ressourcen
Es sind keine Externen Ressourcen verfügbar
Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

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.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-938B-3
Zusammenfassung
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]