Die Wasser-Kohlendioxid Grenzfläche: Strukturbestimmung unter extremen Bedingungen

• Applicant: Professor Dr. Metin Tolan
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2007 to 2011
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 38253396

• Final Report Year: 2014

Final Report Abstract

Im Rahmen des Projektes konnte erstmalig die Hydratbildung an Grenzflächen in-situ studiert werden. Ein großer Erfolg war die Messung von Hydrat-Kristalliten an der Wasser-Kohlendioxid-Grenzfläche. Dadurch konnte das Modell der sog. local structuring hypothesis erstmalig bestätigt werden. Weiterhin konnte die Hydratbildung an der Wasser-Gas-Grenzfläche allgemein quantitativ untersucht und generelle Mechanismen identifiziert werden. Bevor eine makroskopische Hydratbildung einsetzen kann, bildet sich zunächst eine Nanometer dicke Schicht an der Grenzfläche, in der die Gasmoleküle stark angereichert sind. Damit konnten die wesentlichen Ziele des Projektes erreicht werden.

Publications

• A sample cell to study hydrate formation with x-ray scattering, Review of Scientific Instruments 80, 026103 (2009)
  H. Conrad, F. Lehmkühler, C. Sternemann, O. Feroughi, L. Simonelli, S. Huotari, and M. Tolan
  
• Analysis of Hofmeister effects on the density profile of protein adsorbates: A neutron reflectivity study, Journal of Physical Chemistry B 113, 8462 (2009)
  F. Evers, R. Steitz, M. Tolan, and C. Czeslik
  
• Elucidating the mechanism of lipid membraneinduced IAPP fibrillogenesis and its inhibition by the red wine compound resveratrol: A synchrotron x-ray reflectivity study, Journal of the American Chemical Society 131, 9516 (2009)
  F. Evers, C. Jeworrek, S. Tiemeyer, K. Weise, D. Sellin, M. Paulus, B. Struth, M. Tolan, and R. Winter
  
• Tetrahydrofuran clathrate hydrate formation, Physical Review Letters 103, 218301 (2009)
  H. Conrad, F. Lehmkühler, C. Sternemann, A. Sakko, D. Paschek, L. Simonelli, S. Huotari, O. Feroughi, M. Tolan, and K. Hämäläinen
  
• The carbon dioxide-water interface at conditions of gas hydrate formation, Journal of the American Chemical Society 131, 585 (2009)
  F. Lehmkühler, M. Paulus, C. Sternemann, D. Lietz, F. Venturini, C. Gutt, and M. Tolan
  
• Anomalous energetics in tetrahydrofuran clathrate hydrate revealed by x-ray Compton scattering, Journal of Physical Chemistry Letters 1, 2832 (2010)
  F. Lehmkühler, A. Sakko, C. Sternemann, M. Hakala, K. Nygard, C.J. Sahle, S. Galambosi, I. Steinke, S. Tiemeyer, A. Nyrow, T Buslaps, D. Pontoni, M. Tolan, and K. Hämäläinen
  
• Probing adsorption and aggregation of insulin at a poly(acrylic acid) brush, Physical Chemistry Chemical Physics 12, 4375 (2010)
  F. Evers, R. Steitz, M. Tolan, C. Czeslik
  
• Concentration induced wetting transition in water-tetrahydrofuran-isobutane systems, Journal of Physical Chemistry C 115, 18235 (2011)
  L. Boewer, M. Paulus, F. Lehmkühler, and M. Tolan
  
• Effects of specific versus nonspecific ionic interactions on the structure and lateral organization of lipopolysaccharides, Biophysical Journal 100, 2169 (2011)
  C. Jeworrek, F. Evers, J. Howe, K. Brandenburg, M.Tolan, and R. Winter
  
• Reduced protein adsorption by osmolytes, Langmuir 27, 6995 (2011)
  F. Evers, R. Steitz, M. Tolan, C. Czeslik
  
• Structure and phase behavior of archaeal lipid monolayers, Langmuir 27, 13113 (2011)
  C. Jeworrek, F. Evers, M. Erlkamp, Se. Grobelny, M. Tolan, P. Lee-Gau Chong, R. Winter
  
• Temperature induced structural changes of tetrahydrofuran clathrate and of the liquid water/tetrahydrofuran mixture, Journal of Physical Chemistry C 115, 21009 (2011)
  F. Lehmkühler, A. Sakko, I. Steinke, C. Sternemann, M. Hakala, Ch.J. Sahle, T. Buslaps, L. Simonelli, S. Galambosi, M. Paulus, T. Pylkkänen, M. Tolan, and K. Hämäläinen
  
• Cross-amyloid interaction of Abeta and IAPP at lipid membranes, Angewandte Chemie International Edition 51, 679 (2012)
  J. Seeliger, F. Evers, Ch. Jeworrek, S. Kapoor, K. Weise, E. Andretto, M. Tolan, A. Kapurniotu, and R. Winter
  (See online at https://doi.org/10.1002/anie.201105877)
• Detection of lipid raft domains in neutral and anionic Langmuir monolayers and bilayers of complex lipid composition, Soft Matter 8, 2170 (2012)
  F. Evers, Ch. Jeworrek, K. Weise, M. Tolan, and R. Winter
  (See online at https://doi.org/10.1039/c2sm06835d)
• On the spontaneous formation of clathrate hydrates at water-guest interfaces, Journal of Physical Chemistry C 116, 8548 (2012)
  L. Böwer, J. Nase, M. Paulus, F. Lehmkühler, S. Tiemeyer, S. Holz, D. Pontoni, and M. Tolan
  (See online at https://doi.org/10.1021/jp211784w)
• Subsurface influence on the structure of protein adsorbates revealed by in-situ x-ray reflectivity, Langmuir 28, 7747 (2012)
  H. Hähl, F. Evers, S. Grandthyll, M. Paulus, C. Sternemann, P. Loskill, M. Lessel, A.K. Hüsecken, T. Brenner, M. Tolan, and K. Jacobs
  (See online at https://doi.org/10.1021/la300850g)