NMR study of the adsorption-desorption kinetics of dissolved tetraalanine in MCM-41 mesoporous material.
In this study we show how deuterium magic-angle spinning NMR spectroscopy can be used to investigate the adsorption-desorption kinetics of molecules in solution at surface-liquid interfaces. An aqueous solution of deuterium-labeled tetraalanine is inserted in the pores of MCM-41 mesoporous material, and its 2H MAS NMR spectrum is measured as a function of temperature and fraction of filling of the pores. Prior to this study, the different types of water in MCM-41 are characterized as a function of water loading of the pores. Analysis of 2H MAS sideband line shapes enabled the determination of the adsorption and desorption rates and the activation energies of desorption.
Pizzanelli
Silvia
S
Weizmann Institute of Science, Department of Chemical Physics and Chemical Research Support Unit, Rehovot 76100, Israel.
Kababya
Shifi
S
Frydman
Veronica
V
Landau
Miron
M
Vega
Shimon
S
D000327:Adsorption; D000409:Alanine / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry
C509968:MCM-41; D012996:Solutions; D014867:Water; D012822:Silicon Dioxide; D000409:Alanine