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Träfflista för sökning "WFRF:(van Bokhoven Hans) srt2:(2010-2014)"

Sökning: WFRF:(van Bokhoven Hans) > (2010-2014)

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1.
  • Brown, Matthew, et al. (författare)
  • Effect of Surface Charge Density on the Affinity of Oxide Nanoparticles for the Vapor–Water Interface
  • 2013
  • Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 29:16, s. 5023-5029
  • Tidskriftsartikel (refereegranskat)abstract
    • Using in-situ X-ray photoelectron spectroscopy at the vapor–water interface, the affinity of nanometer-sized silica colloids to adsorb at the interface is shown to depend on colloid surface charge density. In aqueous suspensions at pH 10 corrected Debye–Hückel theory for surface complexation calculations predict that smaller silica colloids have increased negative surface charge density that originates from enhanced screening of deprotonated silanol groups (≡Si–O–) by counterions in the condensed ion layer. The increased negative surface charge density results in an electrostatic repulsion from the vapor–water interface that is seen to a lesser extent for larger particles that have a reduced charge density in the XPS measurements. We compare the results and interpretation of the in-situ XPS and corrected Debye–Hückel theory for surface complexation calculations with traditional surface tension measurements. Our results show that controlling the surface charge density of colloid particles can regulate their adsorption to the interface between two dielectrics.
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  • Sá, Jacinto, et al. (författare)
  • Transient mid-IR study of electron dynamics in TiO2 conduction band.
  • 2013
  • Ingår i: The Analyst. - : Royal Society of Chemistry (RSC). - 0003-2654 .- 1364-5528. ; 138:7, s. 1966-70
  • Tidskriftsartikel (refereegranskat)abstract
    • The dynamics of TiO2 conduction band electrons were followed with a novel broadband synchrotron-based transient mid-IR spectroscopy setup. The lifetime of conduction band electrons was found to be dependent on the injection method used. Direct band gap excitation results in a lifetime of 2.5 ns, whereas indirect excitation at 532 nm via Ru-N719 dye followed by injection from the dye into TiO2 results in a lifetime of 5.9 ns.
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  • Resultat 1-4 av 4

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