Search for dissertations about: "sum-frequency"

Showing result 1 - 5 of 23 swedish dissertations containing the word sum-frequency.

  2. 1. Vibrational Sum Frequency Spectroscopy Studies at the Air-Liquid Interface

    Author : Eric Tyrode; Mark Rutland; Paul Davies; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Sum Frequency Generation; SFG; VSFS; surfactant; adsorption; water; surface structure; hydration; surface tension; fluorosurfactants; liquid-air interface; poly ethylene oxide surfactants; surface molecular orientation; acetic acid.; Surface and colloid chemistry; Yt- och kolloidkemi;

    Abstract : In this thesis the structure and hydration of small organic and amphipilic compounds adsorbed at the air-liquid interface, have been studied using the nonlinear optical technique Vibrational Sum Frequency Spectroscopy (VSFS). The second order nature of the sum frequency process makes this technique particularly surface sensitive and very suitable for interfacial studies, as molecules at the surface can be distinguished even in the presence of a vast excess of the same molecules in the bulk. READ MORE

  4. 2. Molecular Insight into Ion-Specific Interactions : Vibrational Sum Frequency Study of the Carboxylic Acid Moiety

    Author : Adrien Sthoer; Eric Tyrode; Paul Cremer; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; specific ion effects; carboxylic acid; fatty acid Langmuir monolayer; vibrational sum frequency spectroscopy; VSFS; Electrical double layer;

    Abstract : Ion specific effects at charged interfaces find numerous applications in colloidal sciences and play a vital role in many biological processes. Despite having been studied for over a century, starting with the work of F. Hofmeister in the 1880s, a comprehensive molecular  understanding remains elusive. READ MORE

  5. 3. Biomimetic Membranes: : Molecular Structure and Stability Studies by Vibrational Sum Frequency Spectroscopy

    Author : Jonathan F.D. Liljeblad; Mark W. Rutland; Magnus C. Johnson; Tore Brinck; Lars Kloo; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Vibrational Sum Frequency Spectroscopy VSFS ; Langmuir monolayer; LB depositon; phospholipids; oxidation; biomimetic membranes; Surface and colloid chemistry; Yt- och kolloidkemi;

    Abstract : In the research presented in this licentiate thesis the surface specific technique Vibrational Sum Frequency Spectroscopy, VSFS, combined with the Langmuir trough has been utilized to investigate Langmuir monolayers and Langmuir-Blodgett (LB) deposited mono- and bilayers of phospholipids. Their molecular structure, stability, and hydration were probed to gain additional understanding of important properties aiming at facilitating the use of such layers as model systems for biological membranes. READ MORE

  6. 4. Second harmonic and sum frequency generation in lithium niobate waveguides

    Author : Fredrik Laurell; Martin Fejer; KTH; []
    Keywords : Fysik; Physics;

    Abstract : .... READ MORE

  7. 5. Study of polycrystalline gold surfaces by potential-dependent optical sum frequency generation

    Author : Sara Boscolo Bibi; Tony Hansson; Magnus Johnson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; kemisk fysik; Chemical Physics;

    Abstract : With the increase in demand for renewable energy, the comprehension of chemical processes is essential to improve the design of catalysts in order to achieve better performance. This thesis summarizes the experimental investigation of redox reactions on polycrystalline gold surfaces by combining electrochemistry with operando surface-specific sum frequency generation (SFG) for a wider anodic potential interval than previously studied in acidic aqueous medium (H3PO4, pH 1). READ MORE