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  • American Institute of Physics (AIP)  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of alkyl chain tilt angles in Langmuir monolayers: A comparison of Brewster angle autocorrelation spectroscopy and x-ray diffraction (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 4640-4646 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Brewster angle autocorrelation spectroscopy (BAAS), a combination of Brewster angle microscopy and the photocorrelation technique is a new method for the quantitative characterization of Langmuir monolayers. In this paper we compare tilt angle measurements in octadecanol monolayers performed using BAAS and grazing incidence x-ray diffraction (GIXD). BAAS offers the possibility of tilt angle measurements in Langmuir monolayers—without any fitted parameters—with a precision similar to GIXD, but ten times faster. GIXD, conversely, offers detailed microscopic information not available from BAAS. The swiftness of BAAS is exploited for a detailed analysis of the phase transitions from the L2′ phase to the LS (Rotator I) and LS (Rotator II) phases. The L2′/LS (Rot I) transition is of first order whereas the L2′/LS (Rot II) transition is more probably of weak first order than of second order. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475874
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  • 2
    Electronic Resource
    Electronic Resource
    Hysteresis effects at the tilted to nontilted transition in octadecanol monolayers as observed with Brewster angle autocorrelation spectroscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 7448-7453 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: With Brewster angle autocorrelation spectroscopy involving a combination of Brewster angle microscopy and autocorrelation technique we present quantitative measurements of the tilt angle in octadecanol carried out at the triple point of the next nearest neighbor tilted L2′, the nontilted destorted hexagonal LS(Rot I), and the hexagonal LS(Rot II) phases. We show that the transition from the tilted phase to the nontilted phases, which changes from first order (L2′/LS(Rot I)) to second order (L2′/LS(Rot II)), is associated with strong hysteresis effects in the L2′ phase, leading to an ambiguity of the tilt angle in the vicinty of the triple point. The behavior gives indications for a hindered first-order phase transition within the L2′ phase. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473704
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