AI Article Synopsis
- VSFS was employed to analyze gauche defects in ODA monolayers at the air/water interface, revealing important information about the monolayer's hydrophobic region.
- The presence of gauche conformers increases as the monolayer transitions from solid to liquid phase, affecting its microscopic structure.
- By utilizing temperature-dependent spectra and the Clapeyron equation, researchers obtained the first in situ measurements of entropy and enthalpy changes related to these conformers in the monolayer.
Article Abstract
Vibrational sum-frequency spectroscopy (VSFS) was used to study gauche defects in octadecylamine (ODA) monolayers at the air/water interface. The VSFS spectra provide unique insights into phase transitions that occur as a result of changes in the structure of the monolayer's hydrophobic region. These changes can be attributed to the increased presence of gauche conformers in the ODA alkyl chains during the monolayer's transition from the solid to liquid phase. Temperature-dependent spectra from monolayers at several different pressures were used to assign the phase transition temperature based on the observed changes in microscopic structure. Through application of a two-dimensional form of the Clapeyron equation, the first in situ measurements of the entropy and enthalpy changes associated with gauche conformers in a monolayer were made.
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| http://dx.doi.org/10.1021/ja036735w | DOI Listing |
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