Reflection–absorption FT-IR spectroscopy of pentadecanoic acid at the air/water interface

Insights into the Headgroup and Chain Length Dependence of Surface Characteristics of Organic-Coated Sea Spray Aerosols

“…All of the fatty acids and corresponding methyl esters commonly possess saturated hydrocarbon chains with different chain lengths. IRRAS bands arising from these alkyl chains provide the clear spectra and, hence, reliable information about molecular conformation in the monolayers . The peak heights and areas of the ν a (CH 2 ) and ν s (CH 2 ) stretching vibrations indicate the packing density of the alkyl chains .…”

“…[25][26][27] There are extensive studies elucidating the microscopic profile of Langmuir films of saturated fatty acids at the air-water interface using IRRAS. 4,[28][29][30] In addition, fatty acid methyl esters are also known to be able to form organized structures at the air-water interface. [31][32][33][34] Previous studies of saturated long chain fatty acid and fatty acid methyl ester monolayers were carried out at the airwater interface with IRRAS technique, by which the conformational order of the monolayers were shown to be increased with increasing alkyl chain-length.…”

“…As a fast and non-destructive method, IRRAS is quite sensitive to monomolecular films . The application of IRRAS enables us to acquire knowledge of the molecular structure, conformation, and orientation of the film-forming species. − There are extensive studies elucidating the microscopic profile of Langmuir films of long-chain fatty acids at the air–aqueous interface using IRRAS. ,− In addition, the formation of fatty acid methyl ester monolayers with organized structures on the liquid subphase has also been reported. − Previous studies of saturated long-chain fatty acid and methyl ester monolayers were carried out at the air–water interface with IRRAS, by which the conformational order of the monolayers was found to be increased with an increasing length of the alkyl chain. , The response of SA and AA monolayers to atmosphere-relevant inorganic ions was explored by Langmuir and IRRAS methods, which found the presence of inorganic ions in the monolayers and their effect on the interfacial characteristics of aqueous-phase aerosols . Former investigations were mainly conducted on pure water (PW) or ion-containing subphases.…”

Ellipsometry and Infrared Reflection Absorption Spectroscopy of Adsorbed Layers of Soluble Surfactants at the Air–Water Interface

“…The baselines were adjusted slightly before these calculations. This was primarily done for fitting the asymmetric methylene stretch (near 2925 cm −1 ), as the spectral parameters for this band can give information about the relative ordering of the hydrocarbon chains in the monolayer (14,15). Peak positions, full widths at half maximum (FWHM), integrated areas, and peak heights for the asymmetric methylene stretch are shown in Table 4, and the integrated reflectance-absorbances are plotted in Fig.…”

Surface activity coefficients of spread monolayers of behenic acid salts at air–water interface

“…Oichi et al [16] discussed the monolayer properties of fatty acid salts at high pH values. Several other workers [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] have made an attempt to explain the deviation of the properties of the pressure-area isotherms of the ionized monolayers from their ideal behavior from physico-chemical standpoints.…”