Carboxylic Acids, Survey

Bagby, M. O.

doi:10.1002/0471238961.1921182202010702.a01

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…The solubility of stearic acid is only 0.0029 g/l of water at 20°C [6]. At higher pH level, calcium cannot dissociate so the Ca(C 18 ) 2 remains mainly insoluble.…”

Section: Introductionmentioning

confidence: 98%

Dissolution Study of Salt of Long Chain Fatty Acids (Soap Scum) in Surfactant Solutions. Part I: Equilibrium Dissolution

Soontravanich

Lopez

Sabatini

et al. 2010

J Surfact & Detergents

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Dissolution of calcium salt of a long chain fatty acid or soap scum is a major challenge for hard surface cleaners since soap scum forms when soap is exposed to hard water and has very low water solubility. In this paper, the aqueous equilibrium solubility of calcium octadecanoate (or calcium stearate) was measured as a function of pH as well as chelating agent (ethylenediaminetetraacetate disodium salt) and surfactant concentrations. Anionic, nonionic, and amphoteric surfactants were studied. The highest soap scum solubility was observed at high pH with an amphoteric surfactant. Under this condition, the chelant effectively binds calcium, and the stearate anion forms mixed micelles well with the amphoteric surfactant, which is in zwitterionic form at high pH.

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“…The solubility of stearic acid is only 0.0029 g/l of water at 20°C [6]. At higher pH level, calcium cannot dissociate so the Ca(C 18 ) 2 remains mainly insoluble.…”

Section: Introductionmentioning

confidence: 98%

Dissolution Study of Salt of Long Chain Fatty Acids (Soap Scum) in Surfactant Solutions. Part I: Equilibrium Dissolution

Soontravanich

Lopez

Sabatini

et al. 2010

J Surfact & Detergents

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“…The choice of molecules used in this study is due to their atmospheric relevance and known surface activity. Stearic acid, as mentioned earlier, is one of the major surfactants found in atmospheric aerosols stemming from biogenic sources, and forms a floating monolayer (solubility in water of only 0.0029 g/kg) with well-known phase changes through induced surface pressure − Amino acids are also found in atmospheric aerosols, and are known to participate in atmospheric processes. − The mixed film formed by deposited stearic acid with adsorbed l -phenylalanine at the air–water interface was studied using the Langmuir trough in conjunction with Brewster angle microscopy (BAM) and infrared reflection–absorption spectroscopy (IRRAS).…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Collapse of a Stearic Acid Film by Adsorbed l-Phenylalanine at the Air–Water Interface

et al. 2012

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The surface morphology of atmospheric aerosol particles can influence the particle's overall effect on climate through enhancing or impeding its ability to uptake and evaporate water. In the work presented here, complementary surface-sensitive information from π-A isotherms, Brewster angle microscopy (BAM), and infrared reflection-absorption spectroscopy (IRRAS) are used to monitor the induced hydrophobic collapse of a surfactant film by an adsorbed amino acid at the air-water interface. The stearic acid film studied here is well-known to form a very stable floating monolayer at the air-water interface, and is shown in this work to withstand isotherm compression-expansion cycles without any premature collapse. With the presence of the water-soluble amino acid l-phenylalanine, however, significant disruption is observed of the stearic acid film, evidenced by the disappearance of its liquid-condensed phase from the isotherm cycles, as well as premature collapse structures observed in the BAM images and a change in intensity in stearic acid's C-H stretching region in the IRRAS spectra. Throughout this process, the surface layer is transformed from a homogeneous hydrophobic surface to an inhomogeneous surface with three-dimensional hydrophobic aggregates as well as hydrophilic "holes" with minimum surfactant coverage.

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Carboxylic Acids, Survey

Cited by 2 publications

References 51 publications

Dissolution Study of Salt of Long Chain Fatty Acids (Soap Scum) in Surfactant Solutions. Part I: Equilibrium Dissolution

Dissolution Study of Salt of Long Chain Fatty Acids (Soap Scum) in Surfactant Solutions. Part I: Equilibrium Dissolution

Hydrophobic Collapse of a Stearic Acid Film by Adsorbed l-Phenylalanine at the Air–Water Interface

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