Binary freezing point behavior of some normal octadecenoic acids

Mod, Robert R.; Harris, J. Arthur; Skau, Evald L.

doi:10.1021/je60036a034

Cited by 3 publications

(12 citation statements)

References 3 publications

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“…Oleic acid has two polymorphic solid phases, with transformation temperatures at 16.5 °C (a stable form) and 13.5 °C (a metastable form). 35 However, due to the supercooling effect, the observed crystallization point for oleic acid droplets can be lower than either of the thermodynamic transformation temperatures. Oleic acid droplets, which were placed on the Ge crystal within the ATR cell, were cooled progressively while the IR spectra were monitored as a function of temperature.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…35 Mod et al reported on a lower transformation temperature (13.5 °C) as the solid oleic acid sample is warmed. 35 Before reaching an apparent equilibrium at 13.5 °C, oleic acid has been observed to resolidify due to the formation of a higher-melting-point crystalline modification of oleic acid during the warming process. 35 In our case, the melting point is observed at ∼12 °C (Figure 5B), indicating that this solid oleic acid was in the metastable form.…”

Section: Effects Of the Thermodynamic Phase On The Oxidation Of Oleic...mentioning

confidence: 99%

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Effects of Temperature and Physical State on Heterogeneous Oxidation of Oleic Acid Droplets with Ozone

Hung

Tang

2010

J. Phys. Chem. A

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The heterogeneous reactions of pure micrometer-sized oleic acid droplets with ozone were studied as a function of temperature and physical state. Oxidation reactions were monitored using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FT-IR) and UV-vis spectrometry. Variations in droplet morphology due to the extent of oxidation were monitored using an optical microscope. Oleic acid droplets were maintained in either solid or liquid state at 9.0 °C. The physical state of the aerosol was determined from the IR absorbance spectra. Oxidation of solid state oleic acid with ozone at 9.0 °C was rapidly converted to the liquid state, which was most likely due to the presence of oxidation products on the surface of the droplets. The fast melting process that resulted from exposure of solid-phase droplets to ozone produced an oxidation rate similar to that for liquid-phase droplets exposed to ozone at the same temperature. Analysis of the carboxylic IR absorbance ratio for esters vs carboxylic acids indicates that the larger ester C═O-to-carboxylic acid C═O ratios at higher temperature appeared to correspond to the production of α-acyloxyalkyl hydroperoxide oligomers and polymers. The wide variation in product yields will result in vastly different physical properties of aerosol particles under different ambient environmental conditions.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Effects Of the Thermodynamic Phase On The Oxidation Of Oleic...mentioning

confidence: 99%

Effects of Temperature and Physical State on Heterogeneous Oxidation of Oleic Acid Droplets with Ozone

Hung

Tang

2010

J. Phys. Chem. A

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“…When the long spacings of these compounds are plotted vs. number of carbons, the three longer compounds fall squarely on a straight line (the C13 compound is slightly off the line) represented by eq 4. The calculated angle L = 2.40 + 6.60 (4) of tilt of these long-chain methyl ketones is therefore sin"1 2.40/2.54 = 70°53'.…”

Section: Resultsmentioning

confidence: 94%

“…Unless otherwise indicated, the compounds were prepared and purified by the procedures previously described for the amine salts (1), the acid-free amides (2), the N-substltuted amides (3), the octadecenoic acids (4), and the various amlnopyridlne salts (5,6). The A form of palmltamide was obtained by recrystalllzatlon of the B form from a dilute methanol solution.…”

Section: Methodsmentioning

confidence: 99%

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X-ray diffraction data for some amine salts of long-chain fatty acids and related compounds

Skau¹,

Mod²,

Mitcham³

1980

J. Chem. Eng. Data

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Dobry and Keller reported the vapor pressures of bicyclohexyl represented by the Clapeyron equation at the temperature range up to 240 °C, but values calculated from this equation are in serious disagreement with ours. AcknowledgmentWe acknowledge the leave of absence granted by the Institute of Physical Chemistry of the Polish Academy of Sciences, to the first author, Electric Power Research Institute, for providing the financial support of this investigation, and the Monsanto Chemical Company for providing the bath fluid, Thermlnol 88, gratis. Personal acknowledgments to Dr. Pervalz Nasir for helpful dlscussslons and R. J. Martin for extensive assistance with the experimental apparatus are due.

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Solid liquid phase diagrams of binary fatty acid mixtures—Palmitic/stearic with oleic/linoleic/linolenic acid mixture

et al. 2016

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Binary freezing point behavior of some normal octadecenoic acids

Cited by 3 publications

References 3 publications

Effects of Temperature and Physical State on Heterogeneous Oxidation of Oleic Acid Droplets with Ozone

Effects of Temperature and Physical State on Heterogeneous Oxidation of Oleic Acid Droplets with Ozone

X-ray diffraction data for some amine salts of long-chain fatty acids and related compounds

Solid liquid phase diagrams of binary fatty acid mixtures—Palmitic/stearic with oleic/linoleic/linolenic acid mixture

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