Thermodynamic properties of the normal alkanoic acids III. Enthalpies of vaporization and vapour pressures of 13 normal alkanoic acids

Kruif, C. G. de; Schaake, R.C.F.; Miltenburg, J.C. van; Klauw, K van der; Blok, J.G.

doi:10.1016/0021-9614(82)90176-8

Cited by 24 publications

(37 citation statements)

References 12 publications

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“…Previous studies have observed the formation of four major C 9 ozonolysis products (NL, NA, ON and AA) along with higher molecular weight products. The vapor pressures of NL, NA and AA have been determined experimentally as 44.28 Pa (at 297.1 K [ Verevkin et al , 2003]), 0.2 Pa (at 297.86 K [ de Kruif et al , 1982]) and 6.0 × 10 −6 Pa (at 296 K [ Bilde et al , 2003]), respectively. To our knowledge the vapor pressure of ON has not been experimental determined.…”

Section: Resultsmentioning

confidence: 99%

Oxidative aging of mixed oleic acid/sodium chloride aerosol particles

2012

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.[1] Studies of the oxidative aging of single mixed component aerosol particles formed from oleic acid (OL) and sodium chloride over a range of relative humidities (RH) and ozone concentrations by aerosol optical tweezers are reported. The rate of loss of OL and changes in the organic phase volume are directly measured, comparing particles with effloresced and deliquesced inorganic seeds. The kinetics of the OL loss are analyzed and the value of the reactive uptake coefficient of ozone by OL is compared to previous studies. The reaction of OL is accompanied by a decrease in the particle volume, consistent with the evaporation of semivolatile products over a time scale of tens of thousands of seconds. Measurements of the change in the organic phase volume allow the branching ratio to involatile components to be estimated; between 50 and 85% of the initial organic volume remains involatile, depending on ozone concentration. The refractive index (RI) of the organic phase increases during and after evaporation of volatile products, consistent with aging followed by a slow restructuring in particle morphology. The hygroscopicity of the particle and kinetics of the response of the organic phase to changes in RH are investigated. Both size and RI of unoxidized and oxidized particles respond promptly to RH changes with values of the RI consistent with linear mixing rules. Such studies of the simultaneous changes in composition and size of mixed component aerosol provide valuable data for benchmarking kinetic models of heterogeneous atmospheric aging.Citation: Dennis-Smither, B. J., R. E. H. Miles, and J. P. Reid (2012), Oxidative aging of mixed oleic acid/sodium chloride aerosol particles,

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Section: Resultsmentioning

confidence: 99%

Oxidative aging of mixed oleic acid/sodium chloride aerosol particles

2012

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“…The outcome shows how the vapor concentration achieved at 37°C, in the case of aldehydes, and even at 23°C, in the case of acids, should have been enough to produce detection of dodecanal, heptanoic acid, and larger homologs. Values of SVC for aldehydes and acids were taken from the literature (Riddick and Bunger, 1970, de Kruif et al, 1982, Stevenson and Malinowski, 1987, Verevkin et al, 2003 or, if unavailable, from a linear plot of SVC vs. carbon chain length for the particular homologous series.…”

Section: Discussionmentioning

confidence: 99%

Cutoff in detection of eye irritation from vapors of homologous carboxylic acids and aliphatic aldehydes

et al. 2007

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Using neat vapors of selected homologous aldehydes (decanal, undecanal, dodecanal) and carboxylic acids (pentanoic, hexanoic, heptanoic, octanoic, nonanoic), we explored the point where a certain homolog (and all larger ones) becomes undetectable by eye irritation (i.e., by ocular chemesthesis). This phenomenon has been observed in other homologous series that also reach a break-point, or cut-off, in chemesthetic detection. Participants (11≤n≤32) were tested using a three-alternative, forced-choice procedure. Flowrate to the eye equaled 4 or 8 L/min and time of exposure was 6 sec. The outcome showed that dodecanal and heptanoic acid were the shortest undetectable homologs. When the vapor concentration of the stimuli was increased by heating the liquid source to 37°C, homologs located before the cut-off point (e.g., hexanoic acid) became readily detected by all subjects, whereas homologs located at the cut off remained largely undetected. In addition, a comparison of calculated values of eye irritation thresholds for aldehydes and acids (from a successful model of ocular chemesthetic potency) with values of saturated vapor concentration at 23 and 37 °C indicated that the vapor concentration of dodecanal and heptanoic acid should have been enough to produce detection. The outcome suggests that the cut-off observed does not result from a low vapor concentration but from limitations in the structure or dimension(s) of the molecules that render them unsuitable to interact effectively with chemesthetic receptors.

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“…A previous study of multiple groups of PFASs (fluorotelomer alcohols, perfluoroalkanes) gave a 0.5 log unit decrease in liquid vapor pressure for each added CF 2 group. 31 Subcooled liquid vapor pressure data for other homologous compound groups at 298.15 K (n-alkanes, 32−34 n-alkanols, 35 alkanoic acids, 36,37 perfluoroalkanes, 38−40 and FTOHs 8 ) are presented in Figure 7a. Review articles were consulted when selecting the data for display.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…45 For fusion enthalpies Δ fus H, the values were measured at their fusion temperatures, including hexanol, heptanol, nonanol, undecanol, heptanoic acid, octanoic acid, nonanoic acid, undecanoic acid, perfluorohexane, perfluoroheptane, and perfluorooctane. 46−53 The vaporization enthalpy Δ vap H values for hexanol, heptanol, nonanol, undecanol, nonanoic acid, perfluorohexane, perfluoroheptane, and perfluorooctane are selected at or converted to 298.15 K. 36,40,42,54−57 The vaporization enthalpies of heptanoic acid, octanoic acid, and undecanoic acid are averaged values with a temperature close to or converted to 298.15 K. 36,37,58,59 Review articles were consulted when selecting the data. 60,61 The regression lines show that n-alkanes, n-alkanols, and nalkanoic acids all have similar slopes to that for the PFCAs, which suggests that CH 2 and CF 2 make the same contribution to increasing sublimation enthalpies for these groups of compounds.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Vapor Pressure of Nine Perfluoroalkyl Substances (PFASs) Determined Using the Knudsen Effusion Method

et al. 2020

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Sublimation vapor pressures of nine pure perfluoroalkyl substances, including ammonium perfluoro(2-methyl-3-oxahexanoate) (GenX), 1H,1H,2H,2H-perfluoro-1-decanol (8:2 FTOH), 1H,1H,2H,2H-perfluoro-1-dodecanol (10:2 FTOH), and C6 to C11 perfluorocarboxylic acids (PFCAs), were measured using the Knudsen technique at near-ambient temperatures. Melting temperatures and fusion enthalpies of these compounds were also measured by differential scanning calorimetry. The vapor pressure of GenX ammonium salt is comparable to that of the much higher molecular weight perfluoroundecanoic acid. GenX ammonium salt also did not show actual melting behavior but instead decomposed at around 470 K. The measured near-ambient temperature sublimation vapor pressures of the PFCAs and FTOHs were compared with some earlier reported liquid phase vapor pressures obtained at higher temperatures, and reasonable agreement exists between the data obtained in the different studies. The sublimation enthalpies of the PFCAs indicate that the contribution to the sublimation enthalpy of the CF2 group in the alkyl chain is comparable to that of the CH2 group in the corresponding nonfluorinated analogues, even though the PFCAs show consistently higher vapor pressures than do the corresponding carbon number alkanoic acids.

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Thermodynamic properties of the normal alkanoic acids III. Enthalpies of vaporization and vapour pressures of 13 normal alkanoic acids

Cited by 24 publications

References 12 publications

Oxidative aging of mixed oleic acid/sodium chloride aerosol particles

Oxidative aging of mixed oleic acid/sodium chloride aerosol particles

Cutoff in detection of eye irritation from vapors of homologous carboxylic acids and aliphatic aldehydes

Vapor Pressure of Nine Perfluoroalkyl Substances (PFASs) Determined Using the Knudsen Effusion Method

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