Spreading from Solid Hexadecanol

Mansfield, W. W.

doi:10.1071/ch9630076

Cited by 11 publications

(5 citation statements)

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“…Some lipids spread on an aqueous surface from the solid state without the aid of a spreading solvent [ Cary and Rideal , 1925a, 1925b; Mansfield , 1959, 1962; Deo et al , 1962, 1964; Gaines , 1966; Iwahashi et al , 1985; Fang and Joos , 1992]. When placed at the aqueous‐air interface, lipid molecules break off from the solid phase and disperse on the solution surface.…”

Section: Introductionmentioning

confidence: 99%

“…Spreading rates from solid lipids are reported in relatively few studies and are slow when compared to spreading rates of liquid lipids [ Gaines , 1966 and references therein; Fang and Joos , 1992]. Additionally, spreading rates of fatty alcohols are better quantified than fatty acids [ Cary and Rideal , 1925a, 1925b; Mansfield , 1959, 1962; Deo et al , 1962, 1964; Gaines , 1966; Fang and Joos , 1992].…”

Section: Introductionmentioning

confidence: 99%

“…The spreading rate was then calculated using previously determined area per molecule values for the lipid monolayer at a given surface pressure. Spreading rates have been reported as the number of molecules spreading from 1 cm of solid‐aqueous‐air boundary or “triple interface perimeter” per second (molecules cm −1 s −1 ) [ Mansfield , 1959, 1962; Deo et al , 1962, 1964; Gaines , 1966; Fang and Joos , 1992]. Spreading rates have been shown to decrease with increasing chain length for a given homologous series and with decreasing temperature [ Cary and Rideal , 1925a, 1925b; Deo et al , 1962, 1964; Fang and Joos , 1992].…”

Section: Introductionmentioning

confidence: 99%

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Rate of organic film formation and oxidation on aqueous drops

Aumann

Tabazadeh

2008

J. Geophys. Res.

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[1] Previous studies suggest that saturated fatty acids or other lipids, which are known to be strong film-forming agents, form condensed films on aqueous drops. Specifically, stearic acid (SA) has been used in laboratory and modeling studies to mimic the surface composition of some particles in the atmosphere. In this study, laboratory measurements were used to determine the rate of SA spreading from a solid on aqueous surfaces, ranging in composition from ammonium sulfate to highly acidic sulfuric acid. Maximum spreading rates were measured on neutral electrolyte solutions, while spreading was not observed on aqueous sulfuric and hydrochloric acids (pH < 0). Also, the spreading rates on water and electrolyte surfaces declined sharply as the solution pH was lowered from 7 to 3. Spreading rates are reported with a dependence on the length of solid-aqueous-air boundary (triple interface perimeter). Spreading rates measured on bulk solutions were modeled on atmospheric particles to determine the time constant of organic film formation on aqueous drops. The time required for a saturated fatty acid to spread and coat a submicron salt particle or a cloud drop is on the order of seconds to minutes or minutes to hours, respectively. In conclusion, lipid coatings can form quickly on neutral or slightly acidic salt drops if a sufficient amount of lipid is present in the drop and the lipid is in direct contact with the aqueous solution surface. Rapid film formation and fast heterogeneous oxidation can provide an efficient way of converting water-insoluble organic films into more water-soluble components in aerosols or cloud drops.Citation: Aumann, E., and A. Tabazadeh (2008), Rate of organic film formation and oxidation on aqueous drops,

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rate of organic film formation and oxidation on aqueous drops

Aumann

Tabazadeh

2008

J. Geophys. Res.

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“…The disc assembly weighs 10 g. The input for the transducer may be obtained from a stabilised DC power supply or from a 4V lead-acid accumulator. The transducer output is recorded by a millivolt recorder, the circuit diagram given by Mansfield (1963) being a useful means of balancing the no-load output of the gauge. Two quantities may be obtained from the recorder trace of the transducer output:…”

Section: Apparatusmentioning

confidence: 99%

Bloat in cattle

Laby¹

1969

New Zealand Journal of Agricultural Research

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ABSTRACf Four quantities which assist in characterising persistent strong foams produced from proteins, plant extracts, or rumcn liquor are described. Two are derived from foam drainage data by applying the second order relation dv = k2 (voo-v)2. They are drainage constant, k 2 , and foam dt retention volume, Vo-Voo. The remaining two quantities are physic .. l properties determined by the effect of the foam on a sensing disc connected to a strain gauge. They are compressive strength and stress relaxation. The reproducibility and variation of these quantities within a range of experimental conditions are given, and their possible interdependence and relationship to foam persistence are considered.

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“…The transducer, supplied with a 4-volt power source, was balanced by the circuit of Mansfield (1963), and its output connected to a millivolt recorder.…”

Section: (D) Foaming Studiesmentioning

confidence: 99%

Bloat in cattle

Jones

Lyttleton²

1969

New Zealand Journal of Agricultural Research

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ABSTRACfLeaf proteins from white clover have been separated into the two classes Fraction I and Fraction II, and the composition of each established by gel electrophoresis and analytical ultracentrifugation. Fractions I and II both produced strong foams over the pH range which exists in the rumen when bloat occurs.Foam production at pH 5.8 has been shown to cause surface denaturation of both Fraction I and Fraction II proteins in extracts from both white and red clover.

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Spreading from Solid Hexadecanol

Cited by 11 publications

References 0 publications

Rate of organic film formation and oxidation on aqueous drops

Rate of organic film formation and oxidation on aqueous drops

Bloat in cattle

Bloat in cattle

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