scholarly journals The Meaning of the Equilibrium Spreading Pressure of Fatty Acid Being Relatively Soluble in an Underlying Subphase

1989 ◽  
Vol 62 (3) ◽  
pp. 657-661 ◽  
Author(s):  
Makio Iwahashi ◽  
Kimiyo Iiduka ◽  
Takashi Watanabe ◽  
Tsutomu Seimiya
Keyword(s):  
Fatty Acid ◽  
Spreading Pressure ◽  
Equilibrium Spreading Pressure

scholarly journals The effect of fatty acid surfactants on the uptake of ozone to aqueous halogenide particles

2010 ◽  
Vol 10 (23) ◽  
pp. 11489-11500 ◽  
Author(s):  
A. Rouvière ◽  
M. Ammann
Keyword(s):  
Fatty Acid ◽  
Saturated Fatty Acids ◽  
Organic Films ◽  
Condensed State ◽  
Uptake Coefficient ◽  
Flow Tube ◽  
Spreading Pressure ◽  
Air Water Interface ◽  
Aqueous Surface ◽  
Equilibrium Spreading Pressure

Abstract. The reactive uptake of ozone to deliquesced potassium iodide aerosol particles coated with linear saturated fatty acids (C9, C12, C15, C18 and C20) was studied. The experiments were performed in an aerosol flow tube at 293 K and atmospheric pressure. The uptake coefficient on pure deliquesced KI aerosol was γ = (1.10±0.20)×10−2 at 72–75% relative humidity. In presence of organic coatings, the uptake coefficient decreased significantly for long straight chain surfactants (≥C15), while it was only slightly reduced for the short ones (C9, C12). We linked the kinetic results to the monolayer properties of the surfactants, and specifically to the expected phase state of the monolayer formed (liquid expanded or liquid condensed state). The results showed a decrease of the uptake coefficient by 30% for C12, 85% for C15 and 50% for C18 in presence of a monolayer of a fatty acid at the equilibrium spreading pressure at the air/water interface. The variation among C12, C15 and C18 follows the density of the monolayer at equilibrium spreading pressure, which is highest for the C15 fatty acid. We also investigated the effect of organic films to mixed deliquesced aerosol composed of a variable mixture of KI and NaCl, which allowed determining the resistance exerted to O3 at the aqueous surface by the two longer chained surfactants pentadecanoic acid (C15) and stearic acid (C18). For these, the probability that a molecule hitting the surface is actually transferred to the aqueous phase underneath was βC15=6.8×10−4 and βC18 = 3.3×10−4, respectively. Finally, the effect of two-component coatings, consisting of a mixture of long and short chained surfactants, was studied qualitatively.

RATE OF SPREADING AND EQUILIBRIUM SPREADING PRESSURE OF THE MONOLAYERS OF n-FATTY ALCOHOLS AND n-ALKOXY ETHANOLS

1962 ◽  
Vol 66 (7) ◽  
pp. 1361-1362 ◽  
Author(s):  
A. V. Deo ◽  
S. B. Kulkarni ◽  
M. K. Gharpurey ◽  
A. B. Biswas
Keyword(s):  
Fatty Alcohols ◽  
Spreading Pressure ◽  
Equilibrium Spreading Pressure

Water evaporation rates across hydrophobic acid monolayers at equilibrium spreading pressure

2008 ◽  
Vol 318 (2) ◽  
pp. 322-330 ◽  
Author(s):  
Minami Tsuji ◽  
Hiromichi Nakahara ◽  
Yoshikiyo Moroi ◽  
Osamu Shibata
Keyword(s):  
Water Evaporation ◽  
Spreading Pressure ◽  
Equilibrium Spreading Pressure

Spreading from Solid Hexadecanol

1963 ◽  
Vol 16 (1) ◽  
pp. 76 ◽  
Author(s):  
WW Mansfield
Keyword(s):  
Experimental Error ◽  
Water Surface ◽  
Spreading Pressure ◽  
Equilibrium Spreading Pressure

Within experimental error, the coefficient defining the rate of spreading from the edge of a crystal of hexadecanol into a water surface is constant up to the equilibrium spreading pressure. The corresponding coefficient for powdered hexade- can01 also remains constant. The equilibrium spreading pressure of the crystal edge is significantly less than that of powdered hexadecanol.

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