Confrontation of energetic changes in sulfur/n-alkane-water and sulfur/n-alkane-vapor systems

Chibowski, Emil; Biliński, Bogdan; Waksmundzki, Andrzej; Wójcik, Wiesław

doi:10.1016/0021-9797(82)90099-6

Cited by 36 publications

(10 citation statements)

References 9 publications

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“…Thus obtained values seem to be reasonable and they are lower than those determined previously [22][23][24][25][26][27].…”

Section: Discussioncontrasting

confidence: 70%

“…If one would like to consider that the measured advancing contact angles are due to the dispersion interactions only, then the thus calculated surface free energy would be between 58 mJ/m 2 (for yellow sulfur crystallized in air) to 116.3 mJ/m 2 (for orange sample crystallized at the silicon surface), that is, in the range determined previously [22][23][24][25][26][27]. However, from contact angles of diiodomethane, which can be assumed to interact by dispersion forces only, the sulfur surface free energy thus obtained is only about 45-50 mJ/m 2 [14].…”

Section: Discussionmentioning

confidence: 98%

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Surface free energy of sulfur—Revisited

Terpiłowski

Hołysz

Chibowski

2008

Journal of Colloid and Interface Science

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“…Thus obtained values seem to be reasonable and they are lower than those determined previously [22][23][24][25][26][27].…”

Section: Discussioncontrasting

confidence: 70%

Section: Discussionmentioning

confidence: 98%

Surface free energy of sulfur—Revisited

Terpiłowski

Hołysz

Chibowski

2008

Journal of Colloid and Interface Science

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“…Although Equation 11 has not been derived theoretically, we found that it worked in many systems. A comparison of the results obtained by other methods (adsorption [18], contact angles [14,15], and ellipsometry [20]) support the usefulness of the method.…”

Section: Introductionsupporting

confidence: 60%

Influence of tetradecylamine chloride on the surface free-energy components and flotability of barite

Chibowski

Hołysz

1992

J Mater Sci

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The concept presented by van Oss et aL of the surface free-energy components: apolar, (Lifshitz-van der Waals LW), and polar (electron donor/electron accepter SR) is used in a model system: barite/tetradecylamine chloride (TDACI)-water. The components have been determined for bare, 0.25, and 1,0 TDACI covered barite surfaces. The values were obtained from glycerol (or water) contact angles and by using a method in which zeta potentials were measured for a series of barite/TDACI/n-hexane (n-hexanol) film samples in water. From the determined surface free-energy components, the values of AG for particular samples were calculated. Negative AG is the thermodynamic condition for effective flotation. This condition states that the work of water adhesion to the surface must be less than the work of water cohesion. Full agreement between the flotation activity of the samples and the AG magnitude was found. We conclude that experimentally determined components are useful quantities for explaining some interfacial phenomena.

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“…According to Harkins (1952), the film pressure resulting from adsorption equilibrium is equal to the work of spreading wetting. From previous studies (Jaficzuk et al, 1983;Chibowski et aL, 1982;Chibowski et al, 1986;Staszczuk, 1984) the maximum value in some systems may equal the work of adhesion. In the system examined here, however, the amount of n-octane adsorbed corresponds to only one statistical monolayer; therefore, it is very probable that only the spreading wetting process takes place here.…”

Section: Resultsmentioning

confidence: 95%

Determination of Surface Free Energy of Kaolinite

Chibowski

Staszczuk

1988

Clays and clay miner.

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Abstract--The adsorption of n-octane and water vapor on natural kaolinite was measured. From adsorption isotherms film pressures were determined which were then used to calculate the dispersion and nondispersion components of the kaolinite surface free energy. In addition, thermodesorption of water from the kaolinite surface was determined. These results suggest that physically adsorbed water remained on the kaolinite surface, even at temperatures as great as 125"(2. Therefore, experimentally determined dispersion and nondispersion components appear to relate to the surface precovered with a film of water. These values are: ~gw) = 34.4 mJ/m 2 for dispersion interactions and ~gw) = 60.2 mJ/m 2 for nondispersion interactions. Assuming a kaolinite surface precovered with a film of water, which decreased the free energy by the work of spreading, the following components of the energy for the bare surface were calculated: ~s = 67.6 mJ/m 2 and 3'~ = 103.4 mJ/m 2, for dispersion and nondispersion components, respectively. Key Words--Adsorption, Film pressure, Free energy, Kaolinite, n-Octane, Surface, Water.Abstrakt --Zmierzono adsorpcje pary wodnej i n-oktanu na naturalnymkaolinicie. Z uzyskanych izoterm adsorpcji wyznaczono cignienia film6w i nastgpnie skladow~ dyspersyjn~ i niedyspersyjn~ swobodnej energii powierzchniowej kaolinitu. Pr6cz tego, zbadano tak2e termodesorpcj~ wody z powierzchni kaolinitu. Z tych do~wiadczefi wynika, ~e woda zaadsorbowana fizycznie pozostaje na powierzchni kaolinitu nawet do 125~ Dlatego, sugeruje si~, ~e wyznaczona do~wiadczalnie skladowa dyspersyjna i niedyspersyjna dotyczy powierzchni pokrytej filmem wody. Wyznaczone warto~ci wynosz~: ~gw) = 34.4 mJ/m 2 dla oddzialywafi dyspersyjnych i "Y~w) = 60.2 rnJ/m 2 dla oddziatywafi niedyspersyjnych. Przyjmuj0c model, w kt6rym film wody na powierzchni kaolinitu obni~a jego swobodm~ energi~ o pracg rozptywania, wyliczono skfadowe tej energii dla czystej powierzchni kaolinitu. Sk~adowe te wynosz~: ~ = 67.6 rnJ/m 2 i "r~ = 103.4 mJ/m 2.

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Confrontation of energetic changes in sulfur/n-alkane-water and sulfur/n-alkane-vapor systems

Cited by 36 publications

References 9 publications

Surface free energy of sulfur—Revisited

Surface free energy of sulfur—Revisited

Influence of tetradecylamine chloride on the surface free-energy components and flotability of barite

Determination of Surface Free Energy of Kaolinite

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