Generalization of  Theory for Estimation of Interfacial Energies

Good, Robert J.; Elbing, Enn

doi:10.1021/ie50723a009

Cited by 219 publications

(79 citation statements)

References 24 publications

(47 reference statements)

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“…This interfacial tension can be calculated in terms of the surface tensions g h and g w , respectively, of the hydrocarbon and water (i.e., liquid-air interfacial tensions) according to 42,44,45 …”

Section: Determination Of Cmcmentioning

confidence: 99%

The influence of poly(ethylene glycol) on the micelle formation of alkyl maltosides used in membrane protein crystallization

Müh

DiFiore

Zouni

2015

Phys. Chem. Chem. Phys.

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With the aim of better understanding the phase behavior of alkyl maltosides (n-alkyl-b-D-maltosides, C n G 2 ) under the conditions of membrane protein crystallization, we studied the influence of poly(ethylene glycol) (PEG) 2000, a commonly used precipitating agent, on the critical micelle concentration (CMC) of the alkyl maltosides by systematic variation of the number n of carbon atoms in the alkyl chain (n = 10, 11, and 12) and the concentration of PEG2000 (w) in a buffer suitable for the crystallization of cyanobacterial photosystem II. CMC measurements were based on established fluorescence techniques using pyrene and 8-anilinonaphthalene-1-sulfonate (ANS). We found an increase of the CMC with increasing PEG concentration according to ln(CMC/CMC 0 ) = k P w, where CMC 0 is the CMC in the absence of PEG and k P is a constant that we termed the ''polymer constant''. In parallel, we measured the influence of PEG2000 on the surface tension of detergent-free buffer solutions. At PEG concentrations w 4 1% w/v, the surface pressure p s (w) = g(0) À g(w) was found to depend linearly on the PEG concentration according to p s (w) = kw + p s (0), where g (0) is the surface tension in the absence of PEG. Based on a molecular thermodynamic modeling, CMC shifts and surface pressure due to PEG are related, and it is shown that k P = kc(n) + Z, where c(n) is a detergent-specific constant depending inter alia on the alkyl chain length n and Z is a correction for molarity. Thus, knowledge of the surface pressure in the absence of a detergent allows for the prediction of the CMC shift. The PEG effect on the CMC is discussed concerning its molecular origin and its implications for membrane protein solubilization and crystallization.

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Section: Determination Of Cmcmentioning

confidence: 99%

The influence of poly(ethylene glycol) on the micelle formation of alkyl maltosides used in membrane protein crystallization

Müh

DiFiore

Zouni

2015

Phys. Chem. Chem. Phys.

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“…[2] should organic liquid, and ethylene glycol-organic liquid systems (12,13), the f values were calculated from Eq. [2].…”

Section: Figmentioning

confidence: 99%

The Usefulness of the Equation of State for Interfacial Tensions Estimation in Some Liquid–Liquid and Solid–Liquid Systems

Jańczuk

Bruque

González-Martı́n

et al. 1996

Journal of Colloid and Interface Science

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“…From the measured OG and 0o values and the literature values for 3'D, "r~, and 3'B (Panzer, 1973;d n (Good andBia~opiotrowicz, 1989), and3'o, 3'o, and"to Elbing, 1970;Jaficzuk et al, 1989a) (Table 2), the dispersive and nondispersive components of the kaolin/ DDAC1 surface were calculated from Eqs. (3-5).…”

Section: Resultsmentioning

confidence: 99%

Influence of Dodecylamine Chloride on the Surface Free Energy of Kaolinite

Jańczuk

Chibowski

Białopiotrowicz

et al. 1990

Clays and clay miner.

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Abstract--Contact angles of glycerol and diiodomethane drops were measured on the surface of kaolin pellets covered with different amounts of dodecylamine chloride (DDAC1) to as much as one monolayer. For a glycerol drop, the contact angle changed from 25.7* (bare surface) to 45.4 ~ for the surface precoated with 0.125 monolayer of DDAC1, but remained nearly constant above this level up to one monolayer. For a diiodomethane drop, the contact angle changed from 28.6* (bare surface) to 58.1" for one DDAC1 monolayer precoating. Using these contact angles and a modified Young equation, the dispersive and nondispersive components of the surface free energy of DDACl-covered kaolin were calculated. These data showed that in the extreme case (one monolayer) the dispersive component was reduced by the DDACI from ~36 mJ/m 2 (bare surface) to 25.4 mJ/m 2, i.e., the value characteristic for paraffin (25.5 m J/mE); however, the nondispersive component was not reduced to zero. A minimum value (15.83 m J/ m 2) was determined for the sample covered with 0.125 DDAC1 monolayer (calculated), and a slight increase in the nondispersive component was observed for greater coverages. Such a change of the nondispersive component suggests that, at higher coverages, some adsorbed DDAC1 molecules were oriented with their polar ends off the surface. Based on the values of the .yaf and 3'~f, the work of water spreading was calculated. This work was positive for the bare surface (32.8 mJ/m 2) and methanoltreated (36.5 mJ/m 2) kaolin surface, but negative for 0.125 DDACI monolayer precoating (-31.1 mJ/ m2). It remained essentially unchanged for higher coverages. These data mean that bare and methanoltreated kaolinite surfaces were hydrophilic and that DDACl-treated surfaces were hydrophobic.

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Generalization of Theory for Estimation of Interfacial Energies

Cited by 219 publications

References 24 publications

The influence of poly(ethylene glycol) on the micelle formation of alkyl maltosides used in membrane protein crystallization

The influence of poly(ethylene glycol) on the micelle formation of alkyl maltosides used in membrane protein crystallization

The Usefulness of the Equation of State for Interfacial Tensions Estimation in Some Liquid–Liquid and Solid–Liquid Systems

Influence of Dodecylamine Chloride on the Surface Free Energy of Kaolinite

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