Thickness transitions in lysolecithin foam films

Cohen, R.; Exerowa, D.; Kolarov, T.; Yamanaka, Teruko; Müller, Veronika

doi:10.1016/0166-6622(92)80275-7

Cited by 33 publications

(27 citation statements)

References 25 publications

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“…The fluctuations of h in the metastable region can be related to the low barrier in the disjoining pressure isotherm. Such effect has been observed during previous studies of microscopic foam films formed from non-ionic surfactants (Cohen et al 1992;Todorov et al 2007). Another explanation of this effect could be that the BSA absolute charge is decreased due to small change in structural conformation and rearrangement of protein molecules at the interface during adsorption.…”

Section: Stability Of the Foams Formedmentioning

confidence: 61%

“…This cell is particularly advantageous for determining the ranges of action of long-range and short-range surface forces and the transition between them, as well as the existence of the so-called "metastable" films, i.e. simultaneous co-existence of both thick films and black films (Exerowa and Kruglyakov 1998;Platikanov and Exerowa 2005;Cohen et al 1992). In order to maintain equilibrium conditions in the cell, concerning temperature (T = 22 • C) and vapor pressure, the measurements were performed at least two hours after the tightly closed cell was mounted on the microscope.…”

Section: Methodsmentioning

confidence: 99%

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Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

et al. 2010

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Influence of pH of the BSA solutions on velocity of the rising bubbles, stability of foams, and properties of single foam and wetting films was studied. It was found that the solution pH affected significantly the BSA surface activity and properties of the protein adsorption layer under dynamic and static conditions. At pH close to the isoelectric point (pH IEP = 4.8) the BSA showed the highest surface activity. The equilibrium microscopic foam films of thicknesses of 64-80 nm, depending on the BSA concentration, were obtained at pH = 5.8. Under dynamic conditions the bubble rising velocity was reduced in a highest degree and the foam formed were most stable at the solutions pH-5.8 and 4.8. Lowering the bubble velocity shows that the BSA adsorption layer was formed, which retarded fluidity of the bubble surface. When the solution pH was significantly lower (pH = 3.9) or much higher (pH = 10) than the pH IEP then the BSA practically had no influence on the bubble velocity and the foam stability was drastically reduced. Moreover, the pH variations affected also the time of the threephase contact (TPC) formation on mica surface covered by the BSA adsorption layers. These pH dependent changes in the BSA surface activity indicate that the BSA linear conformers, existing at pH far away from the pH IEP , have much higher affinity to aqueous phase resulting from higher net electrical charge present over the extended BSA molecule conformers.

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Section: Stability Of the Foams Formedmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

et al. 2010

Self Cite

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“…[9][10][11][12][13][14][15][16][17]. Effect of the charge number of inorganic ion on the miscibility of and the interaction between inorganic salt and octyl methyl sulfoxide (abbreviated as OMS) in adsorbed films and micelles are investigated in this paper.…”

Section: Introductionmentioning

confidence: 99%

Charge number effect on the miscibility of inorganic salt and surfactant in adsorbed film and micelle: Inorganic salt–octyl methyl sulfoxide mixtures

Iyota¹,

Tomimitsu²,

Shimada³

et al. 2006

Journal of Colloid and Interface Science

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“…Just 15 years ago, formation of a black lipid film in air stabilized by double-chained phospholipids was reported for the first time. , After that, the nature of the black lipid film composed of insoluble surface-active agents such as fatty acids, alkanols, lysophospholipids, − and especially double-chained phospholipids − has widely been studied. The reasons that black lipid films in air stabilized by phospholipids have been extensively studied are as follows.…”

Section: Introductionmentioning

confidence: 99%

Fourier Transform Infrared Spectra and Molecular Orientation of Black Lipid Films in Air Interacting with Metal Ions

Tano

Umemura

1997

Langmuir

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Polarized Fourier transform infrared spectra of black lipid films in air withdrawn from aqueous dispersions of dimyristoylphosphatidylcholine (DMPC) have been recorded at various electrolyte concentrations. The spectra revealed that monovalent cations gave little effect, whereas polyvalent cations except Mg2+ gave remarkable effects on vibrational wavenumbers of both the acyl chain and phosphate ester group of DMPC in black lipid films. In the case of Mg2+, the effect was discerned only for the phosphate ester group. By use of thin film optics, molecular orientation of DMPC in the black lipid film in air was quantitatively evaluated as a function of electrolyte concentration. In the case of monovalent and Mg2+ cations, the orientation angle of the acyl chain axes from the surface normal was little affected by the electrolyte addition. On the other hand, the other polyvalent cations caused decrease of the average orientation angle from ca. 40° to 30°. The affinity of the cations for the DMPC lipid films in air are in the order of Zn2+ > La3+ ∼ Ca2+ ∼ Pb2+ > Mg2+ > Na+ ∼ Li+.

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Thickness transitions in lysolecithin foam films

Cited by 33 publications

References 25 publications

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

Charge number effect on the miscibility of inorganic salt and surfactant in adsorbed film and micelle: Inorganic salt–octyl methyl sulfoxide mixtures

Fourier Transform Infrared Spectra and Molecular Orientation of Black Lipid Films in Air Interacting with Metal Ions

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