Effect of Ionic Surfactants on Nonionic Bilayers: Bending Elasticity of Weakly Charged Membranes

Schomaecker, R.; Strey, R.

doi:10.1021/j100065a055

Cited by 89 publications

(94 citation statements)

References 5 publications

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“…The reflection spectra of the equilibrated solutions after keeping the samples in water bath for 27 h exhibit sharp and narrow peaks, and do not noticeably change any more (see the Supporting [17] with the SDS concentration change. But in our system, the interplanar distance changes from 240 to 175 nm in the equilibrium state when the concentration of SDS changes from 1.09×10 -5 to 1.09×10 -3 mol/L.…”

Section: Color Change Of Dgi Solution With Different Concentrations Omentioning

confidence: 99%

“…Namely, the ionic charge of SDS molecules in a same membrane flattens the bilayers and thus leads to an increase in the surface area. The initial sharp decrease of interplanar distance in Figure 3 may be due to this mechanism [17][18][19] .…”

mentioning

confidence: 91%

“…For the lamellar bilayer membrane systems of a common nonionic surfactant C 12 E 5 , the periodic structure of bilayers is assumed to be stabilized by the Helfrich steric undulations [15][16][17] . Small amounts of ionic surfactants give a significant influence on the behavior of the dilute bilayer solutions of the nonionic agent [18] .…”

Section: Introductionmentioning

confidence: 99%

“…Taking the bilayer thickness δ and the volume fraction Ф to be 4 nm and 0.016, respectively, as a typical case in the normal nonionic iridescent systems, the blue shift in interplanar distance is about 20 nm [17,18] . This paper deals with an iridescent solution of a polymerizable nonionic surfactant, n-dodecyl glyceryl itaconate [DGI; n-C 12 H 25 OCOCH 2 C(=CH 2 )COOCH 2 CH(OH)CH 2 OH] [20] .…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the nonionic surfactant systems of C 12 E 5 do not need any ionic surfactants to have the swollen bilayers showing the iridescent color [16][17][18] , although this type of nonionic surfactant may contain ionic impurities, in some cases owing to the oxidation of the terminal -COH group to ionizable -COOH group [29] . In our DGI systems, it is found that ionic surfactants are necessary to change from the lamellar liquid crystalline droplets of pure DGI having the spacing distance of several nm to the iridescent lamellar phases.…”

mentioning

confidence: 99%

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Effect of ionic surfactants on the iridescent color in lamellar liquid crystalline phase of a nonionic surfactant

Chen

Mayama

Matsuo

et al. 2007

Journal of Colloid and Interface Science

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1A nonionic surfactant, n-dodecyl glyceryl itaconate (DGI), self-assembles into bilayer membranes in water having a spacing distance of sub-micrometer in the presence of small amounts of ionic surfactants, and shows beautiful iridescent color. Ionic surfactants have great effects on this iridescent system. We have interestingly found that the iridescent color changes with time after mixing DGI and ionic surfactants and the color in equilibrium state changes greatly with changing concentration of the ionic surfactants. The time dependent color change results from the transformation of DGI aggregate structure after being mixed with ionic surfactant. It is first found that the iridescent color of this nonionic system can be changed from red to deep blue by altering the concentration of ionic surfactants added even though the total concentration of surfactant is almost constant. Such large blue shift of the iridescent color in equilibrium state cannot be fully explained by the ordinary undulation theory applied so far for this phenomenon. The flat lamellar sheets tend to curve by increasing the concentration of ionic surfactants to form separated onion-like and/or myelin-like structures. These separated structures of lamellar system result in the decrease of spacing distance between bilayer membranes because some vacant spaces necessarily appear among these structures.

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Section: Color Change Of Dgi Solution With Different Concentrations Omentioning

confidence: 99%

mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Effect of ionic surfactants on the iridescent color in lamellar liquid crystalline phase of a nonionic surfactant

Chen

Mayama

Matsuo

et al. 2007

Journal of Colloid and Interface Science

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How Nano‐Ions Act Like Ionic Surfactants

et al. 2020

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Recently, nanometric ions were shown to adsorb to hydrated neutral surfaces and to bind to the cavities of macrocyclic molecules with an unexpectedly strong affinity arising from a solvent‐mediated effect named superchaotropicity. We show here that nano‐ions at low concentrations (μm range), similarly to anionic surfactants, induce the spontaneous transformation of a swollen lyotropic lamellar phase of non‐ionic surfactant into a vesicle phase. This transition occurs when the neutral lamellae acquire charges, either by adsorption of the nano‐ions onto, or by anchoring of the ionic surfactant into the lamellae. In contrast to ionic surfactants, nano‐ions strongly dehydrate the neutral surfactant assemblies. As a conclusion, these purely inorganic nanometric ions act as alternatives to the widely used organic ionic surfactants.

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