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Nagai, Masayoshi; Onishi, M.

doi:10.5107/sccj.18.19

Cited by 9 publications

(5 citation statements)

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“…There have been reported so far more than 10 surfactant systems which show the iridescent phenomena. 12,[15][16][17][18][19][20][21][22][23][24][25][26] The color, however, can be changed only by the surfactant concentration in most of the systems with only one exception. 15 The iridescent material controlled by the swelling degree of the gel is, of course, first synthesized and characterized in this work.…”

Section: Discussionmentioning

confidence: 99%

A Novel Hybrid Material of Polymer Gels and Bilayer Membranes

et al. 1997

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Responsive polymer gels that contain bilayer membranes have been synthesized and characterized as a novel hybrid material. The hybrid gels show some unique properties which cannot be obtained from the individual polymer gels and the bilayer membranes. Iridescent color resulting from the Bragg diffraction of visible light by the periodic structure of bilayer membranes can be changed by controlling the swelling degree of the gel. Introduction of bilayer membranes strongly affects the volume phase transition behavior of the gel. By the polymerization of a gel while shear flow is imposed upon the solution to be gelled, an anisotropic gel has been synthesized. The hybrid gels show more than a seven times larger elastic modulus and can be extended more than three times before fracture than the simple polymer gel.

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Section: Discussionmentioning

confidence: 99%

A Novel Hybrid Material of Polymer Gels and Bilayer Membranes

et al. 1997

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“…Among them, the highly swollen lamellar phases have been well studied in the past years [2][3][4][5] . The spacing distance between these bilayer membranes in the swollen lamellar phases can extend to hundreds of nanometers and the solutions show iridescent color [6][7][8][9] . The iridescent surfactant systems studied so far cover anionic, cationic and nonionic surfactants [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

“…The iridescent surfactant systems studied so far cover anionic, cationic and nonionic surfactants [10][11][12][13][14] . It is well known that this iridescent color can be changed by changing the total concentration of surfactants [6][7][8][9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

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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“…One of the most interesting recent topics in the field of colloid and surface science − is the iridescent phenomena of some surfactants and surfactant mixtures in dilute (1−2 wt %) aqueous solutions. The iridescent color appears by Bragg reflection of visible light from the periodic lamellar structure of bilayer membranes having a spacing distance of a submicrometer .…”

Section: Introductionmentioning

confidence: 99%

A Novel Iridescent Gel Phase of Surfactant and Order−Disorder Phase Separation Phenomena

et al. 1996

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A novel iridescent gel phase of surfactant has been found in a ternary mixture of a double-chain surfactant (triethanolammonium dihexadecylphosphate), water, and ethanol. The structure of the iridescent gel phase has been studied mainly by X-ray diffraction and ultraviolet and visible light reflection techniques and determined to be lamellar, having the spacing distance of a submicrometer. The color appearance of the solutions results from diffraction of visible light by the lamellar structure of bilayer membranes. It is particularly interesting to note in this system that the iridescent color can be changed with temperature (0−20 °C), ethanol concentration (15−48 wt %), and surfactant concentration (1.0−2.0 wt %) as well. The iridescent color begins to shift to the blue side at a certain critical temperature when the temperature is elevated. Turbidity of the solution also starts to increase at the same critical temperature. When these critical temperatures are connected as a function of surfactant concentration, a curve similar to that of the lower critical solution temperature type phase diagram is obtained. In the two-phase region of this diagram, the iridescent color changes with temperature, owing to the concentration change of the condensed (lamellar) phase, and does not change at constant temperature even when the surfactant concentration is altered. These novel phenomena in the present iridescent surfactant systems can be ascribed to the phase separation into a lamellar structure and disordered bilayers of the surfactant gel phase. This order−disorder phase transition is substantiated by the freeze−fracture electron microscopic technique. This new type of phase separation phenomenon gives us a challenging fundamental problem on the interactions between colloidal particles.

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Cited by 9 publications

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A Novel Hybrid Material of Polymer Gels and Bilayer Membranes

A Novel Hybrid Material of Polymer Gels and Bilayer Membranes

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

A Novel Iridescent Gel Phase of Surfactant and Order−Disorder Phase Separation Phenomena

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