Phase Behavior and Effect of Enantiomerism on Potassium N -Dodecanoyl Alaninate/Water/Decanol Systems

Acharya, Durga P.; López‐Quintela, M. Arturo; Kunieda, H.; Oshimura, Eiko; Sakamoto, Kazutami

doi:10.5650/jos.52.407

Cited by 14 publications

(11 citation statements)

References 46 publications

(56 reference statements)

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“…4 obtained from Eq. (5) for rectangular aggregates are comparable to those observed for the same phase in other systems [15,16].…”

Section: The Phase Diagram Of the Cheo 15 /Nmea-12/ Water Systemsupporting

confidence: 86%

“…This change means that the separation between the aggregates along the (11) plane would decrease gradually with increasing W s . Similar microstructural changes are observed when NMEA-12 concentration (W ) is increased at a constant ChEO 15 :water ratio, as is shown in Table 1b.…”

Section: The Phase Diagram Of the Cheo 15 /Nmea-12/ Water Systemsupporting

confidence: 80%

“…The L α phase extends over a wide range of ChEO 15 concentrations from the water-NMEA-12 binary axis to the ChEO 15 -rich region. The L α phase of the water-NMEA-12 system significantly expands toward the dilute region upon addition of a very small amount of ChEO 15 . In the phase diagram, the H 1 , R 1 , and L α phases of the ChEO 15 /water system intrude into the water-rich region.…”

Section: The Phase Diagram Of the Cheo 15 /Nmea-12/ Water Systemmentioning

confidence: 99%

“…2 that with successive addition of surfactant or cosurfactant, the H 1 phase transforms into Table 1 Variation of unit cell dimension and aggregate size parameters of the R 1 phase in the ChEO 15 /NMEA-12/water system (a) with increasing weight fraction of total surfactant in the system, W s , at fixed ChEO 15 :NMEA-12 mixing ratio of 9:1 by weight and (b) with increasing weight fraction of NMEA-12 in the system, W , at fixed ChEO 15 the R 1 , which is attributed, as mentioned before, to the increase in the packing constraint in the lipophilic core, and consequently, decrease in interfacial curvature of the aggregate. Fig.…”

Section: H 1 -R 1 -L α Phase Transitionmentioning

confidence: 99%

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Phase behavior of poly(oxyethylene) cholesteryl ether/novel alkanolamide/water systems

Hossain

Acharya

Sakai

et al. 2004

Journal of Colloid and Interface Science

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“…4 obtained from Eq. (5) for rectangular aggregates are comparable to those observed for the same phase in other systems [15,16].…”

Section: The Phase Diagram Of the Cheo 15 /Nmea-12/ Water Systemsupporting

confidence: 86%

Section: The Phase Diagram Of the Cheo 15 /Nmea-12/ Water Systemsupporting

confidence: 80%

Section: The Phase Diagram Of the Cheo 15 /Nmea-12/ Water Systemmentioning

confidence: 99%

Section: H 1 -R 1 -L α Phase Transitionmentioning

confidence: 99%

See 2 more Smart Citations

Phase behavior of poly(oxyethylene) cholesteryl ether/novel alkanolamide/water systems

Hossain

Acharya

Sakai

et al. 2004

Journal of Colloid and Interface Science

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“…It was found that the chiral nematic phase coexists with 2D-hexagonal, 2D-rectangular ribbon, and lamellar phases in some lyotropic liquid-crystal systems. [30] Such coherence of the phase diagram promotes us to search the chiral phase corresponding to CMS in the lyotropic liquid-crystal system, which may be very important to understand the expression of chirality and to design new functional materials. It was also reported previously that the building units in nematic lyotropic liquid crystals are weakly anisometric micelles with disk-or rod-like shape.…”

mentioning

confidence: 99%

A 2D‐Rectangular p2gg Silica Mesoporous Crystal with Elliptical Mesopores: An Intermediate Phase of Chiral and Lamellar Mesostructures

et al. 2008

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Since the pioneering work of Kresge and co-workers, [1,2] much effort has been devoted to surfactant-templated mesoporous materials that display topologies closely related to those observed for lyotropic liquid crystals. Enhanced longrange order introduced by using both charged surfactants and controlling polymerization of the inorganic precursors benefits the further identification and characterization of their periodic mesostructures. So far, various mesophases with three-dimensional (3D) symmetry, such as orthorhombic (Pmmm [3] etc.), tetragonal (P4 2 /mnm, [4] P4/mmm [3] ), hexagonal (P6 3 /mmc [5] ), micellar cubic (Pm 3n, [6,7] Fd 3m, [8,9] Im 3m, [7,10] Fm 3m, [11] Pm 3m, [10] etc.), bicontinuous cubic (Ia 3d, [1,2] Pn 3m [12] ), two-dimensional (2D) symmetry, such as rectangular (c2mm [13] ) and hexagonal (p6mm [1,2,14] ), and onedimensional (1D) symmetry, such as lamellar, [1,2] have been discovered as mesoporous crystals in different synthesis systems. Very recently, chiral mesoporous silica (CMS), with a uniform twisted rodlike morphology and hexagonally ordered chiral channels, was also obtained by using chiral, [15] achiral anionic, [16] and achiral cationic [17][18][19] surfactants as the structure-directing agent. However, the formation mechanism, especially the structural relationship between the chiral and other mesostructures, including 2D-hexagonal, 2D-rectangular and lamellar structures, is less well understood because of the complication of the organic-inorganic co-assembling process and lack of information, such as the "synthesis-space diagram". Additionally, the synthesis of mesoporous crystals with controlled mesostructures is of great importance for fundamental research and development of new catalysts, adsorbents, drug delivery hosts, and nanoreactors. Within the range of liquid-crystal phases in surfactantwater systems, an "intermediate phase" has been used to represent those noncubic phases occurring at compositions between hexagonal and lamellar phases. [20][21][22] Ribbon phases are the intermediate phases that exhibit rodlike surfactant aggregates (micelles) with noncircular cross sections, arranged on a 2D-rectangular lattice. [20][21][22] There have been several reports on the structure of the ribbon phases, mainly suggesting they have the primitive-rectangular (plane group p2gg) and centered-rectangular (plane group c2mm) symmetry. [21,23] However, it is hard to make their small structural difference clear: X-ray scattering techniques give us very limited information about the structures. Using direct observation techniques, such as high-resolution transmission electron microscopy (HRTEM), we have found that a systematic structural change from 2D-hexagonal chiral to 2D-rectangular p2gg to lamellar mesostructure can be controlled by precisely adjusting the basicity of the reaction mixture. HRTEM gave direct evidence for the new particular 2D-rectangular p2gg mesostructural constructions with peculiar packing of elliptical mesopores arranged on a 2D-hexagonal lattice. These have ...

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2010

Self‐Organized Surfactant Structures

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Phase Behavior and Effect of Enantiomerism on Potassium N -Dodecanoyl Alaninate/Water/Decanol Systems

Cited by 14 publications

References 46 publications

Phase behavior of poly(oxyethylene) cholesteryl ether/novel alkanolamide/water systems

Phase behavior of poly(oxyethylene) cholesteryl ether/novel alkanolamide/water systems

A 2D‐Rectangular p2gg Silica Mesoporous Crystal with Elliptical Mesopores: An Intermediate Phase of Chiral and Lamellar Mesostructures

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