Salt-induced Morphology Transition of a Micelle Formed of a Calix[4]arene-Derivative Cationic Surfactant in Aqueous Solution

Matsumoto, Sakiko; Takahashi, Rintaro; Yamada, Shimpei; Fujii, Shota; Sakurai, Kazuo

doi:10.1246/cl.170032

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…In recent years, we designed various calix [4]arene-based surfactants to make micelles (Figure 1). [17][18][19][20][21][22][23][24][25][26][27][28] Various calix [4]arenebased surfactants were self-assembled to micelle structures, which showed monodisperses in aqueous solutions. Interestingly, the aggregation numbers were 4, 6, 8, 12, or 20.…”

Section: Platonic Micelles and Their Coverage Theorymentioning

confidence: 99%

Monodisperse Micelles with Aggregation Numbers Related to Platonic Solids

Lee

Fujii

Takahashi

et al. 2020

Macromol. Rapid Commun.

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Recent studies show that calix[4]arene‐based micelles are monodisperse with defined Nagg values chosen from 4, 6, 8, 12, 20, and 32. Interestingly, all these numbers coincide with the face numbers of Platonic solids, so they are called “Platonic micelles.” As long as a certain geometric condition is fulfilled, any amphiphilic molecule can form a Platonic micelle. The preferred Nagg values are explained in relation to the mathematical Tammes problem, namely, how to obtain the best coverage of a sphere's surface with multiple identical circles. The coverage ratio can be calculated and produces maxima at 4, 6, 12, 20, and 32, coinciding with the observed Nagg values. In this feature article, Platonic micelles as well as their morphological transition by controlling pH, salt, temperature, and electrostatic interactions are summarized.

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Section: Platonic Micelles and Their Coverage Theorymentioning

confidence: 99%

Monodisperse Micelles with Aggregation Numbers Related to Platonic Solids

Lee

Fujii

Takahashi

et al. 2020

Macromol. Rapid Commun.

Self Cite

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“…We recently found that calix[4]arene‐derived surfactants form spherical micelles with a defined, monodisperse N agg value of 4, 6, 8, 12, or 20, corresponding to the Platonic solids. We thus refer to these as Platonic micelles.…”

Section: Figurementioning

confidence: 99%

Monitoring the Discontinuous Dodecamer–Icosamer Transition of a Calix[4]arene‐Derived Surfactant by Time‐Resolved Small‐Angle X‐ray Scattering

et al. 2017

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Calix[4]arene‐derived surfactants form monodisperse micelles with a well‐defined aggregation number (Nagg) of 4, 6, 8, 12, or 20, corresponding to the Platonic solids. This feature is in strong contrast to conventional micelles. In this study, a transition from a dodecamer (Nagg=12) to an icosamer (Nagg=20) was induced by a rapid increase in the NaCl concentration (CNaCl) using a stopped‐flow device and directly observed by time‐resolved small‐angle X‐ray scattering. The Nagg remained unchanged during the first 60 s after the increase in CNaCl , and then abruptly increased to 20. This feature resembles phase transitions in supersaturated or supercooled states, or highly cooperative phenomena. We surmise that this finding may be due to the fact that only a few Nagg values are thermodynamically allowed when Nagg is sufficiently small. This is the first observation of such an induction time in micellar aggregation.

show abstract

Monitoring the Discontinuous Dodecamer–Icosamer Transition of a Calix[4]arene‐Derived Surfactant by Time‐Resolved Small‐Angle X‐ray Scattering

et al. 2017

View full text Add to dashboard Cite

Calix[4]arene-derived surfactants form monodisperse micelles with a well-defined aggregation number (N ) of 4, 6, 8, 12, or 20, corresponding to the Platonic solids. This feature is in strong contrast to conventional micelles. In this study, a transition from a dodecamer (N =12) to an icosamer (N =20) was induced by a rapid increase in the NaCl concentration (C ) using a stopped-flow device and directly observed by time-resolved small-angle X-ray scattering. The N remained unchanged during the first 60 s after the increase in C , and then abruptly increased to 20. This feature resembles phase transitions in supersaturated or supercooled states, or highly cooperative phenomena. We surmise that this finding may be due to the fact that only a few N values are thermodynamically allowed when N is sufficiently small. This is the first observation of such an induction time in micellar aggregation.

show abstract

Salt-induced Morphology Transition of a Micelle Formed of a Calix[4]arene-Derivative Cationic Surfactant in Aqueous Solution

Cited by 4 publications

References 15 publications

Monodisperse Micelles with Aggregation Numbers Related to Platonic Solids

Monodisperse Micelles with Aggregation Numbers Related to Platonic Solids

Monitoring the Discontinuous Dodecamer–Icosamer Transition of a Calix[4]arene‐Derived Surfactant by Time‐Resolved Small‐Angle X‐ray Scattering

Monitoring the Discontinuous Dodecamer–Icosamer Transition of a Calix[4]arene‐Derived Surfactant by Time‐Resolved Small‐Angle X‐ray Scattering

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