Aggregation behavior of mixed fluorocarbon and hydrocarbon surfactants in aqueous solutions

Muto, Yasushi; Esumi, Kunio; Meguro, Kenjiro; Zana, R.

doi:10.1016/0021-9797(87)90335-3

Cited by 102 publications

(67 citation statements)

References 47 publications

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“…Fluorocarbon surfactants are stable and widely used at high temperatures (> 200 8C). However, due to the rigidity and strong hydrophobicity of the fluorocarbon chains, [13] fluorocarbon surfactants are not suitable as templates for the preparation of well-ordered mesoporous materials.…”

Section: Introductionmentioning

confidence: 99%

“…This may be attributed to the fact that the fluorocarbon surfactant tends to assemble into small-sized micelles, instead of periodic long-range ordered micelles, due to the rigidity and strong hydrophobicity of the fluorocarbon chain. [13] The complete silica condensation and high thermal, hydrothermal, and mechanical stabilities of JLU-20 should be attributed directly to the high synthesis temperature rather than other reasons, such as the presence of fluorocarbon surfactant. If JLU-20 is prepared at 100 8C instead of at 190 8C, it shows no difference in both structural properties (such as surface area, pore volume, Q 4 /Q 3 ratio, Table 1) and stabilities with conventional SBA-15, although FC-4 is used.…”

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confidence: 98%

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High‐Temperature Synthesis of Stable Ordered Mesoporous Silica Materials by Using Fluorocarbon–Hydrocarbon Surfactant Mixtures

Han

Song

et al. 2004

Chemistry A European J

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Highly ordered hexagonal mesoporous silica materials (JLU-20) with uniform pore sizes have been successfully synthesized at high temperature (150-220 degrees C) by using fluorocarbon-hydrocarbon surfactant mixtures. The fluorocarbon-hydrocarbon surfactant mixtures combine the advantages of both stable fluorocarbon surfactants and ordered hydrocarbon surfactants, giving ordered and stable mixed micelles at high temperature (150-220 degrees C). Mesoporous JLU-20 shows extraordinary stability towards hydrothermal treatment (100 % steam at 800 degrees C for 2 h or boiling water for 80 h), thermal treatment (calcination at 1000 degrees C for 4 h), and toward mechanical treatment (compressed at 740 MPa). Transmission electron microscopy images of JLU-20 show well-ordered hexagonal arrays of mesopores with one-dimensional (1D) channels and further confirm that JLU-20 has a two-dimensional (2D) hexagonal (P6 mm) mesostructure. 29Si HR MAS NMR spectra of as-synthesized JLU-20 shows that JLU-20 is primarily made up of fully condensed Q4 silica units (delta=-112 ppm) with a small contribution from incompletely cross-linked Q3 (delta=-102 ppm) as deduced from the very high Q4/Q3 ratio of 6.5, indicating that the mesoporous walls of JLU-20 are fully condensed. Such unique structural features should be directly attributed to the high-temperature synthesis, which is responsible for the observed high thermal, hydrothermal, and mechanical stability of the mesoporous silica materials with well-ordered hexagonal symmetry. Furthermore, the concept of "high-temperature synthesis" is successfully extended to the preparation of three-dimensional (3D) cubic mesoporous silica materials by the assistance of a fluorocarbon surfactant as a co-template. The obtained material, designated JLU-21, has a well-ordered cubic Im3m mesostructure with fully condensed pore walls and shows unusually high hydrothermal stability, as compared with conventional cubic mesoporous silica materials such as SBA-16.

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Section: Introductionmentioning

confidence: 99%

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confidence: 98%

High‐Temperature Synthesis of Stable Ordered Mesoporous Silica Materials by Using Fluorocarbon–Hydrocarbon Surfactant Mixtures

Han

Song

et al. 2004

Chemistry A European J

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“…Mixed fluorocarbon-hydrocarbon surfactant systems have been studied by light scattering (56), and small angle neutron scattering studies have been made on both mixed micelles of anionic-nonionic (57) and cationic-nonionic (58) hydrocarbon surfactants and anionic-anionic fluorocarbon-hydrocarbon surfactant mixtures (59). A fluorescence probing technique has also been used to investigate micelle sizes in both anionic-nonionic hydrocarbon surfactant mixtures (60), and fluorocarbon-hydrocarbon anionic-nonionic (60,61), nonionic-anionic (61), nonionic-nonionic (61) and anionicanionic (60) surfactant systems.…”

Section: Monomer Concentration and Micelle Compositionmentioning

confidence: 99%

“…Mixtures of fluorocarbon and hydrocarbon surfactants have been extensively studied (47,48,50,56,(59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(73) and are especially interesting because of the potential immisibility of the two types of hydrophobic groups in mixed micelles and the possibility of demixing. The different types of fluorocarbon-hydrocarbon mixed surfactant systems studied have included anionic-anionic (47,48,50,59,60,62,(64)(65)(66)(67)(68)(69), cationic-cationic (63), anionic-cationic (66,69), cationic-anionic (66), and anionicnonionic (56,60), and nonionic-nonionic (64,69) surfactant mixtures.…”

Section: Monomer Concentration and Micelle Compositionmentioning

confidence: 99%

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Mixed Surfactant Systems

Holland¹,

Rubingh

1992

Mixed Surfactant Systems

251

329

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The properties and behavior of mixed surfactant systems are discussed in the context of experimental techniques and modeling. The overview begins with a general description of mixed surfactant solutions, followed by a more detailed examination of mixed micelles, surfactant mixtures at interfaces, and the phase behavior of mixed systems. Topics include experimental measurements, approaches to modeling, nonideality, unusual surfactant types, micellar demixing, adsorption at various interfaces, chemical reactions in micelles, precipitation, cloud point phenomena and perspectives on the direction of future research on mixed surfactant systems.Mixed surfactant systems are encountered in nearly all practical applications of surfactants. These mixtures arise from several sources. First is the natural polydispersity of commercial surfactants which results from impurities in starting materials and variability in reaction products during their manufacture. These are less expensive to produce than isomerically pure surfactants and often provide better performance. Second is the deliberate formulation of mixtures of different surfactant types to exploit synergistic behavior in mixed systems or to provide qualitatively different types of performance in a single formulation (e.g. cleaning plus fabric softening). Finally, practical formulations often require the addition of surfactant additives to help control the physical properties of the product or improve its stability.

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Design and synthesis of a two compartment micellar system based on the self-association behavior of poly(N-acylethyleneimine) end-capped with a fluorocarbon and a hydrocarbon chain

Weberskirch

Preuschen

Spiess

et al. 2000

Macromol. Chem. Phys.

101

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Aggregation behavior of mixed fluorocarbon and hydrocarbon surfactants in aqueous solutions

Cited by 102 publications

References 47 publications

High‐Temperature Synthesis of Stable Ordered Mesoporous Silica Materials by Using Fluorocarbon–Hydrocarbon Surfactant Mixtures

High‐Temperature Synthesis of Stable Ordered Mesoporous Silica Materials by Using Fluorocarbon–Hydrocarbon Surfactant Mixtures

Mixed Surfactant Systems

Design and synthesis of a two compartment micellar system based on the self-association behavior of poly(N-acylethyleneimine) end-capped with a fluorocarbon and a hydrocarbon chain

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