Micelle-smectic phase coexistence: Origin of the maximum swelling of a mixed lamellar phase

Ricoul, F.; Dubois, M.; Zemb, Thomas; Plusquellec, Daniel

doi:10.1007/s100510050388

Cited by 20 publications

(15 citation statements)

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“…Peaks of PSDs settled from 2.2 to 2.6 nm corresponding to the thickness of the DDAB bilayer are observed for both samples. [28] The broadened PSDs of both samples (4-50nm) are roughly consistent with the inner diameter of the hollow cavities indicated by TEM. The powder XRD patterns of the calcined silica products are recorded (Fig.…”

supporting

confidence: 68%

The Effect of Template Phase on the Structures of As‐Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates

Zhang

Liu

et al. 2007

Advanced Materials

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In recent years, the synthesis of organized inorganic materials has attracted enormous attention in the chemistry and material communities due to their potential applications and great benefits in understanding biomineralization processes. [1][2][3][4][5] Template synthesis is an effective means to construct organized inorganic materials. A series of templates, including lyotropic liquid crystals, [6][7][8][9] block copolymers, [10] microemulsions, [11] and polymer latex particles [12] have been chosen to prepare organized inorganic materials with different components and morphologies. Especially, papers dealing with surfactant-templated synthesis of vesicle-like hollow silica particles have increased dramatically because of the distinguished advantages of these materials, such as low density, high surface area and surface permeability, and potential applications in encapsulation, controlled release of drugs, catalysis, separation, and so forth. [13][14][15][16][17][18][19] Lipid vesicles play very important roles in the studies of models for biomembranes and vehicles for drug and gene delivery. [20,21] There were few works reporting the creation of hollow silica particles by using lipid vesicles as templates. For instance, German et al. synthesized hollow silica nanoparticles by using unilamellar dimethyldioctadecylammonium bromide (DODAB) vesicles as the templates.[14] The understanding of silica nanoparticles formation that occurs in lipid vesicle solutions is of quite general importance for the template synthesis of organized inorganic materials and comprehension of biomineralization processes. In addition, phase transition is one of important properties for lipids; [22] therefore, it is interesting to investigate the effect of template phase on the synthesis of organized inorganic materials. However, to the best of our knowledge, few works concerned the effect of the lipid phase on the structures of the products. [23] In this communication, diverse silica nanoparticles were synthesized with tetraethylorthosilicate (TEOS) as the silica source by the direction of fragile didodecyldimethylammonium bromide (DDAB) vesicles. More interestingly, it was found that the phase of DDAB vesicles greatly influenced the structures of the as-synthesized silica nanoparticles. The DDAB vesicles in aqueous dispersions exhibit a gel to liquid-crystalline phase transition at temperature of 16°C, [24] i.e., the main phase transition temperature (T m ) of DDAB vesicles is 16°C. The experimental results indicate that the template phase is a crucial factor for the structure of the resulting silica nanoparticles. When the reaction temperature (at around 20°C) was higher than T m of DDAB vesicles in aqueous solution, the majority of the silica nanoparticles were solid spheres, meanwhile some hollow spheres existed. However, when the reaction temperature (at around 8°C) was lower than T m , the prepared silica nanoparticles were mostly hollow spheres. Moreover, the performed experiments confirm that the typical silica nanoparticles are...

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supporting

confidence: 68%

The Effect of Template Phase on the Structures of As‐Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates

Zhang

Liu

et al. 2007

Advanced Materials

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“…Since it derives independently from three different measures of the scattering curves this result for the aggregate shape is a very solid assumption, even if the given size appears to be exceptionally small for a vesicle system. However, it should be noted here that only somewhat larger vesicles have recently been reported for the Triton X-100/ cetylpyridinium chloride/octanol/water system (16,25,26) and mixtures of DDABr (didodecyl-dimethylammonium bromide) and 2-O lauroylsaccharose (27).…”

Section: Small-angle Neutron Scattering (Sans)mentioning

confidence: 88%

Phase Behavior, Structure, and Physical Properties of the Quaternary System Tetradecyldimethylamine Oxide, HCl, 1-Hexanol, and Water

Beck

Gradzielski

Horbaschek

et al. 2000

Journal of Colloid and Interface Science

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“…However, the detailed structure of the lamellar phase in isopropanol might be distinct from the well-known lamellar phase of lipids dispersed in water. 38 For 30% and 40% water contents ͑Fig. 2͒, no notable signals can be observed.…”

Section: A Determination Of Volume Phases By Saxsmentioning

confidence: 99%

“…Micellelike structures are known to occur in binary isopropanolwater mixtures, without lipid, at 60% water content. 38,39 It is likely that in the ternary system, phospholipids will incorporate into these spherical aggregates. Our data are consistent with a polydisperse, Gaussian distributed system of spherical micelles with a radius of 2.5 nmϮ 1 nm and a headgroup size of 0.2 nm.…”

Section: A Determination Of Volume Phases By Saxsmentioning

confidence: 99%

Controlled solvent-exchange deposition of phospholipid membranes onto solid surfaces

Hohner¹,

David²,

Rädler³

2010

Biointerphases

115

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Micelle-smectic phase coexistence: Origin of the maximum swelling of a mixed lamellar phase

Cited by 20 publications

References 0 publications

The Effect of Template Phase on the Structures of As‐Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates

The Effect of Template Phase on the Structures of As‐Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates

Phase Behavior, Structure, and Physical Properties of the Quaternary System Tetradecyldimethylamine Oxide, HCl, 1-Hexanol, and Water

Controlled solvent-exchange deposition of phospholipid membranes onto solid surfaces

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