Small-Angle Scattering and Electron Microscopy Investigation of Nanotubules Made from a Perfluoroalkylated Glucophospholipid

Imae, Toyoko; Funayama, Katsuya; Krafft, Marie Pierre; Giulieri, Françoise; Tada, Takeshi; Matsumoto, Takayoshi

doi:10.1006/jcis.1999.6094

Cited by 41 publications

(44 citation statements)

References 34 publications

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“…An interesting tubular-to-vesicle transition as a function of temperature was described by Imae at al. 44 during the study of a fluorinated-hydrogenated glucophospholipid. They attributed such a phenomenon to a local molecular variation of the surfactant packing.…”

Section: E-mentioning

confidence: 99%

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Unusual, pH-Induced, Self-Assembly Of Sophorolipid Biosurfactants

et al. 2012

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International audienceAn increasing need exists for simple, bioderived, nontoxic, and up-scalable compounds with stimuli-responsive properties. Acidic sophorolipids (SL) are glucose-based biosurfactants derived from the yeast broth of Candida bombicola (teleomorph: Starmerella bombicola). The specific design of this molecule, a sophorose head with a free end-COOH group at the end of the alkyl chain, makes it a potentially interesting pH-responsive compound. We have specifically investigated this assumption using a combination of small angle neutron scattering (SANS), transmission electron microscopy under cryogenic conditions (Cryo-TEM), and nuclear magnetic resonance (NMR) techniques and found a strong dependence of SL self-assembly on the degree of ionization, α, of the COOH group at concentration values as low as 5 and 0.5 wt %. At least three regimes can be identified where the supramolecular behavior of SL is unexpectedly different: (1) at low α values, self-assembly is driven by concentration, C, and micelles are mainly identified as nonionic objects whose curvature decreases (sphere-to-rod) with C; (2) at mid α values, the formation of COO– groups introduces negative charges at the micellar surface inducing an increase in curvature (rod-to-sphere transition). Repulsive electrostatic long-range interactions appear at this stage. In both regimes 1 and 2, the cross-section radius of the micelles is below 25 Å. This behavior is concentration independent. (3) At α = 1, individual micelles seem to favor the formation of large netlike tubular aggregates whose size is above 100 nm. Such a complex behavior is very unique as it is generally not observed for common alkyl-based surfactants in concentration ranges below 5–10 wt %

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Section: E-mentioning

confidence: 99%

“…The average side-diameter of our tubules is comparable with the one reported by several authors on lipidic nanotubes. 26,44 In particular, Masuda and Shimizu 26 were able to correlate the stacking periodicity and the size of the inner tube diameter with the chain length and packing of their bolaamphiphiles. In our system, sophorolipids have a C18…”

Section: E-mentioning

confidence: 99%

Unusual, pH-Induced, Self-Assembly Of Sophorolipid Biosurfactants

et al. 2012

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“…Interdigitation of bilayers is thought to be a key feature leading to stability of bilayers supported on colloidal particles, [42][43][44] and fluorination of lipids has been shown to induce the formation of interdigitated bilayers. [45,46] Optimizing the structure with MOPAC 2000 [23] at the PM3 level [47] suggests a fluorocarbon length of 10.3 Å, and an all-trans hydrocarbon length of 13.8 Å. Thus, the optimized, fully extended surfactant tail length is approximately 2.4 nm.…”

Section: Full Papermentioning

confidence: 99%

Synthesis of Inorganic and Organic–Inorganic Hybrid Hollow Particles Using a Cationic Surfactant with a Partially Fluorinated Tail

Tan

Vyas

Lehmler

et al. 2007

Adv Funct Materials

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A new partially fluorinated cationic surfactant, 1‐(10‐perfluorooctyldecyl)pyridinium bromide monohydrate, is synthesized and used as the template for mesoporous ceramic and inorganic–organic hybrid particles. Several hydrolyzed alkoxide precursors are shown to co‐assemble with this surfactant to form hollow vesicle‐like particles, and the effect of changing the alkoxide chemical structure on the formation of these particles is examined. Tetramethoxysilane produces cubic or columnar particles without hollow cavities, but all other tetra‐n‐alkoxysilanes tested up to the n‐butoxide produce hollow particles. As the alkoxide length increases, the shell structure changes from multilayered (with Si(OC2H5)4) to a single thin layer (with Si(OC3H7)4) to a single thick layer (with Si(OC4H9)4). The stability of the fluorocarbon bilayers allows similar vesicular structures to be obtained in organic–inorganic hybrids prepared with bridged alkoxysilanes. Ethylene‐bridged silanes display similar structures to tetraalkoxysilanes. However, the hollow structures appear to partially collapse when the bridging chain is too long (octylene) and no hollow particles are formed with bis(trialkoxysilylpropyl)amines.

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“…Electron microscopy revealed that the tubules are hollow having an outer radius of 140Å and a wall thickness of 105Å, as shown in Figure 5.9. 50 Heating the tubules to 60…”

Section: Glycolipidsmentioning

confidence: 99%