Lipid Tubes with a Temperature‐Tunable Diameter

Douliez, Jean‐Paul; Pontoire, Bruno; Gaillard, Cédric

doi:10.1002/cphc.200600264

Cited by 45 publications

(90 citation statements)

References 24 publications

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“…Then, the tubes diameter decreases again upon a further increase of temperature back to the same initial value (D ~ 0.6 µm) probably in mixture with spherical micelles [19]. Finally, at the end of the melting process (T~70°C), when 12-HSA chains are all in liquid state, only spherical micelles are present in solution.…”

Section: 3) Temperature Effectmentioning

confidence: 93%

“…When 1/2<p<1, bilayers or vesicles are obtained. The nature of the fatty acid and the approach used to disperse it lead to various values of p giving a large variety of fatty acid self-assemblies in aqueous dilute medium (>90 wt.% water) from usual self-assembled morphologies (spherical micelles, worm-like micelles, vesicle and bilayer) to unusual morphologies such as tubes [19], nanodiscs [20], icosahedra [21], buckled membranes [22] or cones [23].…”

Section: 2) Self-assemblies Based On Fatty Acids In Aqueous Solutionmentioning

confidence: 99%

“…In the case of a progressive chain melting, consecutive and complex multiple structural modifications can occur at the mesoscopic scale. The importance of the chain melting process on fatty acid self-assembled structures can be illustrated by the 12-hydroxystearic acid (12-HSA) multilamellar tubes system [19]. The 12-HSA tubes of micron length are obtained via ion-pairing of the 12-hydroxystearic acid monomers with various alkanolamines [46].…”

Section: 3) Temperature Effectmentioning

confidence: 99%

See 2 more Smart Citations

Responsive self-assemblies based on fatty acids

Fameau

Arnould

Saint‐Jalmes

2014

Current Opinion in Colloid & Interface Science

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Section: 3) Temperature Effectmentioning

confidence: 93%

Section: 2) Self-assemblies Based On Fatty Acids In Aqueous Solutionmentioning

confidence: 99%

Section: 3) Temperature Effectmentioning

confidence: 99%

See 1 more Smart Citation

Responsive self-assemblies based on fatty acids

Fameau

Arnould

Saint‐Jalmes

2014

Current Opinion in Colloid & Interface Science

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“…[23][24][25][26] Indeed, the 12-HSA is known to self-assemble into multilamellar micron-size tubes in the presence of alkanolamine as counter-ion. 25 Upon heating, the tubes transform into spherical micelles due to a change in temperature, which in turn change the packing parameter of the fatty acid assemblies.…”

Section: Introductionmentioning

confidence: 99%

Morphological Transition in Fatty Acid Self-Assemblies: A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds

2017

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In surfactant systems, the major role of the nature of the counterion in the surfactant behavior is well-known. However, the effect of the molar ratio between the surfactant and its counterion is less explored in the literature. We investigated the effect of the molar ratio (R) between 12-hydroxystearic acid (12-HSA) and various alkanolamines as a function of the temperature in aqueous solution from the molecular scale to the mesoscale. By coupling microscopy techniques and small-angle neutron scattering, we showed that 12-HSA self-assembled into multilamellar tubes and transitioned into micelles at a precise temperature. This temperature transition depended on both the molar ratio and the alkyl chain length of the counterion and could be precisely tuned from 20 to 75 °C. This thermal behavior was investigated by differential scanning calorimetry and wide-angle X-ray scattering. We highlighted that the transition at the supramolecular scale between tubes and micelles came from two different mechanisms at the molecular scale as a function of the molar ratio. At low R, with an excess of counterion, the transition came from the chain-melting phenomenon. At high R, with an excess of 12-HSA, the transition came from both the chain-melting process and the surface-melting process of the hydrogen bonds. At the mesoscale, this transition of supramolecular assemblies from tubes to micelles delimited a regime of high bulk viscosity, with a regime of low viscosity.

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“…It should also be noted that the main gel-to-liquid transition of DOPC takes place at temperatures well below 0 °C; 13 therefore, the mechanism of tube formation cannot be related to the phase transition of the phospholipid , as is the case for diacetylenic phosphocholines and several other tube-forming lipids. 4,14 Another difference to previously described cholesterol-based systems is the quick formation and the long-term stability of the tubules made from 1 and DOPC. Once formed, the 1 : DOPC microtubes are stable at least for six months.…”

mentioning

confidence: 97%