Responsive self-assemblies based on fatty acids

Fameau, Anne‐Laure; Arnould, Audrey; Saint‐Jalmes, Arnaud

doi:10.1016/j.cocis.2014.08.005

Cited by 83 publications

(71 citation statements)

References 64 publications

(114 reference statements)

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“…In fatty acid systems, the degree of protonation controls the morphology of the self-assembly in solution because of the modification of the effective headgroup area and consequently the packing parameter [14][15][16].…”

Section: Self-assembled Microstructures Transition Induced By Uv Irramentioning

confidence: 99%

“…The degree of protonation modifies the effective headgroup area as well as the molecular interactions between the headgroups. These modifications at the molecular scale lead to a change in packing parameter, which in turn change the morphology of the self-assembled microstructure [14][15][16]. In aqueous solution, a pH change can be obtained by either manually introducing additives or by the use of CO 2 [2,3,15,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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pH-responsive fatty acid self-assembly transition induced by UV light

Arnould

Gaillard

Fameau

2015

Journal of Colloid and Interface Science

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Section: Self-assembled Microstructures Transition Induced By Uv Irramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

pH-responsive fatty acid self-assembly transition induced by UV light

Arnould

Gaillard

Fameau

2015

Journal of Colloid and Interface Science

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“…Recent concerns regarding Earth depollution have generated studies on aqueous dispersions of the vesicular systems consisting of fatty acids from plant renewable resources [1,2]. These vesicular systems (RCOO − HOOCR) are formed from the unionized fatty acid (RCOOH) and its corresponding alkaline salt (RCOO − ) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…These vesicular systems (RCOO − HOOCR) are formed from the unionized fatty acid (RCOOH) and its corresponding alkaline salt (RCOO − ) [1,2]. Due to their origin, these associated dispersed systems, in the form of bilayered vesicles, are biocompatible, biodegradable, and non-toxic and can be classified in the green chemistry field [3].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Non-Toxic Silica Particles Stabilized by Molecular Complex Oleic-Acid/Sodium Oleate

Spataru

Ianchiş

Petcu

et al. 2016

IJMS

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The present work is focused on the preparation of biocompatible silica particles from sodium silicate, stabilized by a vesicular system containing oleic acid (OLA) and its alkaline salt (OLANa). Silica nanoparticles were generated by the partial neutralization of oleic acid (OLA), with the sodium cation present in the aqueous solutions of sodium silicate. At the molar ratio OLA/Na+ = 2:1, the molar ratio (OLA/OLANa = 1:1) required to form vesicles, in which the carboxyl and carboxylate groups have equal concentrations, was achieved. In order to obtain hydrophobically modified silica particles, octadecyltriethoxysilane (ODTES) was added in a sodium silicate sol–gel mixture at different molar ratios. The interactions between the octadecyl groups from the modified silica and the oleyl chains from the OLA/OLANa stabilizing system were investigated via simultaneous thermogravimetry (TG) and differential scanning calorimetry (DSC) (TG-DSC) analyses.A significant decrease in vaporization enthalpy and an increase in amount of ODTES were observed. Additionally, that the hydrophobic interaction between OLA and ODTES has a strong impact on the hybrids’ final morphology and on their textural characteristics was revealed. The highest hydrodynamic average diameter and the most negative ζ potential were recorded for the hybrid in which the ODTES/sodium silicate molar ratio was 1:5. The obtained mesoporous silica particles, stabilized by the OLA/OLANa vesicular system, may find application as carriers for hydrophobic bioactive molecules.

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“…In the context of pure fatty acids, only few studies exist in this sense and they mainly concern the selfassembly of oleic acid (18:1 cis-9) only. 37 For instance, the group of S. R. Raghavan illustrated that sodium oleate (NaOA) forms pH sensitive vesicles (at pH higher than ∼10) that undergo a transition from vesicles to micelles as the pH is increased. 38 When it comes to the comparison of oleic to elaidic and stearic acids, little, if nothing, can be found.…”

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confidence: 99%

pH- and Time-Resolved in Situ SAXS Study of Self-Assembled Twisted Ribbons Formed by Elaidic Acid Sophorolipids

et al. 2018

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. pH-and time-resolved in-situ SAXS study of self-assembled twisted ribbons formed by elaidic acid sophorolipids. Langmuir, American Chemical Society, 2017, 34 (5) Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. Abstract:Conditions that favor the helical structure formation in structurally similar sophorolipids (SLs), that is, elaidic acid SLs (having trans double bond between the C9 -C10 positions of the alkyl chain) and stearic acid SLs (no double bond) are presented here. The helical self -assembled structures formed by elaidic acid SLs were independent of pH and also were mediated by micellar intermediate. On the other hand, the stearic acid SLs formed helical structures under low pH condition only. Astonishingly, the formation routes were found to be different, albeit the molecular geometry of both the SLs is similar. Though a conclusive mechanistic understanding must await further work, our studies strongly point out that the non -covalent weak interactions in elaidic acid SL are able to overcome the electrostatic repulsions of the sophorolipid carboxylate groups at basic pH and facilitating the formation of helical structures. On the other hand, the hydrophobic interactions in stearic acid SLs endows the helical structures extra stability making them less vulnerable to dissolution upon heating.

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Responsive self-assemblies based on fatty acids

Cited by 83 publications

References 64 publications

pH-responsive fatty acid self-assembly transition induced by UV light

pH-responsive fatty acid self-assembly transition induced by UV light

Synthesis of Non-Toxic Silica Particles Stabilized by Molecular Complex Oleic-Acid/Sodium Oleate

pH- and Time-Resolved in Situ SAXS Study of Self-Assembled Twisted Ribbons Formed by Elaidic Acid Sophorolipids

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