Stacking of Self‐Assembled Surface Micelles in Ultrathin Films

Lux, Caroline de Gracia; Gallani, Jean‐Louis; Waton, Gilles; Krafft, Marie Pierre

doi:10.1002/cphc.201101030

Cited by 11 publications

(15 citation statements)

References 50 publications

(85 reference statements)

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“…Also of interest is that the terminal spots observed by BAM also display high contrast, revealing a local increase in height. These results indicate that the terminal spots likely consist of stacked aggregates of di( F 10 H 16) nanodomains, as reported in the absence of phospholipids …”

Section: Figuresupporting

confidence: 73%

“…Langmuir monolayers of di( F 10 H1 6) consist of nanodomains (40 nm in diameter, Figure b)). The tetrablock was selected because the patterned films it forms are particularly sturdy, and DPPC because of its prominence in the lung surfactant and its conveniently positioned liquid expanded (LE)/liquid condensed (LC) phase transition. We actually discovered a totally new type of 2D organization in the mixed DPPC/di( F 10 H 16) monolayers.…”

Section: Figurementioning

confidence: 99%

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How Self‐Assembled Nanodomains Can Impact the Organization of a Phospholipid Monolayer‐Flower‐Like Arrays

2020

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We found that monolayers of dipalmitoylphosphatidylcholine (DPPC) and semi‐fluorinated tetrablock di(F10H16) self‐assemble to form a new type of large, complex flower‐like patterns on the surface of water and on solid substrates. The hierarchical organization of these unusual self‐assemblies was investigated using compression and surface potential isotherms, in situ fluorescence and Brewster angle microscopies, and atomic force microscopy after transfer.

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Section: Figuresupporting

confidence: 73%

Section: Figurementioning

confidence: 99%

How Self‐Assembled Nanodomains Can Impact the Organization of a Phospholipid Monolayer‐Flower‐Like Arrays

2020

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“…In their bulk solid state they form fibers, liquid crystals and gels . FnHm diblock mono layers actually consist of highly monodisperse, disk‐like domains (20–40 nm in diameter) that form ordered hexagonal lattices . Such diblocks have also been used as film and shell components for modifying and controlling film phase behavior, emulsion stability, liposome stability and permeability, and fiber formation .…”

Section: Figurementioning

confidence: 99%

2D Spherulites of a Semi‐Fluorinated Alkane: Controlled Access to Either Radial Or Ring‐Banded Morphologies

et al. 2017

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Thin films of as emi-fluorinated alkane cast onto solid substrates consist of well-formed two-dimensional non-birefringent ring-banded and/or radial spherulites. Controlling the experimental conditions allows orientation of the crystallization toward either radial-only or ring-banded-only morphologies. Intermediate states were also captured in which both radial and ring-banded spherulites coexist. Monitoring of the formation of these intermediate states broughte videncef or af irst crystallization modet hat sweeps radially outwards from ac entral nucleusu ntil the propagating fronte dge experiences a second crystallization mode that proceeds through ad iffusioncontrolled rhythmic crystallization mechanism that leads to high ( % 2 mm) concentricr idges. These 2D spherulites were investigated by optical and atomicf orce microscopies,i nterferometric profilometry,and off-specularn eutron scattering.Polycrystalline aggregatesw ith an essentially spherical outer boundary,c alled spherulites, are observed to form from al arge variety of compounds, includingo rganic compounds andm inerals.[1] Two-dimensional spherulites have been characterized in films resulting, for example, from solvent evaporation during casting of liquid drops of solutions of such materials on solid substrates. Concentric ring-banded spherulites constitute an intenselyi nvestigated sub-class of spherulites that usually possess chiroptical properties. Such ring-banded spherulites are formed by polymers (e.g. polyethylene and poly(ethylene adipate)), [2] but also by various small organic molecules (e.g. phthalic acid, [3] aspirin, [4] hippuric acid, [5] mannitol, [6] testosterone propionate [7] ), and by inorganic compounds( e.g. potassium dichromatea nd boric acid [8] ). Am ajor distinction needs to be made between spherulites that have at wisted crystal morphology, which is responsible for the "banded" optical texture, and spherulites that have ar eal wave-like topography with actual valleys separated by ridges. The former do not necessarily have a" real" relief, while the latter can exhibit extinction bands or not. Lately,s ubstantial interest has focusedo nn onbirefringent ring-banded spherulites.[9] The latter have only been observed with af ew polymers and never with small molecules. Improving control over the morphology of 2D spherulites and understanding their mechanisms of formation,w hich can involve at wisting of the crystal or ar hythmic crystallization process, both being able to act in interplay,a re neededi n order to tailor new materialc haracteristics.Here we report first that as imple semi-fluorinated alkane, C 10 F 21 C 16 H 33 (F10H16), when deposited as at hin film on solid surfaces (glass or silicon wafers), forms non-birefringent 2D spherulites. To the best of our knowledge,t his is one of the rare examples of non-birefringent 2D spherulites obtained with small organic molecules. Remarkably,depending on the experimental conditions, we could obtain radial-only, or ring-bandedonly spherulites. We attained control of the morpholo...

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“…Despite all efforts, the principles governing their origin and structure are yet to be understood. Their formation at zero surface pressure and resistance to coalescence even under strong compression are particularly puzzling (33)(34)(35)(36). Indeed, it is not at all clear why PFAA monolayers are not uniform, especially considering their size and aggregation number, which is estimated to be on the order of a few thousands of molecules.…”

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confidence: 99%

Spontaneous self-assembly and structure of perfluoroalkylalkane surfactant hemimicelles by molecular dynamics simulations

Silva

Morgado

Lourenço

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Fully atomistic molecular-dynamics (MD) simulations of perfluoroalkylalkane molecules at the surface of water show the spontaneous formation of aggregates whose size and topography closely resemble the experimentally observed hemimicelles for this system. Furthermore, the grazing incidence X-ray diffraction (GIXD) pattern calculated from the simulation trajectories reproduces the experimental GIXD spectra previously obtained, fully validating the MD simulation results. The detailed analysis of the internal structure of the aggregates obtained by the MD simulations supports a definite rational explanation for the spontaneous formation, stability, size, and shape of perfluoroalkylalkane hemimicelles at the surface of water.

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Stacking of Self‐Assembled Surface Micelles in Ultrathin Films

Cited by 11 publications

References 50 publications

How Self‐Assembled Nanodomains Can Impact the Organization of a Phospholipid Monolayer‐Flower‐Like Arrays

How Self‐Assembled Nanodomains Can Impact the Organization of a Phospholipid Monolayer‐Flower‐Like Arrays

2D Spherulites of a Semi‐Fluorinated Alkane: Controlled Access to Either Radial Or Ring‐Banded Morphologies

Spontaneous self-assembly and structure of perfluoroalkylalkane surfactant hemimicelles by molecular dynamics simulations

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