Gels from a semifluorinated n-alkane in fluorinated solvents as a probe for intermolecular interactions

Tattini, Lorenzo; Nostro, Pierandrea Lo; Scalise, Luca; Ninham, Barry W.; Baglioni, Piero

doi:10.1016/j.jcis.2009.07.037

Cited by 4 publications

(3 citation statements)

References 44 publications

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“…As SFA molecules form gels when temperature decreases, several attempts have been made in order to describe the structure of these gel phases [6,7,12,13]. In particular, the aggregation behavior of F8H16 in alkanes or perfluorinated oils is certainly the most detailed one.…”

Section: Introductionmentioning

confidence: 99%

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study

Gouze

Nardin

Diat

et al. 2019

Colloid and Interface Science Communications

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Semifluorinated alkanes (SFA) are diblock molecules able to self-assemble in various organic media due to their fluorophilic/fluorophobic interactions. Such mixtures accordingly represent a model system for the further elaboration of soft-templated inorganic materials in totally anhydrous media. The aggregation behavior of four SFA species has been studied in two different organic and cyclic solvents in function of temperature by small angle X-ray scattering (SAXS). As long as the SFA-solvent mixtures remain in the liquid state, SAXS patterns reveal an aggregation behavior dependent on temperature and concentration, and on the internal structure of the SFA. We identify the relevant parameters governing the aggregation of these molecules based on the simulation of SAXS data versus temperature.

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Section: Introductionmentioning

confidence: 99%

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study

Gouze

Nardin

Diat

et al. 2019

Colloid and Interface Science Communications

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“…33 FnHm diblocks also form fibers, liquid crystals, and gels. 19,34−36 Diblocks uniquely form gels in both hydrocarbons and fluorocarbons, 37,38 as well as in mixtures of fluorocarbons and hydrocarbons. 39 These gels display fibrous crystalline structures that grow radially from the nucleation points.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Langmuir monolayers of diblocks, when subjected to periodical shear stress, revealed a predominantly elastic behavior that was assigned to the formation of physical 2D gels that occurs even at zero surface pressure ,− Diblocks uniquely form gels in both hydrocarbons and fluorocarbons, , as well as in mixtures of fluorocarbons and hydrocarbons . These gels display fibrous crystalline structures that grow radially from the nucleation points.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Radial or Ring-Banded Nonbirefringent Spherulites of Semifluorinated Alkanes Coexistent with Close-Packed Self-Assembled Surface Nanodomains

et al. 2018

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A series of semifluorinated alkanes (C n F2n+1C m H2m+1 diblocks, F n H m, n = 6, 8, 10; m = 16, 18, 20), when cast as films onto solid substrates, were found to form ring-banded or radial spherulites when heated above their isotropic temperature and subsequently cooled down to room temperature, demonstrating that the formation of two-dimensional (2D) spherulites is a general feature of molecular fluorocarbon–hydrocarbon diblocks. These spherulites are not birefringent, a seldom encountered feature for such structures (never, so far, for spherulites made of small molecules). They also provide examples of fluorinated 2D spherulites. Film morphology was analyzed by optical microscopy, interferometric profilometry, atomic force microscopy (AFM), and scanning electron microscopy. Increasing the length of the Fn segment favors the formation of ring-banded spherulites, whereas short Fn segments tend to favor extended radial stripes. Variation of the cooling rate provides control over the size and morphology of the spherulites: slow cooling promotes fibers and radial spherulites, whereas fast cooling fosters ring-banded spherulites. The AFM studies of F10H16 films revealed that the latter consist of stacks of regularly spaced lamellae. We also observed that, remarkably, stacked lamellae (repeating distance ∼6 nm) can coexist with a layer of close-packed monodisperse circular self-assembled surface nanodomains of Fn Hm diblocks (∼30 nm in diameter); the latter are known to form from such diblocks at interfaces at room temperature. Substrates partially covered with F10H16 contain incomplete ring-banded spherulites and smaller objects in which the lamellae and circular nanodomains coexist.

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Two sides of the coin. Part 2. Colloid and surface science meets real biointerfaces

Ninham

Larsson

Nostro

2017

Colloids and Surfaces B: Biointerfaces

Self Cite

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Part 1 revisited developments in lipid and surfactant self assembly over the past 40 years [1]. New concepts emerged. Here we explore how these developments can be used to make sense of and bring order to a range of complex biological phenomena. Together with Part 1, this contribution is a fundamental revision of intuition at the boundaries of Colloid Science and Biological interfaces from a perspective of nearly 50 years. We offer new insights on a unified treatment of self assembly of lipids, surfactants and proteins in the light of developments presented in Part 1. These were in the enabling disciplines in molecular forces, hydration, oil and electrolyte specificity; and in the role of non Euclidean geometries-across the whole gammut of physical, colloid and surface chemistry, biophysics and membrane biology and medicine. It is where the early founders of the cell theory of biology and the physiologists expected advances to occur as D'Arcy Thompson predicted us 100 years ago.

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Gels from a semifluorinated n-alkane in fluorinated solvents as a probe for intermolecular interactions

Cited by 4 publications

References 44 publications

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study

Two-Dimensional Radial or Ring-Banded Nonbirefringent Spherulites of Semifluorinated Alkanes Coexistent with Close-Packed Self-Assembled Surface Nanodomains

Two sides of the coin. Part 2. Colloid and surface science meets real biointerfaces

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