Phase-separated surfactant monolayers: Exploiting immiscibility of fluorocarbons and hydrocarbons to pattern interfaces

Paige, Matthew F.; Eftaiha, Ala’a F.

doi:10.1016/j.cis.2017.07.023

Cited by 20 publications

(19 citation statements)

References 98 publications

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“…Seoane et al [34] reported mixed films of cholesterol with saturated or unsaturated fatty acids, but these are not discussed here due to the peculiar characteristics of cholesterol. Several authors [23,[25][26][27]30,32] have also observed phase separation in fatty acid mixed monolayers of fluorinated and hydrogenated amphiphiles.…”

Section: Discussionmentioning

confidence: 99%

“…One of the main aspects of these mixtures is the miscibility and phase separation. Recent articles on mixed fatty acids systems are those of [23][24][25][26][27][28][29][30][31][32]. Furthermore, since fatty acids or phospholipids usually present unsaturations in the hydrocarbon chains, the study of mixtures of saturated and unsaturated compounds is of interest.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Behaviour of Mixed Films of an Unsaturated and a Saturated Polar Lipid. (Oleic Acid-Stearic Acid and POPC-DPPC)

Torrent‐Burgués

2018

Colloids and Interfaces

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Mixed fatty acids or mixed phospholipids systems with saturated-unsaturated hydrocarbon chains are of biological interest. In this work, the monolayers of oleic acid-stearic acid (OA-SA) and palmitoyloleoylphosphatidylcholine-dipalmitoylphosphatidylcholine (POPC-DPPC) have been studied. From the surface pressure-area isotherms, elastic modulus values and virial equation coefficients can be obtained. Thermodynamic treatment also yields excess (G E ) and mixing (∆G mix ) free energies. Results indicate positive G E values, that is, molecular interactions in the mixed films are less favourable, due to the presence of unsaturation; however, the mixture is slightly favourable due to the entropic factor that affords positive ∆G mix values. For the OA-SA system, a high SA content and surface pressure facilitate the phase separation, even though a certain miscibility between both components still remains. For the POPC-DPPC system, the most favourable mixing conditions occur for X POPC ≈ 0.4. For these mixed systems, the values of the elastic modulus are more similar to those of more fluid components (OA or POPC); analysis of the virial coefficients shows that the b 1 virial coefficient values lie between those of the individual components and are higher than values suitable for an ideal mixing.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Behaviour of Mixed Films of an Unsaturated and a Saturated Polar Lipid. (Oleic Acid-Stearic Acid and POPC-DPPC)

Torrent‐Burgués

2018

Colloids and Interfaces

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“…The two surfactants are mutually immiscible and are phase-separated at the air-water interface; the general subject matter of patterning surfactants using this approach has recently been reviewed. 12 Carefully-selected monolayer preparation conditions (mixing ratio, surface pressure) results in the formation of welldefined domains of PCDA dispersed in a matrix of PF. In addition to inducing phase-separation, the PF also serves to mechanically rigidify and stabilize the films at the air-water interface, which D r a f t eliminates the need to add additional stabilizing counterions to the underlying subphase.…”

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confidence: 99%

Fluorescence anisotropy imaging of a polydiacetylene photopolymer film

et al. 2019

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UV-illumination of phase-separated surfactant films prepared from mixtures of photopolymerizable 10,12-pentacosadiynoic acid and perfluorotetradecanoic acid results in the formation of fluorescent polydiacetylene fibers and aggregates. In this work, the orientation of polymer strands that comprise the resulting photopolymer structures has been probed using fluorescence anisotropy imaging in combination with defocused single-molecule fluorescence imaging. Imaging experiments indicate the presence of significant fiber-to-fiber heterogeneity, as well as anisotropy within each fiber (or aggregate), with both of these properties changing as a function of film preparation conditions. This anisotropy can be attributed to various alignments of the constituent polymer strands that comprise the larger fibers and aggregates. Intriguingly, when using defocused imaging, fiber images consisted of a series of discrete “doughnut” fluorescence emission patterns, which exhibited intermittent on–off blinking behavior; both of these properties are characteristic of individual emission transition dipoles (single molecules). Further, all of the individual emission transition dipoles had a uniform orientation with respect to the axis of the fiber, indicating a common orientation of discrete emitters in the larger polymer fiber. The implications of these results for future studies of the electronic properties of conjugated polymers in larger macroscopic systems are noted.

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“…Two‐dimensional mesoscopic structural patterns such as striped and circular domains are known to form spontaneously in various systems, including nanoparticles, block copolymers and surfactants . Domain shapes and shape transitions have intensively been investigated in phospholipid films, as they pertain to the self‐assembling process of microdomains in plasma membranes, such as functional rafts .…”

Section: Figurementioning

confidence: 99%

“…Binary systems involving phospholipids, surfactants or polymers, and FnHm diblocks or related compounds have been studied . The general view is that the nanodomains coexist with the phospholipid monolayer without disturbing it.…”

Section: Figurementioning

confidence: 99%

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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Phase-separated surfactant monolayers: Exploiting immiscibility of fluorocarbons and hydrocarbons to pattern interfaces

Cited by 20 publications

References 98 publications

Thermodynamic Behaviour of Mixed Films of an Unsaturated and a Saturated Polar Lipid. (Oleic Acid-Stearic Acid and POPC-DPPC)

Thermodynamic Behaviour of Mixed Films of an Unsaturated and a Saturated Polar Lipid. (Oleic Acid-Stearic Acid and POPC-DPPC)

Fluorescence anisotropy imaging of a polydiacetylene photopolymer film

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

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