Fluorinated lamellar phases: structural characterisation and use as templates for highly ordered silica materials

Soft Matter ◽  
2014 ◽  
Vol 10 (27) ◽  
pp. 4902-4912 ◽  
Author(s):  
Matthew J. Pottage ◽  
Tiara Kusuma ◽  
Isabelle Grillo ◽  
Christopher J. Garvey ◽  
Anthony D. Stickland ◽  
...  
Keyword(s):  
Lamellar Phase ◽  
Fluorinated Surfactant ◽  
Structural Characterisation ◽  
Lamellar Phases ◽  
Silica Materials ◽  
Sodium Perfluorooctanoate

Highly ordered silica was synthesised by using a lamellar phase comprising the anionic fluorinated surfactant sodium perfluorooctanoate and the partially-fluorinated co-surfactant/oil 1H,1H,2H,2H-perfluorooctan-1-ol in water.

scholarly journals Dynamic Rheological Analysis of MLVs and Lamellar Phases in the System C12E4 / D2O

2005 ◽  
Vol 15 (4) ◽  
pp. 230-237 ◽  
Author(s):  
Luigi Coppola ◽  
Isabella Nicotera ◽  
Cesare Oliviero
Keyword(s):  
Mechanical Properties ◽  
Strong Dependence ◽  
Aggregate Size ◽  
Small Strain ◽  
Lamellar Phase ◽  
Micellar Phase ◽  
Temperature Range ◽  
Lamellar Phases ◽  
Rheological Experiments ◽  
Mechanical Spectra

AbstractThe mechanical properties of the lamellar phase, La, of the system C12E4/D2O were studied along an isoplethal path (30 wt% C12E4) in the temperature range 10 - 60°C. A dynamic analysis was determined by small strain oscillatory rheometry. The multilamellar vesicles (“MLVs”) (“onions”) were transformed by shearing the lamellar phase. The micellar phase was investigated by steady and dynamic rheological experiments. The micellar aggregate size increases slightly upon heating and the transition from micelles to lamellae appears to be a first order transition. The mechanical spectra of the lamellar phase show a strong dependence of the moduli on the frequency. This is typical of defective lamellar phases. They are different from MLVs mechanical spectra. The MLVs viscous and storage moduli are almost independent from the frequency and they exhibit the characteristics of a strong gel. The temperature of formation of the MLVs phase influences the mechanical properties of the MLVs. Three different packing states of the MLVs phase were observed in the temperature range 25 - 55°C.

Formation of Nanostructured Silica Materials Templated with Nonionic Fluorinated Surfactant Followed by in Situ SAXS

Langmuir ◽  
2013 ◽  
Vol 29 (6) ◽  
pp. 2007-2023 ◽  
Author(s):  
Julien Schmitt ◽  
Marianne Impéror-Clerc ◽  
Florentin Michaux ◽  
Jean-Luc Blin ◽  
Marie-José Stébé ◽  
...  
Keyword(s):  
Fluorinated Surfactant ◽  
Silica Materials ◽  
Nanostructured Silica

scholarly journals The Importance of Free Fatty Chain Length on the Lipid Organization in the Long Periodicity Phase

2021 ◽  
Vol 22 (7) ◽  
pp. 3679
Author(s):  
Charlotte M. Beddoes ◽  
Denise E. Rensen ◽  
Gert S. Gooris ◽  
Marc Malfois ◽  
Joke A. Bouwstra
Keyword(s):  
Chain Length ◽  
Skin Diseases ◽  
Fluid Phase ◽  
Lamellar Phase ◽  
Inflammatory Skin Diseases ◽  
Repeat Distance ◽  
Lamellar Phases ◽  
Lipid Chain ◽  
Inflammatory Skin ◽  
Skin Conditions

The skin’s barrier ability is an essential function for terrestrial survival, which is controlled by intercellular lipids within the stratum corneum (SC) layer. In this barrier, free fatty acids (FFAs) are an important lipid class. As seen in inflammatory skin diseases, when the lipid chain length is reduced, a reduction in the barrier’s performance is observed. In this study, we have investigated the contributing effects of various FFA chain lengths on the lamellar phase, lateral packing. The repeat distance of the lamellar phase increased with FFA chain length (C20–C28), while shorter FFAs (C16 to C18) had the opposite behaviour. While the lateral packing was affected, the orthorhombic to hexagonal to fluid phase transitions were not affected by the FFA chain length. Porcine SC lipid composition mimicking model was then used to investigate the proportional effect of shorter FFA C16, up to 50% content of the total FFA mixture. At this level, no difference in the overall lamellar phases and lateral packing was observed, while a significant increase in the water permeability was detected. Our results demonstrate a FFA C16 threshold that must be exceeded before the structure and barrier function of the long periodicity phase (LPP) is affected. These results are important to understand the lipid behaviour in this unique LPP structure as well as for the understanding, treatment, and development of inflammatory skin conditions.

scholarly journals Isotropic, nematic, and lamellar phases in colloidal suspensions of nanosheets

2018 ◽  
Vol 115 (26) ◽  
pp. 6662-6667 ◽  
Author(s):  
Patrick Davidson ◽  
Christophe Penisson ◽  
Doru Constantin ◽  
Jean-Christophe P. Gabriel
Keyword(s):  
Liquid Crystalline ◽  
Colloidal Suspensions ◽  
Domain Size ◽  
Lamellar Phase ◽  
Local Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Lamellar Phases ◽  
Liquid Crystalline Phases ◽  
Electrically Charged

The phase diagram of colloidal suspensions of electrically charged nanosheets, such as clays, despite their many industrial uses, is not yet understood either experimentally or theoretically. When the nanosheet diameter is very large (∼100 nm to 1 µm), it is quite challenging to distinguish the lamellar liquid-crystalline phase from a nematic phase with strong stacking local order, often called “columnar” nematic. We show here that newly upgraded small-angle X-ray scattering beamlines at synchrotron radiation facilities provide high-resolution measurements which allow us to identify both phases unambiguously, provided that single domains can be obtained. We investigated dilute aqueous suspensions of synthetic Sb3P2O143−nanosheets that self-organize into two distinct liquid-crystalline phases, sometimes coexisting in the same sample. Close examination of their X-ray reflection profiles in the directions perpendicular to the director demonstrates that these two mesophases are a columnar nematic and a lamellar phase. In the latter, the domain size reaches up to ∼20 µm, which means that each layer is made of >600 nanosheets. Because the lamellar phase was only rarely predicted in suspensions of charged disks, our results show that these systems should be revisited by theory or simulations. The unexpected stability of the lamellar phase also suggests that the rims and faces of Sb3P2O143−nanosheets may have different properties, giving them a patchy particle character.

scholarly journals Interaction and structuration of membrane-binding and membrane-excluding colloidal particles in lamellar phases

Soft Matter ◽  
2019 ◽  
Vol 15 (21) ◽  
pp. 4351-4362
Author(s):  
Ruben Zakine ◽  
Dasith de Silva Edirimuni ◽  
Doru Constantin ◽  
Paolo Galatola ◽  
Jean-Baptiste Fournier
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Colloidal Particles ◽  
Membrane Binding ◽  
Gaussian Model ◽  
Lamellar Phase ◽  
Discrete Gaussian Model ◽  
Lamellar Phases ◽  
Comparison With Experimental Data

Within the framework of a discrete Gaussian model, we present analytical results, Monte Carlo simulations, and comparison with experimental data for the interaction between colloidal particles embedded in a lamellar phase.

Structural Studies on Equimolar Suspensions of Palmitic Acid and 1-Lyso-Palmitoyl-Phosphatidylcholine

1997 ◽  
Vol 489 ◽  
Author(s):  
J. Lemmich ◽  
F. Richter ◽  
T. H. Callisen
Keyword(s):  
Palmitic Acid ◽  
Room Temperature ◽  
Time Course ◽  
Lamellar Phase ◽  
Scanning Calorimetry ◽  
Time Resolved ◽  
Micellar Phase ◽  
X Ray ◽  
Lamellar Phases ◽  
Slow Kinetics

AbstractAn equimolar mixture of palmitic acid (PA) and 1-lyso-palmitoyl-phosphatidylcholine (Lyso-PPC) has been studied by time-resolved small angle and wide angle X-ray scattering during temperature cycles between room temperature and 53.5 °C. In addition to the X-ray experiments, differential scanning calorimetry (DSC) with a similar temperature vs. time course was performed. At room temperature we observe a coexistence of two different lamellar phases. Our results indicate that in one of these lamellar phases, Lyso-PPC and PA associate in lamellar structures resembling di-palmitoyl-phosphatidylcholine (DPPC) bilayers, whereas the other phase is an interdigitated lamellar phase, where the acyl chains of both Lyso-PPC and PA extend across the entire hydrocarbon width of the bilayer. Upon heating, the latter phase disappears at 42 °C, corresponding to the chain-melting temperature for DPPC bilayers. At a higher temperature the remaining lamellar phase undergoes a phase transition into an isotropic micellar phase. In the cooling scans a particular slow kinetics of the regeneration of the two lamellar phases is observed. Our experiments provide new information about this system where only the DPPC-like mesophase has been reported before.

scholarly journals Long and very long lamellar phases in model stratum corneum lipid membranes

2019 ◽  
Vol 60 (5) ◽  
pp. 963-971 ◽  
Author(s):  
Petra Pullmannová ◽  
Elena Ermakova ◽  
Andrej Kováčik ◽  
Lukáš Opálka ◽  
Jaroslav Maixner ◽  
...  
Keyword(s):  
Stratum Corneum ◽  
Lipid Membranes ◽  
Lamellar Phase ◽  
X Ray Diffraction ◽  
Repeat Distance ◽  
Lamellar Phases ◽  
Stratum Corneum Lipid ◽  
Microscopy Data ◽  
Lipid Layers ◽  
Cholesteryl Sulfate

Membrane models of the stratum corneum (SC) lipid barrier, either healthy or affected by recessive X-linked ichthyosis, constructed from ceramide [Cer; nonhydroxyacyl sphingosine N-tetracosanoyl-d-erythro-sphingosine (CerNS24) alone or with omega-O-acylceramide N-(32-linoleyloxy)dotriacontanoyl-d-erythro-sphingosine (CerEOS)], FFAs(C16–24), cholesterol (Chol), and sodium cholesteryl sulfate (CholS) were investigated. X-ray diffraction (XRD) revealed a previously unreported polymorphism of the membranes. In the absence of CerEOS, the membranes formed a short lamellar phase (SLP; the repeat distance d = 5.3 nm), a medium lamellar phase (MLP; d = 10.6 nm), or very long lamellar phases (VLLP; d = 15.9 and 21.2 nm). An increased CholS-to-Chol ratio modulated the membrane polymorphism, although the CholS phase separated at ≥ 7 weight% (of total lipids). The presence of CerEOS led to the stable long lamellar phase (LLP) with d = 12.2 nm and prevented VLLP formation. Our XRD results agree well with recently published cryo-electron microscopy data for vitreous skin sections, while also revealing new structures. Thus, lamellar phases with long repeat distances (MLP and VLLP) may be formed in the absence of omega-O-acylceramide, whereas these ultralong Cer species likely stabilize the final SC lipid architecture of LLP by riveting the adjacent lipid layers.

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