Localized oscillations and Fraunhofer diffraction in crystalline phases of a monolayer

Galván-Miyoshi, J.M.; Ramos, Salvador; Ruíz-García, Jaime; Castillo, Rolando

doi:10.1063/1.1409401

Cited by 27 publications

(31 citation statements)

References 20 publications

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“…These 3D protruding aggregates cannot be detected with BAM because of the low contrast of the monolayer and the limited BAM spatial resolution (<4 µm). However, sometimes it is possible to see localized oscillations 17 and buckling 18 in the monolayer, considered mechanisms of expulsion of material from the monolayer in rigid monolayers, below the collapse. The 3D protruding aggregates are scarcely found when the prepolymerized OTE is handled with extreme care and when transferences are made at lateral pressures Π of ∼10-12 mN/m.…”

Section: Resultsmentioning

confidence: 99%

Interactions and Conformations of α-Helical Human Apolipoprotein CI on Hydrophilic and on Hydrophobic Substrates

2004

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Interactions between amphiphilic R-helical human apolipoprotein CI (APO CI) adsorbed on hydrophilic and on hydrophobic surfaces were studied using an interferometric surface force apparatus in an effort to understand the surface conformation and the binding activity of this protein. We used mica as the hydrophilic substrate and polymerized octadecyltriethoxysilane (OTE)-covered mica as the hydrophobic substrate. The OTE monolayer and the OTE Langmuir-Blodgett film were studied using Brewster angle microscopy and atomic force microscopy, respectively. We found that interaction forces between layers of APO CI adsorbed on hydrophilic and on hydrophobic surfaces are mainly due to electrostatic double-layer forces at large surface distances and to steric repulsive forces at small distances. In some cases, no force was measured prior to finding a steric wall, suggesting that a complete neutralization of the surface charge was achieved by the protein adsorption. Protein layer thickness values allow us to give an image of the organization and conformation of the APO CI protein on surfaces. The adhesion obtained in both kinds of surfaces indicates that the interaction between the hydrophobic sides of the APO CI proteins is stronger than that between the hydrophilic sides of the protein.

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Section: Resultsmentioning

confidence: 99%

Interactions and Conformations of α-Helical Human Apolipoprotein CI on Hydrophilic and on Hydrophobic Substrates

2004

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“…These rings are multilayer granules formed from the ejection of matter from the compressed monolayer when localized oscillations are present and account for the thermodynamic instability of the film. [45] In an attempt to correlate structural and amphiphilic properties of 1-4, as well as to compare with other similar metalloamphiphiles the following conclusions can be drawn: It is evident that 2-4 have roughly twice the area per molecule than 1, this is due to the fact that 2-4 have two HL tBuODA ligands coordinated to the metal center, while 1 contains a single ligand. The areas observed for 2-4 are the comparable to other tert-butyl-substituted phenolate-containing amphiphiles.…”

Section: Amphiphilic Propertiesmentioning

confidence: 99%

On the Effect of Coordination and Protonation Preferences in the Amphiphilic Behavior of Metallosurfactants with Asymmetric Headgroups

et al. 2009

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(9) were synthesized to model the stoichiometric, coordination, and protonation chemistry in the waxy metallosurfactants 1-4. Detailed data analysis and comparison between 1-4 and 5-9 involved mass spectrometric and spectroscopic methods along with crystallographic determination of 5 (P2 1 /c), 6 (P1), 7 (P2 1 /c), 8Ј (the analogue of 8 with tetraphenylborate counterions, P2 1 /c), and 9 (P1). DFT calculations were used to identify the frontier orbitals, polarizability, and dipole moments. Species 1-4 had their

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“…[42] The compression of films has been investigated for L PyC 18 Figure 5. Beginning with ligand L PyC 18 (Figure 5a), compression at 5 mN m À1 showed a homogeneous surface with sporadic Newton circles, [43] which were attributed to multilayer granule formation from ejection of matter due to localized oscillations. As the lateral compression continued, the pressure increases prompted the ligand to undergo a 2D liquid-gas phase transition (13-15 mN m À1 ).…”

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Interfacial Behavior and Film Patterning of Redox‐Active Cationic Copper(II)‐Containing Surfactants

Driscoll¹,

Allard²,

Wu³

et al. 2008

Chemistry A European J

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Herein, we describe the synthesis and characterization of a novel series of single-tail amphiphiles LPyCn (Py=pyridine, Cn=C18, C16, C14, C10) and their copper(II)-containing complexes, which are of relevance for patterned films. The N-(pyridine-2-ylmethyl)alkyl-1-amine ligands and their complexes [CuIICl2(LPyC18)] (1), [CuIICl2(LPyC16)] (2), [CuIICl2(LPyC14)] (3), [CuIIBr2(LPyC18)] (4), [CuIIBr2(LPyC16)] (5), and [CuIIBr2(LPyC10)] (6) were synthesized, isolated, and characterized by means of mass spectrometry, IR and NMR spectroscopies, and elemental analysis. Complexes 1, 2, 3, and 6 had their molecular structure solved by X-ray diffraction methods, which showed that the local geometry around the metal center is distorted square planar. With the aim of using these species as precursors for redox-responsive films, an assessment of their electrochemical properties involved cyclic voltammetry in different solvents, with different supporting electrolytes and scan rates. Density functional theory calculations of relevant species in bulk and at interfaces were used to evaluate their electronic structure and dipole moments. The morphology and order of the resulting films at the air/water interface were studied by isothermal compression and Brewster angle microscopy. Biphasic patterned Langmuir films were observed for all complexes except 3 and 6, and dependence on the chain length and the nature of the halogen coligand determine the characteristics of the isotherms and their intricate topology. Complexes 3 and 6, which have shorter chain lengths, failed to exhibit organization. These results exemplify the first comprehensive study of the behavior of single-tail metallosurfactants, which are likely to lead to high-end technological applications based on their patterned films.

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Localized oscillations and Fraunhofer diffraction in crystalline phases of a monolayer

Cited by 27 publications

References 20 publications

Interactions and Conformations of α-Helical Human Apolipoprotein CI on Hydrophilic and on Hydrophobic Substrates

Interactions and Conformations of α-Helical Human Apolipoprotein CI on Hydrophilic and on Hydrophobic Substrates

On the Effect of Coordination and Protonation Preferences in the Amphiphilic Behavior of Metallosurfactants with Asymmetric Headgroups

Interfacial Behavior and Film Patterning of Redox‐Active Cationic Copper(II)‐Containing Surfactants

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