The Directional Dependence of Water Penetration into Langmuir–Blodgett Multilayers

Girard, Kevin P.; Quinn, John A.; Vanderlick, T. Kyle

doi:10.1006/jcis.1999.6364

Cited by 10 publications

(21 citation statements)

References 26 publications

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“…23 One of the fundamental scientific problems in such heterogeneous interactions is how the interfacial molecules are solvated, and particularly, whether the water molecule penetrates into the interfacial molecules to solvate them. Even though there have been some indirect experimental evidence and suggestions in the studies of the molecular surfaces, such as in the Langmuir monolayer and the Langmuir-Blodgett (LB) films, that water penetration or accommodation did occur, 7,[24][25][26] such phenomena and the role in the structure and the phase behaviour of the Langmuir monolayer and the LB films have not been well explored, due to difficulties in dealing with the phenomena using the available experimental techniques and theoretical methods. 27 Spectroscopic methods are basic and important tools that have tremendously facilitated the understanding of the molecular structure and interactions.…”

Section: Introductionmentioning

confidence: 99%

Water penetration/accommodation and phase behaviour of the neutral langmuir monolayer at the air/water interface probed with sum frequency generation vibrational spectroscopy (SFG-VS)

Zhang

Dong

Guo

et al. 2009

Phys. Chem. Chem. Phys.

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A strong and broad hydrogen bonded O-H band around 3520 cm(-1) is observed in the insoluble monolayer of the neutral liquid crystal molecules of 4''-n-pentyl-4-p-cyanobiphenyl (5CB) and 4''-n-octyl-4-p-cyanobiphenyl (8CB) throughout the whole surface density range, but not in the 4-pentyl-4'-cyanoterphenyl (5CT) monolayer, at the air/water interface. This novel spectral feature suggests the existence of an oriented water cluster species which has penetrated or accommodated into the Langmuir monolayer of the 8CB and 5CB molecules. This finding provided a molecular level mechanism for the stark difference in the phase behaviour between the CB and CT insoluble Langmuir monolayers at the air/water interface. It also calls for attention to the details of the specific water-surface interaction in mediating the structure and the phase behaviour of the molecular assemblies at the heterogeneous aqueous interfaces.

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Section: Introductionmentioning

confidence: 99%

Water penetration/accommodation and phase behaviour of the neutral langmuir monolayer at the air/water interface probed with sum frequency generation vibrational spectroscopy (SFG-VS)

Zhang

Dong

Guo

et al. 2009

Phys. Chem. Chem. Phys.

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“…Both the QCM and the SFA, however, also allow one to explore the kinetics of vapor uptake into these materials. We have previously shown that due to geometrical considerations, the QCM primarily measures transport normal to the deposited layers, while the SFA primarily measures transport laterally or parallel to the layers . It was found that for pure fatty acid LB films, the lateral diffusion rate of water was at least 100 times faster than the normal diffusion rate .…”

Section: Resultsmentioning

confidence: 99%

“… a Diffusivities are derived from fitting first-order Fickian kinetics to the swelling data (not shown) (ref ). …”

Section: Resultsmentioning

confidence: 99%

“…Details on the construction and operation of our home-built microbalance have been previously described . Similarly, details on the use of the surface forces apparatus for measuring film thicknesses and associated swelling have been fully described in a previous publication . We note that both techniques in our laboratory are configured similarly to allow vapor evacuation and dosing to controlled pressures.…”

Section: Methodsmentioning

confidence: 99%

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Vapor Sorption into Pure and Mixed Fatty Acid Multilayers

2002

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The sorption of polar and nonpolar vapors into Langmuir−Blodgett multilayers of pure arachidic acid (C20) was compared to that in films formed of a 1:1 mixture of behenic acid (C22) and stearic acid (C18). The mass of vapor sorbed was quantified using a quartz crystal microbalance. Film swelling was determined using multiple beam interferometry as implemented in the surface forces apparatus. We find that the solubility of water in the pure and the mixed films is the same. Moreover, the absorption of water is ideal in the sense that the film swelling observed is consistent with the incorporation of water at its bulk molar volume. In contrast, the solubilities of pentane, decane, and pentanol were higher in the mixed fatty acid films than in the pure film. The additional free volume available in the mixed films (due to alkane chain mismatch) also results in nonideal absorption of these organic vapors. Vapor sorption kinetic data support the hypothesis that the transport rate is governed primarily by large “pitlike” defects spanning multiple layers within the film structure.

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“…Previous spectroscopic studies confirm that transport of water trough these well-ordered densely packed films is a slow process. 12 The interlamellar separation temporal evolution was fitted with the following double exponential model a)…”

Section: Hydration Kinetics Of Oriented Lipid Membranes Investigated mentioning

confidence: 99%

Hydration kinetics of oriented lipid membranes investigated by energy dispersive x-ray diffraction

Caracciolo

Sadun

Caminiti

2004

Applied Physics Letters

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Pressure tuning of phase transitions is a powerful tool in condensed matter physics, permitting high-resolution studies while preserving fundamental symmetries. At the highest pressures, energy dispersive x-ray diffraction EDXD has been a critical method for geometrically confined diamond anvil cell experiments. We develop a chemical filter technique complementary to EDXD that permits the study of satellite peaks as weak as 10 −4 of the crystal Bragg diffraction. In particular, we map out the temperature dependence of the incommensurate charge density wave diffraction from single-crystal, elemental chromium. This technique provides the potential for future GPa pressure studies of many-body effects in a broad range of solid state systems.

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The Directional Dependence of Water Penetration into Langmuir–Blodgett Multilayers

Cited by 10 publications

References 26 publications

Water penetration/accommodation and phase behaviour of the neutral langmuir monolayer at the air/water interface probed with sum frequency generation vibrational spectroscopy (SFG-VS)

Water penetration/accommodation and phase behaviour of the neutral langmuir monolayer at the air/water interface probed with sum frequency generation vibrational spectroscopy (SFG-VS)

Vapor Sorption into Pure and Mixed Fatty Acid Multilayers

Hydration kinetics of oriented lipid membranes investigated by energy dispersive x-ray diffraction

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