Sum-frequency vibrational spectroscopy of a Langmuir film: Study of molecular orientation of a two-dimensional system

Guyot‐Sionnest, Philippe; Hunt, James B.; Shen, Y. R.

doi:10.1103/physrevlett.59.1597

Cited by 654 publications

(738 citation statements)

References 12 publications

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“…Additionally, a decrease in CTAB surface density and increased conformational disorder of the surfactant alkyl chains is observed, based on the ratio of amplitudes for the CH 2 and CH 3 symmetric stretches. 13 Furthermore, the line shape at the high-frequency end of the SFG spectra changes appreciably with increasing salicylate concentration, due to a reduction of the contribution of OH stretches from oriented water molecules in the electric double layer. Further details are discussed in the SI.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

The Elasticity of Soap Bubbles Containing Wormlike Micelles

2014

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Slow-motion imaging of the rupture of soap bubbles generally shows the edges of liquid films retracting at a constant speed (known as the Taylor−Culick velocity). Here we investigate soap bubbles formed from simple solutions of a cationic surfactant (cetyltrimethylammonium bromide -CTAB) and sodium salicylate. The interaction of salicylate ions with CTAB leads to the formation of wormlike micelles (WLM), which yield a viscoelastic behavior to the liquid film of the bubble. We demonstrate that these elastic bubbles collapse at a velocity up to 30 times higher than the Taylor−Culick limit, which has never been surpassed. This is because during the bubble inflation, the entangled WLM chains stretch, storing elastic energy. This extra energy is then released during the rupture of the bubble, yielding an additional driving force for film retraction (besides surface tension). This new mechanism for the bursting of elastic bubbles may have important implications to the breakup of viscoelastic sprays in industrial applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

The Elasticity of Soap Bubbles Containing Wormlike Micelles

2014

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“…As shown by GuyotSionnest et al [76], if a Langmuir monolayer is compressed to a highly condensed phase, where the alkyl chains are known to be in the alltrans conformation and nearly vertical, the SFG spectrum in the CH stretch range is dominated by the terminal methyl group, even though there is usually an overwhelmingly large number of methylene groups along the alkyl chain. This is due to the inversion symmetry of the inplane arrangement of CH 2 groups, which point in opposite directions (and perpendicular to the chain axis), leading to a cancelation of their contribution.…”

Section: Sum-frequency Generation Spectroscopymentioning

confidence: 97%

“…The molecular structuring, orientation and hydration levels of Langmuir monolayers can be monitored with SFG, as was demonstrated for the first time decades ago [76]. Furthermore, SFG spectroscopy is unique in its ability to probe the organization of water molecules at interfaces [102], and in particular its interaction with Langmuir films [78].…”

Section: Cell Membrane Modelsmentioning

confidence: 98%

Vibrational spectroscopy for probing molecular-level interactions in organic films mimicking biointerfaces

Volpati

Aoki

Aléssio

et al. 2014

Advances in Colloid and Interface Science

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“…Second-order Infrared-Visible (IR-VIS) Sum Frequency Generation (SFG) is the lowest order nonlinear response to probe molecular composition and structure at interfaces (Zhu et al, 1987); (Guyot-Sionnest et al, 1987); (Walker et al, 1997); (Chen et al, 2010); (Xiao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…To answer the experimental progress, recent effort in the theory of SFG microscopy image reconstruction (Volkov, 2014) suggests a computational protocol to calculate and map selected (by polarization setting) nonlinearities of normal modes of terminal methyls to address the surface of a weakly deformed membrane. The selection of the indicated modes is because they are relatively localized and have resonances that exhibit a distinct peak at about 2950 cm -1 (Guyot-Sionnest et al, 1987); (Walker et al, 1997); (Schleeger, 2014). The developed here approach assumes that terminal methyls are distributed in well-determined leaflets of a phospholipid bilayer: inter-digitation is not expected in well-hydrated membranes under physiological conditions.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Infrared–Visible Sum Frequency Generation Microscopy Images of a Giant Liposome

Volkov

Perry

2016

Microsc Microanal

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The article explores the theory of Infrared-Visible Sum Frequency Generation microscopy of phospholipid envelopes with dimensions larger than the wavelength of the nonlinear emission.The main part of the study concerns derivation and accounting for the contributions of effective nonlinear responses specific to sites on the surfaces of a bilayer envelope and their dependence on polarization condition and experimental geometry. The nonlinear responses of sites are mapped onto the image plane according to their emission directions and the numerical aperture of a sampling microscope objective. According to the simulation results, we discuss possible approaches to characterize the shape of the envelope, to extract molecular hyperpolarizabilities, to anticipate possible heterogeneity in envelope composition and anisotropy of the environment proximal to the envelope. The modeling approach offers a promising analytic facility to assist connecting microscopy observations in engineered liposomes, cellular envelopes and sub-cellular 2 organelles of relatively large dimensions to molecular properties and hence to chemistry and structure down to available the spatial resolution.

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Sum-frequency vibrational spectroscopy of a Langmuir film: Study of molecular orientation of a two-dimensional system

Cited by 654 publications

References 12 publications

The Elasticity of Soap Bubbles Containing Wormlike Micelles

The Elasticity of Soap Bubbles Containing Wormlike Micelles

Vibrational spectroscopy for probing molecular-level interactions in organic films mimicking biointerfaces

Modeling of Infrared–Visible Sum Frequency Generation Microscopy Images of a Giant Liposome

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