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Sylvie Roke

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Related publications (133)

Water-Mediated Ion Pairing: Occurrence and Relevance

We present an overview of the studies of ion pairing in aqueous media of the past decade. In these studies, interactions between ions, and between ions and water, are investigated with relatively novel approaches, including dielectric relaxation spectrosco ...

American Chemical Society2016

Freezing effects of oil-in-water emulsions studied by sum-frequency scattering spectroscopy

Sylvie Roke, Nikolay Smolentsev

Temperature-dependent sum-frequency scattering spectroscopy is used to study the properties of hexadecane and dodecane oil droplets in water. The sum-frequency scattering spectra contain vibrational bands that correspond to the symmetric and antisymmetric ...

Amer Inst Physics2016

Second-Harmonic Scattering as a Probe of Structural Correlations in Liquids

Sylvie Roke, Michele Ceriotti, Gabriele Tocci, Chung-Wen Liang, David Mark Wilkins

econd-harmonic scattering experiments of water and other bulk molecular liquids have long been assumed to be insensitive to interactions between the molecules. The measured intensity is generally thought to arise from incoherent scattering due to individua ...

Amer Chemical Soc2016

Second Harmonic and Sum-Frequency Generation from Aqueous Interfaces Is Modulated by Interference

Sylvie Roke, Cornelis Ulrich Lütgebaucks

The interfacial region of aqueous systems also known as the electrical double layer can be characterized on the molecular level with second harmonic and sum-frequency generation (SHG/SFG). SHG and SFG are surface specific methods for isotropic liquids. Her ...

American Chemical Society2016

Optical label-free and model-free probe of the surface potential of nanoscale and microscopic objects in aqueous solution

Sylvie Roke, Cornelis Ulrich Lütgebaucks

The electrostatic environment of aqueous systems is an essential ingredient for the function of any living system. To understand the electrostatic properties and their molecular foundation in soft, living, and three-dimensional systems, we developed a tabl ...

Amer Physical Soc2016

Three Dimensional Nano "Langmuir Trough" for Lipid Studies

Yixing Chen, Sylvie Roke, Kailash Chandra Jena, Cornelis Ulrich Lütgebaucks, Halil Ibrahim Okur

A three-dimensional-phospholipid monolayer with tunable molecular structure was created on the surface of oil nanodroplets from a mixture of phospholipids, oil, and water. This simple nanoemulsion preparation technique generates an in situ prepared membran ...

Amer Chemical Soc2015

From Hydrophobic to Hydrophilic: The Structure and Density of the Hexadecane Droplet/Alkanol/Water Interface

Yixing Chen, Sylvie Roke, Kailash Chandra Jena

The molecular structure of the hexadecane droplet/alkanol/water interface has been investigated using vibrational sum frequency scattering and second harmonic scattering. This combination of methods allows us to investigate the interfacial alkyl chain conf ...

American Chemical Society2015

Device and method for measuring and imaging second harmonic and multi-photon generation scattered radiation

Sylvie Roke, Carlos Alberto Macias Romero

Embodiments of the subject invention relate to a method and apparatus for performing measurements using multiphoton or second harmonic generation (SHG) scattered radiation from a sample including a turbid (scattering) medium includes providing a beam of la ...

2015

Probing Rotational and Translational Diffusion of Nanodoublers in Living Cells on Microsecond Time Scales

Aleksandra Radenovic, Fabrizia Dutto, Lucas Delannoy, Sylvie Roke, Carlos Alberto Macias Romero, Marie Eve Pascale Didier, Vitalijs Zubkovs

Nonlinear microscopes have seen an increase in popularity in the life sciences due to their molecular and structural specificity, high resolution, large penetration depth, and volumetric imaging capability. Nonetheless, the inherently weak optical signals ...

American Chemical Society2014

Electric double layer formation: A molecular level study

Sylvie Roke

Amer Chemical Soc2014

Charge Asymmetry at Aqueous Hydrophobic Interfaces and Hydration Shells

Yixing Chen, Sylvie Roke, Kailash Chandra Jena, Rüdiger Scheu

The solvation of ions in a dielectric continuum is symmetric with respect to the sign of the ionic charge. Yet, many phenomena show indirect evidence that water may have a preference for negative charge: the vast majority of biological membrane interfaces ...

Wiley-Blackwell2014

Toward Vibrational Dynamics at Liquid-Liquid and Nano-Interfaces: Time-Resolved Sum-Frequency Scattering

Sylvie Roke, Rüdiger Scheu

Interfacial molecular dynamics are key to understanding many phenomena in technology and life sciences. We demonstrate a first step toward accessing vibrational dynamics at liquid-liquid and nanoscopic (bio)-interfaces using time-resolved sum-frequency sca ...

American Chemical Society2014

Sum frequency spectroscopy of the hydrophobic nanodroplet/water interface: Absence of hydroxyl ion and dangling OH bond signatures

Sylvie Roke, Rüdiger Scheu, Nikolay Smolentsev

Vibrational sum frequency scattering measurements were performed on deuterated hexadecane oil nanodroplets dispersed in aqueous pH neutral and basic solutions. The predominant symmetry of the observed vibrational signatures was derived using nonlinear ligh ...

Elsevier2014

High throughput second harmonic imaging for label-free biological applications

Pierre Marquet, Pierre Magistretti, Pascal Jourdain, Aleksandra Radenovic, Sylvie Roke, Carlos Alberto Macias Romero, Marie Eve Pascale Didier, Vitalijs Zubkovs, Orly Bagunu Tarun

Second harmonic generation (SHG) is inherently sensitive to the absence of spatial centrosymmetry, which can render it intrinsically sensitive to interfacial processes, chemical changes and electrochemical responses. Here, we seek to improve the imaging th ...

Optical Society of America2014

Sum frequency and second harmonic generation from the surface of a liquid microjet

Yixing Chen, Sylvie Roke, Kailash Chandra Jena, Nikolay Smolentsev

The use of a liquid microjet as a possible source of interest for Second Harmonic Generation (SHG) and Sum Frequency Generation (SFG) spectroscopy is examined. We measured non-resonant SHG scattering patterns from the air/water interface of a microjet of p ...

Amer Inst Physics2014

Specific Ion Effects in Amphiphile Hydration and Interface Stabilization

Yixing Chen, Sylvie Roke, Rüdiger Scheu

Specific ion effects can influence many processes in aqueous solutions: protein folding, enzyme activity, self-assembly, and interface stabilization. Ionic amphiphiles are known to stabilize the oil/water interface, presumably by dipping their hydrophobic ...

Amer Chemical Soc2014

The Presence of Ultralow Densities of Nanocrystallites in Amorphous Poly(lactic acid) Microspheres

Sylvie Roke, Hilton Barbosa De Aguiar

Ultralow densities of crystalline nanospheres have been detected in amorphous polymer microspheres by utilizing the unique sensitivity of second-order nonlinear optical techniques to anisotropy. Vibrational sum frequency scattering (SFS) and X-ray diffract ...

Amer Chemical Soc2013

Analysis of Complex Spectra Using Fourier Filtering

Yixing Chen, Sylvie Roke, Rüdiger Scheu

We present a method to analyze complex spectral data, such as that obtained from vibrational sumfrequency generation (SFG), using Fourier filtering. The proposed filter locates the center frequency of all resonances in a complex data set. The analysis is u ...

Amer Chemical Soc2013

Stern Layer Formation Induced by Hydrophobic Interactions: A Molecular Level Study

Yixing Chen, Sylvie Roke, Rüdiger Scheu

The molecular ionic surface structure and charge of the electric double layer around a nanodroplet and its structural change induced by hydrophobic effects are measured using vibrational coherent surface scattering spectroscopy, second harmonic scattering, ...

Amer Chemical Soc2013

Vesicle Photonics

Jeffrey Alan Hubbell, Demetri Psaltis, Andreas Vasdekis, Sylvie Roke

Amphiphiles, under appropriate conditions, can self-assemble into nanoscale thin membrane vessels (vesicles) that encapsulate and hence protect and transportmolecular payloads.Vesicles assemble naturally within cells but can also be artificially synthesize ...

Annual Reviews2013

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