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Sylvie Roke

Cette personne a quitté l’EPFL

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Publications associées (128)

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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

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

Sylvie Roke, Yixing Chen, 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

Interaction of Oil and Lipids in Freestanding Lipid Bilayer Membranes Studied with Label-Free High-Throughput Wide-Field Second-Harmonic Microscopy

Sylvie Roke, Orly Bagunu Tarun, Maksim Eremchev

The interaction of oils and lipids is relevant for membrane biochemistry since the cell uses bilayer membranes, lipid droplets, and oily substances in its metabolic cycle. In addition, a variety of model lipid membrane systems, such as freestanding horizon ...

2018

Optical label- and model-free probing of the surface potential of nanoscale silica particles in aqueous solution

Sylvie Roke, Arianna Marchioro, Cornelis Ulrich Lütgebaucks

AMER CHEMICAL SOC2018

Lipid Melting Transitions Involve Structural Redistribution of Interfacial Water

Sylvie Roke, Halil Ibrahim Okur, Tereza Schönfeldová, Filip Kovacik

Morphological and gel-to-liquid phase transitions of lipid membranes are generally considered to primarily depend on the structural motifs in the hydrophobic core of the bilayer. Structural changes in the aqueous headgroup phase are typically not considere ...

AMER CHEMICAL SOC2021

Water as a contrast agent to quantify surface chemistry and physics using second harmonic scattering and imaging: A perspective

Sylvie Roke

Molecular level interactions that take place at the interface of different materials determine their local electrical, chemical, and mechanical properties. In the case of solid interfaces, this information has traditionally been obtained with experimental ...

AIP Publishing2022

Sum-Frequency Scattering Spectroscopy Reveals the Charging Mechanism and Surface Structure of hBN Nanoflakes in Solution

Aleksandra Radenovic, Sylvie Roke, Li Zhang, Nathan Cyprien Arsène Ronceray, Benjamin Rehl

A molecular understanding of the interactions between two-dimensional (2D) layered materials and liquids is crucial for nanofluidics, catalysis, and solution-based 2D material processing. Among 2D materials, hexagonal boron nitride (hBN) has a number of ou ...

American Chemical Society (ACS)2025

The interfacial structure of water droplets in a hydrophobic liquid

Sylvie Roke, Nikolay Smolentsev

Nanoscopic and microscopic water droplets and ice crystals embedded in liquid hydrophobic surroundings are key components of aerosols, rocks, oil fields and the human body. The chemical properties of such droplets critically depend on the interfacial struc ...

Springer Nature2017

Endogenous second harmonic and two photon coherence imaging of substructures in neurons in 3D

Sylvie Roke

AMER CHEMICAL SOC2019

Chemistry of Lipid Membranes from Models to Living Systems: A Perspective of Hydration, Surface Potential, Curvature, Confinement and Heterogeneity

Sylvie Roke, Halil Ibrahim Okur, Orly Bagunu Tarun

Lipid membranes provide diverse and essential functions in our cells relating to transport, energy harvesting and signaling. This variety of functions is controlled by the molecular architecture, such as the presence of hydrating water, specific chemical c ...

2019

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

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

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

Probing nanoscopic droplet interfaces in aqueous solution with vibrational sum-frequency scattering: A study of the effects of path length, droplet density and pulse energy

Sylvie Roke

We present a description of sum frequency scattering experiments to probe the interfacial vibrational spectrum of nanoscopic oil droplets dispersed in water. SF scattering measurements as a function of optical path length, infrared (IR) pulse energy and pa ...

Elsevier2011

Long-range interactions of ions with water determine the Jones-Ray effect

Sylvie Roke

AMER CHEMICAL SOC2019

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

Sylvie Roke

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

On the stability and necessary electrophoretic mobility of bare oil nanodroplets in water

Sylvie Roke, Halil Ibrahim Okur, Saranya Pullanchery Sankara Narayanan, Sergey Kulik

Hydrophobic oil droplets, particles, and air bubbles can be dispersed in water as kinetically stabilized dispersions. It has been established since the 19th century that such objects harbor a negative electrostatic potential roughly twice larger than the t ...

AMER INST PHYSICS2020

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

A discrepancy of 10(7) in experimental and theoretical density detection limits of aerosol particles by surface nonlinear light scattering

Sylvie Roke, Arianna Marchioro

NATURE PORTFOLIO2023

Zwitterionic and Charged Lipids Form Remarkably Different Structures on Nanoscale Oil Droplets in Aqueous Solution

Sylvie Roke, Yixing Chen, Halil Ibrahim Okur, Cornelis Ulrich Lütgebaucks

2018

The Jones-Ray Effect Reinterpreted: Surface Tension Minima of Low Ionic Strength Electrolyte Solutions are caused by Electric Field Induced Water-Water Correlations

Sylvie Roke, Yixing Chen, Halil Ibrahim Okur

The surface tension of electrolyte solutions exhibits a minimum at millimolar electrolyte concentrations and then rises with increasing concentration. This minimum, known as the Jones-Ray effect, has been hotly debated over the past 80 years. If not consid ...

Elsevier2017

Dynamic second-harmonic imaging of lipid membrane hydration induced by copper ions

Sylvie Roke, David Roesel, Seonwoo Lee

SPRINGER2021