Publications by Sylvie Roke | EPFL Graph Search

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

Membrane Potential Fluctuations and Water Asymmetry on Plasma Cell and Model Lipid Membranes: Origins, Implications and Properties

Arianna Marchioro, Bryan Zhi Li, Sylvie Roke, Orly Bagunu Tarun, Iwona Swiderska, Maksim Eremchev, David Roesel, Seonwoo Lee, Mischa Samuel Flór

Membrane potential fluctuations have previously been detected using second harmonic (SH) water imaging on neuronal cells and model lipid bilayer membranes. We report that such fluctuations are also visible when membrane potential-sensitive fluorophores are ...

ROYAL SOC CHEMISTRY2025

Solvent Redistribution Method To Determine Solubility and Aggregation: High Throughput, Accuracy, and Sustainability

Sylvie Roke, Nathan Dupertuis, Orly Bagunu Tarun

American Chemical Society (ACS)2025

Finite Volume Effects in Water Nanodroplets: A Molecular Level Investigation

Sylvie Roke, Saranya Pullanchery Sankara Narayanan, Li Zhang

American Chemical Society (ACS)2025

Dissecting the hydrogen bond network of water: Charge transfer and nuclear quantum effects

Sylvie Roke, David Mark Wilkins, Mischa Samuel Flór

The molecular structure of water is dynamic, with intermolecular hydrogen (H) bond interactions being modified by both electronic charge transfer and nuclear quantum effects (NQEs). Electronic charge transfer and NQEs potentially change under acidic or bas ...

American Association for the Advancement of Science2024

Does the ionic distribution in the electrical double layer modify second harmonic scattering?

Arianna Marchioro, Sylvie Roke, Bingxin Chu

Surface-specific nonlinear optical techniques are ideally suited to investigate the complex structure of aqueous interfaces. For colloidal particles dispersed in aqueous solutions, interfacial properties can be retrieved with angle-resolved second harmonic ...

AIP Publishing2024

Quantified interface chemistry and biophysics via water imaging

Sylvie Roke

High throughput wide-field second harmonic imaging enables the label-free imaging of interfacial (< 3 nm thick) water, with a spatial resolution of similar to 370 nm using similar to 100 ms acquisition times per image. The obtained interfacial orientationa ...

Spie-Int Soc Optical Engineering2024

Dynamic Second Harmonic Imaging of Proton Translocation Through Water Needles in Lipid Membranes

Sylvie Roke, David Roesel, Seonwoo Lee

Proton translocation through lipid membranes is a fundamental process in the field of biology. Several theoretical models have been developed and presented over the years to explain the phenomenon, yet the exact mechanism is still not well understood. Here ...

American Chemical Society (ACS)2024

pH drives electron density fluctuations that enhance electric field-induced liquid flow

Sylvie Roke, Saranya Pullanchery Sankara Narayanan, Sergey Kulik, Tereza Schönfeldová

Liquid flow along a charged interface is commonly described by classical continuum theory, which represents the electric double layer by uniformly distributed point charges. The electrophoretic mobility of hydrophobic nanodroplets in water doubles in magni ...

Springer Science and Business Media LLC2024

Lysozyme Interaction with Phospholipid Nanodroplets Probed by Sum Frequency Scattering Vibrational Spectroscopy

Sylvie Roke, Halil Ibrahim Okur, Jan Dedic, Sergey Kulik

When a nanoparticle (NP) is introduced into a biological environment, its identity and interactions are immediately attributed to the dense layer of proteins that quickly covers the particle. The formation of this layer, dubbed the protein corona, is in ge ...

AMER CHEMICAL SOC2023

Interfacial Inversion, Interference, and IR Absorption in Vibrational Sum Frequency Scattering Experiments

Sylvie Roke, Saranya Pullanchery Sankara Narayanan, Lei Zhang, Sergey Kulik

Molecular interfacial structure greatly determines thepropertiesof nano- and microscale systems. Vibrational sum frequency scattering(SFS) spectroscopy is a unique interface-selective tool to measurethe interfacial vibrational spectrum of sub-micron to mic ...

AMER CHEMICAL SOC2023

Evolution of the electrical double layer with electrolyte concentration probed by second harmonic scattering

Arianna Marchioro, Sylvie Roke, Bingxin Chu, Marie Bischoff

Investigating the electrical double layer (EDL) structure has been a long-standing challenge and has seen the emergence of several sophisticated techniques able to probe selectively the few molecular layers of a solid/water interface. While a qualitative e ...

ROYAL SOC CHEMISTRY2023

Liposomes and Lipid Droplets Display a Reversal of Charge-Induced Hydration Asymmetry

Sylvie Roke, Nathan Dupertuis, Saranya Pullanchery Sankara Narayanan

The unique properties of water are critical for life. Water molecules have been reported to hydrate cations and anions asymmetrically in bulk water, being a key element in the balance of biochemical interactions. We show here that this behavior extends to ...

Amer Chemical Soc2023

Minimum dataset for "Liquid-activated quantum emission from pristine hexagonal boron nitride for nanofluidic sensing"

Aleksandra Radenovic, Sylvie Roke, Jean Camille Benjamin Comtet, Martina Lihter, Evgenii Glushkov, Nathan Cyprien Arsène Ronceray, Benjamin Rehl, Tzu-Heng Chen

Frames and (linked) localization table used to produce Fig. 2 of the manuscript https://www.nature.com/articles/s41563-023-01658-2. Details are given in 'README.txt'. The rest of the data is provided with the paper at the publisher website. ...

Zenodo2023

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

Arianna Marchioro, Sylvie Roke

NATURE PORTFOLIO2023

Size dependence of second-harmonic scattering from nanoparticles: Disentangling surface and electrostatic contributions

Arianna Marchioro, Sylvie Roke, Bingxin Chu

Polarimetric angle-resolved second-harmonic scattering (AR-SHS) is an all-optical tool enabling the study of unlabeled interfaces of nano-sized particles in an aqueous solution. As the second harmonic signal is modulated by interference between nonlinear c ...

AIP Publishing2023

High throughput wide field second harmonic imaging of giant unilamellar vesicles

Sylvie Roke, Pierre-Marc Jean Marie Dansette, Maksim Eremchev, David Roesel

Cell-sized giant unilamellar vesicles (GUVs) are an ideal tool for understanding lipid membrane structure and properties. Label-free spatiotemporal images of their membrane potential and structure would greatly aid the quantitative understanding of membran ...

AIP Publishing2023

Dynamic second-harmonic imaging of divalent cation translocation through giant vesicle membranes

Sylvie Roke, Maksim Eremchev, David Roesel

SPRINGER2023

Passive transport of Ca2+ ions through lipid bilayers imaged by widefield second harmonic microscopy

Sylvie Roke, Maksim Eremchev, David Roesel

In biology, release of Ca2+ ions in the cytosol is essential to trigger or control many cell functions. Calcium signaling acutely depends on lipid membrane permeability to Ca2+. For proper understanding of membrane permeability to Ca2+, both membrane hydra ...

2023

Water Structure at the Hydrophobic Nanodroplet Surface Revealedby Vibrational Sum Frequency Scattering Using Isotopic Dilution br

Sylvie Roke, Saranya Pullanchery Sankara Narayanan, Sergey Kulik

The water structure at the hydrophobic/waterinterface is key toward understanding hydrophobicity at themolecular level. Herein, we characterize the hydrogen-bondingnetwork of interfacial water next to sub-micron-sized hydrophobicoil droplets dispersed in w ...

AMER CHEMICAL SOC2022