Publications de Sylvie Roke | EPFL Graph Search

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

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

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

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, Orly Bagunu Tarun, Nathan Dupertuis

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, Mischa Samuel Flór, David Mark Wilkins

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?

Sylvie Roke, Arianna Marchioro, 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, Seonwoo Lee, David Roesel

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, Jan Dedic, Halil Ibrahim Okur, 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