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Sylvie Roke

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Publications associées (133)

Molecular Mechanism for the Interactions of Hofmeister Cations with Macromolecules in Aqueous Solution

Sylvie Roke, Halil Ibrahim Okur

Ion identity and concentration influence the solubility of macromolecules. To date, substantial effort has been focused on obtaining a molecular level understanding of specific effects for anions. By contrast, the role of cations has received significantly ...

AMER CHEMICAL SOC2020

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

Sylvie Roke, Hilton Barbosa De Aguiar, Saranya Pullanchery Sankara Narayanan, Halil Ibrahim Okur, 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

Imaging the Heterogeneity of the Oxygen Evolution Reaction on Gold Electrodes Operando: Activity is Highly Local

Arianna Marchioro, Sylvie Roke, Igor Nahálka

Understanding the mechanism of the oxygen evolution reaction (OER), the oxidative half of electrolytic water splitting, has proven challenging. Perhaps the largest hurdle has been gaining experimental insight into the active site of the electrocatalyst use ...

2020

Endogenous SHG and 2PEF coherence imaging of substructures in neurons in 3D

Sylvie Roke, Carlos Alberto Macias Romero, Marie Eve Pascale Didier, Claire Jacqueline Léa Teulon

Neuronal morphology, long-distance transport and signalling critically depend on the organization of microtubules in the cytoskeleton. Second harmonic generation (SHG) imaging has been recognized as a potentially powerful tool for in situ label-free neuroi ...

2019

Spatiotemporal Imaging of Water in Operating Voltage-Gated Ion Channels Reveals the Slow Motion of Interfacial Ions

Aleksandra Radenovic, Sylvie Roke, Orly Bagunu Tarun, Maksim Eremchev

Ion channels are responsible for numerous physiological functions ranging from transport to chemical and electrical signaling. Although static ion channel structure has been studied following a structural biology approach, spatiotemporal investigation of t ...

American Chemical Society (ACS)2019

Membrane–Protein–Hydration Interaction of α-Synuclein with Anionic Vesicles Probed via Angle-Resolved Second-Harmonic Scattering

Sylvie Roke, Halil Ibrahim Okur, Jan Dedic

Amyloid formation of the protein α-synuclein promotes neurodegeneration in Parkinson's disease. The normal function of α-synuclein includes synaptic vesicle transport and fusion, and the protein binds strongly to negatively charged vesicles in vitro. Here, ...

2019

Correction to “Second-Harmonic Scattering as a Probe of Structural Correlations in Liquids”

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

2019

Water window on membrane biochemistry

Sylvie Roke

AMER CHEMICAL SOC2019

Membrane-protein-hydration interaction of alpha-synuclein with anionic vesicles in solution probed via angle-resolved second harmonic scattering

Sylvie Roke, Jan Dedic

AMER CHEMICAL SOC2019

The interfacial structure of nano-and micron-sized oil and water droplets stabilized with SDS and Span80

Sylvie Roke, Nikolay Smolentsev, Evangelia Zdrali, Esther Amstad, Gianluca Nicolas Etienne

In this work, we provide a comparison between the stability and the interfacial structure of micrometer-sized and nanometer-sized droplets by employing a multi-instrumental approach comprised of the surface-sensitive technique of sum frequency scattering a ...

2019

Water perspective on neuronal activity using wide field second harmonic imaging

Sylvie Roke

AMER CHEMICAL SOC2019

Surface Characterization of Colloidal Silica Nanoparticles by Second Harmonic Scattering: Quantifying the Surface Potential and Interfacial Water Order

Arianna Marchioro, Sylvie Roke, Cornelis Ulrich Lütgebaucks, Marie Bischoff

The microscopic description of the interface of colloidal particles in solution is essential to understand and predict the stability of these systems, as well as their chemical and electrochemical reactivity. However, this description often relies on the u ...

2019

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

Sylvie Roke

AMER CHEMICAL SOC2019

Determination and evaluation of the nonadditivity in wetting of molecularly heterogeneous surfaces

Francesco Stellacci, Quy Ong Khac, Sylvie Roke, Zhi Luo, Michele Ceriotti, Filip Kovacik, David Mark Wilkins, Halil Ibrahim Okur, Anna Murello

The interface between water and folded proteins is very complex. Proteins have "patchy" solvent-accessible areas composed of domains of varying hydrophobicity. The textbook understanding is that these domains contribute additively to interfacial properties ...

National Academy of Sciences2019

Surface chemistry of silica particles in aqueous solution

Arianna Marchioro, Sylvie Roke

AMER CHEMICAL SOC2019

Second harmonic imaging of real-time spatially resolved chemical reaction constants

Sylvie Roke

AMER CHEMICAL SOC2019

Mapping of real-time morphological changes in the neuronal cytoskeleton with label-free wide-field second-harmonic imaging: a case study of nocodazole

Pascal Jourdain, Sylvie Roke, Carlos Alberto Macias Romero, Marie Eve Pascale Didier, Claire Jacqueline Léa Teulon

We demonstrate the use of wide-field high-throughput second-harmonic (SH) microscopy for investigating cytoskeletal morphological changes on the single-cell level. The method allows for real-time, in vitro, label-free measurements of cytoskeletal changes t ...

SPIE-Intl Soc Optical Eng2019

Specific Ion Effects at the Interface of Nanometer-Sized Droplets in Water: Structure and Stability

Sylvie Roke, Evangelia Zdrali, Halil Ibrahim Okur

The interaction of ions with interfaces influences numerous processes in chemistry, physics, and biology, while different ion species behave differently at hydrophobic or hydrophilic interfaces. Despite its importance, ion specificity and its relation to s ...

2019

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

Sylvie Roke, Orly Bagunu Tarun, Halil Ibrahim Okur

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

The Diverse Nature of Ion Speciation at the Nanoscale Hydrophobic/Water Interface

Sylvie Roke, Evangelia Zdrali, Halil Ibrahim Okur

Many biological systems are composed of nanoscale structures having hydrophobic and hydrophilic groups adjacent to one another and in contact with aqueous electrolyte solution. The interaction of ions with such structures is of fundamental importance. Alth ...

AMER CHEMICAL SOC2019

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