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Sylvie Roke

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Related publications (133)

Comment on "Water- water correlations in electrolyte solutions probed by hyper-Rayleigh scattering" [J. Chem. Phys. 147, 214505 (2017)]

Yixing Chen, Sylvie Roke, Nathan Dupertuis, Michele Ceriotti, David Mark Wilkins, Halil Ibrahim Okur, Jan Dedic

AMER INST PHYSICS2018

Temperature dependence of water-water and ion-water correlations in bulk water and electrolyte solutions probed by femtosecond elastic second harmonic scattering

Yixing Chen, Sylvie Roke, Nathan Dupertuis, Halil Ibrahim Okur

The temperature dependence of the femtosecond elastic second harmonic scattering (fs-ESHS) response of bulk light and heavy water and their electrolyte solutions is presented. We observe clear temperature dependent changes in the hydrogen (H)-bond network ...

2018

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

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

2018

Lipid membranes probed label-free with nonlinear light scattering and imaging: Direct probes of surface chemistry

Sylvie Roke

AMER CHEMICAL SOC2018

Low photodamage label-free imaging of single cell activity aimed at mapping neuronal activity

Sylvie Roke, Marie Eve Pascale Didier, Orly Bagunu Tarun

AMER CHEMICAL SOC2018

Orientational ordering of water in extended hydration shells of cations is ion-specific and is correlated directly with viscosity and hydration free energy

Yixing Chen, Sylvie Roke, Chung-Wen Liang, Halil Ibrahim Okur

Specific ion effects in aqueous solutions are investigated at the molecular, nanoscopic and macroscopic levels. Femtosecond elastic second harmonic scattering (fs-ESHS) is used here to assess the chemical effects of ions on molecular and nanoscopic length ...

2017

The Molecular Mechanism of Nanodroplet Stability

Yixing Chen, Sylvie Roke, Evangelia Zdrali, David Mark Wilkins, Halil Ibrahim Okur

Mixtures of nano- and microscopic oil droplets in water have recently been rediscovered as miniature reaction vessels in microfluidic environments and are important constituents of many environmental systems, food, personal care, and medical products. The ...

Amer Chemical Soc2017

Aqueous Nanoscale Systems

Sylvie Roke

In the past five years the Laboratory for fundamental BioPhotonics (LBP) has worked on developing new technology that can access the molecular structure and nanoscale properties of buried aqueous interfaces and aqueous solutions. Using these methods a bett ...

Schweizerische Chemische Gesellschaft2017

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

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

Yixing Chen, Sylvie Roke, 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

Optical imaging of surface chemistry and dynamics in confinement

Sylvie Roke, Carlos Alberto Macias Romero, Halil Ibrahim Okur, Igor Nahálka

We imaged the interfacial structure and dynamics of water in a microscopically confined geometry in three dimensions and on millisecond time scales with a 3D structurally illuminated wide-field second harmonic microscope. Image contrast reports on the orie ...

American Association for the Advancement of Science2017

Characterization of the interface of binary mixed DOPC:DOPS liposomes in water: The impact of charge condensation

Sylvie Roke, Cornelis Ulrich Lütgebaucks, Carlos Alberto Macias Romero

Solutions of liposomes composed of binary mixtures of anionic dioleoylphosphatidylserine (DOPS) and zwitterionic dioleoylphosphatidylcholine (DOPC) are investigated with label-free angle-resolved (AR) second harmonic scattering (SHS) and electrophoretic mo ...

2017

Solvent fluctuations and nuclear quantum effects modulate the molecular hyperpolarizability of water

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

Second-harmonic scattering (SHS) experiments provide a unique approach to probe noncentrosymmetric environments in aqueous media, from bulk solutions to interfaces, living cells, and tissue. A central assumption made in analyzing SHS experiments is that ea ...

Amer Physical Soc2017

Communication: Mean-field theory of water-water correlations in electrolyte solutions

Sylvie Roke, Michele Ceriotti, David Mark Wilkins

Long-range ion induced water-water correlations were recently observed in femtosecond elastic second harmonic scattering experiments of electrolyte solutions. To further the qualitative understanding of these correlations, we derive an analytical expressio ...

American Institute of Physics2017

Interfacial Structure and Hydration of 3D Lipid Monolayers in Aqueous Solution

Yixing Chen, Sylvie Roke, Nikolay Smolentsev, Evangelia Zdrali, Halil Ibrahim Okur

Three-dimensional (3D) phospholipid monolayers at hydrophobic surfaces are ubiquitous and found in nature as adiposome organelles or in man-made materials such as drug delivery systems. However, the molecular level understanding of such monolayers remains ...

American Chemical Society2017

Intermolecular Headgroup Interaction and Hydration as Driving Forces for Lipid Transmembrane Asymmetry

Sylvie Roke, Cornelis Ulrich Lütgebaucks, Nikolay Smolentsev, Halil Ibrahim Okur

Variations between the inner and outer leaflets of cell membranes are crucial for cell functioning and signaling, drug–membrane interactions, and the formation of lipid domains. Transmembrane asymmetry can in principle be comprised of an asymmetric charge ...

American Chemical Society2016

Wide-field medium-repetition-rate multiphoton microscopy reduces photodamage of living cells

Sylvie Roke, Carlos Alberto Macias Romero, Vitalijs Zubkovs, Siyuan Wang

Demands of higher spatial and temporal resolutions in linear and nonlinear imaging keep pushing the limits of optical microscopy. We showed recently that a multiphoton microscope with 200 kHz repetition rate and wide-field illumination has a 2–3 orders of ...

2016

Electrolytes induce long-range orientational order and free energy changes in the H-bond network of bulk water

Yixing Chen, Sylvie Roke, Nikolaos Gomopoulos, Carlos Alberto Macias Romero, Michele Ceriotti, Gabriele Tocci, Chung-Wen Liang, David Mark Wilkins, Halil Ibrahim Okur

Electrolytes interact with water in many ways: changing dipole orientation, inducing charge transfer, and distorting the hydrogen-bond network in the bulk and at interfaces. Numerous experiments and computations have detected short-range perturbations that ...

American Association for the Advancement of Science (AAAS)2016

Protons and Hydroxide Ions in Aqueous Systems

Sylvie Roke

Understanding the structure and dynamics of water's constituent ions, proton and hydroxide, has been a subject of numerous experimental and theoretical studies over the last century. Besides their obvious importance in acid-base chemistry, these ions play ...

American Chemical Society2016

What interactions can distort the orientational distribution of interfacial water molecules as probed by second harmonic and sum frequency generation?

Sylvie Roke

Aqueous interfaces are omnipresent in nature. Nonlinear optical methods such as second harmonic and sum frequency generation (SHG/SFG) are valuable techniques to access molecular level information from these interfaces. In the interpretation of SHG and SFG ...

American Institute of Physics2016

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