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Halil Ibrahim Okur

Cette personne a quitté l’EPFL

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Publications associées (33)

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The Jones–Ray Effect Is Not Caused by Surface-Active Impurities

Sylvie Roke, Halil Ibrahim Okur

Pure aqueous electrolyte solutions display a minimum in surface tension at concentrations of 2 ± 1 mM. This effect has been a source of controversy since it was first reported by Jones and Ray in the 1930s. The Jones–Ray effect has frequently been dismisse ...

2018

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

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

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

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

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

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

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

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

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

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

Nanoemulsions of lipid droplets - a new model lipid system

Sylvie Roke, Halil Ibrahim Okur

WILEY2018

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, David Mark Wilkins

ACS2018