Sylvie Roke

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Related publications (133)

Laser-Heating-Induced Displacement of Surfactants on the Water Surface

We report a combined vibrational sum-frequency generation (SFG) spectroscopy, Brewster angle microscopy (BAM), and ellipsometry study of different surfactants on water as a function of surfactant density. Vibrational SFG spectra of surfactants on the water ...

2012

Sodium dodecyl sulfate at water-hydrophobic interfaces: A simulation study

Sylvie Roke

Using molecular dynamics simulations, we have studied the water-vapor and water-oil (decane) interfaces of aqueous solutions of sodium dodecyl sulfate (SDS). The water-vapor interface is often used as a model for water-oil (hydrophobic) interfaces, yet we ...

Amer Chemical Soc2012

Comparison of scattering and reflection SFG: a question of phase-matching

Sylvie Roke, Kailash Chandra Jena, Hilton Barbosa De Aguiar, Rüdiger Scheu

We present a comparison between sum frequency scattering (SFS) and reflection mode sum frequency generation (R-SFG). We have used scattering theory to describe both scattering experiments as well as reflection mode experiments. The interfacial vibrational ...

2012

Erratum: Probing nanoscopic droplet interfaces in aqueous solution with vibrational sum-frequency scattering: A study of the effects of path length, droplet density and pulse energy (Chemical Physics Letters (2011) 512 (7680))

Sylvie Roke, Hilton Barbosa De Aguiar

Elsevier2012

Nonlinear Light Scattering and Spectroscopy of Particles and Droplets in Liquids

Sylvie Roke

Nano -and microparticles have optical, structural, and chemical properties that differ from both their building blocks and the bulk materials themselves. These different physical and chemical properties are induced by the high surface-to-volume ratio. As a ...

Annual Reviews2012

Surface Impurities Are Not Responsible For the Charge on the Oil/Water Interface: A Comment

Sylvie Roke, Kailash Chandra Jena, Rüdiger Scheu

A recent communication by Roger and Cabane[1] on the origin of negative charge on the interface between oil and water states that: "The basic assumption of all previous experimental and theoretical studies has been that these systems have "pristine" oil/wa ...

Wiley-VCH Verlag GmbH2012

Theory of optical second-harmonic and sum-frequency scattering from arbitrarily shaped particles

Sylvie Roke

We present a theoretical framework for the generation and scattering of second-harmonic and sum-frequency light from the surface of particles of arbitrary shape in the limit of low index of refraction contrast. For homogeneous and isotropic surfaces, light ...

2011

The Orientation and Charge of Water at the Hydrophobic Oil Droplet-Water Interface

Sylvie Roke, Hilton Barbosa De Aguiar

We established the charge and structure of the oil/water interface by combining zeta-potential measurements, sum frequency scattering (SFS) and molecular dynamics simulations. The SFS experiments show that the orientation of water molecules can be followed ...

2011

Probing nanoscopic droplet interfaces in aqueous solution with vibrational sum-frequency scattering: A study of the effects of path length, droplet density and pulse energy

Sylvie Roke, Hilton Barbosa De Aguiar

We present a description of sum frequency scattering experiments to probe the interfacial vibrational spectrum of nanoscopic oil droplets dispersed in water. SF scattering measurements as a function of optical path length, infrared (IR) pulse energy and pa ...

Elsevier2011

Surface Structure of Sodium Dodecyl Sulfate Surfactant and Oil at the Oil-in-Water Droplet Liquid/Liquid Interface: A Manifestation of a Nonequilibrium Surface State

Sylvie Roke, Hilton Barbosa De Aguiar

We present sum frequency scattering spectra on kinetically stabilized emulsions consisting of nanoscopic oil droplets in water, stabilized with sodium dodecyl sulfate (SDS). We have measured the interfacial structure of the alkyl chains of the surfactant m ...

2011

Direct comparison of phase-sensitive vibrational sum frequency generation with maximum entropy method: Case study of water

Sylvie Roke

We present a direct comparison of phase sensitive sum-frequency generation experiments with phase reconstruction obtained by the maximum entropy method. We show that both methods lead to the same complex spectrum. Furthermore, we discuss the strengths and ...

2011

Nonlinear spectroscopy of bio-interfaces

Sylvie Roke

In the past five years the Max Planck Research Group for Nonlinear spectroscopy of bio-interfaces has worked at the intersection of surface science, nonlinear optics and soft and biological matter. For hard matter there is molecular level understanding of ...

2011

Label-free spectroscopic detection of vesicles in water using vibrational sum frequency scattering

Sylvie Roke, Hilton Barbosa De Aguiar

Vibrational sum frequency scattering (SFS) has been used to study sub-micron, catanionic vesicles in solution. The vesicles were synthesized from a binary mixture of dodecyltrimethylammonium bromide (DTAB) and sodium dodecylsulfate (SDS) surfactants in deu ...

2011

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