Grazing incidence scattering

Wolff, Max

doi:10.1051/epjconf/201818804002

Cited by 14 publications

(12 citation statements)

References 53 publications

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“…Introductions about GISANS can be found in Refs. [28,29]. The measurements of the C 10 E 4 microemulsion have been described elsewhere [15] and initiated the usual procedure for all our GISANS measurements.…”

Section: Methodsmentioning

confidence: 99%

Exploring Hidden Local Ordering in Microemulsions with a Weak Directive Second Order Parameter

2020

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So far, the near-surface ordering of microemulsions was focused on lamellar ordering while the bulk microemulsion was bicontinuous. In a series of different non-ionic surfactants the near-surface ordering of microemulsions at a hydrophilic silicon surface was studied using grazing incidence small angle neutron scattering. For the surfactant C 8 E 3 , most likely a gyroid structure was found at the solid-liquid interface, while the more efficient surfactants find lamellar ordering up to lamellar capillary condensation. The ranges for near-surface ordering are deeper than the bulk correlation lengths. These findings point towards theories that use directional order parameters that would lead to deeper near-surface ordering than simple theories with a single scalar order parameter would predict. Rheology experiments display high viscosities at very low shear rates and, therefore, support the existence of a directional order parameter.

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Section: Methodsmentioning

confidence: 99%

Exploring Hidden Local Ordering in Microemulsions with a Weak Directive Second Order Parameter

2020

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“…Secondly, the wavelength of cold neutrons is in the 5 to 20 Å range, and the scattering wave vector q is thus appropriate for the study of nanostructures. Here one also understands immediately that the wavelength of typically 10 Å is still a bit too small as compared to large soft matter structures, which may reach up to thousands of Ångström, with the consequence that one needs to measure at small angles (typically well below a few degrees) in order to characterize these structures [96]. Thirdly, the energy of the neutron is comparable to the thermal energy kT, which we have seen to be characteristic for soft matter systems.…”

Section: Introduction To Neutron Scattering and Sansmentioning

confidence: 93%

“…Jean-Marc Zanotti et al present inelastic and quasi-elastic scattering applied to soft matter [26]. Finally, Fabrice Cousin and Alexis Chennevière discuss neutron reflectivity aiming at density profiles perpendicular to surfaces [95], and Max Wolff, the main organizer of this winter school with Fabrice Cousin, introduces grazing incidence scattering capable of revealing in-surface structures [96].…”

Section: Introducing Complexity By Combining Soft Matter Systemsmentioning

confidence: 99%

Introduction to soft matter and neutron scattering

Oberdisse

2018

EPJ Web of Conferences

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As an opening lecture to the French-Swedish neutron scattering school held in Uppsala (6th to 9th of December 2016), the basic concepts of both soft matter science and neutron scattering are introduced. Typical soft matter systems like self-assembled surfactants in water, microemulsions, (co-)polymers, and colloids are presented. It will be shown that widely different systems have a common underlying physics dominated by the thermal energy, with astonishing consequences on their statistical thermodynamics, and ultimately rheological properties – namely softness. In the second part, the fundamentals of neutron scattering techniques and in particular small-angle neutron scattering as a powerful method to characterize soft matter systems will be outlined.

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“…We will present in the first part the principle of NR by an approach where the spin of neutrons is not taken into account. Besides, the other aspects of grazing incidence scattering (off-specular scattering, Grazing Incidence Small Angle Neutron Scattering) are not EPJ Web of Conferences 188, 04001 (2018) https://doi.org/10.1051/epjconf/201818804001 JDN 23 Titre abrégé du colloque presented here but are extensively presented in the course devoted to it by Max Wolff in this thematic volume [6]. We will describe in the second part how it is possible to realize a NR experiment from practical point of view (description of instruments and of possible geometries of measurements, sample environments, accessibility to neutrons beams…).…”

Section: Introductionmentioning

confidence: 99%

Neutron reflectivity for soft matter

Cousin

Chennevière

2018

EPJ Web of Conferences

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Specular neutron reflectivity is a technique enabling the measurement of coherent neutron scattering length density profile perpendicular to the plane of a surface or interface, and thereby the profile of chemical composition. The characteristic sizes that are probed range from around 5Å up 5000 Å. It is a scattering technique that averages information over the entire surface and it is therefore not possible to obtain information on correlations in the plane of the interface. The specific properties of neutrons (possibility of tuning the contrast by isotopic substitution, negligible absorption, low energy of the incident neutrons) makes it particularly interesting in the fields of soft matter and biophysics. This course is composed of three parts describing respectively its principle, the experimental aspects (diffractometers, samples), and some scientific examples of neutron reflectometry focusing on the use of contrast variation to probe polymeric systems.

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Grazing incidence scattering

Cited by 14 publications

References 53 publications

Exploring Hidden Local Ordering in Microemulsions with a Weak Directive Second Order Parameter

Exploring Hidden Local Ordering in Microemulsions with a Weak Directive Second Order Parameter

Introduction to soft matter and neutron scattering

Neutron reflectivity for soft matter

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