-
Julian Oberdisse (Université Montpellier)16/12/2025, 14:00
The molecular structure of mesoporous solid ionic systems is crucial for optimizing macroscopic properties, in particular ionic transport for energy applications. It will be shown how the combination of SAXS and SANS can be used to extract quantitative structural information on the nanoscale by appropriate rescaling in both contrast and scale. We report on the structural analysis of ionic...
Go to contribution page -
Sandrine Dourdain (ICSM)16/12/2025, 14:20
Third-phase formation—an unintended splitting of the organic phase during solvent extraction—creates major operational issues and limits the metal loading that can be safely processed. This demixing arises from the self-assembly of extractant molecules into reverse aggregates whose attractive interactions eventually lead to macroscopic phase separation, but the underlying structural mechanisms...
Go to contribution page -
Wolfgang Fieber (dsm-firmenich)16/12/2025, 14:40
Hydrophobic additives, such as essential oils or fragrances, can have a tremendous impact on the viscosity and viscoelasticity of aqueous surfactant gels. The effects are best understood by constructing complete salt curves using sodium laureth sulfate (SLES) in the presence of various additives. A total of four distinct mechanisms of solute-surfactant interactions was identified that...
Go to contribution page -
Anne-Laure Fameau (INRAE)16/12/2025, 15:00
Oil foams can be used in food, cosmetics, and pharmaceutical formulations, for enhancing textures, improving product application, and delivering active ingredients. Traditionally, they have been stabilized with a high concentration of surfactants that form crystalline particles [1]. Recently, oil foams were produced with hydrocarbon-based surfactants, but without the presence of crystalline...
Go to contribution page -
Jan Skov Pedersen (Aarhus University, Denmark)16/12/2025, 16:00
A long time ago, Thomas Zemb pointed out that a published study had claimed electron densities corresponding to aluminium in the cores of certain surfactant micelles, something that would have been impossible had absolute-scale modelling been applied together with molecular and concentration constraints. I already appreciated the importance of this approach from my work with contrast-variation...
Go to contribution page -
Luc Belloni (CEA/Saclay)16/12/2025, 16:20
The golden age of colloidal physics began in the early 1980s with the simultaneous development of scattering techniques (X-ray, neutron, light) and simple liquid theories (integral equations, Poisson-Boltzmann) applied to the interaction between colloids in solution.
From the very beginning, a very fruitful collaboration with Thomas Zemb led to the writing of numerous practical numerical...
Go to contribution page -
Christiane Alba-Simionesco (LLB)16/12/2025, 16:40
In situ centrifugation introduces a controllable gravitational field directly during neutron or X-rays scattering experiments, making it a new thermodynamic control parameter, on par with temperature, pressure, or magnetic fields. By applying high gravitational accelerations (up to several thousand g), it enables real-time observation of structure and phase evolution in soft matter systems...
Go to contribution page -
Regine von Klitzing (TU Darmstadt)16/12/2025, 17:00
Foams appear in many applications such as in personal care products, firefighting and food technology. An elegant tool to tune the foam stability is the addition of polymers of different charge, amphiphilicity or molecular architecture. An example, which will be addressed here are foams which are stabilized by stimuli-responsive microgels.
Go to contribution page
For understanding macroscopic foam properties, it is... -
Marie Plazanet (Laboratoire Interdisciplinaire de Physique)16/12/2025, 17:20
This study focuses into the molecular dynamics of the ternary ethanol-octanol-water mixture, selected for its well-defined structure across critical point fluctuations, pre-Ouzo, and Ouzo phases, with organization occurring on a mesoscopic scale of a few nanometers. Using a combination of Neutron Scattering, NMR, rheology, and classical
Go to contribution page
molecular simulations, we present a detailed description... -
Sandrine Lyonnard (CEA-IRIG)17/12/2025, 09:00
Combining modalities enables revealing the complexity of matter. After having learnt this lesson from Thomas Zemb while studying colloidal systems with him in the years 2000, i later applied it to completely different fields of research – the latter being the operando investigation of battery materials. In this talk i will emphasize the advantages and necessity of SAXS/SANS techniques coupled...
Go to contribution page -
Lorenzo Metilli (Laboratoire Léon Brillouin)17/12/2025, 09:20
Adding photocurable polymers to aqueous suspensions of cellulose nanocrystals (CNCs) preserves their structural organization after processing, as recently demonstrated for nanocomposites with gradient chiral nematic structure produced by membrane ultrafiltration and UV-curing [1]. Nevertheless,understanding the physiochemical interactions between the nonionic polymer (PEGDA) and the CNCs is...
Go to contribution page -
Cedric Gommes17/12/2025, 09:40
Models available for scattering data analysis are often specialized to one specific type of data. For examples, a wide array of form- and structure-factors have been developed for analyzing specifically elastic small-angle scattering of x-rays or neutrons (SAXS or SANS). However, when it comes to analyzing inelastic scattering data on the very same systems - say neutron spin-echo (NSE) data -...
Go to contribution page -
Peter Laggner17/12/2025, 10:40
A new thermo-structural picture of EVA, poly(ethylene-co-vinyl acetate), has been developed by combination of T-scanning SAXS (PDDF analysis), WAXS and DSC results. This expands and supersedes previous, widely accepted ‘lamellar’ models. The basic element is a ‘fringed micelle’ with crystalline PE-rich core and amorphous VA-rich matrix. The chain packing in the core features a...
Go to contribution page -
Dominik Horinek (University of Regensburg)17/12/2025, 11:00
Presumably simple solutions can show a variety of nanoscale aggregation structures. Ternary mixtures of three liquids, in which two show only partial mutual solubility, resemble different types of microemulsions even in the absence of classical surfactants. We present fully atomistic molecular dynamics simulations of octanol/ethanol/water mixtures, a typical representative of these...
Go to contribution page -
Caroline Silva (Visiting Scientist - ESRF)17/12/2025, 11:20
Antimicrobial resistance is rapidly increasing worldwide, calling for alternative strategies beyond conventional antibiotics. Silica nanoparticles (SiO₂ NPs) are promising nanocarriers, but their impact on bacterial dynamics at relevant length and time scales remains insufficiently understood. Here, we combine Ultra Small-Angle X-ray Scattering (USAXS) and X-ray Photon Correlation Spectroscopy...
Go to contribution page -
Fabienne Testard (CEA, UMR 3685 CEA_CNRS, NIMBE/LIONS Université Paris Saclay)17/12/2025, 11:40
In the context of nanomedicine, combining SAXS, SANS and cryoTEM is a powerfull methodology to probe the formation, aging in biological media and interactions of Drug nanoparticles with proteins. In this talk, I will illustrate from different examples of bioconjugates self-assembled nanoparticles, how this approach allowed us to link the nanoparticle’s structure, stability, and analgesic...
Go to contribution page -
Emanuel Schneck (TU Darmstadt)17/12/2025, 14:00
Adsorption of surfactants to fluid interfaces occurs in technological and daily-life contexts. The surfactant surface coverage $\Gamma$ governs interface characteristics like tension $\gamma$, viscoelastic properties, and the stability of thin foam films. Typical experiments merely yield the tension isotherm $\gamma(c)$, where $c$ is the bulk concentration. Parameter-based models of surfactant...
Go to contribution page -
Max Hohenschutz17/12/2025, 14:20
α-Keggin poyloxometalates (POMs) with low charge density, such as SiW12O404- interact strongly with non-ionic hydrated interfaces driven by a water-mediated driving force, called the chaotropic effect. In aqueous solution of hydroxypropylcellulose (HPC), this binding results in more than 100-fold increase in viscosity at millimolar HSiW-concentrations, and even induces gelation at higher...
Go to contribution page -
Marc Jamin (Université Grenoble Alpes)17/12/2025, 14:40
Rabies virus (RABV) generates membrane-less liquid organelles (Negri bodies) in the cytoplasm of its host cell, where genome transcription and replication and nucleocapsid assembly take place, but the mechanisms of their assembly and maturation remain to be explained. An essential component of the viral RNA synthesizing machine, the phosphoprotein (P), acts as a scaffold protein for the...
Go to contribution page -
Austin Hubley (ESRF)17/12/2025, 15:00
Bimetallic Janus nanocrystals result from integrating two distinct metals side-by-side into one single particle$^1$. This asymmetric arrangement allows the unique properties associated with each metal to be incorporated in tandem. When dispersed in an appropriate catalytic medium, such particles exhibit self-propulsion mediated by diffusiophoresis$^{2,3}$. Before these properties can be...
Go to contribution page -
Rodrigo Sanches Pires (European Synchotron Radiation Facility, ID02 beamline)17/12/2025, 16:00
Small-angle scattering (SAS) curve fitting is frequently posed as a rugged, high-dimensional optimisation problem. In many practical cases, closely similar I(q) profiles can be produced by markedly different parameter combinations, highlighting the challenge of parameter degeneracies. Satisfactory solutions are rarely achieved without imposing constraints or introducing prior assumptions about...
Go to contribution page -
Bruno Demé (Institut Laue-Langevin)17/12/2025, 16:20
There are many examples of synthetic and biomimetic lamellar organisations in surfactant and lipid systems, but there are only a few examples of such membrane multilayers in nature: the myelin sheet in vertebrates, stacked thylakoid membranes in photosynthetic organisms and the lamellar domains of the stratum corneum. Whether synthetic or natural, these examples have in common highly ordered...
Go to contribution page -
Guillaume Brotons (Université du Mans)17/12/2025, 16:40
A new-generation of synthetic bone scaffold is tailored using a bricks-and-mortar approach from bioactive glass nanoparticles BGNps and customized polymers (PLA, poly (lactic acid), the mortar). Used as synthetic implants for substitutive and regenerative therapies targeting mandibular osteoradionecrosis (ORM). To shed light on the mechanisms behind the formation of the hierarchical structure...
Go to contribution page -
Thomas Zemb (CEA/ICSM)17/12/2025, 17:00
Louis-George Gouy (1853–1926) discovered in the late 19th century that static light scattering exhibits intense scattering at 90 degrees. This phenomenon was related to back-scattering, and he was able to quantify it by comparing its intensity to the intensity of diffraction produced by the edge of a screen—the latter being the subject of most interest at the time.
Moreover, Gouy related...
Go to contribution page -
17/12/2025, 17:20
-
Antoine Simon (INRAe)
Elucidating how multicomponent surfactant formulations segregate into stable nanodiscs requires correlating neutron, X-ray and light scattering with the underlying thermodynamics. In this work, multimodal small-angle scattering provides a quantitative description of molecular segregation and size control in crystalline catanionic nanodiscs. Using a formulation combining cetyltrimethylammonium...
Go to contribution page -
Lukas Zeyffert
-
Annette Meister (Martin-Luther-Universität Halle-Wittenberg)
Certain amphiphilic copolymers form lipid-bilayer nanodiscs from artificial and natural membranes, thereby rendering incorporated membrane proteins optimal for structural analysis. Recent studies have shown that the amphiphilicity of a copolymer strongly determines its solubilization efficiency. This is especially true for highly negatively charged membranes, which experience pronounced...
Go to contribution page -
Paola Brocca (Università degli Studi di Milano)
The literature indicates that the water surface is negative even at bulk pH well below 7. Our instrument excites, and is able to detect, the capillary modes of macroscopic bubbles with oscillations of minimal amplitude. The surface undulations are amplified at resonance by e.m. waves of 0.2 - 20 V/cm, reaching figures in the range of 0.5-20 nm ($10^{-6}$ times the bubble size). The bubble...
Go to contribution page
Choose timezone
Your profile timezone: