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Prof. Jeffrey Penfold (STFC)18/05/2022, 14:00Invited speaker
Home and personal care products, such as fabric and hair conditioners and shampoos, are often mixtures of di-alkyl chain ionic / nonionic surfactant mixtures. Such formulations exhibit a complex array of microstructures which affect their functionality, formulation, stability, reproducibility, and adsorption properties. It will be shown how small angle neutron scattering, SANS, has made...
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Fabienne Testard (CEA, UMR 3685 CEA_CNRS, NIMBE/LIONS Université Paris Saclay)18/05/2022, 14:30Invited speaker
In memory of Isabelle, I choose 4 projects realized with her to illustrate how SANS can be used to determine the structure and the kinetic evolution of self-assembled nanostructured hybrid materials. In mesostructured materials made of organic surfactant (CTAB) and inorganic materials (ZrO2), SANS kinetic experiments (with a stopped-flow coupled to SANS) permitted to identify the role played...
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Charles Dewhurst (ILL)18/05/2022, 15:00Invited speaker
In 2005 pressure from the scientific user community and strategic planning for instrumentation at ILL determined that additional Small-Angle Neutron Scattering (SANS) capacity and capability were required. Demand for SANS beamtime was (and still is!) sky-rocketing being the neutron technique with the most diverse scientific community from soft-matter, biology, physics, materials science and...
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Fabrice Cousin (Laboratoire Léon Brillouin, CEA)18/05/2022, 15:30Invited speaker
We all learn in textbooks that contrast variation is a unique possibility that makes SANS so powerful to probe the “extraordinary structure of ordinary things” in soft matter. But there is a clear difference between reading it and experiencing it by itself. As for my part, I discovered it the very first time I came in Grenoble during my pHD when I tried to probe the structural organization of...
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Dr Gregory Smith (ISIS Neutron and Muon Source)18/05/2022, 16:30Invited speaker
The surfactant sodium dioctylsulfosuccinate (Aerosol OT or AOT) is used widely, due to its versatility. It is soluble in water and in oils, and it is surface activity and can act as an emulsifier. There are hundreds of papers and patents every year that feature it. This amount of research provides ample opportunities to study AOT-containing formulations using scattering. Aerosol OT is...
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Annie BRULET (Laboratoire Léon Brillouin)18/05/2022, 17:00Invited speaker
Amphiphilic diblock copolymers self-assemble in water solution in stable and robust polymersomes (vesicles), which combined to a chemical design flexibility make them excellent candidates as drug or imaging agent carriers. The introduction of actuator in polymersomes and the engineering of their targeted cell adhesion are critical issues for the applications of disease imaging and therapy....
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Julian Eastoe (University of Bristol)18/05/2022, 17:30Invited speaker
Isabelle and I worked together for 20 years. In that time, we published 51 papers that have been cited over 1800 times. The talk will cover highlights from this collaboration including magnetic surfactants, ionic liquid microemulsions and the search for the Holy Grail in the field of surfactants.
Ionic liquid-in-oil microemulsions
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J. Eastoe$^\star$, S. Gold, S.E. Rogers, A. Paul, T.... -
Cecile Dreiss18/05/2022, 17:45Invited speaker
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Dirk Honecker19/05/2022, 09:00Invited speaker
Magnetic iron oxide nanoparticles offer unique magnetic properties attractive for data storage, spintronics, and biomedical applications. Disorder effects are ubiquitous for nanostructured materials and they crucially influence relevant parameters, like the relaxation dynamics and magnetic hyperthermia performance. Despite the technological relevance, a quantitative interpretation of these...
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Viviana Cristiglio19/05/2022, 09:30Invited speaker
The sample environment is a critical component of research programs in advanced materials, geological systems, biology, and energy-related applications.
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Over the past ten years, an increasing number of studies on liquid materials have been carried out thanks to container-free sample handling methods. Techniques based on aerodynamics or electromagnetic levitation have created new opportunities... -
Julian Oberdisse19/05/2022, 10:00Invited speaker
A few examples of experimental studies of soft matter systems will be presented to illustrate some aspects of the personal and scientific journey of Isabelle Grillo. I have met Isabelle for the first time almost twenty-five years ago in the Bombannes school, and since then a combination of geographic coincidence, common scientific topics – from surfactant systems to polymer nanocomposites -,...
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Anne-Laure Fameau (INRAE)19/05/2022, 11:00Invited speaker
Soft materials, such as foam and emulsion systems, which respond to external stimuli, are on the leading edge of materials research and have recently been of interest to many scientists, such as Isabelle Grillo. The macroscopic responsivity relies on the ability to react at microscopic or mesoscopic scales. Stimuli-responsive surfactants that can change their structure in response to a trigger...
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Olivier Diat19/05/2022, 11:30Invited speaker
Beyond electrostatic, the interaction of ions with their close environment depends on their hydration shell and the water dynamic in this environment. Non-negligible water mediated effects can indeed influence many physical chemistry processes such as cloud point, protein salting-in or out, bubble coalescence, the topology of bilayers... They are thus qualified of "ion specific".
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During the... -
Sylvain Prevost (Institut Laue-Langevin)19/05/2022, 12:00Invited speaker
In 2003, Isabelle Grillo published a highly publicized article on Le Pastis, analyzing with SANS the large-scale structure of droplets responsible for the famous milky appearance of this Mediterranean drink. At the same time, the seminal article of Vitale and Katz on the “Ouzo effect” appeared. These two references kindled an ever-growing field of applied and fundamental research. Isabelle...
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Guillaume Brotons (Le Mans Université, FRANCE)19/05/2022, 14:00Invited speaker
Isabelle was deeply fascinated by the beauty of many simple things, including unspoiled natural landscapes and the beauty of the self-assembly of amphiphilic molecules. To honor her memory and send her a wink, I will tell you a short light-hearted story where these two passions once met.
But before that, I would like to share with you some recent results that illustrate how self-assembly...
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Sarah Rogers (ISIS, STFC)19/05/2022, 14:30Invited speaker
Ionic liquids (ILs) are molten salts that are liquid at relatively low temperatures. They are composed of sterically mismatched ions that hinder crystal formation and are often defined as salts with melting temperatures below 100 °C, though many are liquid at room temperature and below [1].
Recently, there has been great interest in ILs as their unusual combination of properties, such as,...
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Mr Peter DOWDING (Infineum UK Limited, Milton Hill Business & Technology Centre, P.O. Box 1, Abingdon, OX13 6BD, UK)19/05/2022, 15:00Invited speaker
Additives are used in lubricant systems to minimise destructive processes in the engine (e.g. wear and corrosion) and to confer beneficial properties (e.g. more uniformed viscosity with temperature and improved fuel economy). Lubricant formulations typically up to 10 ingredients, comprising mixtures of amphiphilic species: surfactants, polymers, sols and inorganic salts dispersed in...
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Thomas Sottmann19/05/2022, 15:30Invited speaker
The journey together with Isabelle started 20 years ago in February 2000 at D22. The goal of these studies was to find the mechanism behind the dramatic enhancement of the solubilisation efficiency of ordinary surfactants obtained by adding only traces of amphiphilic diblock copolymers. Performing high-precision two-dimensional contrast variation SANS measurements [1] we could demonstrate that...
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Isabelle Morfin19/05/2022, 16:30Invited speaker
or how to do a very elegant and simple hand cream
To illustrate the title of Isa's tribute "the extraordinary structures of ordinary things", I will present Isa's latest personal research work in which I had the chance to participate. Her study focused on the structure of complex solutions obtained from essential oils, micelles of pluronic and from hyaluronic acid. Her goal was to make...
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Dr Olivia Pabois (University of Leeds)19/05/2022, 17:00Invited speaker
Regulating fat (dietary lipid) digestion to tackle the ongoing obesity crisis has become a pressing issue. Bile salts (BS) are biosurfactants produced in the liver and released into the small intestine, which play key roles in lipid digestion and absorption: they facilitate enzyme adsorption to fat droplet interfaces and remove insoluble lipolysis products from the interface, carrying them to...
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Prof. Sandra Ristori (Department of Chemistry & CSGI, University of Florence )19/05/2022, 17:30Invited speaker
Nanovectors are used for delivery purposes in many fields. First developed for biomedical and pharmaceutical applications, they have recently been extended to large scale processes and agriculture. Although soft matter materials such as lipids and polymers are generally considered biocompatibile, in recent times concerns have been expressed regarding the sustainability of the whole process...
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Michel Rawiso (Institut Charles Sadron (CNRS-UdS))20/05/2022, 09:00Invited speaker
The intrinsic stiffness of polyelectrolytes plays an essential role in the structure of their dense solutions and the ones of interpolyelectrolyte complexes.
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First, we will report SAXS and SANS experiments performed on dense aqueous solutions of highly charged polyelectrolytes that reveal the existence of an Onsager transition preceded by a new regime, both depending on the intrinsic stiffness... -
Jacques Jestin20/05/2022, 09:30Invited speaker
Knowing the refined structure of complex crude oils and the mechanisms of actions of these structures is of a central interest to understand and predict the behaviors of the petroleum fluids for many industrial applications: oil production, transportation and refining, enhanced oil recovery or gas sequestration. Crude oils are well known to be complex mixtures made of many different...
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Michael Gradzielski20/05/2022, 10:00Invited speaker
Self-assembled systems composed of surfactants, copolymers, and/or polyelectrolytes exhibit a large variety of different structures in aqueous solution that depend in a subtle way on the molecular structure of the components, the composition of mixtures, concentration, and external parameters such as pH, ionic strength, temperature, etc.
The formation of such self-assembled structures is...
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Pierre Levitz (CNRS)20/05/2022, 11:00Invited speaker
We had the privilege to collaborate time to time with Isabelle. We have been able to appreciate her exceptional scientific and human qualities. We had a common interest deciphering colloidal “portrait de phases” of mixed systems involving clay platelets and other partners such as magnetic spherical particles [1] or surfactant lamellar phases [2-3]. These works have paved the road to new...
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Jérôme Combet20/05/2022, 11:30Invited speaker
Polyelectrolytes (PEs) are polymers with ionisable groups that dissociate in water. This water-solubility is a remarkable property commonly used in industrial formulations (thickener, gel…). The presence of electrical charges opens up additional possibilities trough the formation of electrostatic complexes with oppositely charged species (colloids, surfactants, PEs, proteins…) leading to new...
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Prof. Werner Kunz (University of Regensburg)20/05/2022, 12:00Invited speaker
Most of the commonly used Ionic Liquids (ILs) contain bulky organic cations with suitable anions. With our COMPLET (Concept of Melting Point Lowering due to Ethoxylation), we follow a different approach. We use simple, low-toxic, cheap, and commercially available anions of the type Cx(EO)yCH2COO– to liquefy presumably any simple metal ion, independently of its charge. In the simplest case, the...
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Thomas Zemb20/05/2022, 12:30Invited speaker
Isabelle's Grillo PhD goal in 1998 was to explore the conditions and therefore the limits of mixing synthetic anionic clays and all known types of surfactant-based lamellar phases: anionic, nonionic and cationic.
Only a fraction of the conditions of mixing, including osmotic pressure compatibility, adsorption and depletion effects were understood at that time. Isabelle Grillo published...
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Thomas McCoy (University of Cambridge)
A diverse range of molecular surfactants and polymers have been incorporated into aqueous graphene oxide (GO) and reduced graphene oxide (rGO) dispersions in order to understand the complex relationship between surface chemistry, surface forces and interfacial thermodynamics of these materials with typical amphiphiles. Surfactant additives were systematically varied in terms of their charge...
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Mrs Nadine Schnabel (Institute of Physical Chemistry, University of Stuttgart)
The immobilization of molecular catalysts in confined geometries of mesoporous support materials has been shown to selectively control the catalytic performance. An additional increase in yield and selectivity of catalytic reactions are expected by combining the spatial confinement of the pores with that of a thin ionic liquid film at the pore surface. Small angle X-ray scattering (SAXS) can...
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Mr Maximilian Krappel (Institute of Physical Chemistry, University of Stuttgart)
By adding small amounts of amphiphilic diblock copolymers like poly(ethylene oxide)-co-poly(ethylene propylene) (PEO-PEP) to water – oil – non-ionic surfactant systems, Jakobs et al. showed that the efficiency of medium-chain surfactants to solubilize equal amounts of water and oil can be strongly increased (so-called efficiency boosting) [1]. In order to obtain a similar boosting while...
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Maëva Almeida (Université Paris Est Créteil, CNRS, ICMPE / Laboratoire Léon Brillouin, CEA Saclay )
With global warming, green chemistry has experienced a great development. In this context, fatty acids are surfactants of particular interest since they can be extracted from agricultural resources. The use of an organic counter-ion enables their solubilization in aqueous solution at room temperature where they self-assemble into different supramolecular structures.
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Stearic Acid (SA), one of... -
Leonardo Chiappisi
Whoever tried to prepare homemade mayonnaise, knows how much energy input the formation of water/oil emulsions require. In addition to that, in order to provide stability to the emulsion, the presence of components which stabilize the system are required. This role is played by some of proteins and the lecithin contained in the egg yolk, for the case of mayonnaise. In most of other emulsions,...
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Karina Abitaev (University of Stuttgart)
Using polymer particles templates to prepare porous materials is not only a cost-efficient strategy but offers the possibility of pore size and morphology control by the particle size and polydispersity. In this study, we investigated the influence of the sodium dodecyl sulfate (SDS) concentration utilized in the emulsion polymerization of styrene on both the properties of the obtained...
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Julian FISCHER (Universität Stuttgart)
Understanding and engineering the flow-response of complex fluids made by surfactant membranes is a key challenge for their practical utilization. Nevertheless, the predicted sponge-to-lamellar transition of self-assembled surfactant membranes upon shear flow [1] has, to our knowledge, only been shown for surfactant bilayers [2,3]. The lack of experimental reports of such a transition for the...
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François Boué (LLB)
Proteins – here dairy and plant proteins (the latter being environmentally advantageous), are crucial macronutrients, but they also structure food. They form structures at multiple spatial scales, in particular in gels. Those are prepared from milk at low pH or enzymatically, or from an isolate of cruciferin and napin from canola seeds by heating.
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To obtain structural information on digestion... -
Henrique Trevisan (ESPCI)
Sequence regulation can be assured by the selection of monomer couples with reactivity ratios close to zero, which allows spontaneous cross-propagation copolymerization. The specific control of the polymer backbone strongly impacts the physicochemical properties of polymer materials. For instance, monomer design and customization of the solvent–monomer interactions open the way to functional...
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Prof. Judith Peters (Université Grenoble Alpes)
Planet Earth is about 4.5 billion years old. In this study, we focused on the membranes of the first forms of living entities that assembled from a set of simple molecules available on the prebiotic Earth. The lipid membrane is a structure formed by hydrophobic or amphiphilic biomolecules called lipids, which are used in living organisms for many purposes, as a barrier between the interior of...
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Bruno JEAN (CERMAV-CNRS Grenoble)
Native cellulose nanocrystals (CNC-I) and nanocrystals of the allomorph II of cellulose (CNC-II) are biosourced colloidal rods that are very interesting building blocks for the design of innovative materials thanks to their inherent properties (renewable origin, biocompatibility, self-organization and mechanical properties, etc.). In sharp contrast with CNC-I, CNC II have only been discussed...
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Olga Matsarskaia
Elastin-like peptides (ELPs) are biomolecules mimicking the hydrophobic repeat units of elastin, a protein providing elasticity to biological tissues such as lung, ligaments and blood vessels. ELPs undergo a hydrophobic collapse upon crossing a lower critical solution temperature (LCST). Due to their stimulus-responsive properties, ELPs are of interest for a broad range of applications...
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Ms Jessica Bauhof (University of Stuttgart Physical Chemistry)
Chitin, which is mainly found in arthropods such as insects and crustaceans, is the second most abundant biopolymer besides cellulose.[1] Although about 1000 billion tons of chitin are produced in the biosphere every year, it is barely used to produce high-value products due to its difficult processability.[2] One promising approach to obtain such high-value products is the use of chitin...
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85. Tuning hydrogel properties by the addition of clay nanoplatelets and counterion specific effectsDr Natalie Malikova
Hydrogels are at the forefront of scientific attention especially in the biological and biomedical fields where they provide the basis for stimuli-responsive artificial tissues, vehicles for drug delivery or biosensors. We study physically crosslinked hydrogels based on ionenes, positively charged polyelectrolytes, for which strong counterion-specific effects have been observed previously [1]....
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