Stéphane Isabettini

ORCID: 0000-0003-3416-8103
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About
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Research Areas
  • Lipid Membrane Structure and Behavior
  • Surfactants and Colloidal Systems
  • Liquid Crystal Research Advancements
  • Molecular Sensors and Ion Detection
  • Protein Interaction Studies and Fluorescence Analysis
  • Rheology and Fluid Dynamics Studies
  • Supramolecular Self-Assembly in Materials
  • Advanced Cellulose Research Studies
  • Enhanced Oil Recovery Techniques
  • Mesoporous Materials and Catalysis
  • Advanced Polymer Synthesis and Characterization
  • Electrostatics and Colloid Interactions
  • Polysaccharides and Plant Cell Walls
  • Material Dynamics and Properties
  • Food composition and properties
  • Microtubule and mitosis dynamics
  • Porphyrin and Phthalocyanine Chemistry
  • Microbial Metabolites in Food Biotechnology
  • Seed and Plant Biochemistry
  • Surface Modification and Superhydrophobicity
  • Photonic Crystals and Applications
  • Micro and Nano Robotics
  • Zeolite Catalysis and Synthesis
  • Advanced Materials and Mechanics
  • Metal-Organic Frameworks: Synthesis and Applications

ETH Zurich
2013-2020

For more than four decades, the design of zeolite base catalysts has relied on application aluminium-rich frameworks exchanged with alkali metal cations (preferably Cs+). However, moderate activity associated access and diffusion limitations, high manufacturing costs caesium content (typically over 30%) have hampered their industrial implementation so far. Herein, we discovered that high-silica USY zeolites outperform Al-rich counterparts in a variety base-catalysed reactions relevance fine...

10.1039/c3sc51937f article EN Chemical Science 2013-10-16

Nanocrystalline cellulose (NCC) is a promising material for formation of hydrogels and nematic liquid crystals. While salt addition known to facilitate hydrogel formation, it remains unclear whether this originates from cationic bridging or charge screening effects. Herein, we demonstrate the effect mono- divalent salts on NCC gelation ordering. A strong correlation suspension zeta-potential rheological behavior was found. Lower concentrations cations were needed decrease form hydrogels. The...

10.1021/acs.biomac.7b01119 article EN Biomacromolecules 2017-10-13

Controlling the assembly of colloids in dispersion is a fundamental approach toward production functional materials. Nanocrystalline cellulose (NCC) charged nanoparticle whose colloidal interactions can be modulated from repulsive to attractive by increasing ionic strength. Here, we combine polarized optical microscopy, rheology, and small-angle scattering techniques investigate (i) concentration-driven transition isotropic cholesteric liquid crystals (ii) salt-induced NCC phase transitions....

10.1021/acs.langmuir.9b00281 article EN Langmuir 2019-02-27

Wormlike micellar aggregates formed from the mixture of ionic surfactants with aromatic additives result in solutions impressive viscoelastic properties. These properties are high interest for numerous industrial applications and often used as model systems soft matter physics. However, robust simple models tailoring response solution based on molecular structure employed additive required to fully exploit potential these systems. We address this shortcoming a modified packing parameter...

10.1039/c7cp03891g article EN Physical Chemistry Chemical Physics 2017-01-01

Hydrogels delivering on-demand tailorable optical properties are formidable smart materials with promising perspectives in numerous fields, including the development of modern sensors and switches, essential quality criterion being a defined readily measured response to environmental changes. Lanthanide ion (Ln3+)-chelating bicelles interesting building blocks for such because their magnetic responsive nature. Imbedding these phospholipid-based nanodiscs magnetically aligned state gelatin...

10.1021/acsami.7b17134 article EN ACS Applied Materials & Interfaces 2018-02-20

External magnetic field is a powerful approach to induce orientational order in originally disordered suspensions of magneto-responsive anisotropic particles. By small angle neutron scattering and optical birefringence measurement technology, we investigated the effect on spatial ordering hybrid amyloid fibrils with different aspect ratios (length-to-diameter) flexibilities decorated by spherical Fe3O4 nanoparticles. A continuous paranematic from an initially isotropic suspension was...

10.1021/acs.biomac.6b00539 article EN Biomacromolecules 2016-06-15

Bicelles composed of DMPC and phospholipids capable chelating lanthanide ions, such as 1,2-dimyristoyl-sn-glycero-3-phospho-ethanolamine-diethylene triaminepentaacetate (DMPE-DTPA), are highly tunable magnetically responsive soft materials. Further doping these systems with cholesterol-DTPA conjugates complexed to a ion considerably enhances the bicelle's size magnetic alignability. The high value cholesterol for bicelle design remains largely unexplored. Herein, we examine how molecular...

10.1021/acs.langmuir.6b01968 article EN Langmuir 2016-08-16

Molecular engineering of lanthanide ion chelating phospholipids generating novel polymolecular assemblies with a switched magnetic susceptibility Δ<italic>χ</italic>and alignment direction.

10.1039/c7cp03994h article EN Physical Chemistry Chemical Physics 2017-01-01

Tuning the rheological properties of surfactant solutions by charge screening is a convenient formulation tool in cosmetic, household, oil recovery, drag-reduction, and thickening applications. Surfactants self-assemble water, upon core shielding, they grow into long wormlike micelles (WLMs). These are valuable model systems for soft matter physics, most explored hexadecyl-trimethylammonium bromide (CTAB) sodium salicylate (NaSal). Replacing NaSal with aromatic salts altered hydrophobicity...

10.1021/acs.langmuir.0c02608 article EN Langmuir 2020-12-28

Intermolecular interactions are responsible for the macroscopic properties of materials. Self-assembled micelles ionic surfactants in presence salt a result balance between hydrophobic-hydrophilic and forces. For example, sodium salicylate (NaSal) undoubtedly offers powerful means increasing viscoelasticity hexadecyl trimethylammonium bromide (CTAB) solutions by orders magnitude, which results from formation wormlike (WLMs). The efficiency this additive relies on its ability to integrate...

10.1063/1.5102110 article EN Physics of Fluids 2019-08-01

Ever-growing demand for gluten-free products calls the development of novel food processing techniques to widen range existing baked goods.

10.1039/c7fo01959a article EN Food & Function 2018-01-01

Generating lanthanide-chelating aminocholesterol-doped phospholipid bicelles with unprecedented magnetic alignment and tunable susceptibility.

10.1039/c7cp01025g article EN Physical Chemistry Chemical Physics 2017-01-01

Mixtures of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and its lanthanide ion (Ln3+) chelating phospholipid conjugate, 1,2-dimyristoyl-sn-glycero-3-phospho-ethanolamine-diethylene triaminepentaacetate (DMPE-DTPA), assemble into highly magnetically responsive polymolecular assemblies such as DMPC/DMPE-DTPA/Ln3+ (molar ratio 4:1:1) bicelles. Their geometry magnetic alignability is enhanced by introducing cholesterol the bilayer in DMPC/Cholesterol/DMPE-DTPA/Ln3+ 16:4:5:5). However,...

10.1021/acs.langmuir.7b00725 article EN Langmuir 2017-06-08

Cholesterol (Chol-OH) and its conjugates are powerful molecules for engineering the physicochemical magnetic properties of phospholipid bilayers in bicelles. Introduction aminocholesterol (3β-amino-5-cholestene, Chol-NH2) bicelles composed 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) thulium-ion-chelating 1,2-dimyristoyl-sn-glycero-3-phospho-ethanolamine-diethylene triaminepentaacetate (DMPE-DTPA/Tm3+) results unprecedented high alignments by selectively tuning susceptibility Δχ...

10.1021/acs.langmuir.7b01370 article EN Langmuir 2017-07-31

Bicelles are tunable disk-like polymolecular assemblies formed from a large variety of lipid mixtures. Applications range membrane protein structural studies by nuclear magnetic resonance (NMR) to nanotechnological developments including the formation optically active and magnetically switchable gels. Such technologies require high control assembly size, response thermal resistance. Mixtures 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) its lanthanide ion (Ln3+) chelating phospholipid...

10.3791/56812 article EN Journal of Visualized Experiments 2018-01-03

Bicelles are tunable disk-like polymolecular assemblies formed from a large variety of lipid mixtures. Applications range membrane protein structural studies by nuclear magnetic resonance (NMR) to nanotechnological developments including the formation optically active and magnetically switchable gels. Such technologies require high control assembly size, response thermal resistance. Mixtures 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) its lanthanide ion (Ln3+) chelating phospholipid...

10.3791/56812-v article EN Journal of Visualized Experiments 2018-01-03
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