A5084638950- Surfactants and Colloidal Systems
- Pickering emulsions and particle stabilization
- Lipid Membrane Structure and Behavior
- Proteins in Food Systems
- Material Dynamics and Properties
- Polymer Surface Interaction Studies
- Enhanced Oil Recovery Techniques
- Spectroscopy and Quantum Chemical Studies
- Electrostatics and Colloid Interactions
- Micro and Nano Robotics
- Minerals Flotation and Separation Techniques
- Cellular transport and secretion
- Supramolecular Self-Assembly in Materials
- Rheology and Fluid Dynamics Studies
- Inhalation and Respiratory Drug Delivery
- Antimicrobial Peptides and Activities
- Advanced Polymer Synthesis and Characterization
- RNA Interference and Gene Delivery
- Dendrimers and Hyperbranched Polymers
- SARS-CoV-2 and COVID-19 Research
- Atmospheric chemistry and aerosols
- Graphene and Nanomaterials Applications
- Hydrogels: synthesis, properties, applications
- Geophysical and Geoelectrical Methods
- Polydiacetylene-based materials and applications
Ikerbasque
2022-2025
Material Physics Center
2022-2025
Institut Laue-Langevin
2018-2024
Donostia International Physics Center
2024
Institute for Complex Systems
2023
National Academies of Sciences, Engineering, and Medicine
2023
Lund University
2023
Sapienza University of Rome
2023
RWTH Aachen University
2023
Institut Langevin
2020
Interfacial jamming and buckling of particle-coated bubbles can result in the arrest foam coarsening.
The hydrophobicity of a particle surface can be tuned by the addition surfactants that change free energy for their attachment to liquid interface. In this work, we report an experimental study where wettability properties silica nanoparticles are modified adsorption alkyltrimethylammonium (CnTAB, n = 12, 16) on particles. We have pointed out complexes is controlled intricate balance electrostatic and hydrophobic interactions between surfactant. These play important role in structure...
Abstract The relative wettability of oil and water on solid surfaces is generally governed by a complex competition molecular interaction forces acting in such three-phase systems. Herein, we experimentally demonstrate how the adsorption nature abundant divalent Ca 2+ cations to solid-liquid interfaces induces macroscopic wetting transition from finite contact angles (≈10°) with near-zero without cations. We developed quantitative model based DLVO theory that this transition, which observed...
Gram-negative bacteria are covered by both an inner cytoplasmic membrane (IM) and outer (OM). Antimicrobial peptides (AMPs) must first permeate through the OM cell wall before attacking IM to cause leakage kill bacteria. The bacterial is asymmetric bilayer with leaflet primarily composed of lipopolysaccharides (LPSs) phospholipids (PLs). Two cationic α-helical AMPs were designed target bacteria, a full peptide G(IIKK)3I-NH2 (G3), hydrophobic lipopeptide C8-G(IIKK)2I-NH2 (C8G2, C8 denoting...
Coronavirus disease-2019 (COVID-19), a potentially lethal respiratory illness caused by the coronavirus SARS-CoV-2, emerged in end of 2019 and has since spread aggressively across globe. A thorough understanding molecular mechanisms cellular infection coronaviruses is therefore utmost importance. critical stage fusion between viral host membranes. Here, we present detailed investigation role selected SARS-CoV-2 Spike peptides, influence calcium cholesterol, this process. Structural...
The interfacial properties of aqueous dispersions are strictly connected to the transfer/accumulation particles into surface layer, driven by particle hydrophobicity. addition surfactants adsorbing on and tuning their hydrophobicity represents therefore an attractive route control these liquid interfaces. These mixed systems present however rather complex behaviours, which still difficult understand, deserving both theoretical developments experimental investigations. Here results a wide...
Many physical properties of concentrated dispersions immiscible fluids are captured by the concept an osmotic pressure, which measures how much energy is required to deform bubbles or drops upon compaction. This pressure has a strong impact on flow and drainage behavior dispersions. Nevertheless, theoretical models describing its variation with volume fraction ϕ continuous phase so far available only in limits low high experimental data scarce. We report study foams emulsions, showing...
We report here a review of particle-laden interfaces. discuss the importance particle’s wettability, accounted for by definition contact angle, on attachment particles to fluid interface and how angle is strongly affected several physicochemical parameters. The different mechanisms interfacial assembly are also addressed, being adsorption spreading most widely used processes leading well-known adsorbed spread layers, respectively. steps involved in particle-surfactant mixtures from bulk...
PNIPAM microgel particles deform substantially upon adsorbing onto an air–water interface. The adsorption is initially controlled by the diffusion of to interface followed a slow exponential relaxation at long times.
The structural characterization of microgels at interfaces is fundamental to understand both their 2D phase behavior and role as stabilizers that enable emulsions be broken on demand. However, this usually limited by available experimental techniques, which do not allow a direct investigation interfaces. To overcome difficulty, here we employ neutron reflectometry, allows us probe the structure responsiveness in-situ air-water interface. We investigate two types with different cross-link...
As lateral compression is applied, microgel particles with different softness exhibit distinct behaviours. Hard microgels (green particles) are pushed away from the air–water interface, whereas soft ones (orange less deformed.
We have studied the surface shear viscoelasticity of poly(tert-butyl-acrylate) Langmuir monolayers spread at air/water interface, by tracking Brownian motion tracer particles with different sizes and chemical nature, trapped same interface. Surface moduli been extracted from mean square displacements (MSD), using approaches: hydrodynamic calculations drag coefficients direct inversion MSD means generalized Stokes–Einstein equation. It has found that these theoretical approaches lead to...
We address the rheology of assemblies surfactant-decorated silica nanoparticles irreversibly adsorbed at gas/liquid interface. Positively charged surfactant molecules (such as CTAB) bind to nanoparticle surfaces, and resulting particle-surfactant complexes adsorb interfaces. The control wettability such decorated their adsorption. interparticle forces can be tuned by changing concentration Cs. Increasing Cs, in addition a decrease particles wettability, leads an increase area fraction...
Summary Most solid surfaces acquire a finite surface charge after exposure to aqueous environments caused by desorption and/or adsorption of ionic species. The resulting electrostatic forces play crucial role in many fields science and technology, including colloidal stability, self-assembly, wetting, biophysics. Enhanced oil recovery (EOR) is an example large-scale industrial process that hinges respects on these phenomena. In this paper, we present series experiments illustrating...
By combining controlled experiments on single interfaces with measurements solitary bubbles and liquid foams, we show that poly(N-isopropylacrylamide) (PNIPAM) microgels assembled at air/water exhibit a solid to transition changing the temperature, this is associated change in interfacial microstructure of PNIPAM particles around their volume phase temperature. We behaves as soft 2D colloidal glass, existence solid/liquid offers an ideal platform tune permeability air covered by control...
Antimicrobial peptides are promising alternatives to traditional antibiotics. A group of self-assembling lipopeptides was formed by attaching an acyl chain the N-terminus α-helix-forming with sequence Cx-G(IIKK)yI-NH2 (CxGy, x = 4–12 and y 2). CxGy self-assemble into nanofibers above their critical aggregation concentrations (CACs). With increasing x, CACs decrease hydrophobic interactions increase, promoting secondary structure transitions within nanofibers. activity, determined minimum...
Biofouling, the undesired accumulation of microorganisms on surfaces exposed to aqueous environments, is primarily driven by bacterial adhesion and biofilm formation. It presents a significant challenge in various fields, especially biomedical applications such as tissue engineering, wound healing, medical devices. To develop effective antifouling solutions, it crucial understand mechanisms underlying biological attachment. For example, surface properties, hydrophobic/hydrophilic balance...
Studying biological membranes is essential for understanding key cellular processes such as signal transduction and ion transport, which have significant implications developing advanced therapies diseases like cancer cardiovascular disorders. However, the structural complexity of these presents challenges detailed analysis, necessitating techniques that are often incompatible with in-cell studies. As a result, current research has shifted toward fabricating artificial closely mimic their...
We address a systematic study of the three-phase contact angle, θ, microparticles at flat fluid−liquid interfaces by using different experimental methods. measured dependence θ not only on particle chemical composition and size, but also solvent used to spread onto fluid interface. found non-expected non-regular with nature spreading for particles studied. propose that these dependences are due porosity/roughness allows adsorption solid surface. This conclusion is supported values line...