A5083226407- Surfactants and Colloidal Systems
- Electrostatics and Colloid Interactions
- Polymer Surface Interaction Studies
- Proteins in Food Systems
- Protein Interaction Studies and Fluorescence Analysis
- Lipid Membrane Structure and Behavior
- Pickering emulsions and particle stabilization
- Material Dynamics and Properties
- Rheology and Fluid Dynamics Studies
- Spectroscopy and Quantum Chemical Studies
- Fullerene Chemistry and Applications
- Carbon Nanotubes in Composites
- Blood properties and coagulation
- Enhanced Oil Recovery Techniques
- Dendrimers and Hyperbranched Polymers
- Microencapsulation and Drying Processes
- Advanced Polymer Synthesis and Characterization
- Surface Modification and Superhydrophobicity
- RNA Interference and Gene Delivery
- Protein purification and stability
- Inhalation and Respiratory Drug Delivery
- Polysaccharides Composition and Applications
- Oil Spill Detection and Mitigation
- Fluid Dynamics and Mixing
- Minerals Flotation and Separation Techniques
St Petersburg University
2016-2025
University of Florence
2004-2009
National Taiwan University of Science and Technology
2006-2009
Max Planck Institute of Colloids and Interfaces
1997
Pushkin Leningrad State University
1989-1991
The adsorption films of silica nanoparticles modified by a cationic surfactant (cetyltrimethylammonium bromide, CTAB) at the air–water interface were investigated dilational surface rheology and optical methods. Special attention was paid to slow changes properties with age. tension dynamic elasticity measured as function CTAB concentration. whole concentration range can be divided into four regions characterized different rheological behavior. Depending on concentration, close equilibrium...
Measurements of the surface dilational elasticity close to equilibrium did not indicate significant distinctions in conformation different forms bovine serum albumin (BSA) a broad pH range. At same time, protein denaturation layer under influence guanidine hydrochloride led strong changes kinetic dependencies dynamic if denaturant concentration exceeded critical value. It was shown that BSA unfolding at solution occurred lower concentrations than bulk phase. In former case, resulted...
We discuss different nonequilibrium mechanisms by which bulk aggregates directly modify, and can even control, the interfacial structure morphology of an oppositely charged polyelectrolyte/surfactant (P/S) mixture. Samples are categorized at air/water interface with respect to dynamic changes in phase behavior, composition, sample history using complementary surface-sensitive techniques. First, we show that spontaneously interact adsorption layer retained it this process occurs most readily...
The dynamic surface elasticity of mixed aqueous poly(styrenesulfonate)/alkyltrimethylammonium bromide solutions has been measured by the oscillating barrier, drop, and capillary wave methods as a function time surfactant concentration. At low concentrations (<0.3 mM) viscoelastic behavior is close to that relatively concentrated pure PSS solutions. classical Goddard et al. model cannot explain all experimental results in this concentration range, modification proposed. intermediate real part...
We describe a new methodology to prepare loaded polyelectrolyte/surfactant films at the air/water interface by exploiting Marangoni spreading resulting from dynamic dissociation of hydrophobic neutral aggregates dispensed an aqueous dispersion. The system studied is mixtures poly(sodium styrene sulfonate) with dodecyl trimethylammonium bromide. Our approach results in interfacial confinement more than one third macromolecules even though they are not surface-active without surfactant....
The impact of saturation and unsaturation in the fatty acyl hydrocarbon chain on physicochemical properties nanostructured lipid carriers (NLCs) was investigated to develop novel delivery systems loaded with an anticancer drug, ursolic acid (UA). Aqueous NLC dispersions were prepared by a high-pressure homogenization-ultrasonication technique Tween 80 as stabilizer. Mutual miscibility components at air-water interface assessed surface pressure-area measurements, where attractive interactions...
We demonstrate the ability to tune formation of extended structures in films poly(sodium styrenesulfonate)/dodecyltrimethylammonium bromide at air/water interface through control over charge/structure aggregates as well ionic strength subphase. Our methodology prepare loaded polyelectrolyte/surfactant from self-assembled liquid crystalline exploits their fast dissociation and Marangoni spreading material upon contact with an aqueous This process is proposed a potential new route cheap...
Silk fibroin (SF)-based materials attract significant interest because of their biocompability and great diversity possible morphologies. One the approaches to obtain SF is use an air-water or oil-water interface as a template for protein self-assembly. Surfactants can change surface properties adsorbed layers by promoting preventing formation fiber networks. This study focuses on influence two typical ionic surfactants, cationic cetyltrimethylammonium bromide (CTAB) anionic sodium dodecyl...
The damping coefficient and the length of transversal (at frequencies from 100 to 300 Hz) longitudinal 0.1 3 surface waves have been measured as a function concentration solutions poly(ethylene glycol)s (PEG) oxide) (PEO), molecular weight polymer. A local maximum has discovered for dilute PEG 400. This disappears decreases monotonically with polymers higher in region solutions. fast increase semidilute These experimental data are used calculation real imaginary components dynamic elasticity...
The dynamic surface elasticity, tension, and ellipsometric angles of mixed aqueous poly(diallyldimethylammonium chloride)/sodium dodecylsulfate solutions (PDAC/SDS) have been measured as a function time surfactant concentration. This system represents typical example polyelectrolyte/surfactant complex formation subsequent aggregation on the nanoscale. oscillating barrier drop methods sometimes led to different results. viscoelasticity PDAC/SDS are very close those sodium polystyrenesulfonate...
The nonmonotonic kinetic dependencies of the dynamic elasticity adsorbed and spread β-casein layers at liquid−gas interface have been determined by oscillating barrier method. While two local maxima in surface versus concentration dependence are well documented literature, these features not reported for curve. time range second maximum depended on bulk deviated from same pressures. In parallel to viscoelasticity PEO−PPO−PEO block copolymers, experimental findings can be explained a...
The dependence of the dilational surface elasticity on pressure spread monolayers polystyrene microparticles is studied at water–air interface. rheological measurements together with data from optical methods allow division whole range pressures into three zones characterized by different monolayer structures. extremely high (∼500 mN m−1) close to 30 m−1 similar results for adsorption layer complexes formed between silica particles and surfactant molecules probably caused strong hydrophobic...