A5014217268- Electrostatics and Colloid Interactions
- Nanoparticles: synthesis and applications
- Surfactants and Colloidal Systems
- Coagulation and Flocculation Studies
- Microplastics and Plastic Pollution
- Polymer Surface Interaction Studies
- Recycling and Waste Management Techniques
- Material Dynamics and Properties
- Heavy metals in environment
- Minerals Flotation and Separation Techniques
- Graphene and Nanomaterials Applications
- Geochemistry and Elemental Analysis
- Water Quality and Pollution Assessment
- Iron oxide chemistry and applications
- Protein Interaction Studies and Fluorescence Analysis
- Pickering emulsions and particle stabilization
- Selenium in Biological Systems
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanoparticle-Based Drug Delivery
- Electrochemical Analysis and Applications
- Environmental remediation with nanomaterials
- TiO2 Photocatalysis and Solar Cells
- Aquatic Ecosystems and Phytoplankton Dynamics
- Advanced Nanomaterials in Catalysis
- Lattice Boltzmann Simulation Studies
University of Geneva
2016-2025
Forel Klinik
2013-2024
Saveetha University
2024
Charles Humbert 8
2018-2021
John Wiley & Sons (United States)
2020
Hudson Institute
2020
Laboratoire de Sciences de la Terre
2016
HES-SO Genève
2016
Indiana University – Purdue University Indianapolis
2003-2006
Université de Montréal
2006
This paper describes several possible interactions among the different types of organic and inorganic aquatic colloids, based on our present knowledge their size, electric charge, conformation. The physicochemical properties groups colloids are described. Emphasis is placed various components, including fulvic compounds. Subsequently, role each colloid class discussed with respect to homoaggregation (aggregation within a given class) heteroaggregation types). On basis synthesis literature...
Selenium (Se) as one of the essential trace elements for human plays an important role in oxidation reduction system. But high toxicity Se limits its application. In this case, element with zero state (Se0) has captured our attention because low and excellent bioavailability. However, Se0 is very unstable easily changes into inactive form. By now many efforts have been done to protect stability. And work was conducted explore antioxidant capacities stable nanoparticles (SeNPs) stabilized...
The presence and accumulation of micro- nanoplastics in marine fresh waters represent a huge environmental concern.
In this study Granular Activated Carbon (GAC) used in drinking water treatment processes is evaluated for its capacity to adsorb and remove polystyrene (PS) nanoplastics. Batch experiments are conducted ultrapure surface from Lake Geneva, currently as resources. Equilibrium kinetic studies understand adsorption mechanisms limiting factors. Our results show that the removal of PS nanoplastics mainly due electrostatic interactions between positively charged negatively GAC. It found increases...
Silver nanoparticles (AgNPs) are increasingly used in various consumer products and industrial applications, raising concerns about their environmental impact on aquatic ecosystems. This study investigated the physicochemical stability, trophic transfer, toxic effects of citrate-coated AgNPs a freshwater food chain including diatom Cyclotella meneghiniana gastropod Lymnaea stagnalis. remained stable exposure medium, with minimal dissolution (<0.06%) after 24 h, indicating that particulate...
This work describes an improved version of the original OPLS-all atom (OPLS-AA) force field for carbohydrates (Damm et al., J Comp Chem 1997, 18, 1955). The improvement is achieved by applying additional scaling factors electrostatic interactions between 1,5- and 1,6-interactions. new model tested first improving conformational energetics 1,2-ethanediol, smallest polyol. With a 1,5-scaling factor 1.25 calculated relative energies are in excellent agreement with ab initio-derived data....
In this study, the zeta potential and z-average hydrodynamic diameter of zinc oxide (20 nm, 99.5% purity) were investigated as a function pH time. The nanoparticles readily formed aggregates could not be disintegrated to its primary size eventhough ultrasonication was applied. suspensions (25 mgL 100 mg/L) examined for electrophoretic mobility aggregation behaviour within range 3 11 time duration 60 minutes. particle measured by dynamic light scattering technique. application nanoparticle...
The contamination of aquatic environments by microplastics has been largely documented in the last years, especially oceans, rivers, and lakes, but their occurrence remote mountain lakes scarcely considered. This work aims to investigate presence abundance fibres a remote, alpine, uninhabited lake Switzerland (Sassolo). In this study, water column as well sediments were analysed. isolation from samples sediment was achieved with digestion process using H2O2 density separation technique NaI....
Heteroaggregation of engineered nanoparticles with suspended particulate matter in theory and practice: a roadmap for understanding determining attachment efficiencies.
Occurrence of microplastics and nanoplastics in aquatic systems, as well water compartments used to produce drinking have become a major concern due their impact on the environment public health. Nanoplastics particular, regard fate removal efficiency treatment plants (DWTP), which ensure quality supply for human consumption been, by far, rarely investigated. This study investigates polystyrene (PS) conventional plant providing 500'000 consumers. For that purpose, pilot-scale DWTP, located...
Although it is known that freshwater resources are contaminated with microplastics (MPs), still limited information about the efficiency of large drinking water treatment plants (DWTP) to remove microplastics. Moreover, reported concentrations MPs in variates from some units thousands per litre and sampling volumes used for analysis generally heterogeneous limited. The present study evaluates removal synthetic fibres main DWTP Geneva, Switzerland, by considering at different time intervals....
The complexation between a charged polymer and an oppositely spherical particle is investigated using Monte Carlo simulations. Electrostatic interactions are described in the Debye–Hückel approximation. influence of size ionic concentration on adsorption/desorption limit, interfacial structure adsorbed layer, amount polymer, overcharging issue investigated. Attention focused polyelectrolyte adsorption small particles whose surface curvature effects expected to limit monomers, large that...
The binding affinities of polyanions for bovine serum albumin in NaCl solutions from I = 0.01-0.6 M, were evaluated on the basis pH at point incipient binding, converting each such pH(c) value into a critical protein charge Zc. Analogous values mixed micelles obtained as cationic surfactant mole fraction Yc. data well fitted Yc or Zc KI a, and K considered function normalized polymer densities (tau), mobility, chain stiffness. Binding increased with flexibility expected simulations theory....
Complex formation between a weak flexible polyelectrolyte chain and one positively charged nanoparticle in presence of explicit counterions salt particles is investigated using Monte Carlo simulations. The influence parameters such as the surface charge density, valency, solution property pH on protonation/deprotonation process monomer adsorption at are systematically investigated. It shown that significantly modifies acid/base conformational properties. importance attractive electrostatic...
Intensive use of engineered nanoparticles (NPs) in daily products ineluctably results their release into aquatic systems and consequently drinking water resources. Therefore, understanding NPs behavior various waters from naturel to mineral is crucial for risk assessment evaluation the efficient removal during treatment process. In this study, impact relevant physicochemical parameters, such as pH, hardness, presence natural organic matter (NOM) on surface charge properties aggregation...
The presence of NPs in drinking water resources raises a global concern on their potential risk for human health, and whether or not treatment plants are able to effectively remove prevent ingestion by humans. In this study, we investigate the efficiency granular activated carbon (GAC), commonly used conventional municipal processes, removal CeO2 NPs. ultrapure water, found have good affinity GAC results indicate an increase adsorption capacity from 0.62 ± 0.10 5.05 0.51 mg/g, 35 % 4 54 5...
We used Monte Carlo simulations to study the formation of complexes between a flexible, semiflexible, and rigid polyelectrolyte an oppositely charged spherical particle. Polyelectrolyte adsorption on small particle, whose surface curvature effect is expected limit amount adsorbed monomers, was considered. focused effects intrinsic rigidity ionic concentration solution investigated adsorption/desorption conformation polyelectrolyte. controlled by several competing such as electrostatic...