A5050561511- Gold and Silver Nanoparticles Synthesis and Applications
- Pickering emulsions and particle stabilization
- Photonic Crystals and Applications
- Surfactants and Colloidal Systems
- Nanocluster Synthesis and Applications
- Phase Equilibria and Thermodynamics
- Lipid Membrane Structure and Behavior
- ZnO doping and properties
- Ion-surface interactions and analysis
- Gas Sensing Nanomaterials and Sensors
- Plasmonic and Surface Plasmon Research
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Electrostatics and Colloid Interactions
- Copper-based nanomaterials and applications
- Optical Coatings and Gratings
- Magnetic properties of thin films
- Material Dynamics and Properties
- Nanopore and Nanochannel Transport Studies
- Nonlinear Optical Materials Studies
- Advanced biosensing and bioanalysis techniques
- Fluid Dynamics and Thin Films
- Iron oxide chemistry and applications
- Polymer Surface Interaction Studies
- Advanced Sensor and Energy Harvesting Materials
HUN-REN Centre for Energy Research
2015-2024
Institute for Technical Physics and Materials Science
2010-2023
Budapest University of Technology and Economics
1999-2022
Hungarian Academy of Sciences
2007-2019
Monsanto (United States)
2016
HUN-REN Research Centre for Natural Sciences
2012-2015
Ludwig-Maximilians-Universität München
2011-2012
Budapest Institute
1982-2000
Eötvös Loránd University
1982-2000
Delft University of Technology
1995
The current state of the art in use colloidal methods to form nanoparticle assemblies, or clusters (NPCs) is reviewed. focus on two-step approach, which exploits advantages bottom-up wet chemical NP synthesis procedures, with subsequent destabilization trigger assembly a controlled manner. Recent successes application functional NPCs enhanced emergent collective properties for wide range applications, including biomedical detection, surface Raman scattering (SERS) enhancement,...
We explore a new application of optical tweezers for ultrasensitive detection sound waves in liquid media. Position tracking single gold nanoparticle confined three-dimensional trap is used to readout acoustic vibrations at power level down -60 dB, causing ∼90 μeV increase kinetic energy the nanoparticle. The unprecedented sensitivity such nanoear achieved by processing nanoparticle's motion frequency domain. concept developed here will enable us access interior biological microorganisms and...
Graphene covered metal nanoparticles constitute a novel type of hybrid material, which provides unique platform to study plasmonic effects, surface-enhanced Raman scattering (SERS), and metal–graphene interactions at the nanoscale. Such material is fabricated by transferring graphene grown chemical vapor deposition onto closely spaced gold produced on silica wafer. The morphology physical properties nanoparticle-supported are investigated atomic force microscopy, optical reflectance...
Ground fennel seeds were extracted with supercritical carbon dioxide. Small-scale subsequent extractions of the same sample showed that composition volatile compounds was changed extension extraction time and only principal components (limonene, fenchone, methylchavicol, anethole) present in last-extracted sample. Fennel oil successfully fractionated into essential rich fatty products pilot-scale apparatus using two separators series. Designed experiments carried out to map effects pressure...
Functionalized nanoparticles (NPs) can penetrate into living cells and vesicles, opening up an extensive range of novel directions. For example, NPs are intensively employed in targeted drug delivery biomedical imaging. However, the real-time kinetics dynamics NP–living cell interactions remained uncovered. In this study, we situ monitored cellular uptake gold NPs—functionalized with positively charged alkaline thiol—into surface-adhered cancer cells, by using a high-throughput label-free...
Extraction of pigments (chlorophylls and carotenoids) from marjoram (Origanum majorana L.) with supercritical carbon dioxide was investigated. The aim this study to map the effects extraction pressure temperature on yield coloring materials by applying a 32 full factorial design three repeated tests in center design. For comparison, laboratory pilot plant Soxhlet extractions were carried out using ethanol n-hexane solvents. compositions extracts determined HPLC. Similar amounts carotenoids,...
Stöber silica nanoparticles of diameter about 45, 60 and 100 nm different hydrophobicity are used to produce monolayers at a water–air interface. Both the surface pressure–area isotherms reflectivity angle incidence curves layers have been measured in Wilhelmy film balance. The contact as-prepared particles determined from by two evaluation methods, compared those obtained situ scanning reflectometry (SAR) measurements. SAR is proved be an effective tool for estimation angles on wettability,...
Low-molecular weight polyethylene glycol (PEG) has a lower critical solution temperature well outside the boiling point of water at ambient pressure, but it can be reduced high ionic strengths. We extend this concept to trigger clustering gold nanoparticles through control colloidal interactions. At strengths, low-molecular (<2000 Da) mPEG-SH-modified show with an increase in temperature. The decreases increasing strength. is attributed delicate interplay between strength and elevated...
The validity of various effective medium approximations (EMAs) (Bruggeman, Maxwell−Garnett) was studied for nanostructured systems, where the scale inhomogeneities is comparable to wavelength. Langmuir−Blodgett (LB) layers Stöber silica nanospheres diameters between 40 and 129 nm are excellent model structures experimental verification EMA methods in spectroscopic ellipsometry (SE) evaluation. Nanostructured mono- multilayered films were investigated by SE reflectance spectroscopy....
Abstract Microfluidic jetting is a promising method to produce giant unilamellar phospholipid vesicles for mimicking living cells in biomedical studies. We have investigated the chemical composition of membranes prepared using this approach by means Raman scattering spectroscopy. The all jetted are found contain residuals organic solvent decane used preparation initial planar membrane. inclusions randomly distributed over vesicle surface area and vary thickness from few several tens...
Abstract Cuprous oxide nanoparticles can be prepared with a great morphological control, and their composites gold nanostructures are intensively studied owing to catalytic performance. In this study, cuprous shell growth on nanosized prism‐shaped is investigated, where the core‐particle morphology does not match prototypical cubic or octahedral symmetry of embedding particle. It shown that different obtained depending reducing agent used for deposition. Strong (hydrazine) leads...
We present the studies on structure and optical properties of bidisperse Stöber silica nanoparticulate Langmuir films prepared at air/water interface in a Wilhelmy film balance transferred onto glass slides using Langmuir−Blodgett technique. Three different compositions (covered area ratios: 4:1; 1:1, 1:4) two systems were used experiments. Bidisperse samples (B1 B2) by mixing appropriate amount monodisperse sols particles with 61 100 nm diameters (B1) those 37 (B2). By surface pressure−area...
One of the main approaches for contact angle determination using sessile drops with a missing apex (e.g., because presence needle tip) is polynomial drop-profile fitting method. The major disadvantage this procedure that derived highly sensitive to order and number pixels involved in actual fit. In present work, an easily implementable method introduced effectively tackle these drawbacks. Instead itself, applied difference between drop profile circumcircle, independently both sides drop....
Decorating Cu 2 O nanooctahedra with small Au nanograins is a superior strategy to utilize photogenerated charge carriers without generating hot electrons. Photocatalytic activity in these heteronanoparticles improved even upon low-power excitation.