Ondrej Havelka

Technical University of Liberec | TUL · Center for Nanomaterials, Advanced Technologies and Innovations

The ongoing development of new nanocatalysts is powered by the ambitious vision of finely controlling their structure while ensuring their remarkable features in heterogeneous chemical reactions. Especially in processes where the catalysts must be recycled, the union of catalytic activity and magnetic motility belongs among the most desirable chara...

Freshwater scarcity is a persistent global problem and is frequently worsened by contamination with oils and oil-soluble contaminants. Although the technological union of microfiltration membranes and pollutant-degrading nanoparticles are up-and-coming solutions to eliminate oils from the aquatic environment, an utterly sustainable production proce...

Traditionally, the synthesis of nanomaterials in the ultra-small size regime (1–3 nm diameter) has been linked with the employment of excessive amounts of hazardous chemicals, inevitably leading to significant environmentally detrimental effects. In the current work, we demonstrate the potential of laser fragmentation in liquids (LFL) to produce hi...

In the current study, we explore the use of an eco-friendly laser-based methodology to fabricate Ag/TiO nanoparticles (NPs) with a highly controlled chemical composition, which serve to decorate the surface of Polyvinylidenefluoride (PVDF) nanofibrous membranes. Since these NPs can enhance the membranes’ oil-water separation performance and indepen...

Magnetic nanoparticles (NPs) are widely used as additives in magnetorheological (MR) suspensions to enhance their magnetic performance and kinetic stability. The synthesis of NPs is often resolved via chemical routes or complex manufacturing procedures, which require hazardous chemicals and generate waste products. In this study, a clean, laser-med...

The relatively new exploitation of nanoassemblies used for the recovery of clean water from oily emulsions has received a great deal of attention recently. Among the different innovations, nanofibrous membranes decorated with nanoparticles seem to be the most promising option due to their versatility, recyclability, and high oil/water separation pe...

TiOx nanoparticles are large bandgap materials that attract a great deal of attention for their use in light-powered applications. However, their utility is often restricted to employing energy from the ultraviolet (U.V.) or the second near-infrared solar spectrum region. In the current contribution, we expand the optical response of this material...

In the current paper, the production of homogeneous mixed nanocrystals based on Fe and Cu was successfully accomplished despite these two transition metals exhibiting extremely low miscibility in their phase diagram. The synthesis was carried out by the laser-mediated reduction of metal salts that were dissolved in different kinds of solvents, wate...