A5004248358- Nanoparticles: synthesis and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Nanomaterials for catalytic reactions
- Catalytic Processes in Materials Science
- Laser-Ablation Synthesis of Nanoparticles
- Catalysts for Methane Reforming
- Spectroscopy Techniques in Biomedical and Chemical Research
- Metal complexes synthesis and properties
- Graphene and Nanomaterials Applications
- Catalysis and Oxidation Reactions
- Quantum Dots Synthesis And Properties
- Magnetism in coordination complexes
- Copper-based nanomaterials and applications
- Organometallic Compounds Synthesis and Characterization
- Carbon dioxide utilization in catalysis
- Nanocluster Synthesis and Applications
- Heat shock proteins research
- Bacterial biofilms and quorum sensing
- Crystal structures of chemical compounds
- Electrochemical Analysis and Applications
- CO2 Reduction Techniques and Catalysts
- Advanced Nanomaterials in Catalysis
- Bee Products Chemical Analysis
Palacký University Olomouc
2016-2025
Regional Centre of Advanced Technologies and Materials
2011-2021
Moravská Vysoká Skola Olomouc
2015
University Hospital Olomouc
2014
Charles University
2009
Florida Institute of Technology
2006
Czech Academy of Sciences, Institute of Physics of Materials
2006
A one-step simple synthesis of silver colloid nanoparticles with controllable sizes is presented. In this synthesis, reduction [Ag(NH3)2]+ complex cation by four saccharides was performed. Four were used: two monosaccharides (glucose and galactose) disaccharides (maltose lactose). The syntheses performed at various ammonia concentrations (0.005−0.20 mol L-1) pH conditions (11.5−13.0) produced a wide range particle (25−450 nm) narrow size distributions, especially the lowest concentrations....
In this first systematic study, we describe the influence of various surfactants and polymers on aggregation stability antibacterial activity silver nanoparticles (NPs) prepared by a modified Tollens process. The surfactant/polymer stabilizing effect was monitored using newly established method based titration aqueous dispersion NPs solution poly(diallyldimethylammonium) chloride (PDDA). process evaluated dynamic light scattering (DLS) UV/vis spectra measurements finally confirmed TEM. Among...
The controlled preparation of Au nanoparticles (NPs) in the size range 6 to 22 nm is explored this study. NPs were prepared by reduction tetrachloroauric acid using maltose presence nonionic surfactant Tween 80 at various concentrations control resulting NPs. With increasing concentration a decrease produced was observed, along with significant their distribution. size-dependent catalytic activity synthesized tested 4-nitrophenol sodium borohydride, decreasing nanoparticles. Eley-Rideal...
The use of nanoscaled materials is rapidly increasing, however, their possible ecotoxicological effects are still not precisely known. This work constitutes the first complex study focused on in vivo evaluation acute and chronic toxic limits silver nanoparticles (NPs) eukaryotic organism Drosophila melanogaster. For purpose this study, NPs were prepared form solid dispersion using microencapsulation method, where mannitol was used as an encapsulation agent. newly with a high concentration...
The resistance of bacteria towards traditional antibiotics currently constitutes one the most important health care issues with serious negative impacts in practice. Overcoming this issue can be achieved by using antibacterial agents multimode action. Silver nano-particles (AgNPs) are well-known substances showing such Therefore, AgNPs suitable candidates for use combinations order to improve their In work, a systematic study quantifying synergistic effects different modes action and...
In this work, a simple one-step method of silver nanoparticle (NPs) preparation with controlled size is introduced. Silver NPs were prepared by reduction [Ag(NH3)2]+ complex cation d-maltose in the presence low concentrations (1 × 10–10 mol/L to 1 10–7 mol/L) high-molecular-weight poly(acrylic acid) (PAA). This modification reaction results managing nanoparticles' range from 28 nm (the system without PAA) 77 (system highest used PAA concentration). The influences both nucleation process and...
In this initial study, the toxicity effect of silver NPs against a model unicellular eukaryotic organism Paramecium caudatum was studied. For purpose dialysis-based method adapted, which allowed preparation stable aqueous dispersions in various concentrations that were necessary for evaluation limits these particles. The obtained results demonstrate do not exhibit any action tested below concentration 25 mg·L−1 whereas ionic retains its even at 0.4 mg·L−1. Such considerable difference two...
Abstract When combined with nanomaterials, antibiotics show antibacterial activity against susceptible and resistant bacterial strains at significantly lower concentrations. Unfortunately, to date, no research study has examined the effect of antibiotic mode action mechanism resistance on effectiveness treatment nanomaterials. Therefore, in this review, we performed a thorough analysis critical evaluation previously published data related nanostructured materials targeted focus relationships...
Selenium nanoparticles (SeNPs) have recently attracted attention for their antimicrobial and anticancer activities. Nevertheless, use remains limited due to stability issues. The objective of this study is investigate the impact different reaction conditions (including reducing stabilizing agents, as well temperature) on water dispersion characteristics, stability, biological activity SeNPs. particle characteristics were controlled using sodium borohydride a strong agent ascorbic acid mild...
A one-step chemical reduction route towards silver colloid particles with controllable sizes ranging from 45 to 380 nm is reported in this article. Silver particles, prepared by the of [Ag(NH3)2]+ complex various reducing sugars, were characterised means transmission electron microscopy (TEM), dynamic light scattering (DLS) measurement particle size distribution, and UV-VIS spectroscopy. The concentration ammonia reaction mixture choice sugar are key parameters control size. Synthesised...
The in vitro study of antibacterial activity silver nanoparticles (NPs), prepared via modified Tollens process, revealed high even at very low concentrations around several units mg/L. These are comparable with ionic revealing same effect. However, such NPs did not show acute cytotoxicity to mammalian cells - this occurs higher than 60 mg/L silver, while the cytotoxic level is much more lower (approx. 1 mg/L). Moreover, exhibit ecotoxicity against eukaryotic organisms as Paramecium caudatum,...
The dopaminergic neural system is a crucial part of the brain responsible for many its functions including mood, arousal, and other roles. Dopamine key neurotransmitter this system, determination level presents demanding task needed deeper understanding processes, even pathological, involving part. In work, we present method fast analysis dopamine levels in samples cerebrospinal fluid mouse striatum. based on nanocomposite composed magnetite silver nanoparticles, whose surface modified with...
Maghemite-supported gold (nanocat-Fe–Au) nanocatalyst enables the oxidative esterification of aldehydes and reduction aromatic nitro compounds in benign medium.
Nanostructured materials with antibacterial activity face the same threat as conventional antibiotics - bacterial resistance, which reduces their effectiveness. However, unlike antibiotics, research into emergence and mechanisms of resistance to nanomaterials is still in its early stages. Here we show how Gram-positive Staphylococcus aureus Gram-negative Escherichia coli bacteria develop silver nanoparticles, resulting an increase minimum inhibitory concentration from 1.69 mg/L for S. 3.38...
A nanocatalyst comprising ultra-small palladium nanoparticles supported on nanodiamonds (ultra-small Pd/rNDs) was fabricated via a reduction of (II) salt oxidized nanodiamond. The prepared catalyst characterized using XRD, XPS, ICP-MS, AAS, and TEM/HRTEM techniques, including STEM-EDS chemical mapping, which revealed that the modified material is combination reduced nanodiamond decorated with nanoparticles. as-prepared well-characterized Pd rNDs displayed superb catalytic activity for...
Abstract In industrial applications, the potential of basalt fibre-reinforced polymer (BFRP) composite pipes as a compelling alternative to glass and carbon is recognized. Their high recyclability makes them viable option for aerospace, marine, automotive applications. this study, comparison made between mechanical properties virgin basalt–epoxy graphene-modified counterparts. To conduct experiments, pipe section specimens were prepared using flex grinding machine. Graphene nanoplatelets...