A5059918701- Mesoporous Materials and Catalysis
- Catalytic Processes in Materials Science
- Muon and positron interactions and applications
- Surfactants and Colloidal Systems
- Electrochemical Analysis and Applications
- Covalent Organic Framework Applications
- Photochemistry and Electron Transfer Studies
- Atomic and Subatomic Physics Research
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Arsenic contamination and mitigation
- Catalysts for Methane Reforming
- Advanced Nanomaterials in Catalysis
- Supercapacitor Materials and Fabrication
- Analytical Chemistry and Chromatography
- Adsorption and biosorption for pollutant removal
- Polymer Synthesis and Characterization
- Vitamin C and Antioxidants Research
- Chemical Reaction Mechanisms
- Free Radicals and Antioxidants
- Radiation Detection and Scintillator Technologies
- Chemical and Physical Studies
- Chemical Reactions and Mechanisms
- Nanomaterials for catalytic reactions
- Carbon and Quantum Dots Applications
Maria Curie-Skłodowska University
2013-2025
Charged lepton system symmetry under combined charge, parity, and time-reversal transformation (CPT) remains scarcely tested. Despite stringent quantum-electrodynamic limits, discrepancies in predictions for the electron-positron bound state (positronium atom) motivate further investigation, including fundamental tests. While CPT noninvariance effects could be manifested non-vanishing angular correlations between final-state photons spin of annihilating positronium, measurements were...
The present study focuses on the mechanism of swelling and evaluates interactions between solvents different chemical characters (polar—ethanol, nonpolar—n-heptane) commercially available porous Amberlite polymers (XAD4, XAD16, XAD7HP) by temperature-programmed desorption (TPD). first two are product copolymerization styrene divinylbenzene. Despite having same composition, they differ in pore size volume. XAD7HP is composed an acrylic matrix has lower volume specific surface area than XAD16...
The removal of soot particles via high-performance catalysts is a critical area research due to the growing concern regarding air pollution. Among various potential suitable for oxidation, cerium oxide-based materials have shown considerable promise. In this study, CeO2 samples obtained using range preparation methods (including hydrothermal synthesis (HT), sonochemical (SC), and hard template (TS)) were tested in combustion. They compared commercially available material (COM). All...
The research describes systematic approach to the novel synthesis and formation of a potential organic-inorganic drug carriers. poly(trimethylolpropane trimethacrylate) polymer-silica composites based on SBA-3 or SBA-15 mesoporous silica were fabricated by suspension-emulsion polymerization method in form small micrometric porous beads (specific surface area approx. 500 m2/g). type organic templates filling pores has proved be crucial composites. introduction diclofenac sodium via solvent...
In aqueous acid (pH <4) solutions, in the dark, and absence of reductants, arenediazonium ions, ArN 2 + decompose spontaneously through rate‐limiting formation extremely unstable aryl cation that reacts with any nucleophile present its solvation shell (D N A mechanism). However, weak acidic alkaline react H O OH − at terminal nitrogen to give azo adducts type are equilibrium parent . The diazohydroxide, this case an acid, is conjugate base, diazoate constant for reaction has been...
The article presents a cost-effective approach to the preparation of polymer-hybrid silica composites in form spherical beads, micrometer size, which are easy handle and completely water wettable. Taking into account swelling phenomenon Amberlite XAD7 HP resin, tetramethoxysilane [3-(2-aminoethylamino)propyl]trimethoxysilane were introduced polymeric particles with different molar fractions, was followed by their hydrolysis condensation vapor phase; as result polymer-amino-functionalized...
A new sandwich-type (silica–organic silica) composite in the form of spherical beads or irregular particles was prepared by condensation tetraethyl orthosilicate on hydrophobic Eurospher-100 C18 and LiChrosorb RP-18 particles. The silica–alkyl composites were characterised scanning electron microscopy, transmission atomic force nitrogen adsorption porosimetry, X-ray diffraction thermogravimetric analysis, combined with mass spectrometry. Experimental data indicate that long hydrocarbon...
This manuscript describes a simple yet meaningful demonstration that can be easily adopted by high-school teachers to emphasize some potential dangers associated with gas inhalation. The aims illustrate the undesirable effects of gases on living organisms employing freshly cut, colored flowers and ammonia gas. When in direct contact, causes abrupt, observable changes appearances flowers, leading their wilting, discoloration, or color fading. experiment carried out at any time within an...
Newly synthesized cerium oxide was successfully obtained by the hard templating route. The optimal As(III) and As(V) adsorption onto studied adsorbent reached for initial pH of 4.0 a contact time 10 h. highest static capacities were 92 mg g−1 66 g−1, respectively. pseudo-second-order model well fitted to experimental kinetics data. Langmuir described isotherms on material. mechanism ions complex should be further investigated. solid–liquid ratio during proposed aqueous extraction inorganic...
The comparison of pore size distributions obtained with the use two porosimetric methods: low temperature nitrogen sorption (LN2) and positron annihilation lifetime spectroscopy (PALS), was performed for porous silica monoliths.Four investigated samples were prepared under various synthesis conditions.Nitrogen showed presence bottle-shaped pores in all samples.In addition, it seems that methanol during influences porosity to a greater extent than organic additives.Quite good agreement...
Determining the association constants of radicals to biomimetic systems is not a simple task because inherent experimental difficulties associated their “in-situ” generation together with high chemical instability, requiring use radical trapping agents in combination with, for example, magnetic (eg, EPR) and/or time-resolved techniques frequency comb spectroscopy) indentify and quantify them. Here, we have exploited unique electrochemical properties arenediazonium ions, ArN2+, estimate...
The article demonstrates the series of silicas produced from various alkoxysilanes introduced into Amberlite® XAD7HP and lyophilized agar, whose transformation took place in presence ammonia vapors as catalyst. have been investigated by means up-to-date analytical methods for full characterisation solids including positronium annihilation lifetime spectroscopy. morphology silica is result specific conditions applied precursors transformation. Usage agar a template vapor-phase method does not...
In this paper the results of electrochemical oxidation propyl and lauryl gallates in various sodium dodecyl sulphate solutions using cyclic voltammetry method with a glassy carbon electrode are presented. The dependences peak current potential on surfactant concentration were determined aqueous buffer 1:1 v/v buffer+ethanol solutions, pH=4, 7, 11. On basis obtained effects pH, ethanol reaction kinetics discussed. distinct effect both is due to pH change from 4 7; lower higher value...