Analysis Of Reaction Products Research Articles

A Versatile and Easy Method to Calibrate a Two-Compartment Flow Cell for Differential Electrochemical Mass Spectrometry Measurements.

Online techniques for the quantitative analysis of reaction products have many advantages over offline methods. However, owing to the low product formation rates in electrochemical reactions, few of these techniques can be coupled to electrochemistry. An exception is differential electrochemical mass spectrometry (DEMS), which gains increasing popularity not least because of its high time resolution in the sub-second regime. DEMS is often combined with a dual thin-layer cell (a two-compartment flow cell), which helps to mitigate a number of problems that arise due to the existence of a vacuum|electrolyte interface. However, the efficiency with which this cell transfers volatile reaction products into the vacuum of the mass spectrometer is far below 100%. Therefore, a calibration constant that considers not only the sensitivity of the DEMS setup but also the transfer efficiency of the dual thin-layer cell is needed to translate the signals observed in the mass spectrometer into electrochemical product formation rates. However, it can be challenging or impossible to design an experiment that yields such a calibration constant. Here, we show that the transfer efficiency of the dual thin-layer cell depends on the diffusion coefficient of the analyte. Based on this observation, we suggest a two-point calibration method. That is, a plot of the logarithm of the transfer efficiencies determined for H2 and O2 versus the logarithm of their diffusion coefficients defines a straight line. Extrapolation of this line to the diffusion coefficient of another analyte yields a good estimate of its transfer efficiency. This is a versatile and easy calibration method, because the transfer efficiencies of H2 and O2 are readily accessible for a large range of electrode-electrolyte combinations.

Alumina-embedded HZSM-5 with enhanced behavior for the catalytic cracking of biomass pyrolysis bio-oil: Insights into the role of mesoporous matrix in the deactivation by coke

The behavior of HZSM-5 zeolite embedded in γ-Al2O3/α-Al2O3 matrix in the catalytic cracking of biomass pyrolysis bio-oil was studied with special focus on the role of the matrix in the deactivation by coke. The runs were conducted at 450 ºC, space-time of 0.35 gzeolite.h.gfeed−1 and 0.5 h, 1 h, and 2 h on stream. The analysis of reaction products was conducted by in-line GC and GC/MS, and deactivated catalyst samples were extensively characterized by N2 physisorption, NH3-TPD, TPD-TPO, TPD-GC/MS and LDI FT-ICR MS. The alumina-embedded catalyst (Cat−Z30) exhibited greater stability, keeping the bio-oil conversion above 88 % for 0.5 h on stream, in comparison to the bulk HZSM-5 that deactivated rapidly entailing a bio-oil conversion plunge (from 95 % to 40 %). Consequently, the yield of gasoline-range hydrocarbons (> 70 % MAH monoaromatics) was boosted from 18 % to 26 % for the same reaction time. The aqueous liquid byproduct concurrently produced has a suitable composition for H2 production by further steam reforming. The enhanced behavior was caused by the weak-acid mesoporous structure of the matrix playing a dual function: i) diffusive-shell (inwards) role by promoting fragmentation/deoxygenation of bulky molecules (e.g., saccharides and guaiacols) into reactive oxygenates, and deposition of thermally-induced coke away from the zeolite micropores; ii) spread-growth (outwards) role by enhancing the diffusion of hydrocarbons outwards from zeolite crystals, and by promoting the development of heavy polycyclic structures that delay the blockage of active sites in micropores. The results are useful to progress towards the integral valorization of raw bio-oil, the development of active and stable catalysts, and the proposal of regeneration strategies necessary for the scaling up.

Investigation of tobacco straw pyrolysis: Three-parallel Gaussian reaction modeling, products analysis and ANN application

The pyrolysis behaviors, reaction kinetics, thermodynamic parameters, and reaction mechanism models of tobacco straw (TOS) were determined using a three-parallel Gaussian reaction model. The apparent activation energies for the pyrolysis of pseudo cellulose (P1-HE), hemicellulose (P2-CE) and lignin (P3-LI) pyrolysis were determined using the Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose, Starink, Tang, and Distributed Activation Energy Model model-free methods. The average apparent activation energies for P1-HE, P2-CE, and P3-LI were 153.67, 178.53, and 190.45 kJ/mol, respectively. The pyrolysis process was well described by the dimensional, order, diffusional, and power law reaction mechanism models. Twelve types of pyrolysis products, including benzenes, acids, phenols, furans, indoles, pyridines, hydrocarbons, pyrroles, ketones, alcohols, quinolines, and aldehydes, were identified as the main pyrolysis products. Combining Raman and SEM analyses, pyrolyzed biochar at 800 °C was suitable as a catalyst or catalyst carrier. An artificial neural network (ANN) was utilized to predict the thermal degradation behaviors of TOS pyrolysis, and the hyperparameters of the activation function were optimized. The best ANN model structure was ANN (5 *11 *1). This study provided theoretical and practical guidance for further rational utilization of TOS waste.

Purification and biochemical characterization of SM14est, a PET-hydrolyzing enzyme from the marine sponge-derived Streptomyces sp. SM14.

The successful enzymatic degradation of polyester substrates has fueled worldwide investigation into the treatment of plastic waste using bio-based processes. Within this realm, marine-associated microorganisms have emerged as a promising source of polyester-degrading enzymes. In this work, we describe the hydrolysis of the synthetic polymer PET by SM14est, a polyesterase which was previously identified from Streptomyces sp. SM14, an isolate of the marine sponge Haliclona simulans. The PET hydrolase activity of purified SM14est was assessed using a suspension-based assay and subsequent analysis of reaction products by UV-spectrophotometry and RP-HPLC. SM14est displayed a preference for high salt conditions, with activity significantly increasing at sodium chloride concentrations from 100 mM up to 1,000 mM. The initial rate of PET hydrolysis by SM14est was determined to be 0.004 s-1 at 45°C, which was increased by 5-fold to 0.02 s-1 upon addition of 500 mM sodium chloride. Sequence alignment and structural comparison with known PET hydrolases, including the marine halophile PET6, and the highly efficient, thermophilic PHL7, revealed conserved features of interest. Based on this work, SM14est emerges as a useful enzyme that is more similar to key players in the area of PET hydrolysis, like PHL7 and IsPETase, than it is to its marine counterparts. Salt-tolerant polyesterases such as SM14est are potentially valuable in the biological degradation of plastic particles that readily contaminate marine ecosystems and industrial wastewaters.

Correlation between Surface Reactions and Electrochemical Performance of Al2O3‐ and CeO2‐Coated NCM Thin Film Cathodes

AbstractDepositing ultrathin oxide coatings has been proven a successful approach to stabilize the surface of LiNixCoyMnzO2active cathode material in lithium‐ion batteries (LIB). The beneficial effect of Al2O3coatings arises at least partly from spontaneous reactions between coating and liquid electrolyte. However, it remains unclear if comparable surface reactions occur for other oxide coatings. One difficulty is the characterization of reaction products at the cathode–electrolyte interface due to the multi‐phase properties of composite cathodes. Here, thin films are utilized as model systems to correlate surface reactions with the performance of Al2O3‐ and CeO2‐coated nickel cobalt manganese oxides (NCM). Electrochemical characterization confirms that an Al2O3coating improves long‐term cycling stability, while CeO2‐coated thin films perform even worse than uncoated counterparts. The analysis of the surface reaction products using X‐ray photoelectron spectroscopy shows that both coatings are fluorinated upon contact with liquid electrolyte in agreement with thermodynamic considerations. The fluorinated Al2O3coating is stable during cycling, resulting in the improved cell performance. In contrast, the fluorinated CeO2coating changes chemical composition, facilitating corrosion of the NCM surface. The results demonstrate the importance of a detailed analysis of surface reactions to evaluate the suitability of ultrathin oxide layers as protective coatings for LIBs.

Degradation of Organic Methyl Orange (MO) Dye Using a Photocatalyzed Non-Ferrous Fenton Reaction

Removal of recalcitrant organic pollutants by degradation or mineralization from industrial waste streams is continuously being explored to find viable options to apply on the commercial scale. Herein, we propose a titanium nanotube array (based on a non-ferrous Fenton system) for the successful degradation of a model contaminant azo dye, methyl orange, under simulated solar illumination. Titanium nanotube arrays were synthesized by anodizing a titanium film in an electrolyte medium containing water and ethylene glycol. Characterization by SEM, XRD, and profilometry confirmed uniformly distributed tubular arrays with 100 nm width and 400 nm length. The non-ferrous Fenton performance of the titanium nanotube array in a minimal concentration of H2O2 showed remarkable degradation kinetics, with a 99.7% reduction in methyl orange dye concentration after a 60 min reaction time when illuminated with simulated solar light (100 mW cm-2, AM 1.5G). The pseudo-first-order rate constant was 0.407 µmol-1 min-1, adhering to the Langmuir-Hinshelwood model. Reaction product analyses by TOC and LC/MS/MS confirmed that the methyl orange was partially fragmented, while the rest was mineralized. The facile withdrawal and regeneration observed in the film-based titanium nanotube array photocatalyst highlight its potential to treat real industrial wastewater streams with a <5% performance drop over 20 reaction cycles.

Magnesium-Enhanced Reactivity of Boron Particles: Role of Mg/B2O3 Exothermic Surface Reactions

Boron offers great promise as a candidate fuel in high-energy composites as a result of its high gravimetric and volumetric energy content; however, its oxidation rate is limited by sluggish diffusion of reactive species across its low-melting oxide shell. On the other hand, Mg nanoparticles (NPs) have been shown recently to undergo fast oxidation following rapid vaporization (∼100 μs at high heating rates of ∼105 °C/s). This release of vapor-phase Mg can potentially be exploited to react exothermically (ΔHr = −420 kJ/mol) with the B2O3 layer of boron, inducing surface disrputions and promoting its combustion. In this paper, we explore this effect by evaluating Mg NPs as additive fuel to B/CuO nanoenergetic composites. We observe that incorporating Mg as an additive fuel in B/CuO composites results in a ∼6-fold enhancement in reactivity with a ∼60% reduction in burn time. Through thermal and reaction product analysis along with high-speed time-of-flight mass spectrometry (T-jump/TOFMS) and ignition characterization, we investigate the reaction mechanism of Mg/B2O3 particles as a simulant system for the interaction of Mg with the B2O3 shell of boron. These characterizations reveal that exothermic heterogeneous reactions occur between vapor-phase Mg and the molten B2O3 shell of boron at ∼500–650 °C. The role of these exothermic surface reactions in inducing surface modifications and reactivity enhancement of boron particles is discussed.

Practical Aspects in the Study of Biological Photosensitization Including Reaction Mechanisms and Product Analyses: A Do's and Don'ts Guide†.

The interaction of light with natural matter leads to a plethora of photosensitized reactions. These reactions cause the degradation of biomolecules, such as DNA, lipids, proteins, being therefore detrimental to the living organisms, or they can also be beneficial by allowing the treatment of several diseases by photomedicine. Based on the molecular mechanistic understanding of the photosensitization reactions, we propose to classify them in four processes: oxygen-dependent (type I and type II processes) and oxygen-independent [triplet-triplet energy transfer (TTET) and photoadduct formation]. In here, these processes are discussed by considering a wide variety of approaches including time-resolved and steady-state techniques, together with solvent, quencher, and scavenger effects. The main aim of this survey is to provide a description of general techniques and approaches that can be used to investigate photosensitization reactions of biomolecules together with basic recommendations on good practices. Illustration of the suitability of these approaches is provided by the measurement of key biomarkers of singlet oxygen and one-electron oxidation reactions in both isolated and cellular DNA. Our work is an educational review that is mostly addressed to students and beginners.

Reactivities of iron(IV)-oxido compounds with pentadentate bispidine ligands

The FeIVO complexes of bispidines (3,7-diazabicyclo[3.3.1]nonane derivatives) are known to be highly reactive oxidants – with the tetradentate bispidine, the so far most reactive ferryl complex has been reported and two isomeric pentadentate ligands also lead to very reactive high-valent oxidants. With a series of 4 new bispidine derivatives we now try to address the question why the bispidine scaffold in general leads to very reactive oxidants and how this can be tuned by ligand modifications. The study is based on a full structural, spectroscopic and electrochemical analysis of the iron(II) precursors, spectroscopic data of the iron(IV)-oxido complexes, a kinetic analysis of the stoichiometric oxidation of thioanisole by five different bispidine‑iron(IV)-oxido complexes and on product analyses of reactions by the five ferryl oxidants with thioanisole, β-methylstyrene and cis-stilbene as substrates.

Analysis of reaction products on hydroxyapatite created by tooth etchants with different compositions.

The purpose of this study was to investigate the reaction products formed by application of three tooth etchants to hydroxyapatite. Tooth etchants with three different compositions, designed for application to teeth before dental adhesive - " K-etchant GEL" (containing phosphoric acid), "Enamel Conditioner" (containing organic acids), and "Multi Etchant" (containing acidic monomer) - were applied to hydroxyapatite plates. Atomic force microscopy measurements revealed that Multi Etchant formed nano-sized particles on the hydroxyapatite. X-ray diffraction and Fourier transform infrared spectrometer analyses of the powdered hydroxyapatite indicated that Enamel Conditioner produced calcium tartrate whereas K-etchant GEL generated monetite. These results indicated that each etchant reacted with hydroxyapatite in a different way. Not only differences among the etching ability of etchants, but also differences in the reaction compounds they produce may influence bonding performance in clinical practice.

烤烟游离氨基酸与美拉德反应产物的相关分析

烤烟游离氨基酸与美拉德反应产物的相关分析

Steroid 17α-hydroxylase/17, 20-lyase (cytochrome P450 17A1).

Cytochrome P450 (P450) 17A1 plays a key role in steroidogenesis, in that this enzyme catalyzes the 17α-hydroxylation of both pregnenolone and progesterone, followed by a lyase reaction to cleave the C-20 land C-21 carbons from each steroid. The reactions are important in the production of both glucocorticoids and androgens. The enzyme is critical in humans but is also a drug target in treatment of prostate cancer. Detailed methods are described for the heterologous expression of human P450 17A1 in bacteria, purification of the recombinant enzyme, reconstitution of the enzyme system in the presence of cytochrome b5, and chromatographic procedures for sensitive analyses of reaction products. Historic assay approaches are reviewed. Some information is also provided about outstanding questions in the research field, including catalytic mechanisms and searches for selective inhibitors.

Abstract 1920: Liquid Chromatography/ High-Resolution Mass Spectrometric Analysis of Reaction Products From a Putative Bacterial Cyclooxygenase

Abstract 1920: Liquid Chromatography/ High-Resolution Mass Spectrometric Analysis of Reaction Products From a Putative Bacterial Cyclooxygenase

Cloning, expression, and characterization of two pectate lyases isolated from the sheep rumen microbiome.

Pectate lyases (Pels) have a vital function in degradation of the primary plant cell wall and the middle lamella and have been widely used in the industry. In this study, two pectate lyase genes, IDSPel16 and IDSPel17, were cloned from a sheep rumen microbiome. The recombinant enzymes were expressed in Escherichia coli and functionally characterized. Both IDSPel16 and IDSPel17 proteins had an optimal temperature of 60 ℃, and an optimal pH of 10.0. IDSPel16 was relatively stable below 60°C, maintaining 77.51% residual activity after preincubation at 60°C for 1h, whereas IDSPel17 denatured rapidly at 60°C. IDSPel16 was relatively stable between pH 6.0 and 12.0, after pretreatment for 1h, retaining over 60% residual activity. IDSPel16 had high activity towards polygalacturonic acid, with a Vmax of 942.90 ± 68.11, whereas IDSPel17 had a Vmax of only 28.19 ± 2.23μmol/min/mg. Reaction product analyses revealed that IDSPel17 liberated unsaturated digalacturonate (uG2) and unsaturated trigalacturonate (uG3) from the substrate, indicating a typical endo-acting pectate lyase (EC 4.2.2.2). In contrast, IDSPel16 initially generated unsaturated oligogalacturonic acids, then converted these intermediates into uG2 and unsaturated galacturonic acid (uG1) as end products, a unique depolymerization profile among Pels. To the best of our knowledge, the IDSPel16 discovered with both endo-Pel (EC 4.2.2.2) and exo-Pel (EC 4.2.2.9) activities. These two pectate lyases, particularly the relatively thermo- and pH-stable IDSPel16, will be of interest for potential application in the textile, food, and feed industries. KEY POINTS: • Two novel pectate lyase genes, IDSPel16 and IDSPel17, were isolated and characterized from the sheep rumen microbiome. • Both IDSPel16 and IDSPel17 are alkaline pectate lyases, releasing unsaturated digalacturonate and unsaturated trigalacturonate from polygalacturonic acid. • IDSPel16, a bifunctional pectate lyase with endo-Pel (EC 4.2.2.2) and exo-Pel (EC 4.2.2.9) activities, could be a potential candidate for industrial application.

Varying the hydrophobicity of humic matter by a phase-transfer-catalyzed O-alkylation reaction

An O-alkylation reaction catalyzed by tetrabutylammonium hydroxide (TBAH) as a phase-transfer agent was applied to a humic acid (HA) to modify its hydrophobic properties. The carboxyl and hydroxyl functional groups of HA acted as nucleophiles in substitution reactions (Sn2) with methyl iodide, pentyl bromide and benzyl bromide added in amounts equimolar to 20, 60 and 80% of HA total nucleophilic sites. The occurrence of O-alkylation was shown by DRIFT spectrometry, NMR spectroscopy, High Performance Size Exclusion Chromatography (HPSEC) and elemental analysis of reaction products. DRIFT spectra showed changes in C–H stretching and bending regions following the insertion of methyl and pentyl groups, while the incorporation of benzyl groups revealed the characteristics aromatic C–H stretching bands. Both liquid- and solid-state NMR spectra revealed characteristic signals for alkyl/aryl esters and ethers. HPSEC chromatograms of alkylated materials invariably displayed an increase in hydrodynamic volume in respect to the original HA, thereby suggesting that the enhanced hydrophobicity conveyed further associations among humic molecules. Analytical, HPSEC and spectroscopic results suggest that benzylation was the most effective reaction at all percentages of HA total nucleophilicity, followed, in the order, by pentylation and methylation, The benzylation reaction was used to improve reaction and work-up conditions and show that HA could be efficiently alkylated also with substantial reduction of TBAH amount, with no THF addition, increase of reaction time and of washing cycles to remove catalyst impurities. These findings indicate that the hydrophobicity of humic substances can be modulated through a mild O-alkylation reaction under a phase-transfer catalysis according to the extent of exposed HA nucleophilic sites. Such a structural modification of humic matter may have multiple chemical, environmental and biological applications.

New fluorinated cyclophosphazenes: synthesis, properties, applications

The work presents the synthesis and characterization of fluorinated cyclophosphazenes, which are readily soluble in supercritical CO2 and can be used as textile finishing chemicals in a supercritical CO2 deposition process. The reaction of hexachlorocyclophosphazene with sodium alcoholate of 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octanol was performed. The reaction product analysis suggested that all parent hexachlorocyclophosphazene molecules participated in the reaction, 4- and 5-substituted fluorinated cyclophosphazene molecules comprised most of the reaction product. Cloud point measurements confirmed that the product is soluble in supercritical CO2 at moderate conditions. Fluorinated cyclophosphazene coating was deposited from solutions in supercritical CO2 onto cotton textile. Scanning electron microscopy revealed that the coating is deposited uniformly. The textile after treatment was hydrophobic with an initial contact angle of 106 ± 8 degrees. The obtained fluorinated cyclophosphazenes can be considered as building blocks for the further development of phosphazenes that are soluble in sc CO2 and can be used as hydrophobic finishing chemicals with improved properties.

Co-synthesis of zirconium boride/silicide/oxide composite powders by magnesiothermic reduction

This study uses a magnesiothermic reduction method to investigate the co-synthesis of zirconium boride, silicides, and oxide powder composites using ZrO2, B2O3, Si, and Mg initial powders. The synthesis of high-temperature ceramic powders is examined through milling durations, reduction temperatures, and excess magnesium addition. Thermochemical analysis of probable reaction products was conducted by the Factsage software. According to the results, the thermochemical predictions and resultant powder phases showed good coherency. High-energy milling has a significant effect on the formation of the zirconium boride phase after annealing. However, extended milling time and higher annealing temperature have no significant effects on the composition of the constituted composite powders according to the X-ray diffraction results. An annealing temperature of 600 ºC was enough to obtain ZrB2-based ceramic composite powders. In the final powder phases, the excess magnesium addition to the stoichiometric displays an important feature. After the milling, annealing, and leaching procedure, the stoichiometric powder composition comprises ZrB2, ZrSi, ZrSi2, ZrO2, and MgSiO2, and excess Mg added powders have the ZrB2, ZrSi, ZrSi2, ZrO2 phases in their structure. Scanning electron microscopy analysis was utilized to observe the morphologies of the powders throughout each step of the synthesis procedure and revealed the finely structured morphology of synthesized powders.

An experimental and modeling study on the oxidation of ammonia and n-heptane with JSR

The oxidation of neat ammonia, n-heptane, and ammonia/n-heptane blends was investigated both experimentally and numerically. Experiments were carried out in a fused silica jet-stirred reactor (JSR) under atmospheric pressure and lean conditions covering a temperature range of T=500–1200 K. Mole fraction profiles of 28 species were obtained with online SVUV-PIMS and GC techniques. A detailed analysis of reaction products and intermediates was performed, and the results were interpreted with an improved kinetic model, describing the oxidation of ammonia and n-heptane, as well as fuel interaction and NOx formation. The measurements indicate that ammonia reactivity is promoted by n-heptane addition at wide-ranging temperatures, while ammonia addition can also accelerate the oxidation process of n-heptane, especially at intermediate temperatures, manifesting mutual reinforcement in oxidation reactivity. Kinetic analysis shows that the low-temperature reaction of n-heptane generates reactive species that initiate and interact with the oxidation of ammonia along the pathway of NH2→H2NO/HNO→NO→NO2 at low temperatures. As the reaction pathway changes with increasing temperature, n-heptane oxidation likely provides the radical pool necessary to trigger ammonia oxidation through H2O2 decomposition at an intermediate temperature; while ammonia oxidation in turn accelerates the generation of hydroxyl radicals via NOx chemistry as a more direct pathway. As such, a self-reinforcing looping cycle could be formed, leading to the rapid oxidation of ammonia/n-heptane blends at intermediate temperatures. It is noted that despite the good overall performance, the kinetic model under-predicts NOx concentration and only qualitatively captures the rapid oxidation behavior. More kinetic modeling work is necessary in order to better understand the co-oxidation mechanism of ammonia and large hydrocarbons at wide-ranging operating conditions.

Synthesis of Al2O3/SiO2 core–shell composite abrasives toward ultrasmooth and high-efficiency polishing for sapphire wafers

A novel Al2O3/SiO2 core–shell composite abrasive was successfully synthesized via a facile sol–gel strategy and utilized to promote the surface quality and polishing efficiency of sapphire wafer. The silica shell with dense and amorphous structure was successfully coated on Al2O3 core. Its synthesis mechanism was discussed deeply, and good dispersibility and uniform particle size were obtained. The acquired core–shell composite particles were employed for the planarization machining of sapphire wafer. Results show that the decrease in surface roughness of Al2O3/SiO2 core–shell composite abrasives during polishing is more than 20.2% of that of pure Al2O3 abrasives, the material removal rate is more than 5.1% of that of pure Al2O3 abrasives, and the residual stress of the sapphire wafer finished by composite abrasives is decreased by approximately 40%. These results demonstrate that the Al2O3/SiO2 core–shell composite abrasives provide a more excellent polishing performance for the sapphire wafer, resulting in smoother and scratch-free surface with a higher material removal rate compared with pure Al2O3 abrasives. On the basis of the reaction product analysis and elastic-plastic micro-contact mechanics, the reasons for the improvement of polishing performance were revealed in terms of chemical corrosion and mechanical abrasion.

Synthesis of gaseous hydrogen and nanoparticles of silicon and silicon oxide by pyrolysis of tetraethoxysilane in an electric discharge under the action of ultrasound

In this work, we studied the process of synthesis of gaseous hydrogen, as well as silicon and silica nanoparticles under the action of intensive ultrasonic cavitation in a plasma discharge in a tetraethoxysilane medium.It is shown that a new form of plasma discharge arising in a liquid in an intensive ultrasonic field above the cavitation threshold, characterized by a volumetric glow in the entire space between the electrodes and falling volt-ampere characteristics, can be effectively used to initiate various physical and chemical processes. It was shown that ultrasonic action in combination with an electric discharge is capable to decompose tetraethoxysilane molecules with the formation of hydrogen, carbon oxides, and also solid-phase products - silicon and silica nanoparticles.Experiments on the production of hydrogen and nanoparticles were carried out on a special experimental setup for the implementation of a plasma discharge in liquid-phase media. The setup consists of an ultrasonic generator, a piezoceramic transducer, a discharge power source, a reaction chamber, and discharge electrodes.The results of the analysis of gaseous reaction products by gas chromatography show that during the pyrolysis of liquid tetraethoxysilane, hydrogen with a content of about 90% and carbon oxides are formed. The synthesized silicon and silica nanoparticles were isolated and studied using the methods of physicochemical analysis - infrared spectroscopy, X-ray phase analysis and transmission electron microscopy to determine the composition, shape and size of nanoparticles.The study of nanoparticles by electron microscopy showed that particles of a corner shape are obtained during the synthesis. The size of the synthesized nanoparticles is 50–100 nm. It was also shown by electron microscopy that, upon aggregation, the particles do not become larger in size, but form composite associates. It is also important to note that the advantage of this method for the synthesis of nanoparticles is their activated surface, which has a high reactivity as a result of exposure to intense ultrasound.The resulting nanoparticles and their agglomerates can also be used as functional materials, fillers, and components of composite materials.