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Wyniki wyszukiwania dla: SYNTHETIC SURFACTANTS
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Applications of Alkanethiols in Organic Synthesis
PublikacjaThis manuscript is an update to the earlier Science of Synthesis contribution describing methods for the synthesis of alkanethiols. Thiols can be converted into sulfonic, sulfinic, sulfenic acid and their derivatives, sulfides, disulfides, polysulfides, sulfonium salts, and thiiranes, etc. These transformations are accomplished by nucleophilic displacement or addition, oxidation, condensation, or coupling reactions involving thiol...
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The prns butterfly synthesis in the FPGA
Publikacjaw pracy przedstawiono sprzętową implementację elementarnych obliczeń, określanych jako obliczenia motylkowe, dla splotu realizowanego z użyciem wielomianowego systemu resztowego(ang. polynomial residue number system - prns). obliczenia są wykonywane z zastosowaniem reprezentacji systemu diminished-1. opisano syntezę układu realizującego obliczenie motylkowe w środowisku xilinx w układzie virtex 4. podano również wymaganą ilość...
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Silanethiolates - synthesis, properties and structures.
PublikacjaW pracy wskazano podstawowe drogi syntezy oraz podano zwięzłą charakterystykę silanotiolanów - w większości związków kompleksowych posiadających jako główny ligand grupę silanotiolanową, na ogół (t-BuO)3SiS. Przy pomocy odpowiednio dobranych przykładów zilustrowano właściwości tych związków - wskazano ciekawsze elementy struktury molekularnej oraz specyficzne cechy spektralne.
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International Journal of Self-Propagating High-Temperature Synthesis
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Morphology control through the synthesis of metal-organic frameworks
PublikacjaDesignable morphology and predictable properties are the most challenging goals in material engineering. Features such as shape, size, porosity, agglomeration ratio significantly affect the final properties of metal- organic frameworks (MOFs) and can be regulated throughout synthesis parameters but require a deep under- standing of the mechanisms of MOFs formation. Herein, we systematically summarize the effects of the indi- vidual...
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Synthesis of Novel Arginine Building Blocks with Increased Lipophilicity Compatible with Solid-Phase Peptide Synthesis
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Microbe Cultivation Guidelines to Optimize Rhamnolipid Applications
PublikacjaIn the growing landscape of interest in natural surfactants, selecting the appropriate one for specific applications remains challenging. The extensive, yet often unsystematized, knowledge of microbial surfactants, predominantly represented by rhamnolipids (RLs), typically does not translate beyond the conditions presented in scientific publications. This limitation stems from the numerous variables and their interdependencies...
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Thermal stability of vanadium xerogel powder under different atmpshere
Dane BadawczeThe DataSet contains the results of the thermal behavior of the vanadium xerogel powder. The information about xerogel powder synthesis is described in the Journal of Nanomaterials.
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A review on recent advances in the application of biosurfactants in wastewater treatment
PublikacjaMicroorganisms produce a variety of non-conventional surface-active molecules, known as biosurfactants. The biosurfactants find diverse applications in the oil industry, agriculture, emulsifiers, and wastewater treatment, to name a few. Since they are produced from microbes, advantages such as biodegradability, lower toxicity, and environmental compatibility can be leveraged compared to the chemical surfactants. Recently, biosurfactants...
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Changes in heat of vanadium xerogel powder under different atmosphere
Dane BadawczeThe DataSet contains the DSC curves of the vanadium xerogel powder. The information about xerogel powder synthesis is described in the Journal of Nanomaterials.
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The Influence of Synthetic Oxygenates on Euro IV Diesel Passenger Car Exhaust Emissions
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Hydrogen assisted cracking of 2205 duplex stainless steel in synthetic sea water
PublikacjaThe cracking behavior of 2205 duplex stainless steels (DSSs) in synthetic sea water under cathodic polarization condition was investigated. (SSRT) method was employed in aim to evaluate the susceptibility to hydrogen assisted cracking. The results showed that the reduction in the uniform elongation (UEL) and the reduction of area (RA) varied with the applied cathodic current density. Significant reductions in ductility were found,...
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Synthetic Principles Determining Local Organization of Copolyesters Prepared from Lactones and Macrolactones
PublikacjaA highly effective and facile technique for catalytic ring-opening copolymerization (cROP) of lactones viz. ε- caprolactone and ε-decalactone with ω-pentadecalactone is being described. The reactions were mediated by Zn- and Cabased tridentate Schiff base complexes and benzyl alcohol as initiator. The catalysts were successfully employed for the preparation of numerous block and random copolymers. To unravel the composition of...
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CeCu2O4 as a functional layer on solid oxide fuel cells for synthetic biogas reforming
PublikacjaSolid Oxide Fuel Cells (SOFC) are one of the most promising electrochemical devices, which can convert chemical energy to the electrical energy these days. Their ability to work with different kind of fuel makes them noteworthy. SOFC can work with biogas. The problem arises when solid carbon starts to be deposited in anode. That leads to degradation of fuel cell. Simple solution is to apply catalytic functional layer, which is...
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Patterns of synthetic cathinones use and their impact on depressive symptoms and parafunctional oral behaviors
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The structure of novel polyurethanes containing synthetic poly[(R,S)-3-hydroxybutyrate]
PublikacjaThe aim of this study was to estimate the structure of new polyurethanes with the potential to be used in medicine. Atactic poly[(R,S)-3-hydroxybutyrate], obtained via a ring-opening polymerization, and polycaprolactonediol or polyoxytetramethylenediol were used to built the soft segments. 4,4'-methylene dicyclohexyl diisocyanate and 1,4-butanediol were the components to form hard segments. Polyurethanes with low-molecular weight...
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COMPLEXITY OF INNOVATIVE FINANCIAL PRODUCTS: THE CASE OF SYNTHETIC EXCHANGE TRADED FUNDS IN EUROPE
PublikacjaThe aim of the text is the presentation of the most important categories of exchange traded funds (ETFs) – physical and synthetic ones. A theoretical part of the text includes an overview of the main features of ETFs, the presentation of differences between physical and synthetic funds and the main risks posed by both types to their users and the whole financial systems. An empirical part focuses on the European market. Time span...
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Preeclampsia Risk Prediction Using Machine Learning Methods Trained on Synthetic Data
PublikacjaThis paper describes a research study that investigates the use of machine learning algorithms on synthetic data to classify the risk of developing preeclampsia by pregnant women. Synthetic datasets were generated based on parameter distributions from three real patient studies. Four models were compared: XGBoost, Support Vector Machine (SVM), Random Forest, and Explainable Boosting Machines (EBM). The study found that the XGBoost...
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Synthetic strategies in construction of organic low molecular-weight carrier-drug conjugates
PublikacjaInefficient transportation of polar metabolic inhibitors through cell membranes of eukaryotic and prokaryotic cells precludes their direct use as drug candidates in chemotherapy. One of the possible solutions to this problem is application of the ‘Trojan horse’ strategy, i.e. conjugation of an active substance with a molecular carrier of organic or inorganic nature, facilitating membrane penetration. In this work, the synthetic...
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Stability investigation of the PCM nanocomposites
PublikacjaIn present study was showed the results of research the stability of nanoPCMs in terms of types and concentrations of surfactant used. For stearic acid has been added PVP or oleic acid in concentrations of 0%, 5% and 10%. Nanoparticles TiO2 and Al-2O3 in concentration of 1% were chosen to be researched in this test. The mixing of nanocomposites has been done in an ultrasonic scrubber in which the samples were placed for 45 mins....
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Usuwanie hydrofobowych zanieczyszczeń organicznych z gleby metodą odmywania roztworami mieszanin surfaktantów cukrowych i gemini
PublikacjaZbadano wpływ surfaktantów gemini w mieszaninach z alkilopoliglukozydami na odmywanie heksadekanu z gleby. Dodatek surfaktantu gemini powodował wzrost usunięcia heksadekanu z gleby torfowej w stosunku do roztworów czystego Tritonu BG10. Największy wzrost efektywności uzyskano stosując hydrofilowe surfaktanty gemini Surfynole S465 i S485 w stężeniu 0,5 g/dm3. W przypadku gleby piaszczystej nie stwierdzono poprawy usunięcia heksadekanu...
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Adsorption properties of Triton X-100 and rhamnolipid biosurfactant in the contex of soil remediation
PublikacjaZbadano adsorpcję surfaktantu syntetycznego Triton X-100 i biosurfaktantu z grupy ramnolipidów oraz ich koadsorpcję na granicy faz powietrze/woda oraz olej/woda. Jako fazę organiczną wybrano dodekan oraz syntetyczny olej bazowy na bazie polialfaolefin (PAO). Te same surfaktanty użyto do zbadania zwilżalności powierzchni stałych pokrytych cieńką warstwą substancji hydrofobowej. Na podstawie badań fizykochemicznych nie zauważono...
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Can sodium 1-alkylsulfonates participate in the sodium dodecyl sulfate micelle formation?
PublikacjaThe aggregation behavior of sodium dodecyl sulfate (SDS) was studied in an aqueous solution in the presence of increasing concentrations of selected sodium 1-alkylsulfonates, namely sodium 1-octanesulfonate, sodium 1-decanesulfonate, and sodium 1-dodecanesufonate. The critical micelle concentration (CMC) of SDS was determined by conductivity and fluorescence intensity measurements. The steady-state fluorescence quenching experiments...
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Speech synthesis controlled by eye gazing
PublikacjaA method of communication based on eye gaze controlling is presented. Investigations of using gaze tracking have been carried out in various context applications. The solution proposed in the paper could be referred to as ''talking by eyes'' providing an innovative approach in the domain of speech synthesis. The application proposed is dedicated to disabled people, especially to persons in a so-called locked-in syndrome who cannot...
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Novel and Efficient Synthesis of Unsymmetrical Trisulfides
PublikacjaWe have developed a convenient method for the synthesis of unsymmetrical trisulfides under mild conditions in very good yields. The designed method is based on the straightforward preparation of 1-[(5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl)trisulfanyl]dodecane from readily available 5,5-dimethyl-2-sulfanyl-2-thioxo-1,3,2-dioxaphosphorinane, sulfur dichloride (SCl2) and dodecane-1-thiol. The unsymmetrical trisulfides can...
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Catalytic Asymmetric Synthesis of Isochroman Derivatives
PublikacjaThe isochroman scaffold constitutes an important structural unit, which is present in various bioactive natural products and synthetic pharmaceutical compounds exhibiting wide arrays of biological properties. Hence the synthesis of this class of heterocyclic compounds in a stereoselective fashion is highly significant and desirable. In the last decade, a substantial advancement has been witnessed ln the catalytic asymmetric...
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Algorithmic synthesis using Python compiler
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Serendipitous synthesis of trimetallic porphyrazine triads
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Azo and azoxythiacrown ethers: synthesis and properties
PublikacjaA series of 16- and 18-membered azo- and azoxythiacrown ethers have been synthesized by reductive macrocyclization of the respective bis(nitrophenoxy)oxaalkanes. The aromatic residues located in the polyether region of the molecule were introduced to macrocyclic skeletons and their affinities toward different groups of metal cations in ion-selective electrodes were described. X-ray structures for one dinitropodand and one azoxybenzothiacrown...
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Synthesis and reactivity of O-acyl selenophosphates
PublikacjaThe synthesis of several new O-acyl selenophosphates were investigated. The stability and reactivity of the products were studied and related to their structure.
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The possibility of use by-products for synthesis of emulsifiers
PublikacjaIn the last years the interest in use of materials originated from natural sources, e.g. vegetables to produce attractive products still grows. According to that, also the synthesis of these products should be adequate to the green chemistry requirements. The typical example observed in recent years focuses on utlization of bioglycerol - the by - product of global biodiesel manufacturing. The still growing production of biodiesel...
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Synthesis of coupled lossy resonator filters.
PublikacjaA technique for fast synthesis of coupling matrix low-pass prototypes of generalized. Chebyshev bandpass filters with lossy resonators is presented in this letter. The coupling matrix is found by solving a nonlinear least squares problem based on zeros and poles of filter's transfer functions.
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Melatonin in the skin: synthesis, metabolism and functions
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Hydrothermal and mechanochemical synthesis of crystalline CaCO3
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Widely parameterizable high-level synthesis
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A novel and efficient synthesis of unsymmetrical disulfides
PublikacjaOpracowano metodę otrzymywania niesymetrycznych disulfidów z odpowiednich tioli w oparciu o bromek sulfenylowy.
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Synthesis of acylpropyleneglycol emulsifiers in microemulsion system
PublikacjaBadano wpływ obecności surfaktantów anionowych i niejonowych na postęp reakcji estryfikacji glikolu propylenowego kwasem dodekanowym. Wyznaczono niektóre stałe kinetyczne procesu (rząd reakcji i stała szybkości reakcji).
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A General Synthesis of Diaryl Cyclic Diamidines
PublikacjaA convenient and general method has been developed for directly converting bis-nitriles, e.g., I, to cyclic diamidines, e.g., II, using reagents derived from diaminoalkanes, e.g., H2NCH2CH2NH2, satd. with hydrogen sulfide. A 1:1 mixt. of a diaminoalkane and Et alc. (or without) was effective in most cases (72-88%). The synthetic utility of this methodol. in the prepn. of tetrakis(cyclic amidino)pyrenes III (R = H, Me) from 1,3,6,8-tetracyanopyrene...
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Novel Azocoumarin Derivatives—Synthesis and Characterization
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Macromolecular Templates for Synthesis of Inorganic Nanoparticles
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Thiolate complexes of molybdenum. synthesis and application
PublikacjaZwiązki molibdenu, w tym siarczki, posiadają własności katalityczne i są szeroko wykorzystywane m.in. w przemyśle petrochemicznym. Enzym nitrogenaza posiadający w centrum aktywnym molibdenu umożliwia reakcję redukcji azotu atmosferycznego w niskiej temperaturze i pod ciśnieniem atmosferycznym. Ta sama reakcja w przemyśle wymaga zastosowania znacznie bardziej drastycznych warunków. Stąd wieloletnie zainteresowanie badaczy możliwością...
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Synthesis and properties of CaFe2As2 single crystals
PublikacjaOpisana została synteza i podstawowe właściwości fizyczne monokryształów CaFe2As2. CaFe2As2 krystalizuje w strukturze ThCr2Si2, stałe sieciowe wynoszą odpowiednio: a = 3.887(4) A and c = 11.758(23) A.
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Bis(azobenzocrown ether)s-synthesis
PublikacjaSyntezowano nowe związki bisazobenzokoronowe różniące się wielkością makropierścienia i długością łańcucha łączącego oba pierścienie makrocykliczne. Związki te wykorzystano jako jonofory w membranach klasycznych i miniaturowych elektrod jonoselektywnych. Przeprowadzono również badania dotyczące kompleksowania soli litowców i berylowców w roztworze acetonitrylowym z wykorzystaniem spektrofotometrii UV-VIS oraz zbadano strukturę...
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Synthesis of amides under microwave irradiation
PublikacjaAmides belong to the most important carboxylic acid derivatives. They are constituents of natural compounds like peptides and proteins. They found applications in many branches of science and industry, especially in pharmaceutical and polymer science. Conventional procedures for amide preparation involve reaction between amine and carboxylic acid or their more active derivatives such as acid chlorides, acid anhydrides or esters....
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Microwave radiation in the synthesis of urethane prepolymers
PublikacjaThis paper describes the use of microwave radiation in the synthesis of urethane prepolymers in bulk (without solvent). The prepolymers were synthesized using 1,6-hexamethylene diisocyanate (HDI) and poly (ε-caprolactone) diol (PCL) at a molar ratio of 4:1. The reaction was carried out without a catalyst in the reactor with a conventional heating system (oil bath) or in the microwave reactor (MW Reactor NOVA 09) at temperatures...
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Muramyl peptides - synthesis and biological activity
PublikacjaArtykuł przeglądowy opisujący syntezę i aktywność biologiczną muramylopeptydów.
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Fast synthesis of coupled-resonator filters.
PublikacjaZaproponowana została nowa, szybko zbieżna technika syntezy macierzy sprzężneń filtrów wykorzystujących rezonatory sprzężone. Metoda jest sformułowana jako nieliniowy problem najmniejszych kwadratów, optarty o zera i bieguny zwarciowej impedancji wejsciowej i wyjściowej oraz wartości własnych macierzy sprzężeń i jej podmacierzy.
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Synthesis and reactivity of O-acyl selenophosphates.
PublikacjaMieszane bezwodniki kwasów monoselenofosforowych >P(Se)O-C(O)- w zależności od podstawników na atomie fosforu oraz karbonylowym atomie węgla izomeryzują do układów Se-mostkowych >P(O)Se-(O)C- oraz ulegają dekarboksylacji (dekarbonylacji i dekarboksylacji) do estrów Se-alkilowych >P(O)Se-. W eksperymantach krzyżowych następuje wzajemna wymiana grup acylowych pomiędzy cząsteczkami bezwodników.
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Synthesis and reactivity of O-acyl selenophosphates
PublikacjaPrzeprowadzono syntezę nowych selenofosforanów acylu. Badano stabilność i reaktywność tych bezwodników w odniesieniu do ich struktury.
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Anthracenedione analogues - synthesis and biological activity
PublikacjaW artykule opisano syntezę i aktywność biologiczną analogów antracenedionowych.