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Search results for: ANIONIC SURFACTANTS
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Ionization and ionic fragmentation of tetrahydrofuran molecules by electron collisions
PublicationElectron impact ionization and ionic fragmentation of tetrahydrofuran molecules in the gas phase were studied in the energy range from ionization threshold up to 150 eV using the technique of mass spectrometry. The cation mass spectra, ionization and ionic fragmentation efficiencies were measured over this energy range. Well-resolved mass peaks were detected in the mass range 10-72 amu and assigned to corresponding ionic molecular...
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Opportunities and shortcomings of ionic liquids in single-drop microextraction
PublicationThe synergistic combination of ionic liquids (ILs) and single-drop microextraction (SDME) involves a powerful coupling toward the development of sustainable analytical methodologies. This overview provides a survey of the literature regarding the IL-SDME, including a database on relevant physicochemical properties of ILs for their application in SDME, the strategies implemented to combine IL-based SDME methods efficiently with...
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Vacuum ultraviolet photoionization and ionic fragmentation of the isoxazole molecules
PublicationThe photofragmentation of the isoxazole molecules producing ionized atomic and molecular fragments was investigated in the photon energy range of 9e32 eV, using synchrotron radiation excitation combined with ion time-of-flight spectrometry. Twenty-one well resolved cations were identified in the mass spectra of the isoxazole, and their appearance energies were determined. The yield curves of these cations were obtained in the photon...
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Efektywność wymywania oleju syntetycznego z gruntu za pomocą roztworów surfaktantów w warunkach statycznych i dynamicznych
PublicationZbadano efektywność wymywania oleju z podłoża modelowego (piasku) w zależności od rodzaju surfaktantu jak i jego stężenia. Stosowano surfaktanty z grupy Rokanoli (NL6, NL8, L7, L10) oraz biosurfaktant JBR 425, który jest mieszaniną ramnolipidów. Jako zanieczyszczenie hydrofobowe wybrano syntetyczny olej bazowy typu polialfaolefin (PAO6).Stopień wymycia oleju bazowego PAO6 w warunkach statycznych, za pomocą roztworów surfaktantów,...
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Molecular picture of hydroxide anion hydration in aqueoussolutions studied by FT-IR ATR spectroscopy
PublicationHydratacja anionu hydroksylowego w wodnych roztworach wodorotlenków metali alkalicznych (LiOH, NaOH, KOH) została zbadana metodą spektroskopii oscylacyjnej FT-IR całkowitego wewnętrznego odbicia (ATR). Widma oscylacyjne wody dostarczają cennych informacji na temat stanu strukturalnego cząsteczek wody w sferach hydratacyjnych, wynikających ze sprzężeń oscylatorów w układzie. Wykazano, że drganie normalne rozciągające cząsteczki...
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Solid-phase microextraction and ion chromatographic analysis of anions based on polypyrrole electrode
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Interactions of dissolved dsDNA with intercalating drug by anodic voltammetry and spectroscopy. Influence of pH
PublicationOddziaływanie związku przeciwnowotworowego C-1305 z DNA było badane przy pomocy impulsowej voltametrii różnicowej oraz spektroskopii UV/Vis. Triazoloakrydon C-1305 oddziałuje z DNA na dwóch drogach: przez interkalacje pomiedzy pary zasad oraz przez wiązanie sie w małym rowku helisy. W fizjologicznym pH (7,4) stałe wiązania wynoszą: K1=3,36E+5 i K2=0,18E+5 [1/M] a wielkość miejsca wiązania: n1=2,5 i n2=4,0, odpowiednio dla pierwszego...
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Electron detachment energies in high-symmetry alkali halide solvated-electron anions
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An ab initio study on BeX3− superhalogen anions (X = F, Cl, Br)
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Spontaneous electron emission vs dissociation in internally hot silver dimer anions
PublicationReferring to a recent experiment, we theoretically study the process of a two-channel decay of the diatomic silver anion (Ag2-), namely the spontaneous electron ejection giving Ag2 + e- and the dissociation leading to Ag- + Ag. The ground state potential energy curves of the silver molecules of diatomic neutral and negative ion were calculated using proper pseudo-potentials and atomic basis sets. We also estimated the non-adiabatic...
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Morphology control through the synthesis of metal-organic frameworks
PublicationDesignable 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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Characterization of antimicrobial and hemolytic properties of short synthetic cationic lipopeptides based on QSAR/QSTR approach
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Impact of abiotic stressors on nutrient removal and rhizomicrobiome composition in floating treatment wetland with Equisetum hyemale
PublicationFloating treatment wetlands (FTW) are receiving growing interest as a phyto-technology. However, there are significant research gaps regarding the actual role of plant species and plant-microbiome interactions. In this study, the nutrient uptake of Equisetum hyemale was examined in FTW microcosms under the influence of abiotic stressors: As (3 mg/L) and Pb (3 mg/L) as well as Cl− (300 and 800 mg/L) in reference to a control during...
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Wykorzystanie dwuwymiarowej chromatografii jonowej do oznaczania anionów w próbkach butelkowanych wód leczniczych
PublicationWody lecznicze charakteryzują się specyficznymi właściwościami farmakodynamicznymi. Spowodowane jest to przeważnie wysoką zwartością wybranych składników mineralnych lub zawartością tzw. składników swoistych albo też odpowiednią ich proporcją. Ponieważ przynoszą ulgę w wielu chorobach, powszechnie stosowane są w sanatoriach i ośrodkach uzdrowiskowych. Coraz powszechniej są one również butelkowane i dostępne w sprzedaży detalicznej,...
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Are the short cationic lipopeptides bacterial membrane disruptors? Structure-Activity Relationship and molecular dynamic evaluation
PublicationShort cationic lipopeptides are amphiphilic molecules that exhibit antimicrobial activity mainly against Grampositives. These compounds bind to bacterial membranes and disrupt their integrity. Here we examine the structure-activity relation (SAR) of lysine-based lipopeptides, with a prospect to rationally design more active compounds. The presented study aims to explain how antimicrobial activity of lipopeptides is affected by...
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Exploiting isohexide scaffolds for the preparation of chiral ionic liquids tweezers
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Experimental study of the variations of the freezing points of ionic liquids in water
PublicationTemperatura zamarzania czystych soli alkiloimidazoliowych zawiera się w przedziale od - 70ºC do - 90ºC zależnie od długości podstawinika alkilowego oraz od rodzaju anionu. Celem niniejszej pracy jest znalezienie odpowiedniej metody pomiaru zmian temperatury zamarzania chlorku 1-metylo-3-oktyloimidazolu w wodzie. Wynik przeprowadzonych badań pozwolił na sporządzenie fragmentu diagramu fazowego dla wodnego roztworu chlorku...
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Chapter 23. Fate assessment of ionic liquids in porous media
PublicationW ostatnich latach obserwowany jest wzrost zainteresowania zastąpieniem tradycyjnych lubrykantów cieczami jonowymi z uwagi na ich szczególne właściwości fizykochemiczne zwłaszcza brak lotności -istotny z punktu bezpieczeństwa stosowania. Ciecze jonowe, choć nielotne, są związkami stosunkowo toksycznymi w stosunku do mikroorganizmów i bezkręgowców. Z tego względu ich zachowanie się w środowisku oraz parametry transportu powinny...
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Obtaining ionic forces by the total-energy tight-binding method
PublicationZastosowanie metody ciasnego wiązania w sformułowaniu nieortogonalnym do obliczania sił atomowych w symulacji metodą dynamiki molekularnej pozwala na stworzenie modelu charakteryzującego się lepszą przenośnością, w porównaniu z potencjałami empirycznymi, którymi posługuje się tradycyjna dynamika molekularna. W niniejszej pracy przedstawiono szczegółowo sposób obliczenia pochodnych elementów macierzy Hamiltona i macierzy nakładania...
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Chemical interaction between perovskite La0.6Sr0.4FeO3 and Super-Ionic Zr0.84Y0.16Ox
PublicationW pracy przedstawiono wyniki badań interakcji chemicznej pomiędzy materiałem perowskitowym LSF a materiałem superjonowym YSZ. Materiał superjonowy został wytworzony w niskiej temperaturze z użyciem prekusora polimerowego i zawiesiny proszku ceramicznego.W badaniach korzystano z spektroskopii rentgenowskiej.
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Recovery of ibuprofen from pharmaceutical wastes using ionic liquids
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The Relationship between the Structure and Properties of Amino Acid Ionic Liquids
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Moderately Reactive Molecules Forming Stable Ionic Compounds with Superhalogens
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Theoretical interpretation of photoelectron spectra of the iridium neutral atom and anion
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Simulation of solid state ionic conductors I-V characteristics
PublicationW pracy przedstawiono sumulacje charakterystyk prądowo-napięciowych czujników elktrokatalitycznych. Zastosowano metode różnić skończonych.
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Ionic transport in silica xerogels investigated by dynamic current voltagecharacteristics.
PublicationPodano wstępne rezultaty badania transportu ujemnych jonów w kserożelach Si02 w warunkach wysokiego gradientu temperatury w próbce, wywołanego jej ekstremalnie niską przewodnością cieplną. Uzyskane charakterystyki pozostają w zgodzie z przewidywaniami teoretycznymi. Na ich podstawie określono znak jonów, ich ruchliwość i energię aktywacji.
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Ionic thermoelectric effect in Cu2-δSe during phase transition
PublicationThe ionic Seebeck coefficient was studied in copper selenide with Cu1.99Se, Cu1.95Se and Cu1.8Se stoichiometry which was synthesized with a melt crystallization method. To measure the ionic Seebeck coefficient of copper ions, 0.15C6H12N4CH3I + 0.85CuI solid-state electrolyte was prepared. Electrolyte layers were pressed with copper selenide powder into a sandwich-like structure. At the temperature of 410 K, the materials have ionic...
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Chromogenic amides of pyridine-2,6-dicarboxylic acid as anion receptors
PublicationThe synthesis of simple, chromogenic pyridine-2,6-dicarboxylic acid amides, derivates of isomeric nitroanilines and aminonitrophenols, and their ion binding properties are described. The ligands' response to ionic species was examined by naked eye and was studied with the use of UV-Vis spectroscopy in DMSO and its mixture with water. The effect of the localisation and the type of the substituents in aromatic rings were discussed....
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Spectroscopic and photophysical properties of ZNTPP in a room temperature ionic liquid
PublicationThe steady-state absorption and emission spectra and the time-resolved Soret- and Q-band excited fluorescence profiles of the model metalloporphyrin, ZnTPP, have been measured in a highly purified sample of the common room temperature ionic liquid, [bmim][PF(6)]. S(2)-S(0) emission resulting from Soret-band excitation behaves in a manner completely consistent with that of molecular solvents of the same polarizability. The ionic...
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Ionic liquids as an example of lubricating oils used in a field of tribology
PublicationPodczas prezentacji ustnej pokazano przykłady cieczy jonowych, ich możliwości w wykorzystaniu jako zastąpienie tradycyjnie używanych dziś smarów. Ponadto dokonano porównania kilku właściwości "tribologicznych" między cieczami jonowymi a obecnie wykorzystywanymi smarami
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Wetting of supports by ionic liquids used in gas separation processes
PublicationCiecze jonowe są stosowane w procesach separacji gazów jako selektywne rozpuszczalniki. Są szeroko stosowane w technologii immobilizowanych membran ciekłych, głównie w procesach oczyszczania strumieni gazowych. Praca ta charakteryzuje komercyjnie dostępne membrany porowate używane we wspomnianych procesach. Określenie właściwości nośników i fazy membranowej ma na celu wyznaczenie czynników mających wpływ na stabilności takich układów...
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Effect of oxygenation time on signal of a sensor based on ionic liquids
PublicationThe paper presents an oxygen sensor based on ionic liquids and solid electrodes. The following ionic liquids have been employed: [BMIM][BF4], [HMIM][Cl], [BMIM][N(CN2)]. Minimum time of the sensor exposure to analyte, after which the signal (current intensity) was stable, has been evaluated. An impact of volumetric flow rate of analyte on the sensor exposure time and signal has been determined. A product of permeability coefficient...
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Temperature-dependent structure-property modeling of viscosity for ionic liquids
PublicationIn this paper we present the methodology for assessing the ionic liquids' viscosity at six temperature points (25, 35, 45, 50, 60 and 70 [C]), which utilizes only the in silico approach. The main idea of such assessment is based on the "correction equation" describing the correlation between experimentally measured viscosity and theoretically derived density (calculated with use of molecular mechanics), given at 6 different temperature...
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Prospects of ionic liquids application in electronic and bioelectronic nose instruments
PublicationThis paper addresses the problem of application of ionic liquids to chemical sensors and biosensors being an integral part of the electronic and bioelectronic-type instruments. The design and principle of operation of the electronic and bioelectronic noses are compared. Both the benefits and shortcomings of the application of ionic liquids in these type of instruments are described. The prospects of the development and application...
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Dissociative electron attachment and anion-induced dimerization in pyruvic acid
PublicationWe report partial cross sections for the dissociative electron attachment to pyruvic acid. A rich fragmentation dynamics is observed. Electronic structure calculations facilitate the identification of complex rearrangement reactions that occur during the dissociation. Furthermore, a number of fragment anions produced at electron energies close to 0 eV are observed, that cannot originate from single electron-molecule collisions....
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Photoresponsive, amide-based derivative of embonic acid for anion recognition
PublicationThe synthesis and ion-binding properties of amide-based derivative of embonic acid andp-aminoazobenzenewere described. The new compound was characterized by X-ray structural analysis and spectroscopic methods.Ligand interacts in acetonitrile with Y-shaped anions (benzoates and acetates) and dihydrogen phosphatesforming complexes of 1:1 stoichiometry. In more polar DMSO the complexes stoichiometry changes to 2:1(L:anion). Light-inducedtranstocisisomerization...
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How green are ionic liquids? – A multicriteria decision analysis approach
PublicationDue to various desirable physicochemical properties, ionic liquids (ILs) are still gaining in popularity. ILs have been recurrently considered green solvents. However, environmental, health and safety assessments of ILs have raised certain doubts about their benignness, and their greenness status is currently unclear. To clarify the situation on their greenness, we perform a comprehensive assessment of more than 300 commercially...
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Deep eutectic solvents vs ionic liquids: Similarities and differences
PublicationDeep eutectic solvents (DES) were introduced as an alternative to ionic liquids (IL) to overcome the drawbacks of IL solvents. However, some authors consider them to be a subclass of ILs. In contrast, other authors emphasize that these are by their nature independent, different groups of substances. Thus, the question arises: Which solvent group should DESs belong to? Maybe a new class should be added to the existing ones. The...
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Ionic liquids in the microextraction techniques: the influence of ILs structure and properties
PublicationIonic liquids (ILs) are composed entirely of ions thus they possess unique properties, including negligible volatility, a liquid state in a broad range of temperatures and ability to change them depending on the chosen type of anion and cation, which make ILs unique and useful for many applications in sample preparation techniques. A deeper understanding of the nature of ILs and the impact of their structure on their parameters...
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Effect of ionic liquids on surface and photocatalytic properties of selected semiconducttors
PublicationThe main aim of this doctoral dissertation was to explain the role of ionic liquids in shaping the morphology of selected semiconductors, thereby enhancing the photocatalytic activity. In order to achieve this goal, the following research steps were taken: (i) developing synthesis methods of selected semiconductors, with particular emphasis on the electrochemical oxidation method; (ii) understanding the influence of the selected...
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9-Cyano-10-methylacridinium hydrogen dinitrate
PublicationThe title compound, C15H11N2+·HN2O6−, crystallizes in the monoclinic space group C2/c with four molecules in the unit cell. The planar 9-cyano-10-methylacridinium cations lie on crystallographic twofold axes and are arranged in layers, almost perpendicular to the ac plane, in such a way that neighbouring molecules are positioned in a `head-to-tail' manner. These cations and the hydrogen dinitrate anions are linked through C—H⋯O...
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Relatively high-Seebeck thermoelectric cells containing ionic liquids supplemented by cobalt redox couple
PublicationMeanwhile no general and reliable equation determining the Seebeck coefficient (S e ) and involving electro-chemical reaction effects was derived for solutions. We reported the database of 15,000 ionic liquids supplemented by three different redox couple systems: 0.01 mol/l Co 3+/2+ (bpy) 3 , 0.01 mol/l I 3-/3I- and 0.2 mol/l 3- /3I- , and the corresponding estimated Seebeck coefficients. We also reported methods for estimating...
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Comparison of Ion Chromatography and Isotachophoresis for the Determination of selected Anions in Atmospheric Wet Deposition Samples
PublicationW pracy przedstawiono porównanie wyników oznaczenia zawartości wybranych anionów w próbkach opadów atmoferycznych z zastosowaniem technik izotachoforezy i chromatografii jonowej. Na podstawie otrzymanych wyników można stwierdzić, że technika chromatografii jonowej charakteryzuje się niższymi wartościami granic wykrywalności i oznaczalności, szerokim zakresem pomiarowym i możliwością oznaczania analitów w próbkach o róznym składzie...
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An ab initio study on MgX3− and CaX3− superhalogen anions (X=F, Cl, Br)
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Dipole-bound and dispersion-bound anions supported by the asymmetric tautomers of aminophosphine: H3NPH and HNPH3
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(MgO)n−(n=1–5)Clusters: Multipole-Bound Anions and Photodetachment Spectroscopy
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THE PERFORMANCE OF SELECTED AB INITIO METHODS IN ESTIMATING ELECTRON BINDING ENERGIES OF SUPERHALOGEN ANIONS
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The saturation of the excess electron binding energy in AlnF3n+1- (n= 1–5) anions
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BX4− and AlX4− Superhalogen Anions (X = F, Cl, Br): An ab Initio Study
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Bionic relations as features of the author’s original concept of biomorphic plastic forms that belong to a place
PublicationThe article concerns the search for an architectural formula for living organically in the area of Pojezierze Kaszubskie [the Kashubian Lake Dis- trict]. The original project consisted in creating a series of biomorphic plastic forms that belong to the place. In this way, a set of alternative solutions was created in the form of small clay sculptures that account for bionic relationships between the newly created cultural elements...