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Tytuł:
Aminokwasowe ciecze jonowe
Amino acid ionic liquids
Autorzy:
Samaszko-Fiertek, Justyna
Sowińska, Kamila
Dmochowska, Barbara
Ślusarz, Rafał
Madaj, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/972296.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
ciecze jonowe
cholinowe ciecze jonowe
aminokwasowe ciecze jonowe
ionic liquids
choline ionic liquids
amino acid ionic liquids
Opis:
Ionic liquids (IL) are defined as compounds consisting only of ions with a melting point below 100°C. [1,2,4]. The first obtained ionic liquid was ethylammonium nitrate synthesized in 1914 by Paul Walden as a result of the protonation of ethylamine with nitric acid [4]. New group of IL are amino acid ionic liquids. They are non-toxic and bio- renewable ionic liquids of natural origin. The amino acids contain at least two functional groups, an amino group and a carboxyl group, which makes them both cationic and anionic in the amino acid ionic liquid. Amino acid ionic liquids attract more and more attention in the field of catalysis, as solvents in chemical transformations and cellulose solvents due to low production costs and their biodegradable. Compounds based on imidazolium, phosphonium, ammonium and choline ionic liquids found a wide application in biological sciences, modern chemistry and materials science [10]. One of their biggest advantages is the ability to absorb CO2 (especially their amino acid derivatives), which increases the chance of eliminating carbon dioxide from the environment. Amino acid ionic liquids have also found application in the field of catalysis.
Źródło:
Wiadomości Chemiczne; 2019, 73, 11-12; 737-751
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Ionic Liquids on growth of Escherichia coli strain possessing β-galactosidase activity
Autorzy:
Stobińska, M.
Urbański, D.
Bartkowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/115739.pdf
Data publikacji:
2013
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
ionic liquids
β-galactosidase
toxicity
Opis:
Ionic liquids (ILs) have gained a significant attention as alternative solvents in many chemical and biological reactions. ILs have evolved as a new type of non-aqueous solvents for biocatalysis, because they can stabilize and activate enzymes. Ionic liquids to be considered as so called “green solvents” should possess only very low or no toxicity to living organism and the environment. Currently, very little is known about the biotoxicity of ionic liquids. Within this paper a relative toxicity of two ionic liquids 1,3 dimethylimidazolium methyl sulfate [MMIM][MeSO4] and 1-hexyl-3-methylimidazolium chloride [HMIM][Cl]) on the growth of Escherichia coli (E.coli) was evaluated. In this study we focused on ionic liquids, which potentially could increase activity of β-galactosidase produced by selected strain of E. coli. The inhibition of cell growth in the presence of various ionic liquids was determined using both, solid and liquid cultures. Liquid culture was incubated in culture medium with different concentrations of ionic liquids (0.1, 1, 5, 10% (v/v)). Determination of the minimal inhibitory concentration (MIC50) of ionic liquids was based on monitoring of E. coli growth by optical density measured at 600 nm using densitometer. In the second method the solid culture plate with addition of various amount of ILs has been used. The number of colonies formed on the solid culture plate was converted to colony forming units (CFUs). The obtained results have confirmed, that prescreening based on cytotoxicity tests is a key element in selection procedure of ILs for any biotechnological processes based on application of microorganisms.
Źródło:
Challenges of Modern Technology; 2013, 4, 1; 38-40
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of ionic liquids with the tetrafluoroborate anion on terrestrial plants
Autorzy:
Biczak, R.
Pawłowska, B.
Tomczuk, K.
Feder-Kubis, J.
Powiązania:
https://bibliotekanauki.pl/articles/207364.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ionic liquids
tetrafluoroborate
ciecz jonowa
tetrafluoroboran
Opis:
Ionic liquids have attracted considerable interest as excellent alternatives to organic solvents to be used in homogeneous and biphasic processes. Ionic liquids are non-volatile, non-flammable and their “green” character has usually been justified with their negligible vapour pressure. However, the marketing of any chemical substance requires the determination of their impact on all elements of nature. Determination of the potential ecotoxicity of new chemical compounds is associated with conducting research on the effects of those compounds on the growth and development of selected organism. The phytotoxic properties of chiral ionic salts with the alkylimidazolium cation and the tetrafluoroborate anion were assessed for selected weeds popular in Poland: gallant soldier (Galinsoga parviflora Cav.), white goosefoot (Chenopodium album L.) and common sorrel (Rumex acetosa L.). It was found that 3-alkyl-1-[(1R,2S,5R)-(–)-menthoxymethyl]imidazolium tetrafluoroborates – ([C8-Im-Men][BF4]) and ([C9-Im-Men][BF4]) were low toxic to plants. A higher toxicity to terrestrial plants was characterized by ([C11-Im-Men][BF4]). The toxicity effect of compounds depended non only on the length of the alkyl chain in the function group but also on the concentration of the used compound and the type of plant which was sprayed with the tested compound.
Źródło:
Environment Protection Engineering; 2017, 43, 2; 41-52
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecotoxicity of ionic liquids as lubricants
Autorzy:
Kałdoński, T. J.
Kałdoński, T.
Załęska-Radziwiłł, M.
Pawlak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/244323.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ionic liquids
ecotoxicity tests
Daphnia Magna
Opis:
In this article there is discussed the influence of ionic liquids on natural environment on the basis of detailed analysis of the literature information and the results of the Authors' researches carried out within the framework of the development and research project no. PBR/15-249/2007/WAT-OR00002904 financed by Ministry of Science and Higher Education during 2007-2011. The literature information about toxic features of ionic liquids is very skimpy, but the detailed analysis of it and the results of our own researches allow us to say that not all ionic liquids should be treated as fully environmentally friendly substances. Among these substances, there are non-toxic and moderately toxic but there are very toxic liquids, too. Therefore, uncritical rating all ionic liquids among Green Chemistry is inappropriate. The test results of ionic liquids ecotoxicity were compared with the results obtained for standard oils used at lubrication technologies, particularly at motorization. All reference oils, according to EU classification, were non-toxic. The tests were carried out in accordance with OECD 202 European normative document, which recommends carrying out the tests for Daphnia Magna crustaceans. There were carried out: acute immobilization tests to Daphnia Magna, calculation of the effective concentrations EC50-t and evaluation of ionic and reference liquids toxicity with regard to used bioindicators
Źródło:
Journal of KONES; 2015, 22, 1; 135-142
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying of thermotropic liquid crystal phase and its influence on lubricity of ionic liquids
Autorzy:
Kałdoński, T. J.
Piecek, W.
Kałdoński, T.
Pawlak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/244373.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
mesophase identification
liquid crystals
ionic liquids
Opis:
In this article there is discussed a possibility of forming the liquid crystal structure in ionic liquids and its influence on performance characteristics, especially tribological, of these liquids. Formation of such thermal phase might influence on, among other things, easier creation of the boundary lubricating film, which is characterized by high viscous anisotropy. The results of tribological tests showed better lubricity of selected ionic liquids than modern PFPE oils. Identification of mesophase in ionic liquids was necessary. This method is described in the paper. Biolar PL polarizing interference microscope with thermal stabilizing table, with birefraction system, and Brüker Discover 8 powder diffraction instrument with a Cu lamp and monochromator were used. There was being searched the state characterized simultaneously by optical anisotropy properties and liquid state of aggregation. For identification of phase transition temperature, the additional calorimetric tests were carried out during the cycle of heating and cooling. These researches were carried out within the framework of the development and research project no. PBR 15-249/2007/WAT-OR0002904, financed by Ministry of Science and Higher Education during 2007-2011.
Źródło:
Journal of KONES; 2015, 22, 1; 143-156
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O cieczach jonowych „w pigułce” (historia, właściwości i rozwój)
Ionic liquids „in a nutshell” (history, properties and development)
Autorzy:
Pernak, J.
Rzemieniecki, T.
Materna, K.
Powiązania:
https://bibliotekanauki.pl/articles/1215325.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
ciecze jonowe
generacje cieczy jonowych
aktywność biologiczna
ionic liquids
generations of ionic liquids
biological activity
Opis:
Opisano najważniejsze zagadnienia związane z historią cieczy jonowych, ich nazewnictwem oraz właściwościami. Przedstawiono rodzaje cieczy jonowych, z uwzględnieniem kryteriów podziału, które pozwalają na analizę ewolucji tych związków na przestrzeni minionych dwudziestu lat.
The most important issues related to the history of ionic liquids, their nomenclature and properties have been described. The types of ionic liquids, including criteria for the distribution, which allow the analysis of the evolution of these compounds over the past twenty years have been presented.
Źródło:
Chemik; 2016, 70, 9; 471-480
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Br2 '-, BrSCN'- and (SCN)2'-intermediates in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide. Pulse radiolysis study
Autorzy:
Grodkowski, J.
Nyga, M.
Mirkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/147848.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ionic liquids
pulse radiolysis
Br2
Opis:
The reactions of Br2 '- anion radicals with thiocyanate anions in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide (R4NNTf2) were studied by pulse radiolysis. Reaction of solvated electrons with BrCH2CH2Br (DBE), k = (1 2)×108 L.mol 1.s 1, leads to the production of Br2'- anion radicals. The intermediate absorption spectra following pulse radiolysis of DBE/SCN-/Br-/ solutions in R4NNTf2 correspond to Br2 '-, BrSCNo- and (SCN)2'- anion radicals. The participation of these radicals in the spectra changes with progressing reactions and depends on the concentration Br- and SCN- in the solution.
Źródło:
Nukleonika; 2005, 50,suppl.2; 35-38
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Herbicydowe ciecze jonowe z anionem 2-(2,4‑dichlorofenoksy)propionianowym
Herbicidal ionic liquids with 2-(2,4-dichlorophenoxy) propionate anion
Autorzy:
Niemczak, M.
Kędzia, I.
Bartoszewska, Z.
Marcinkowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/1215349.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
ciecze jonowe
herbicydy
ochrona roślin
herbicydowe ciecze jonowe
2,4-DP
ionic liquids
herbicides
plant protection
herbicidal ionic liquids
Opis:
W niniejszej pracy opisano metodologię syntezy nowych herbicydowych cieczy jonowych (HILs) z kationem alkilo[2- (2-hydroksyetoksy)etylo]dimetyloamoniowym oraz anionem 2-(2,4-dichlorofenoksy)propionianowym. Dla otrzymanych związków przebadano wpływ długości łańcucha alkilowego w kationie na szereg właściwości fizykochemicznych takich jak gęstość, lepkość, współczynnik refrakcji czy rozpuszczalność. Ponadto, w badaniach szklarniowych na chwastach komosy białej (Chenopodium album L.) oraz chabra bławatka (Centaurea cyanus L.) określono ich aktywność chwastobójczą. Syntezowane ciecze jonowe wykazywały porównywalną lub wyższą aktywnością biologiczną w porównaniu z herbicydem referencyjnym. Zauważono, że długość podstawnika alkilowego w kationie ma wpływ na redukcję świeżej masy roślin. Najwyższą efektywnością charakteryzowały się sole zawierające podstawnik dodecylowy oraz tetradecylowy.
Here we present a synthesis methodology of novel herbicidal ionic liquids (HILs) with alkyl[2-(2-hydroxyethoxy)ethyl]dimethylammonium cation and 2-(2,4-dichlorophenoxy)-propionate anion. The effect of the alkyl chain length in the cation on the physicochemical properties such as viscosity, density, refractive index as well as solubility was determined. Additionally, the herbicidal efficacy was tested in greenhouse experiments by using common lambsquarters (Chenopodium album L.) and cornflower (Centaurea cyanus L.) as test plants. The studied HILs exhibited a similar or higher efficacy compared to the reference herbicide. It should be noted that the alkyl chain length in the cation influence on fresh reduction of plants. The salts with dodecyl and tetradecyl substituents were the most effective.
Źródło:
Chemik; 2016, 70, 9; 555-563
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of nanocellulose by hydrolysis with ionic liquids and two-step hydrolysis with ionic liquids and enzymes
Autorzy:
Babicka, Marta
Woźniak, Magdalena
Szentner, Kinga
Borysiak, Sławomir
Dwiecki, Krzysztof
Ratajczak, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/2154073.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
nanocellulose
ionic liquids
enzymes
nanoceluloza
ciecze jonowe
enzymy
Opis:
The aim of this study was to compare parameters of nanocellulose obtained by two different procedures: hydrolysis with ionic liquids (1-allyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate) and hydrolysis with ionic liquids in combination with hydrolysis using a cellulolytic enzyme from Trichoderma reesei. Avicel cellulose was treated with two ionic liquids: 1-allyl-3-methylimidazolium chloride (AmimCl) and 1-ethyl-3-methylimidazolium acetate (EmimOAc). In the two-step hydrolysis cellulose after treatment with ionic liquids was additionally hydrolyzed with a solution of enzymes. In order to characterize the obtained material, the following analyses were used: infrared spectroscopy, X-ray diffraction and dynamic light scattering. The results indicated that cellulose obtained by two-step nanocellulose production methods (first hydrolysis with ionic liquids and then with enzymes) showed similar parameters (particle size, XRD patterns and degree of crystallinity) as the material after the one-step process, i.e. hydrolysis with ionic liquids.
Otrzymywanie nanocelulozy poprzez hydrolizę cieczami jonowymi oraz hydrolizę dwuetapową cieczami jonowymi i enzymami. Celem pracy było porównanie parametrów nanocelulozy otrzymanej dwoma różnymi metodami: na drodze hydrolizy cieczami jonowymi (chlorek 1-allilo-3-metyloimidazoliowy i octan 1-etylo-3-metyloimidazoliowy) z hydrolizą cieczami jonowymi w połączeniu z hydrolizą enzymatyczną, przy użyciu enzymów celulolitycznych z Trichoderma reesei. Celuloza Avicel została potraktowana dwoma cieczami jonowymi: chlorkiem 1-allilo-3-metyloimidazoliowym (AmimCl) i octanem 1-etylo-3-metyloimidazoliowym (EmimOAc). W hydrolizie dwuetapowej, celuloza po obróbce cieczami jonowymi była dodatkowo poddana hydrolizie roztworem enzymów. W celu scharakteryzowania otrzymanego materiału zastosowano następujące analizy: spektroskopię w podczerwieni, dyfrakcję rentgenowską oraz dynamiczne rozpraszanie światła. Wyniki wykazały, że celuloza otrzymana w wyniku dwuetapowego procesu produkcji nanocelulozy (w pierwszej kolejności hydroliza cieczami jonowymi, a następnie enzymami) wykazuje podobne parametry (wielkość cząstek, strukturę nadcząsteczkową i stopień krystaliczności) jak materiał po jednoetapowym procesie - hydrolizie cieczami jonowymi.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2021, 116; 5--14
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogenation of cinnamaldehyde over supported palladium catalysts
Autorzy:
Wąsikowska, K.
Dmowska, P.
Bączek, N.
Strzelec, K.
Pernak, J.
Markiewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/778235.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
selective hydrogenation
supported catalyst
epoxy resin
ionic liquids
Opis:
The selective hydrogenation of cinnamaldehyde has been studied using palladium catalysts based on epoxy resin cured with ionic liquids. Characterization of palladium catalysts has involved the following methods: IR spectroscopy, X-ray photoelectron spectroscopy (XPS), AAS spectroscopy and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The investigated catalysts showed high stability and good recycling efficiency what makes them useful for a prolonged use. The factors influencing the selectivity of the supported catalysts were discussed.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 4; 28-32
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial studies on lubricity and surface properties of selected ionic liquids
Autorzy:
Kałdoński, T. J.
Stańczyk, M.
Gryglewicz, Ł.
Kałdoński, T.
Powiązania:
https://bibliotekanauki.pl/articles/244598.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
tribology
ionic liquids
surface tension
contact angle
lubrication
Opis:
The paper discusses the results of the studies on the surface properties and lubricating abilities of five ionic liquids compared to a high quality gear oil: Mobilube 1SHC 75W90 and two base oils: PAO-6 and SN-650. The investigated ionic liquids were: 1) tetrafluoroborate 1- benzyl-3-methylmidazolium, 2) bis (trifluoromethylsulfonyl) imide 3-methyl-1- propylpyridinium, 3) bis (trifluoromethylsulfonyl) imide 1,2-dimethyl-3-propylimidazolium, 4) bis (trifluoromethylsulfonyl) imide trihexyltetradecylphosphonium), 5) tetrafluoroborate trihexyltetradecylphosphonium. The density, surface tension and wetting angle as well as dynamic and kinematic viscosity were measured. Next, the lubricity properties were evaluated using the four-ball tester. The research results showed the more better lubricity properties of ionic liquids than the base oils. The research results showed the more better lubricity properties of ionic liquids than the base oils. The ionic liquids had the comparable properties to a high quality gear oil. Obtained results of these preliminary studies confirmed a possibility of using selected ionic liquids as new lubricants. These compounds can probably replace the lubricants used so far and find a wide scope of application in lubrication technology in the future. However, particular implementations require further complex studies.
Źródło:
Journal of KONES; 2011, 18, 1; 213-226
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępne badania właściwości smarnościowych i powierzchniowych wybranych cieczy jonowych
Investigations on lubricity and surface properties of selected ionic liquids
Autorzy:
Kałdoński, T. J.
Stańczyk, M.
Gryglewicz, Ł.
Kałdoński, T.
Powiązania:
https://bibliotekanauki.pl/articles/210921.pdf
Data publikacji:
2012
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
tribologia
ciecze jonowe
smarowanie
tribology
ionic liquids
lubrication
Opis:
W pracy omówiono wyniki badań właściwości powierzchniowych i smarnościowych pięciu cieczy jonowych w porównaniu do wysokiej jakości oleju przekładniowego Mobilube 1SHC 75W90 oraz dwóch olejów bazowych PAOAO-6 i SN-650.
In the paper, the investigation results of lubricity and surface properties for five ionic liquids, compared with the high quality gear oil Mobilube 1SHC 75W-90 and two base oils PAOAO-6 and SN-650, are discussed.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2012, 61, 1; 279-297
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of Soil Phosphatases to Three Different Ionic Liquids With Hexafluorophosphate Anion
Autorzy:
Telesiński, A.
Śnioszek, M.
Biczak, R.
Pawłowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/123035.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ionic liquids
soil
phosphomonoesterases
phosphotriesterase
inorganic pyrophosphatase
resistance index
Opis:
The aim of this study was to determine the effect of three different ionic liquids (ILs): 1-butyl-1-methylpyrrolidynium hexafluorophosphate [Pyrrol][PF6], 1-butyl-1-methylpiperydynium hexafluorophosphate [Piper][PF6] and 1-butyl-4-methylopirydynium hexafluorophosphate [Piryd][PF6] on phosphatase activities in soil. The pot experiment was carried out on loamy sand (Corg content 9.0 g/kg) with spring barley as a tested plant. The ILs was used at the dosages of 0, 1, 10, 50, 100, 400, 700 and 1000 mg/kg dry matter (DM). On day 14, soil samples were collected and activities of alkaline phosphomonoesterase, acid phosphomonoesterase, phosphotriesterase and inorganic pyrophosphatase were determined. Based on the analysis of the effect measure η2 by variance analysis – ANOVA – the percentage shares of all variable factors affecting the activity of phosphatases were also defined. Obtained results showed that the application of different dosages of all ILs caused mainly non-significant changes in phosphatase activity. Changes in activity of phosphatases were often not dependent on IL dosages. The most sensitive for ILs were both phosphomonoesterases. The type of ILs had the highest percentage participation in formation of acid phosphomonoesterase activity, while dosages of ILs affected mainly alkaline phosphomonoesterase and phosphotriesterase activities.
Źródło:
Journal of Ecological Engineering; 2017, 18, 2; 86-91
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the concentration of the ionic liquid didecyldimethylammonium lactate on the retention and separation of pyrimidine bases
Autorzy:
Szymański, M.
Zapart, J.
Florek, G.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/347003.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
ionic liquids
reversed-phase high-performance liquid chromatography
additives
Opis:
Ionic liquids (IL) are new materials with a wide spectrum of use. Being a variable combination of an organic cation and an organic or inorganic anion, their have controllable properties. The effect of the ionic liquid added to the mobile phase on the separation of uracil derivatives is studied and demonstrated in this paper. The ionic liquid used was didecyldimethylammonium lactate, which has an advantageous effect on the separation of the analytes studied. Pyrimidine bases which were used as the test compounds are characterized by alkaline properties due to which so-called peak tailing is observed during separation. A methanol/water mixture was used as the mobile phase in the chromatographic analyses. Optimum separations were obtained for 8% levels of the organic modifier. The best separations of the test isomers were obtained for 0.01% IL added to the mobile phase. The findings obtained are evidence that the use of ionic liquids in HPLC is an efficient method for the separation of polar compounds: the duration of the analysis is shorter and the resulting peaks are sharp and symmetrical.
Źródło:
Ars Separatoria Acta; 2012-2013, 9/10; 15-24
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The energetic - superficial and lubricity properties of petroleum products and ionic liquids
Autorzy:
Kałdoński, T. J.
Kałdoński, T.
Pakowski, C.
Powiązania:
https://bibliotekanauki.pl/articles/244139.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
boundary layer
lubricity
ionic liquids
surface tension
contact angle
Opis:
This paper presents the results of comparative investigations on the lubricity and energetic superficial properties of selected petroleum products and new ionic liquids (ILs). Three base oils from polish petroleum refinery (PAO—6, SN-650, SN—350) and lubricity additive (Additin RC2515 EP) have been investigated comparatively to four ionic liquids with imidazolium organic cations and different inorganic anions, i. e. bis (trifluoromethylsulfonyl) imide and tetrafluoroborate. The lubricating ability properties petroleum products and ionic liquids have been assessed according to Polish Standard PN-76/C-04 1 47 (ASTMD2596-69 and ASTM D2270-77) on Four-Ball Testing machine. The investigation range of lubricity properties are limited to the assessment only two parameters i. e. P(t) - seizure load for increasing continuous loading and G(oz) - wear limiting load capacity. The superficial properties of oil compounds and ionic liquids have been assessed by means of modern KSV Sigma 701 Tensiometer. Surface tension o and wetting angle fi were assessed. The obtained results confirmed the possibilities of using tested ionic liquids as lubricants. The best lubricity properties, close to properties of Additin RC2515, had 1—methyl— 3—oktyloxymethylimidazolium tetrafluoroborate.
Źródło:
Journal of KONES; 2009, 16, 1; 239-244
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 90

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