Wyniki wyszukiwania - Biblioteka Nauki

1

Measurement and correlation of the solubility of crown ethers in selected organic solvents

100%

Domańska U.

Polish Journal of Chemistry

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1998

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tom Vol. 72, nr 5

925-939

EN

The solid-liquid equilibrium (SLE), of 13 binary mixtures {18-crown-6(1) + selected organics solvents: benzene, 1-heptene, 1-heptyne, tert-butanol, ethyl mathyl ketone, methyl n-propyl ketone, isobutyl methyl ketone, 1-hexanal, epichlorohydrin, DMSO, 1,1,1-trichloroethane, tetrachloroethylene, 1-chlorobutane (2)} have been determined between 240-315 K. The data have been correlated with three G(E) equations: Wilson, NRTL and UNIQUAC. Moreover published earlier nineteen sets of SLE data for different crown ether: {12-crown-4 or 18-crown-6, or dibenzo-8-crown-6, or dibenzo-24-crown-8(1) + organic solvent (2)} published earlier have been examined, using the same correlation equations. The best cerrelation of the solubility data have been obtained by Wilson's equation, where the root-mean-square deviation of the solubility temperatures varied from 0.44 K to 1,87 K and were dependent on the solute calculated. In the calculations, the existence of solid-solid forst-order phase transition in 18-crown-6 and dibenzo-24-crown-8 have been taken into consideration.

2

Recent Developments in Thermodynamics of Mixtures Containing 1,3-Dialkylimidazolium Alkylsulfate Ionic Liquids

100%

Domańska U.

Polish Journal of Chemistry

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2008

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tom Vol. 82, nr 10

1923-1939

EN

Mixtures of ionic liquids, (ILs), with organic solvents exhibit a most interesting research area in thermodynamics. This report presents the ge eral discussion on the solid-liquid equilibria (SLE), high pressure solid-liquid equilibria, binary and ternary liquid-liquid equilibria (LLE), excess molar volumes, Vm E and ac tiv ity co ef fi cients at in finite dilution, gamma 1 Infinity of 1,3-dialkylimidazolium alkylsulfate ionic liquids, in alcohols and hydrocarbons. New sol u bil ity data of 1,3-dimethylimidazolium methylsulfate, [MMIM][CH3SO4] and 1-butyl-3-methylimidazolium octylsulfate, [BMIM][OcSO4] in methanol are presented. The solubilities have been measured by a dynamic method from 220 K to the melting point of the ionic liquid. Solubility of [MMIM][CH3SO4] and [BMIM][OcSO4] in methanol is very similar because of close melting temperatures of these ILs. The data were correlated by means of the NRTL and UNIQUAC equations utilizing parameters derived from the solid-liquid equilibrium. The melting point, the glass transition temperature and the enthalpy of fusion of [BMIM][OcSO4] were determined by the differential scanning calorimetry (DSC). The solubility of 1,3-dialkylimidazolium alkylsulfate ionic liquids in alcohols and hydrocarbons decreases with an in crease of the molecular weight of the solvent. Usually, with the exception of methanol and short chain alcohols, the mutual liquid-liquid equilibrium with the upper critical solution temperature (UCST) is observed in the liquid phase. This review presents a survey of the most recent data material including current developments and aspects of research activities needed in the future.

3

Solubility of n-alkanes in ethyl tert-butyl ether

63%

Domańska U. , Venkatesu P.

Polish Journal of Chemistry

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1998

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tom Vol. 72, nr 8

1981-1993

EN

The solid-liquid equilibrium (SLE), of 11 binary mixtures of n-alkanes (octadecane, nonadecane, eicosane, heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane) in ethyl tert-butyl ether, (ethyl 1,1-dimethylethyl ether, ETBE) have been determined from 275 K to the melting temperature of n-alkane. Results of solubility are compared with values calculated by Wilson, NRTL and UNIQUAC equations utilizing parameters from SLE. The existence of solid-solid first order phase transition in hydrocarbons has been considered in the solubility calculations. The best correlation of the solubility data has been obtained by the NRTL equation, where the average root-mean-square deviation of the solubility temperaures is 0.84 K.

4

Conductivity of 1-Butyl-3-methyl-imidazolium Chloride Solutions in Alcohols

63%

Domańska U. , Bogel-Łukasik E.

Polish Journal of Chemistry

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2006

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tom Vol. 80, nr 1

189-203

EN

This work presents the ionic conductivity of 1-butyl-3-methylimidazolium chloride [bmim][Cl]'s solutions in alcohols (ethanol, 1-butanol, 1-hexanol, 1-octanol, 1-decanol, 2-butanol, 2-methyl-2-propanol) and that of pure alcohols measured in wide range of temperature and concentration. The values of limiting conductance were determined by the Onsager limiting law. The molar conductivities of these systems were presented as a function of temperature and concentration. The mathematical description of ionic conductivities data by the Vogel-Tammen-Fulcher equation was made. It was shown that the conductivity of [bmim][Cl]'s solutions in the relatively low dielectric constant media is affected by the length of an alcohol carbon chain.

5

Formulation of nimesulide-loaded polylactide/poly(lactic-co-glycolic acid) nanoparticles and the evaluation of release kinetics

51%

Pobudkowska A. , Nosol K. , Gierycz P. , Domańska U.

Polimery

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2018

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tom T. 63, nr 9

586--593

EN

Polymeric nanoparticles containing nimesulide (NIM) were prepared by the emulsion solvent evaporation method. Biodegradable polymers were used as materials for nanoparticle formulations with the application of studies for the drug delivery sector in mind. Two analytical methods, scanning electron microscopy (SEM) and particle size analysis, were applied to investigate the obtained nanoparticles. Characteristic parameters were calculated to describe the amount of active pharmaceutical ingredient trapped in nanoparticles. The biological active substance release process was investigated under different conditions. The impact of various parameters [kind of polymer (PLA or PLGA), speed of mixing and especially of pH] is presented across our research.

PL

Polimerowe nanocząstki zawierające nimesulid (NIM) otrzymano metodą emulsyjną z odparowaniem rozpuszczalnika. Do ich wytworzenia wykorzystano biodegradowalne polimery. Wytworzone nanocząstki zbadano za pomocą skaningowej mikroskopii elektronowej (SEM) oraz analizatora wielkości cząstek. Obliczono charakterystyczne parametry opisujące ilość substancji farmaceutycznie aktywnej uwięzionej wewnątrz nanocząstek. Oceniono wpływ rodzaju polimeru stosowanego do kapsułkowania, szybkości mieszania suspensji, w szczególności pH środowiska na proces uwalniania substancji biologicznie czynnej.

6

Electrodeposition of aluminium on low carbon steel from [C1C2Im]Cl:AlCl3 mixtures doped with [C1C2Im][NTf2] or [C1C2Pyr][NTf2]

45%

Zawadzki M. , Treichel A. , Królikowski M. , Domańska U. , Kwiatkowski L.

Inżynieria Powierzchni

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2017

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tom nr 3

46--52

EN

This study reports electrodeposition of aluminium (Al) from 1-ethyl-3-methylimidazolium chloride/aluminium chloride melt ([C1C2Im]Cl:AlCl3 / 1:2) with an addition of two different bis{(trifluoromethane)sulfonyl}imide anion-based ionic liquids [C1C2Im][NTf2] and [C1C2Pyr][NTf2]. Potentiostatic electrodeposition was performed to obtain Al coatings on low carbon steel and the effect of addition of particular ionic liquid was studied. Coatings were investigated with SEM-EDX measurements and potentiodynamic measurements characterising their corrosion behaviour. The coatings of good adhesion (appearance), uniformity and corrosion resistance were obtained for the steel sample coated in the melt with an addition of 3% wt of [C1C2Im][NTf2].

PL

Przedstawiano wyniki badań nad elektrolitycznym osadzaniem aluminium (Al) z mieszaniny chlorku 1-etylo-3-metyloimida-zoliowego z chlorkiem gliniu ([C1C2Im]Cl : AlCl3/1 :2) wraz z dodatkami cieczy jonowych z anionem bis{(trifluorometylo) sulfonylo}imidkowym i kationami N-etylo-N-metylopirolidyniowym i 1-etylo-3-metyloimidazoliowym. Proces eletroosadzania powłok na niskowęglowej stali przeprowadzono metodą potencjostatyczną. Analizowao wpływu dodatków cieczy jonowych na właściwości otrzymanych powłok. Powłoki badano za pomocą mikroskopii elektronowej (SEM-EDX), oraz pomiarów potencjodynamicznych charakteryzujących ich zachowanie korozyjne. Powłoki charakteryzujące się dobrą przyczepnością, wyglądem, jednorodnością i odpornością na korozję otrzymano z mieszaniny ([C1C2Im]Cl : AlCl3/1 :2) z dodatkiem 3% wagowo [C1C2Im][NTf2]. Ponadto wykazano brak rozpuszczalności chlorku glinu w niektórych cieczach jonowych w temperaturze T = 353 K.