64697-40-1Relevant academic research and scientific papers
Effect of alkyl groups in organic part of polyoxo-metalates based ionic liquids on properties of flame retardant polypropylene
Chen, Shengjiao,Wang, Chengle,Li, Juan
, p. 51 - 58 (2016)
The structure-property relationship of a series of polyoxo-metalates based ionic liquids (PILs) modified polypropylene (PP)/Intumescent flame retardant (IFR) composites were studied. The results showed that the chemical structure of PILs has a great effect on properties of PP composites. The flame retardancy of PP/IFR/PILs composites with a shorter alkyl group are better than that with a longer alkyl group. The PP/IFR/PIL composite with 0.5 wt% PIL with 1-butyl-3-methyl imidazole and 14.5% IFR gets the UL-94 V-0, but achieving the same UL-94 grade needs no less than 19.5 wt% IFR and 0.5 wt% PIL with 1-octyl-3-methyl imidazole. In addition, PILs modified by different groups have great effects on the mechanical properties, the PP/IFR/PIL composites containing 1-dodecyl-3-methyl imidazole obtain the best notch impact strength. The results show that the flame retardant and mechanical properties of PP/IFR/PILs composites can be tailored by changing the cation structure of PIL.
Investigation of the role of ionic liquids in tuning the pK a values of some anionic indicators
Safavi,Abdollahi,Maleki,Zeinali
, p. 753 - 761 (2009)
The effect of imidazolium-based ionic liquids, ([C12mim][Cl] and [C8mim][Cl]), on the acid-base equilibria of two sulfonated indicators has been studied. The presence of ILs leads to decreased pK a values because of the st
Deep desulfurization of light oil through extraction and oxidation processes using H2O2/tungstophosphoric acid in room-temperature ionic liquids
Chuang, Li-Lin,Huang, Jung-Fu,Lo, Wen-Hen,Wei, Guor-Tzo
, p. 324 - 330 (2012)
In this research, using room-temperature ionic liquids (RTILs) as the solvents to combine solvent extraction and chemical oxidation processes in one-pot operation for the desulfurization of fuel oil was pursued. In this solvent extraction and chemical oxidation desulfurization (SECOD), RTILs as media are immiscible with oil; sulfur compounds in oil are extracted into RTILs and oxidized thereafter to the corresponding sulfones by H2O 2/TPA (tungstophosphoric acid). During SECOD, these high polar sulfones partition mainly in the ionic liquid phase. Hence, it results in their continuous removal from oil, which leads to deep desulfurization. To study the SECOD, we employed dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) in hexadecane asmodel oil systems and compared the effects of RTILs on the removal of DBT and 4,6-DMDBT. The desulfurization rates followed the order OMIM+PF6 - > BMIM+PF6 - > BMIM+BF4 -. Both OMIM+PF6 - and BMIM+PF6 - are water-immiscible and form three-phase (oil-water- ionic liquid) reaction systems; these three-phase systems offer higher removal efficiencies of sulfur compounds from oil. Under the optimized conditions, SECOD process reduced the sulfur content of diesel light oil from 897 to 42 ppm (i.e., 95% desulfurization efficiency) in a one-batch operation.
Modulating the Aggregation Behavior of 1-Methyl-3-Octylimidazolium Chloride by Alcohols in Aqueous Media
Pal, Amalendu,Yadav, Alka
, p. 1053 - 1062 (2016)
The self-organization and aggregation behavior of a surface active ionic liquid (SAIL) 1-methyl-3-octylimidazolium chloride [C8mim]Cl, was investigated in aqueous solutions of alcohols 1,2-propanediol and 1-propanol in different compositions using conductivity, surface tension and fluorescence measurements at room temperature. This surface active ionic liquid was synthesized by the reaction of 1-methylimidazole with 1-chlorooctane. Fluorescence spectroscopy was employed to get detailed insight into the local microenvironment of the aggregates, critical aggregation concentrations (CAC) and aggregation number (Nagg.). Degree of ionization (α), CAC and various thermodynamic parameters like the standard Gibbs free energy of aggregation (ΔGagg. 0), standard enthalpy of aggregation (ΔHagg. 0) and standard entropy of aggregation (ΔSagg. 0) were calculated using conductivity measurements at different temperatures (288.15, 298.15 and 308.15?K). The surface activity of the IL in various mixed solvents was evaluated from surface tension measurements by calculating various surface parameters like the minimum surface area occupied by a single ionic liquid molecule (Amin), adsorption efficiency (pC20), maximum excess concentration at the surface (Γmax), effectiveness of surface tension reduction(ΠCAC), surface tension at CAC (γCAC), p (packing parameter) and CAC at different compositions. Increases in the CAC values were observed with the increase in the amount of alcohols which is attributed to the balancing between electrostatic and hydrophobic interactions. The results from different techniques show that the CAC increases with increase in the amount of the alcohol which is due to the solubilization of the IL molecules which delays the aggregation process. This shows that the spontaneity of the aggregation process of IL decreases with the increase in the concentration of alcohols in water.
Ionic liquids/water distribution ratios of some polycyclic aromatic hydrocarbons
Liu, Jing-Fu,Chi, Yu-Guang,Peng, Jin-Feng,Jiang, Gui-Bin,Joensson, Jan Ake
, p. 1422 - 1424 (2004)
By using the shake-flask procedure, the distribution ratios (D) at infinite dilution and 298.1 K of 15 polycyclic aromatic hydrocarbons (PAHs) between room-temperature ionic liquids, l-alkyl-3-methylimiazolium hexafluorophosphates ([CnMIM] [PF
Buffered chlorogallate(iii) ionic liquids and electrodeposition of gallium films
Seddon, Kenneth R.,Srinivasan, Geetha,Swad?ba-Kwa?ny, Ma?gorzata,Wilson, Anthony R.
, p. 4518 - 4526 (2013)
Buffering of Lewis acidic chlorometallate ionic liquids is a useful tool to modify their properties for electrochemical and catalytic applications. Lewis acidic chlorogallate(iii) ionic liquids containing the 1-octyl-3- methylimidazolium cation, buffered with sodium chloride, were studied using 71Ga NMR spectroscopy and cyclic voltammetry. All the studied Lewis acidic compositions (0.50 GaCl3 ≤ 0.75) could be buffered to mild or moderate acidity, but not to neutrality. Electrodeposition of gallium from such buffered systems was possible, yielding deposits of improved morphology over the unbuffered ionic liquids, due to the constant melt composition maintained by the buffer. These findings were in a stark contrast with older studies on chloroaluminate(iii) ionic liquids buffered with sodium chloride.
The Influence of Water and Metal Salt on the Transport and Structural Properties of 1-Octyl-3-methylimidazolium Chloride
Goujon, Nicolas,Byrne, Nolene,Walsh, Tiffany R.,Forsyth, Maria
, p. 420 - 425 (2015)
The addition of diluents to ionic liquids (ILs) has recently been shown to enhance the transport properties of ILs. In the context of electrolyte design, this enhancement allows the realisation of IL-based electrolytes for metal-air batteries and other storage devices. It is likely that diluent addition not only impacts the viscosity of the IL, but also the ion-ion interactions and structure. Here, we investigate the nano-structured 1-methyl-3-octylimidazolium chloride (OMImCl) with varying water concentrations in the presence of two metal salts, zinc chloride and magnesium chloride. We find that the choice of metal salt has a significant impact on the structure and transport properties of the system; this is explained by the water structuring and destructing properties of the metal salt.
Opportunities for ionic liquids in recovery of biofuels
Fadeev,Meagher
, p. 295 - 296 (2001)
Room temperature ionic liquids have potential as extractants in recovery of butyl alcohol from fermentation broth; water solubility in ionic liquid and ionic liquid solubility in water are important factors affecting selectivity of butyl alcohol extractio
Ultrafast igniting, imidazolium based hypergolic ionic liquids with enhanced hydrophobicity
Bhosale, Vikas K.,Kulkarni, Prashant S.
, p. 1250 - 1258 (2017)
Exploring ultrafast igniting and hydrolytically stable ionic liquids (ILs) has a wide scope in hypergolic rocket fuels. The hydrophobicities of ILs, induced by a smart change in alkyl substituents of imidazolium cations with energy-rich cyanoborohydride, [BH3CN]- and dicyanamide, [DCA]- anions were examined for the first time. The physico-chemical properties and performance of ILs were also studied. Consequently, hydrolytic stability in terms of moisture study of all the ILs was thoroughly investigated under standard environmental conditions. The analysis indicates that the IL 14, 1-allyl-3-octyl imidazolium cyanoborohydride is most hydrophobic and hydrolytically stable. Studies evaluating the role of the cationic hydrocarbon chain and the nature of anions of ILs on the properties of hypergolic fuel were carried out. All the ILs are liquid at room temperature and exhibit a positive heat of formation. IL 10, 1,3-diallyl-imidazolium cyanoborohydride exhibited the shortest ignition delay of 1.9 ms with WFNA and IL 11, 1-allyl-3-ethyl imidazolium cyanoborohydride presented the lowest viscosity of 16.62 mPa s. Therefore, these ILs can be suggested as potential candidates for replacing acutely toxic and carcinogenic hydrazine and its methylated derivatives as hypergolic fuels.
Impact of imidazolium-based ionic liquids on the structure and stability of lysozyme
Satish, Lakkoji,Rana, Shubhasmin,Arakha, Manoranjan,Rout, Lipeeka,Ekka, Basanti,Jha, Suman,Dash, Priyabrat,Sahoo, Harekrushna
, p. 383 - 390 (2016)
Various types of water-miscible aprotic ionic liquids (ILs) with different cations (1-ethyl-3-methylimidazolium, 1-butyl-3-methylimidazolium, 1-octyl-3-methylimidazolium) and anions (ethylsulfate and chloride) were used as co-solvents to investigate the s
