Synthesis and physical properties of new layered silicates based on ionic liquids: improvement of thermal stability, mechanical behaviour and water permeability of PBAT nanocomposites

RSC Advances ◽  
2014 ◽  
Vol 4 (50) ◽  
pp. 26452-26461 ◽  
Author(s):  
Sébastien Livi ◽  
Gabriela Sar ◽  
Valeria Bugatti ◽  
Eliane Espuche ◽  
Jannick Duchet-Rumeau
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Physical Properties ◽  
Mechanical Behaviour ◽  
Water Permeability ◽  
Layered Silicates ◽  
Alkyl Chains ◽  
Imidazolium Cations ◽  
Cationic Exchange

Ionic liquids based on tetraalkylphosphonium and dialkyl imidazolium cations with long alkyl chains have been investigated as new surfactant agents for cationic exchange of lamellar silicates.

Effect of the number, position and length of alkyl chains on the physical properties of polysubstituted pyridinium ionic liquids

2014 ◽  
Vol 69 ◽  
pp. 19-26 ◽  
Author(s):  
Pedro Verdía ◽  
Marta Hernaiz ◽  
Emilio J. González ◽  
Eugénia A. Macedo ◽  
Josefa Salgado ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physical Properties ◽  
Alkyl Chains

scholarly journals Thermal stability of imidazolium-based ionic liquids

2016 ◽  
Vol 4 (1) ◽  
pp. 51-64 ◽  
Author(s):  
Léa Chancelier ◽  
Olivier Boyron ◽  
Thibaut Gutel ◽  
Catherine Santini
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Van Der Waals Interactions ◽  
Alkyl Chains ◽  
Coulombic Interactions ◽  
The Impact ◽  
Thermal Stability Of

This work highlights the factors tuning the thermal stability of imidazolium-based ionic liquids (IL) associated to bis(trifluoromethanesulfonyl)imide anion [NTf2]. The decomposition temperatures (Td) were evaluated by thermogravimetric analyses (TGA) with optimized parameters to obtain reproducible Td. The impact of the alkyl chain length and of the presence of functional groups and unsaturations on Td were evaluated. The thermal behaviour was governed by Van der Waals interactions between alkyl chains, and by inter and intra coulombic interactions such as hydrogen bonds.

scholarly journals Functions of Ionic Liquids in Preparing Membranes for Liquid Separations: A Review

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 395
Author(s):  
Dayuan Zheng ◽  
Dan Hua ◽  
Yiping Hong ◽  
Abdul-Rauf Ibrahim ◽  
Ayan Yao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Vapor Pressure ◽  
Physical Properties ◽  
Review Article ◽  
Future Perspectives ◽  
Comprehensive Overview ◽  
Membrane Materials ◽  
Recent Developments ◽  
Liquid Separations

Membranes are widely used for liquid separations such as removing solute components from solvents or liquid/liquid separations. Due to negligible vapor pressure, adjustable physical properties, and thermal stability, the application of ionic liquids (ILs) has been extended to fabricating a myriad of membranes for liquid separations. A comprehensive overview of the recent developments in ILs in fabricating membranes for liquid separations is highlighted in this review article. Four major functions of ILs are discussed in detail, including their usage as (i) raw membrane materials, (ii) physical additives, (iii) chemical modifiers, and (iv) solvents. Meanwhile, the applications of IL assisted membranes are discussed, highlighting the issues, challenges, and future perspectives of these IL assisted membranes in liquid separations.

Tribological Performance of Ionic Liquids Bearing Hydroxyl Groups as Lubricants in the Aluminum-on-Steel Contacts

2010 ◽  
Vol 146-147 ◽  
pp. 1147-1153 ◽  
Author(s):  
Xi Feng Li ◽  
Zong Gang Mu ◽  
Xiao Xuan Wang ◽  
Shu Xiang Zhang ◽  
Yong Min Liang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Friction And Wear ◽  
Tribological Performance ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Test Results ◽  
Alkyl Chains ◽  
Imidazolium Cations ◽  
Boundary Films ◽  
Aluminum Surfaces

A series of room temperature ionic liquids bearing hydroxyl groups, namely 1-(3’-hydroxyl-n-propyl)-3-alkylimidazolium tetrafluoroborate or hexafluorophosphate, were prepared and characterized. Their typical physical properties were also determined. The tribological test results show that these ionic liquids possess better friction-reducing and anti-wear ability for aluminum-on-steel system than lubricant X-1P. The friction coefficients of them are little higher than that of the nonfunctionlized ionic liquid LP308, while they possess better anti-wear abilities than the latter, which may ascribe to the chemical activity of hydroxyl group. Both the anions and the side substituted alkyl chains attached to the imidazolium cations affect the tribological performance of the lubricants. The SEM, EDS and XPS analysis of the worn surfaces show that complicated tribo-chemical reactions were involved in the sliding process. The boundary films composed of fluorides, nitrogen oxide, BN, and FePO4 were generated on the rubbing aluminum surfaces, which contribute to effectively decreasing the friction and wear of the contacts.

Novel phosphorus-containing halogen-free ionic liquids: effect of sulfonate anion size on physical properties, biocompatibility, and flame retardancy

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52485-52494 ◽  
Author(s):  
Qiu-Xia He ◽  
Liang Tang ◽  
Teng Fu ◽  
Yue-Quan Shi ◽  
Xiu-Li Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Physical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Melting Points ◽  
Phosphorus Containing ◽  
Halogen Free ◽  
Sulfonate Anion

Phosphorus-containing sulfonate ILs with different anions size present different thermal stability, solubility, viscosity, melting points, and cytotoxicity. They show flame retardant effect for PA6 via accelerating decomposition of matrix.

scholarly journals Selective separation of trivalent f-ions using 1,10-phenanthroline-2,9-dicarboxamide ligands in ionic liquids

2016 ◽  
Vol 45 (29) ◽  
pp. 11624-11627 ◽  
Author(s):  
Jérémy Dehaudt ◽  
Neil J. Williams ◽  
Ilya A. Shkrob ◽  
Huimin Luo ◽  
Sheng Dai
Keyword(s):  
Ionic Liquids ◽  
Selective Separation ◽  
Imidazolium Ionic Liquids ◽  
Alkyl Chains ◽  
Imidazolium Cations

1,10-Phenanthroline-2,9-dicarboxamide complexants decorated with alkyl chains and imidazolium cations have been studied for extraction of trivalent f-ions into imidazolium ionic liquids.

NIPPON/SUMITOMO SUPER625

Alloy Digest ◽  
2017 ◽  
Vol 66 (12) ◽  
Keyword(s):  
Thermal Stability ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
Hot Workability ◽  
Temperature Performance ◽  
Compositional Elements

Abstract Nippon Sumitomo Super625 is a nickel alloy with an optimization of compositional elements for thermal stability and hot workability. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming. Filing Code: Ni-740. Producer or source: Sumitomo Metal USA Corporation.

scholarly journals Extraordinary thermal behavior of graphene oxide in air for electrode applications

2021 ◽  
Author(s):  
Joong Tark Han ◽  
Joon Young Cho ◽  
Jeong Hoon Kim
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Physical Properties ◽  
Thermal Behavior ◽  
Stability Of Solution ◽  
Exfoliated Graphene ◽  
Potential Applications ◽  
Thermal Stability Of

The thermal stability of solution-exfoliated graphene oxide (GO) in air is one of the most important physical properties influencing its potential applications. To date, majority of the GO prepared by...

scholarly journals Synthesis, antibiotic structure–activity relationships, and cellulose dissolution studies of new room-temperature ionic liquids derived from lignin

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Shihong Liu ◽  
Michael Gonzalez ◽  
Celine Kong ◽  
Scott Weir ◽  
Aaron M. Socha
Keyword(s):  
Antibacterial Activity ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Oxidation Products ◽  
Cellulose Dissolution ◽  
Melting Points ◽  
E Coli ◽  
Alkyl Chains ◽  
Renewable Feedstocks ◽  
Commodity Chemicals

Abstract Background Ionic liquids (ILs) are promising pretreatment solvents for lignocellulosic biomass, but are largely prepared from petroleum precursors. Benzaldehydes from depolymerized lignin, such as vanillin, syringaldehyde, and 4-methoxy benzaldehyde, represent renewable feedstocks for the synthesis of ionic liquids. We herein report syntheses of novel lignin-derived ionic liquids, with extended N-alkyl chains, and examine their melting points, cellulose dissolution capacities, and toxicity profiles against Daphnia magna and E. coli strain 1A1. The latter organism has been engineered to produce isoprenol, a drop-in biofuel and precursor for commodity chemicals. Results The new N,N-diethyl and N,N-dipropyl methyl benzylammonium ILs were liquids at room temperature, showing 75–100 °C decreased melting points as compared to their N,N,N-trimethyl benzylammonium analog. Extension of N-alkyl chains also increased antibacterial activity threefold, while ionic liquids prepared from vanillin showed 2- to 4-fold lower toxicity as compared to those prepared from syringaldehyde and 4-methoxybenzaldehyde. The trend of antibacterial activity for anions of lignin-derived ILs was found to be methanesulfonate < acetate < hydroxide. Microcrystalline cellulose dissolution, from 2 to 4 wt% after 20 min at 100 °C, was observed in all new ILs using light microscopy and IR spectroscopy. Conclusions Ionic liquids prepared from H-, S- and G-lignin oxidation products provided differential cytotoxic activity against E. coli and D. magna, suggesting these compounds could be tailored for application specificity within a biorefinery.

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