Prospects for the Application of Scanning Electrochemical Microscopy in Ionic Liquids

2007 ◽  
Vol 60 (1) ◽  
pp. 29 ◽  
Author(s):  
Maurizio Carano ◽  
Alan M. Bond
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Steady State ◽  
Aqueous Media ◽  
Scanning Electrochemical Microscopy ◽  
State Theory ◽  
Glass Substrates ◽  
State Behaviour ◽  
Ag Substrate ◽  
Electrochemical Microscopy

Prospects have been assessed for the application of the technique of scanning electrochemical microscopy (SECM) in viscous ionic liquids. Use of the Fc0/+ redox couple (Fc = ferrocene) to obtain microelectrode approach curves revealed that the required steady state behaviour needed for analysis of data relevant to conducting platinum and insulating glass substrates is moderately easy to achieve in a 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) ionic liquid. However, in the more highly viscous 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, where significantly lower diffusion coefficients are encountered, approach-curve data that conform to steady state theory are only found with very small microelectrodes (e.g., ≤2 μm diameter), very slow electrode–substrate approach rates (e.g., ≤0.05 μm s–1), and long equilibration times (e.g., 50 s). A comparison is provided with SECM approach curves acquired in aqueous media. SECM images of an Ag substrate in contact with [BMIM][BF4] also are presented and are of only slightly inferior quality to images obtained in water.

Effect of Viscosity on Steady-State Voltammetry and Scanning Electrochemical Microscopy in Room Temperature Ionic Liquids

2010 ◽  
Vol 114 (13) ◽  
pp. 4442-4450 ◽  
Author(s):  
Kevin R. J. Lovelock ◽  
Frances N. Cowling ◽  
Alasdair W. Taylor ◽  
Peter Licence ◽  
Darren A. Walsh
Keyword(s):  
Ionic Liquids ◽  
Steady State ◽  
Room Temperature ◽  
Scanning Electrochemical Microscopy ◽  
Room Temperature Ionic Liquids ◽  
Electrochemical Microscopy

scholarly journals Biofilm Formation of a Polymer Brush Coating with Ionic Liquids Compared to a Polymer Brush Coating with a Non-Ionic Liquid

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 398 ◽  
Author(s):  
Hideyuki Kanematsu ◽  
Atsuya Oizumi ◽  
Takaya Sato ◽  
Toshio Kamijo ◽  
Saika Honma ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Polymethyl Methacrylate ◽  
Biofilm Formation ◽  
Polymer Brush ◽  
E Coli ◽  
Glass Substrates ◽  
Liquid Type ◽  
Brush Coating

N,N-diethyl-N-(2-methancryloylethy)-N-methylammonium bis(trifluoromethylsulfonyl) imide polymer (DEMM-TFSI) brush coated specimens (substrate: glasses) and a liquid ion type of polymer brush coating were investigated for their antifouling effect on biofilms. Biofilms were produced by two kinds of bacteria, E. coli and S. epidermidis. They were formed on specimens immersed into wells (of 12-well plates) that were filled with culture liquids and bacteria. The biofilm formation was observed. Also, brush coated specimens and glass substrates were investigated in the same way. DEMM polymer brush coated specimens formed more biofilm than PMMA (polymethyl methacrylate) polymer brush coated specimens and glass substrates. A greater amount of polarized components of biofilms was also observed for DEMM polymer brush coated specimens. The polar characteristics could be attributed to the attraction capability of bacteria and biofilms on DEMM polymer brush coated specimens. When considering the ease of removing biofilms by washing it with water, the ionic liquid type polymer brush (coated specimens) could be used for antifouling applications. If an initial antifouling application is needed, then the polar characteristics could be adjusted (design of the components and concentrations of ionic liquids, etc.) to solve the problem.

scholarly journals Ionic Liquids and Water: Hydrophobicity vs. Hydrophilicity

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7159
Author(s):  
Rita F. Rodrigues ◽  
Adilson A. Freitas ◽  
José N. Canongia Lopes ◽  
Karina Shimizu
Keyword(s):  
Ionic Liquid ◽  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Aqueous Media ◽  
Liquid Solution ◽  
Chemical Processes ◽  
Processes And Reactions ◽  
High Hydrogen ◽  
Ionic Liquid Solution ◽  
Dynamics Simulations

Many chemical processes rely extensively on organic solvents posing safety and environmental concerns. For a successful transfer of some of those chemical processes and reactions to aqueous media, agents acting as solubilizers, or phase-modifiers, are of central importance. In the present work, the structure of aqueous solutions of several ionic liquid systems capable of forming multiple solubilizing environments were modeled by molecular dynamics simulations. The effect of small aliphatic chains on solutions of hydrophobic 1-alkyl-3-methylimidazolium bis(trifluoromethyl)sulfonylimide ionic liquids (with alkyl = propyl [C3C1im][NTf2], butyl [C4C1im][NTf2] and isobutyl [iC4C1im][NTf2]) are covered first. Next, we focus on the interactions of sulphonate- and carboxylate-based anions with different hydrogenated and perfluorinated alkyl side chains in solutions of [C2C1im][CnF2n+1SO3], [C2C1im][CnH2n+1SO3], [C2C1im][CF3CO2] and [C2C1im][CH3CO2] (n = 1, 4, 8). The last system considered is an ionic liquid completely miscible with water that combines the cation N-methyl-N,N,N-tris(2-hydroxyethyl)ammonium [N1 2OH 2OH 2OH]+, with high hydrogen-bonding capability, and the hydrophobic anion [NTf2]–. The interplay between short- and long-range interactions, clustering of alkyl and perfluoroalkyl tails, and hydrogen bonding enables a wealth of possibilities in tailoring an ionic liquid solution according to the needs.

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