Molecular Transport Behavior of CO2 in Ionic Polyimides and Ionic Liquid Composite Membrane Materials

2019 ◽  
Vol 123 (34) ◽  
pp. 7455-7463 ◽  
Author(s):  
Joanna Szala-Bilnik ◽  
Asghar Abedini ◽  
Ellis Crabtree ◽  
Jason E. Bara ◽  
C. Heath Turner
Keyword(s):  
Ionic Liquid ◽  
Composite Membrane ◽  
Molecular Transport ◽  
Membrane Materials ◽  
Transport Behavior

scholarly journals Tuning Water Networks via Ionic Liquid/Water Mixtures

2020 ◽  
Vol 21 (2) ◽  
pp. 403 ◽  
Author(s):  
Archana Verma ◽  
John P. Stoppelman ◽  
Jesse G. McDaniel
Keyword(s):  
Ionic Liquid ◽  
Water Content ◽  
Relaxation Times ◽  
Water Structure ◽  
Lyotropic Liquid Crystals ◽  
Rotational Relaxation ◽  
Membrane Materials ◽  
Water Fraction ◽  
Pairwise Correlation ◽  
Dynamics Simulations

Water in nanoconfinement is ubiquitous in biological systems and membrane materials, with altered properties that significantly influence the surrounding system. In this work, we show how ionic liquid (IL)/water mixtures can be tuned to create water environments that resemble nanoconfined systems. We utilize molecular dynamics simulations employing ab initio force fields to extensively characterize the water structure within five different IL/water mixtures: [BMIM + ][BF 4 − ], [BMIM + ][PF 6 − ], [BMIM + ][OTf − ], [BMIM + ][NO 3 − ] and [BMIM + ][TFSI − ] ILs at varying water fraction. We characterize water clustering, hydrogen bonding, water orientation, pairwise correlation functions and percolation networks as a function of water content and IL type. The nature of the water nanostructure is significantly tuned by changing the hydrophobicity of the IL and sensitively depends on water content. In hydrophobic ILs such as [BMIM + ][PF 6 − ], significant water clustering leads to dynamic formation of water pockets that can appear similar to those formed within reverse micelles. Furthermore, rotational relaxation times of water molecules in supersaturated hydrophobic IL/water mixtures indicate the close-connection with nanoconfined systems, as they are quantitatively similar to water relaxation in previously characterized lyotropic liquid crystals. We expect that this physical insight will lead to better design principles for incorporation of ILs into membrane materials to tune water nanostructure.

Preparation of a positively charged nanofiltration membrane based on hydrophilic–hydrophobic transformation of a poly(ionic liquid)

2015 ◽  
Vol 3 (23) ◽  
pp. 12367-12376 ◽  
Author(s):  
Ying Tang ◽  
Beibei Tang ◽  
Peiyi Wu
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Ion Exchange ◽  
Exchange Reaction ◽  
Composite Membrane ◽  
Nanofiltration Membrane ◽  
High Permeability ◽  
Ion Exchange Reaction ◽  
Poly Ionic Liquid ◽  
Positively Charged

A positively charged NF composite membrane with high permeability was obtained via a simple counter-ion exchange reaction in an aqueous solution, due to the hydrophilic–hydrophobic transformation of the PIL.

A polymeric ionic liquid functionalized temperature-responsive composite membrane with tunable responsive behavior

2015 ◽  
Vol 3 (15) ◽  
pp. 7919-7928 ◽  
Author(s):  
Ying Tang ◽  
Beibei Tang ◽  
Peiyi Wu
Keyword(s):  
Ionic Liquid ◽  
Composite Membrane ◽  
Polymeric Ionic Liquid ◽  
Temperature Responsive ◽  
Responsive Behavior ◽  
Supporting Membrane

A temperature-responsive composite membrane with tunable responsive behavior was obtained by chemically grafting a PIL functionalized temperature-responsive copolymer onto the BPPO supporting membrane.

Molecular transport in ionic liquid/nanomembrane hybrids

2020 ◽  
Vol 22 (17) ◽  
pp. 9808-9814
Author(s):  
Daniil Naberezhnyi ◽  
Petr Dementyev
Keyword(s):  
Ionic Liquid ◽  
Surface Functionalization ◽  
Molecular Transport ◽  
Ultrathin Membranes

Molecular transport in ultrathin membranes changes upon surface functionalization.

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