Inorganic/organic double-network ion gel membrane with a high ionic liquid content for CO2 separation

Development of a Micro-Double-Network Ion Gel-Based CO2 Separation Membrane from Nonvolatile Network Precursors

“…To compare the CO 2 permeabilities between ion gel membranes fabricated using nonvolatile and volatile inorganic/organic network precursors, the DN ion gel membrane was prepared using DMAAm and TEOS as the volatile network precursors. The DN ion gel membranes were prepared according to the one-pot/two-step method described in our previous work. , Herein, the TEOS/DMAAm ratio and the IL content of the DN ion gel were fixed at 0.35 mol/mol and 80 wt %, respectively. More detailed preparation conditions are provided in the Supporting Information.…”

“…We also developed tough ion gels formed by special interpenetrating organic/organic or inorganic/organic networks, designated as double-network (DN) ion gels. − In particular, because the inorganic/organic DN ion gels can be prepared via a one-step process, the IL content can be easily increased and controlled. We fabricated a DN ion gel with more than 95 wt % IL and demonstrated the excellent CO 2 permeability of the DN ion gel membrane .…”

“…We also developed tough ion gels formed by special interpenetrating organic/organic or inorganic/organic networks, designated as double-network (DN) ion gels. − In particular, because the inorganic/organic DN ion gels can be prepared via a one-step process, the IL content can be easily increased and controlled. We fabricated a DN ion gel with more than 95 wt % IL and demonstrated the excellent CO 2 permeability of the DN ion gel membrane . Furthermore, we fabricated new DN ion gels, designated as micro-double-network (μ-DN) ion gels, which can be prepared from nonvolatile network precursors using silica nanoparticles and a presynthesized cross-linkable polymer as the inorganic network precursor and the organic network precursor, respectively .…”

Effects of the Si–O–Si Network Structure on the Permeation Properties of Silylated Ionic Liquid-Derived Membranes

“…Ionic liquids (ILs) are a class of molten salts with melting points below 100°C that consist of organic cations and organic/inorganic anions, and exhibit advantageous physical and chemical properties, such as negligible vapor pres-sure, thermal stability, and the ability to dissolve a large range of organic molecules (Camper et al, 2005;Domańska et al, 2006;Conceiçao et al, 2012). Several methods, such as impregnation (Barghi et al, 2010;Matsumoto et al, 2011;Zhao et al, 2012), polymerization (Bara et al, 2007;Li et al, 2012;Cowan et al, 2016), and gelation (Fujii et al, 2015;Moghadam et al, 2015;Kamio et al, 2021), have been investigated to prepare IL membranes. us far, IL membranes have been applied for separating CO 2 (Bara et al, 2007;Barghi et al, 2010;Fujii et al, 2015;Kamio et al, 2021), O 2 (Matsuoka et al, 2017(Matsuoka et al, , 2020, alkenes (Won et al, 2005;Fallanza et al, 2012;Sanchez et al, 2020), aromatic hydrocarbons (Matsumoto et al, 2005;Chakraborty and Bart, 2007;Sheridan and Evans, 2019), and stereoisomers (Kamaz et al, 2019).…”

“…Several methods, such as impregnation (Barghi et al, 2010;Matsumoto et al, 2011;Zhao et al, 2012), polymerization (Bara et al, 2007;Li et al, 2012;Cowan et al, 2016), and gelation (Fujii et al, 2015;Moghadam et al, 2015;Kamio et al, 2021), have been investigated to prepare IL membranes. us far, IL membranes have been applied for separating CO 2 (Bara et al, 2007;Barghi et al, 2010;Fujii et al, 2015;Kamio et al, 2021), O 2 (Matsuoka et al, 2017(Matsuoka et al, , 2020, alkenes (Won et al, 2005;Fallanza et al, 2012;Sanchez et al, 2020), aromatic hydrocarbons (Matsumoto et al, 2005;Chakraborty and Bart, 2007;Sheridan and Evans, 2019), and stereoisomers (Kamaz et al, 2019). Although the permselectivities of IL membranes are a ected by various factors such as ionic species, viscosity, membrane thickness, and separation temperature, the transport mechanisms of molecules through IL membranes can be explained by the solution-di usion model: e permeation and separation performances of IL membranes are in uenced by the membrane's a nity to feed molecules and the ease of molecular di usion through the membrane.…”