An amino acid ionic liquid-based tough ion gel membrane for CO<sub>2</sub> capture

Moghadam, Farhad; Kamio, Eiji; Yoshizumi, Ayumi; Matsuyama, Hideto

doi:10.1039/c5cc04841a

Cited by 87 publications

(68 citation statements)

References 18 publications

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“…DN ion gel showed a compression fracture stress of 30 MPa at 87% strain (Figure 1d), which is higher than that of conventional DN hydrogel (17.2 MPa). Since conventional DN gel replaced by amino acid-based IL also shows high mechanical strength (>25 MPa), [24] the combination of ILs and compatible polymers is supposed to be enough to obtain high mechanical strength without the aid of hydration observed in electrolyte polymers. [26][27][28] On the other hand, the compression fracture stress of a single-network gel of poly(DEMM-TFSI) (1 MPa) and PMMA (3 MPa) showed much lower values, which suggests that such high mechanical strength of the combination of these two materials is based on the formation of double-network structures.…”

Section: Doi: 101002/admi201700074mentioning

confidence: 99%

“…[6] While DN hydrogels have been intensively studied as tough hydrogels for biomaterial applications, [23] study on DN ion gels are only limited to a gas separation membrane, which is fabricated by substituting water in DN hydrogel to an amino acid-based ionic liquid. [24] We therefore newly synthesized DN ion gel whose polymer backbone was composed of an ionic liquid-type polymer poly(DEMM-TFSI) as a first network and poly(methyl methacrylate) (PMMA) as a second network (Figure 1a). Since both of these polymers are thermally stable and compatible with DEME-TFSI, a robust DN ion gel can be obtained with high mechanical strength and thermal stability, retaining low friction at high temperatures or under vacuum conditions.…”

Section: Doi: 101002/admi201700074mentioning

confidence: 99%

“…[26][27][28] On the other hand, the compression fracture stress of a single-network gel of poly(DEMM-TFSI) (1 MPa) and PMMA (3 MPa) showed much lower values, which suggests that such high mechanical strength of the combination of these two materials is based on the formation of double-network structures. Since conventional DN gel replaced by amino acid-based IL also shows high mechanical strength (>25 MPa), [24] the combination of ILs and compatible polymers is supposed to be enough to obtain high mechanical strength without the aid of hydration observed in electrolyte polymers.…”

Section: Doi: 101002/admi201700074mentioning

confidence: 99%

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Highly Robust and Low Frictional Double‐Network Ion Gel

Arafune

Honma

Morinaga

et al. 2017

Adv Materials Inter

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of proteoglycans and collagen fibrils with high water content (75-80 wt%) has attracted the lubrication with gel materials possessing high mechanical strength [4][5][6][7] and stable low friction. [8][9][10][11][12] These researches aim at shedding light on the gel properties and their potential application as artificial biomaterials.However, such advantages can hardly be realized for industrial uses since solvent (ex. water) in the gels can easily evaporate to lose swelled state. For this purpose, we focused on ionic liquids (ILs) to retain their swelled state. ILs are liquid salts fully composed of cations and anions, generally so-called when their melting temperature is lower than 100 °C. [13] Their high thermal/oxidative stability, negligible volatility, low frictional properties, and facile tenability of these physicochemical properties by their molecular design, [14][15][16] which are the desired characteristics of swelling agents of low frictional gels. In addition, demand for immobilizing ILs on solid surface with keeping their physicochemical properties to fabricate functional devices [17] have opened up the development of gel materials incorporating ILs, so-called as "ion gels" or "ionogels." [18] Ion gels can roughly be classified to physical or chemical gels. [18] In case of physical gels, cross-linking point of their polymer network is formed with relatively weak interaction like hydrophobic interaction, hydrogen bond, π−π interaction and so on, while chemical gels are cross-linked with covalently bonds. There have been several reports studying on tribological behavior of physical ion gels dispersed in ILs. [19][20][21] Espejo et al. characterized the tribological properties of a bucky gel with multiwalled carbon nanotube and 1-ethyl 3-methylimidazolium tosylate. [20] These combination at a tribopair of AISI 316L stainless steel and polycarbonate under 0.98 N at 0.1 m s −1 resulted in COF of 0.025, which is lower than that of a neat IL. In contrast, study on tribological properties of chemical ion gels with sheet-like morphology has not been reported in spite of their high mechanical strength and ease for immobilizing on solid devices.We have recently reported a lubrication system based on ILs and compatible polymer brushes grafted on a Si substrate showed efficient and robust lubrication. [22] They were composed of an ionic liquid, N, N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethylsulfonyl)imide (DEME-TFSI), and high density ionic liquid polymer brushes composed of the derivative of DEME-TFSI with a polymerizable group, Reducing friction is important to improve the lifetime and energy efficiency of mechanical systems. Since human joints with gel-like structure possess a coefficient of friction as low as 10 -3 , gel materials are recognized as a useful example for designing low frictional materials. Ion gels incorporating ionic liquids (ILs) as swelling agent is expected to be stable gel lubricant since high thermal stability and negligible volatility of ILs can maintain swelled sta...

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Section: Doi: 101002/admi201700074mentioning

confidence: 99%

Section: Doi: 101002/admi201700074mentioning

confidence: 99%

Section: Doi: 101002/admi201700074mentioning

confidence: 99%

See 1 more Smart Citation

Highly Robust and Low Frictional Double‐Network Ion Gel

Arafune

Honma

Morinaga

et al. 2017

Adv Materials Inter

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“…In recent years, in order to overcome this drawback, ion gels having a high mechanical strength have been developed. 8,[13][14][15][16][17] However, some of them were prepared using specific chemicals such as triblock copolymer with ionic liquid moiety and tetra-armed polyethylene glycols, 13-14 and the others were prepared via complicated multistep preparation processes. 8,[15][16][17] In our previous work, we developed high-strength ion gels with specific inorganic/organic composite networks 18 using the toughening mechanism of well-known double-network (DN) hydrogels.…”

mentioning

confidence: 99%

“…8,[13][14][15][16][17] However, some of them were prepared using specific chemicals such as triblock copolymer with ionic liquid moiety and tetra-armed polyethylene glycols, 13-14 and the others were prepared via complicated multistep preparation processes. 8,[15][16][17] In our previous work, we developed high-strength ion gels with specific inorganic/organic composite networks 18 using the toughening mechanism of well-known double-network (DN) hydrogels. [19][20][21][22][23][24][25][26][27][28][29] The inorganic/organic composite ion gels could be prepared with tetraethyl orthosilicate (TEOS) and N,N-dimethylacrylamide (DMAAm) via simple one-pot/one-step processing.…”

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confidence: 99%

Inorganic/Organic Double-Network Ion Gels with Partially Developed Silica-Particle Network

2018

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Tough inorganic/organic composite network gels consisting of a partially developed silica-particle network and a large amount of an ionic liquid, named micro-double-network (μ-DN) ion gel, are fabricated via two methods. One is a one-pot/one-step process conducted using a simultaneous network formation via sol-gel reaction of tetraethyl orthosilicate and free radical polymerization of N, N-dimethylacrylamide in an ionic liquid. When the network formation rates of the inorganic and organic networks are almost the same, the μ-DN structure is formed. The second method is simpler and involved the use of silica nanoparticles as the starting material. By controlling the dispersion state of the silica nanoparticles in an ionic liquid, the μ-DN structure is formed. In both μ-DN ion gels, silica nanoparticles partially aggregate and form network-like clusters. When a large deformation is induced in the μ-DN ion gels, the silica-particle clusters rupture and dissipate the loaded energy. The fracture stress and Young's modulus of the μ-DN ion gel increase as the size of the silica nanoparticles decreases. The increment in the mechanical strength would have been caused by the increase in the total van der Waals attraction forces and the total number of hydrogen bonding in the silica-particle networks.

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