Aqueous gelation of ionic liquids: reverse thermoresponsive ion gels

Ribot, Josep Casamada; Guerrero‐Sánchez, Carlos; Hoogenboom, Richard; Schubert, Ulrich S.

doi:10.1039/c0cc01671c

Cited by 48 publications

(37 citation statements)

References 45 publications

(51 reference statements)

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“…28,29 Schubert et al found the thermoreversible gelation of an amphiphilic quaternary ammonium-type ionic liquid/water mixture, which exhibited high conductivity probably due to the controllable water content and the additional inorganic salts. [30][31][32] We also reported the gelation of ionic liquids using novel low-molecular-weight gelators and revealed that the gelation did not affect the ionic conductivities of ionic liquids. 23,24 Yanagida et al demonstrated the feasibility of ionogels to the solid-state dye-sensitized solar cells using a lowmolecular-weight gelator.…”

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confidence: 93%

Highly Conductive Ionic-Liquid Gels Prepared with Orthogonal Double Networks of a Low-Molecular-Weight Gelator and Cross-Linked Polymer

Kataoka

Ishioka

Mizuhata

et al. 2015

ACS Appl. Mater. Interfaces

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We prepared a heterogeneous double-network (DN) ionogel containing a lowmolecular-weight gelator network and a polymer network that can exhibit high ionic conductivity and high mechanical strength. An imidazolium-based ionic liquid was first gelated by the molecular self-assembly of a low-molecular-weight gelator (benzenetricarboxamide derivative), and methyl methacrylate was polymerized with a cross-linker to form a cross-linked poly(methyl methacrylate) (PMMA) network within the ionogel. Microscopic observation and calorimetric measurement revealed that the fibrous network of the low-molecular-weight gelator was maintained in the DN ionogel. The PMMA network strengthened the ionogel of the lowmolecular-weight gelator and allowed us to handle the ionogel using tweezers. The orthogonal DNs produced ionogels with a broad range of storage elastic moduli. DN ionogels with low PMMA concentrations exhibited high ionic conductivity that was comparable to that of a neat ionic liquid. The present study demonstrates that the ionic conductivities of the DN and singlenetwork, low-molecular-weight gelator or polymer ionogels strongly depended on their storage elastic moduli.

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confidence: 93%

Highly Conductive Ionic-Liquid Gels Prepared with Orthogonal Double Networks of a Low-Molecular-Weight Gelator and Cross-Linked Polymer

Kataoka

Ishioka

Mizuhata

et al. 2015

ACS Appl. Mater. Interfaces

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“…As variability in their application potential arises from the availability of a range of ILs molecules with various combinations of anions, cations, hydrophilic head groups, and hydrophobic chain lengths [1][2][3][4][5][6]. It has been adequately realized that ILs are the green solvents of the future.…”

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confidence: 99%

Electrochemical response of agar ionogels towards glucose detection

et al. 2015

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We have reported a sensing platform comprising of agar ionogel (IGs) made in ionic liquid solutions (1-octyl-3-methyl imidazolium chloride [C8mim][Cl] and 1-ethyl-3-methyl imidazolium chloride [C2mim][Cl]) and used it for glucose oxidase (GOx) immobilization for glucose detection. The ionogels were deposited onto indium tin oxide (ITO) coated glass plate using the drop casting technique. These Agar-[C8mim][Cl]/ITO (Ag-C8/ITO) and Agar-[C2mim][Cl]/ITO (Ag-C2/ITO) substrates were used for immobilization of GOx, which was selected as a model enzyme to investigate its interaction with these electrodes using electrochemical techniques. Structural and morphological studies of these GOx/Ag-C8/ITO and GOx/Ag-C2/ITO electrodes were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and electrochemical techniques (CV). These GOx/Ag-C8/ITO and GOx/Ag-C2/ITO bioelectrodes exhibited improved glucose detection capability in the concentration range of 0.27-16.7 mM and 0.28-5.6 mM with sensitivity ≈ 4.1µA mM -1 /cm -2 and 14.6 µA mM -1 cm -2 , respectively. The value of apparent Michaelis-Menten constant (K m ) was 0.023 mM and 0.0007 mM for the aforesaid two cases respectively. It is shown that, customization of agar hydrogels in green solvent medium widens the scope of its potential applications as glucose sensing in real samples. IntroductionRecently, ionic liquids (ILs) have received much attention as materials with enormous practical applications because of their unique properties that include exceptional ionic conductivity, biocompatibility, electrochemical, thermal stability and non-flammability making them particularly attractive in the development of electrochemical biodevices with long-term stability.As variability in their application potential arises from the availability of a range of ILs molecules with various combinations of anions, cations, hydrophilic head groups, and hydrophobic chain lengths [1-6]. It has been adequately realized that ILs are the green solvents of the future. The novel and remarkable attributes of ILs can be realized from the following facts:(i) ILs can dissolve cellulose [7], (ii) maintain biological activity of DNA in solutions over an extended period [8] and (iii) inhibit pH dependent aggregation of proteins [9]. Moreover ionic liquids are room-temperature molten salts that are increasingly used in electrochemical devices, such as in batteries, fuel cells, and biosensors [10]. The ILs has been used for the different biosensing application because ILs increases the stability of biomolecules and also improves the sensitivity and response time of biosensor [11-12]. ILs is being used for development of different electrochemical biosensor for clinical diagnosis including glucose detection. Liu et al. have reported hydrolysis of tetraethyl orthosilicate in 1-butyl-3-methylimidazolium tetra-fluoroborate (BMIMBF4) based hydrogen peroxide electrochemical biosensor [13]. They have reported that in BMIMBF4, IL improved the film quality without forming a...

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“…[1] In the past few years, the utilization of ILs for the design of advanced materials and polymer-based physical-chemical systems has been studied widely. [7] The design and synthesis of low molar mass gelators are also effective methods. [4] Currently, ILs are usually either gelled with polymers, [5] incorporated with inorganic substances (silica nanoparticles and carbon nanotubes), [6] or mixed with other ILs to prepare IL-based gels.…”

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One‐Step Synthesis of Thermosensitive Nanogels Based on Highly Cross‐Linked Poly(ionic liquid)s

et al. 2012

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Aqueous gelation of ionic liquids: reverse thermoresponsive ion gels

Abstract: The aqueous gelation of a quaternary ammonium oligo(propylene oxide)-based ionic liquid yields ion gels with a reverse thermoresponsive behavior (i.e., mechanical moduli and viscosity increase with temperature) and enhanced ionic conductivities.

Cited by 48 publications

References 45 publications

Highly Conductive Ionic-Liquid Gels Prepared with Orthogonal Double Networks of a Low-Molecular-Weight Gelator and Cross-Linked Polymer

Highly Conductive Ionic-Liquid Gels Prepared with Orthogonal Double Networks of a Low-Molecular-Weight Gelator and Cross-Linked Polymer

Electrochemical response of agar ionogels towards glucose detection

One‐Step Synthesis of Thermosensitive Nanogels Based on Highly Cross‐Linked Poly(ionic liquid)s

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