Imidazolium camphorsulfonamides: Chiral catanionic liquid crystals with tunable thermal properties

Rettenmeier, Eva; Tokarev, Alexey; Blanc, Christophe; Dieudonné, Philippe; Guari, Yannick; Hesemann, Peter

doi:10.1016/j.jcis.2011.01.055

Cited by 14 publications

(8 citation statements)

References 56 publications

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“…1-3 LLC can be used as a template to synthesize or assemble nonfunctional materials, which has received widespread attention. [10][11][12] Therefore, long-chain alkyl-imidazollium ionic liquids has become hotspots in research fields due to its rich phase behavior. Except for traditional surfactants, long-chain alkyl ionic liquids are special kinds of amphiphilic surfactant molecules which can also form LC.…”

Section: Introductionmentioning

confidence: 99%

“…9 In addition the other properties are diverse due to their purely ionic character, such as low combustibility, excellent thermal stability, wide liquid regions, and favorable solvating properties. [10][11][12] Therefore, long-chain alkyl-imidazolium ionic liquids has become hotspots in research elds due to its rich phase behavior. [13][14][15] For example, Zhang et al investigated the phase behavior of C 8 mimCl/H 2 O/alcohols (1-hexanol, 1-octanol, 1-decanol, and 1-dodecanol) at 25 C, the lamellar phases were found in all systems, and the length of alkyl chain of alcohols on the impact of LLC structures were also discussed.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of graphene oxide into C₁₂E₄/C₁₂mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

et al. 2015

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Graphene oxide (GO) was successfully incorporated into a hybrid lyotropic liquid crystal (LLC) matrix formed by two kinds of surfactants n-dodecyl tetraethylene monoether (C 12 E 4 ) and 1-dodecyl-3-methylimidazolium bromide ionic liquid (C 12 mimBr). By changing the ratios of C 12 E 4 and C 12 mimBr, two types of C 12 E 4 /C 12 mimBr LLC matrixes (lamellar and hexagonal phase) were formed and the effects of the concentration of GO and temperature on the properties of GO/C 12 E 4 /C 12 mimBr LLC composites were systematically investigated by polarized optical microscopy (POM) observations, small-angle X-ray scattering (SAXS) and rheological measurement. Both POM observations and SAXS results indicated that GO can be well-dispersed in the hybrid LLC matrixs at room temperature. Moreover, after the incorporation of GO, the temperature tolerance of

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Incorporation of graphene oxide into C₁₂E₄/C₁₂mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

et al. 2015

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“…One of the most fascinating advantages of ILCs is that anisotropic structural organizations of ILCs can be adjusted by the appropriate choice of the length of the alkyl chains, mesogens, and ions. However, little report was presented for the ER properties of ILCs despite that many ILCs have been synthesized in previous work involving different cations such as imidazolium, pyridinium, pyrrolidinium, quaternary ammonium and quaternary phosphonium salts, and different anions such as halide ion, BF 4 − , PF 6 − , and CF 3 SO 3 − …”

Section: Introductionmentioning

confidence: 99%

Imidazolium-based polymerized ionic liquid crystals containing fluorinated cholesteryl mesogens

Luo

Zhao

et al. 2015

Polym. Adv. Technol.

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A series of polymerized ionic liquid crystals (PILCs) bearing fluorinated cholesteryl mesogens were synthesized in this work, which include polymerized imidazolium bromides (PIBs) and polymerized imidazolium hexafluorophosphates (PIHs). The PIBs were synthesized using alkyl bromine-containing polysiloxanes and 1butyl-1H-imidazole, and the PIHs were synthesized by anion metathesis reaction using the corresponding PIBs and KPF 6 . The chemical structures, liquid crystalline (LC) properties, and electrorheological (ER) effect of these PILCs were characterized by use of various experimental techniques. All the PILCs showed smectic A mesophase on heating and cooling cycles. The smectic layer structure of these PILCs are originated from the rigid fluorinated cholesteryl mesogens and the flexible moieties in the LC phase, but the ion pairs (imidazolium cations-PF 6 À , Im + -PF 6 À ; or imidazolium cations-Br À , Im + -Br À ) can disperse in the polysiloxane matrix and expand the d-spacing in the smectic layers. The PIHs show lower T g and T i than the corresponding precursor PIBs, which is due to the larger ion volume of Im + -PF 6 À for PIHs than that of Im + -Br À for PIBs. A series of 40 V% ER fluids were prepared by mixing the PILCs with polydimethylsiloxane (PDMS), and the ER behaviors were studied. All the PILC/PDMS fluids showed ER effect, and the PIH/PDMS fluids show a little greater ER effect than the PIB/PDMS fluids. The PILC droplets in the ER fluids become deformed owing to both the orientation of fluorinated cholesteryl mesogens and the suppression of ionic migration when a DC electric field was applied, resulting in the occurrence of ER effect.Transition temperatures (°C) and enthalpies (J g À1 , in parenthesis) were determined at a scanning rate of 2°C min À1 . b Determined by XRD analysis on heating to 80°C. J. LUO ET AL.wileyonlinelibrary.com/journal/pat Figure 8. Electrorheological effect for some ER fluids under various share rates: (a) [P3-Im]Br at 80°C; (b) [P3-Im]Br at 0°C; (c) [P3-Im]PF 6 at 80°C; (d) [P3-Im]PF 6 at 0°C; (e) Br-P3 at 80°C; and (f) Br-P3 at 0°C.

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“…[15] Many other cations and anions have been used to obtain ILCs. The reported cations include pyridinium, [16,17] imidazolium [18,19] pyrrolidinium, [20,21] quaternary ammonium and quaternary phosphonium salts, [22,23] and the anions include halide ion, BF 4 − , PF 6 − , CF 3 SO 3 − and so on. [24][25][26] Some ILs can show mesomorphic properties and become liquid crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of imidazolium-based ionic liquid crystals bearing a cholesteryl mesogenic group

Lan

et al. 2014

Liquid Crystals

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2014) Synthesis and characterisation of imidazolium-based ionic liquid crystals bearing a cholesteryl mesogenic group, Liquid Crystals, 41:12, 1843-1853, A series of cholesteryl-containing imidazolium chlorides and imidazolium tetrachloroaluminates were synthesised, and the chemical structure, liquid crystalline behaviour and ionic conductivity were characterised by several technical methods. Whereas the imidazolium chlorides show chiral smectic A (SmA*) phase on heating and cooling cycles, the imidazolium tetrachloroaluminates display chiral nematic (N*) phase, which is uncommon for ionic liquid crystals (ILCs). The imidazolium chlorides display similar phase transition temperature and entropy, indicating the cholesteryl component influence predominately on the phase transition rather than the different alkyl substituent groups. The imidazolium tetrachloroaluminates show lower melting point temperatures and lower clear point temperature than the imidazolium chlorides. The mesophases exist at rather moderate temperatures. Non-mesomorphic imidazolium tetrachloroaluminate(III) salts with short alkyl substituents have been known for a long time, and the synthesised imidazolium tetrachloroaluminates are the first examples of tetrahalogenoaluminate(III)-containing ILCs. For the imidazolium tetrachloroaluminates, imidazolium cations combine loosely with AlCl 4 − ions because AlCl 4 − ions are large and occupy more space in spite of the hydrogen bond and electrostatic attraction interaction, indicating that the layer structure can be destroyed easily to form N* phase on heating.

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Imidazolium camphorsulfonamides: Chiral catanionic liquid crystals with tunable thermal properties

Cited by 14 publications

References 56 publications

Incorporation of graphene oxide into C₁₂E₄/C₁₂mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

Incorporation of graphene oxide into C₁₂E₄/C₁₂mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

Imidazolium-based polymerized ionic liquid crystals containing fluorinated cholesteryl mesogens

Synthesis and characterisation of imidazolium-based ionic liquid crystals bearing a cholesteryl mesogenic group

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Imidazolium camphorsulfonamides: Chiral catanionic liquid crystals with tunable thermal properties

Cited by 14 publications

References 56 publications

Incorporation of graphene oxide into C12E4/C12mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

Incorporation of graphene oxide into C12E4/C12mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

Imidazolium-based polymerized ionic liquid crystals containing fluorinated cholesteryl mesogens

Synthesis and characterisation of imidazolium-based ionic liquid crystals bearing a cholesteryl mesogenic group

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Incorporation of graphene oxide into C₁₂E₄/C₁₂mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

Incorporation of graphene oxide into C₁₂E₄/C₁₂mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties