6 Non-conventional soft matter

Tschierske, Carsten

doi:10.1039/b101114f

Cited by 229 publications

(115 citation statements)

References 463 publications

(582 reference statements)

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“…In particular, the thermotropic micellar cubic phase was only recently discovered, at first for carbohydrate-based amphiphiles. [16] Although nowadays these mesophases have been found in the phase sequences of several different types of taper-shaped and dendritic amphiphilic molecules [17][18][19][20][21][22][23][24] based on nanosegregation, [25] including the first examples of taper-shaped imidazolium salts (see Scheme 1), [14,26] the design of materials forming these micellar cubic phases is still a challenge. In particular, for the exploration of further applications of imidazole-based ILCs, the study of the LC self-assembly behavior dependent on the molecular structure of these ILCs is essential.…”

Section: Introductionmentioning

confidence: 99%

Self‐Assembly of Imidazolium‐Based Rodlike Ionic Liquid Crystals: Transition from Lamellar to Micellar Organization

Cheng

Xue-qing

Jing

et al. 2010

Chemistry A European J

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By using aryl-amination chemistry, a series of rodlike 1-phenyl-1H-imidazole-based liquid crystals (LCs) and related imidazolium-based ionic liquid crystals (ILCs) has been prepared. The number and length of the C-terminal chains (at the noncharged end of the rodlike core) and the length of the N-terminal chain (on the imidazolium unit in the ILCs) were modified and the influence of these structural parameters on the mode of self-assembly in LC phases was investigated by polarizing microscopy, differential scanning calorimetry, and X-ray diffraction. For the single-chain imidazole derivatives nematic phases (N) and bilayer SmA2 phases were found, but upon increasing the number of alkyl chains the LC phases were lost. For the related imidazolium salts LC phases were preserved upon increasing the number and length of the C-terminal chains and in this series it leads to the phase sequence SmA-columnar (Col)-micellar cubic (CubI /Pm3n). Elongation of the N-terminal chain gives the reversed sequence. Short N-terminal chains prefer an end-to-end packing of the mesogens in which these chains are separated from the C-terminal chains. Elongation of the N-terminal chain leads to a mixing of N- and C-terminal chains, which is accompanied by complete intercalation of the aromatic cores. In the smectic phases this gives rise to a transition from bilayer (SmA2) to monolayer smectic (SmA) phases. For the columnar and cubic phases the segregated end-to-end packing leads to core-shell aggregates. In this case, elongation of the N-terminal chains distorts core-shell formation and removes CubI and Col phases in favor of single-layer SmA phases. Hence, by tailoring the length of the N-terminal chain, a crossover from taper-shaped to polycatenar LC tectons was achieved, which provides a powerful tool for control of self-assembly in ILCs.

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Section: Introductionmentioning

confidence: 99%

Self‐Assembly of Imidazolium‐Based Rodlike Ionic Liquid Crystals: Transition from Lamellar to Micellar Organization

Cheng

Xue-qing

Jing

et al. 2010

Chemistry A European J

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“…In this case the presence of regions of different charge localised away from the centre should allow the simulation of phases where interdigitation, or in general, local structuring occurs [16]. We thus believe that the method can be a useful addition to the set of tools used in the simulations of complex phases, both low molar mass and polymeric ones, particularly the many recently discovered ones based on polyphilic molecules [19], where it is essential to allow for the inhomogeneous distribution of attractive and repulsive sites in the constituent molecules. fig.…”

Section: Discussionmentioning

confidence: 99%

“…different smectic phases with a bilayer, interdigitated or striped molecular arrangements [13]. Some of these structures and of the even more complex phases based on polyphilic mesogens recently discovered [19] would probably be impossible to obtain without considering a realistic distribution of the charges.…”

Section: Introductionmentioning

confidence: 99%

Mimicking electrostatic interactions with a set of effective charges: a genetic algorithm

Berardi

Muccioli

Orlandi

et al. 2004

Chemical Physics Letters

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“…One of the most prominent characteristics introduced through this process is the formation of liquid crystals from nonmesogenic precursors. [1][2][3][4][5][6][7] A wide variety of mesogenic shapes (calamitic, discotic, banana-shaped, and bowlic mesogens) [8][9][10][11] and structures (small molecule, main-chain polymers, side-chain polymers, and networks) [12][13][14][15] have been created through these noncovalent interactions.…”

Section: Introductionmentioning

confidence: 99%

Naphthoic acid derivatives as hydrogen bond donors in supramolecular materials

Riedel

Kumpfer

Rogness

et al. 2006

J of Applied Polymer Sci

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The synthesis of a series of 6-hydroxy-2-naphthoic acid derivatives is described. These have been used to form supramolecular main-chain liquid crystalline polymers. These hydrogen bond donors are complexed with a series of bisfunctionalized rigid pyridine species. These associative chain structures were analyzed through differential scanning calorimetry and polarizing light thermal optical microscopy. The liquid crystalline phases formed displayed mainly enantiotropic nematic phases that display an increase in clearing temperature as the rigid portions of the supramolecular system increased in length. A decrease in the clearing temperature was observed as the length of the flexible spacer group increased. Both of these observations follow established trends in liquid crystalline behavior.

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6 Non-conventional soft matter

Cited by 229 publications

References 463 publications

Self‐Assembly of Imidazolium‐Based Rodlike Ionic Liquid Crystals: Transition from Lamellar to Micellar Organization

Self‐Assembly of Imidazolium‐Based Rodlike Ionic Liquid Crystals: Transition from Lamellar to Micellar Organization

Mimicking electrostatic interactions with a set of effective charges: a genetic algorithm

Naphthoic acid derivatives as hydrogen bond donors in supramolecular materials

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