Special Issue Editorial: Current Advances in Liquid Crystals

The broad field of liquid crystals (LCs) has attracted the attention of chemists, physicists, biologists and engineers alike since the discovery of liquid crystalline phase by the Austrian botanist Friedrich Reinitzer in 1888 [...]

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Multifunctional Materials via Molecular Self-Organization into Liquid-Crystalline Phase

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.165 ◽

2008 ◽

Vol 47-50 ◽

pp. 165-168 ◽

Cited By ~ 1

Author(s):

Suk Wah Tam-Chang ◽

Delfin Mahinay ◽

Li Ming Huang

Keyword(s):

Liquid Crystals ◽

Organic Compound ◽

Crystalline Phase ◽

Liquid Crystalline ◽

Liquid Crystalline Phase ◽

Self Organization ◽

Local Order ◽

Self Organized ◽

Polymer Template ◽

Micrometer Scale

In this paper, we described the synthesis of N,N’-di-(2-ammoniumethyl)perylene- 3,4,9,10-bis(dicarboximide) ditrifluoroacetate (1), an ionic organic compound that self-organized to give chromonic liquid crystals and anisotropic crystals. Using a polymer template with micrometer-scale features to direct the ordered arrangement of 1, patterned structure with micrometer-scale local order was fabricated. The anisotropic (direction-dependent) properties of the crystals and micropatterns of 1 were investigated.

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Two-Dimensional Superlattice Self-Formed by Novel Ionic Liquid Crystals and Its Photofunctional Property

MRS Proceedings ◽

10.1557/proc-559-201 ◽

1999 ◽

Vol 559 ◽

Cited By ~ 2

Author(s):

A. Kanazawa ◽

T. Ikeda

Keyword(s):

Liquid Crystals ◽

Crystalline Phase ◽

Liquid Crystalline ◽

Chloride Ions ◽

Liquid Crystalline Phase ◽

Two Dimensional ◽

Phosphonium Salts ◽

Smectic A ◽

Transition Behavior ◽

Smectic A Phase

ABSTRACTThermotropic liquid-crystalline behavior of various complex salts, which are structurally simple amphiphiles without rigid cores, was evaluated by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffractometry. The phosphonium salts, consisting of positive phosphorus and negative chloride ions, were found to show a smectic A phase in which a homeotropic structure was formed spontaneously. It is significant that the phosphonium salts possess an advantageous feature as thermotropic liquid crystals and show a stable liquid-crystalline phase and a simple phase transition behavior in comparison with commonly available ammonium analogs. Furthermore, the introduction of divalent metal ions into the amphiphiles was revealed to result in enhancement of the thermal properties. Although the ammonium chlorides as parent compounds showed no liquid-crystalline phase (or indistinct transition behavior), the ammonium complexes possessing tetrachlorometalate ions exhibited clearly the smectic A phase in the expanded temperature range. Additionally, through the evaluation of dipolar alignment in the solid-state phosphonium assembly by second harmonic generation, it was assumed that the self-assembly can be regarded as layered polar thin films produced by two-dimensional ionic layers with an overall permanent electric polarization.

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Columnar liquid crystals in oligosaccharide derivatives. II. Two types of discotic columnar liquid-crystalline phase of cellobiose alkanoates

Liquid Crystals ◽

10.1080/02678299208030401 ◽

1992 ◽

Vol 12 (2) ◽

pp. 337-345 ◽

Cited By ~ 20

Author(s):

A. Takada ◽

T. Fukuda ◽

T. Miyamoto ◽

Y. Yakoh ◽

J. Watanabe

Keyword(s):

Liquid Crystals ◽

Crystalline Phase ◽

Liquid Crystalline ◽

Liquid Crystalline Phase

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A stabilized lamellar liquid crystalline phase with aggregation-induced emission features based on pyrrolopyrrole derivatives

Materials Chemistry Frontiers ◽

10.1039/c9qm00124g ◽

2019 ◽

Vol 3 (6) ◽

pp. 1105-1112 ◽

Cited By ~ 4

Author(s):

Shuangxiong Dai ◽

Zhengxu Cai ◽

Zhe Peng ◽

Zhi Wang ◽

Bin Tong ◽

...

Keyword(s):

Liquid Crystals ◽

Crystalline Phase ◽

Liquid Crystalline ◽

Liquid Crystalline Phase ◽

Aggregation Induced Emission ◽

Lamellar Structures ◽

Active Liquid

A series of novel AIE-active liquid crystals were prepared, which exhibited stabilized and well-organized lamellar structures in the LC phase.

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A 1,6-Diphenylpyrene-Based, Photoluminescent Cyclophane Showing a Nematic Liquid-Crystalline Phase at Room Temperature

Crystals ◽

10.3390/cryst9020092 ◽

2019 ◽

Vol 9 (2) ◽

pp. 92 ◽

Cited By ~ 2

Author(s):

Yoshimitsu Sagara ◽

Tatsuya Muramatsu ◽

Nobuyuki Tamaoki

Keyword(s):

Liquid Crystals ◽

Crystalline Phase ◽

Nematic Phase ◽

Liquid Crystalline ◽

Room Temperature ◽

Liquid Crystalline Phase ◽

Condensed State ◽

Liquid Crystalline Phases ◽

Potential Applications ◽

Blue Photoluminescence

Photoluminescent nematic liquid crystals have been an attractive research target for decades, because of their potential applications in optoelectrical devices. Integration of luminescent motifs into cyclic structures is a promising approach to induce low-ordered liquid-crystalline phases, even though relatively large and rigid luminophores are used as emitters. Here, we demonstrate a 1,6-diphenylpyrene-based, unsymmetric cyclophane showing a stable nematic phase at room temperature and exhibiting strong photoluminescence from the condensed state. The observed sky-blue photoluminescence was dominated by the emission species ascribed to assembled luminophores rather than monomers.

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Electron transfer studies of a conventional redox probe in human sweat and saliva bio-mimicking conditions

Scientific Reports ◽

10.1038/s41598-021-86866-z ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

P. Krishnaveni ◽

V. Ganesh

Keyword(s):

Electron Transfer ◽

Crystalline Phase ◽

Liquid Crystalline ◽

Transfer Reaction ◽

Electron Transfer Reaction ◽

Redox Couple ◽

Liquid Crystalline Phase ◽

Transfer Reactions ◽

Redox Probe ◽

Human Sweat

AbstractModern day hospital treatments aim at developing electrochemical biosensors for early diagnosis of diseases using unconventional human bio-fluids like sweat and saliva by monitoring the electron transfer reactions of target analytes. Such kinds of health care diagnostics primarily avoid the usage of human blood and urine samples. In this context, here we have investigated the electron transfer reaction of a well-known and commonly used redox probe namely, potassium ferro/ferri cyanide by employing artificially simulated bio-mimics of human sweat and saliva as unconventional electrolytes. Typically, electron transfer characteristics of the redox couple, [Fe(CN)6]3−/4− are investigated using electrochemical techniques like cyclic voltammetry and electrochemical impedance spectroscopy. Many different kinetic parameters are determined and compared with the conventional system. In addition, such electron transfer reactions have also been studied using a lyotropic liquid crystalline phase comprising of Triton X-100 and water in which the aqueous phase is replaced with either human sweat or saliva bio-mimics. From these studies, we find out the electron transfer reaction of [Fe(CN)6]3−/4− redox couple is completely diffusion controlled on both Au and Pt disc shaped electrodes in presence of sweat and saliva bio-mimic solutions. Moreover, the reaction is partially blocked by the presence of lyotropic liquid crystalline phase consisting of sweat and saliva bio-mimics indicating the predominant charge transfer controlled process for the redox probe. However, the rate constant values associated with the electron transfer reaction are drastically reduced in presence of liquid crystalline phase. These studies are essentially carried out to assess the effect of sweat and saliva on the electrochemistry of Fe2+/3+ redox couple.

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