Enhanced, parallel liquid crystal alignment based on polystyrene substituted with phthalimidoyl groups

Kim, Tae-Hyung; Ju, Changha; Park, Chanhyuk; Kang, Hyo

doi:10.1039/c9ra01131e

Cited by 4 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may be attributed to p-p interactions between phenyl rings of 5CB and PFO or PFH. [62][63][64][65] On the other hand, the aliphatic chains appended to polymer PEO, and PEH undergoes repulsion with hydrophobic 5CB molecules. 66,67 As a result, tangential alignment is acquired by the 5CB molecule at the polymer boundary so that a lesser number of 5CB molecules remains in contact with the polymer interface.…”

Section: Resultsmentioning

confidence: 99%

Liquid crystal droplet design by using pseudopeptidic bottlebrush polymer additives

et al. 2022

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Liquid crystal droplet design by using pseudopeptidic bottlebrush polymer additives

et al. 2022

View full text Add to dashboard Cite

show abstract

“…At the LC-solid interface, the alignment layers such as siloxane, aliphatic chain, and oligonucleotides favor the perpendicular alignment of the molecules, [88,89] while the parallel ravine prepared by etching techniques and polyimide (PI) treated by directed rubbing can lead to parallel alignment. [90,91] In addition, at the LC-aqueous interface, the LC alignment can be tuned by varying the components of the aqueous phase. For example, common surfactants such as octadecy trimethyl ammonium bromide (OTAB) and sodium dodecyl sulfate (SDS) favor the perpendicular alignment due to the hydrophobic interaction between the surfactants and the LC molecules.…”

Section: Alignmentsmentioning

confidence: 99%

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

2022

Advanced Photonics Research

View full text Add to dashboard Cite

Liquid crystals (LCs) are nanophotonic materials which can interact with light in the molecular scale. While the LCs are widely used in various displays, last decade has witnessed emerging applications of the LCs for nondisplays. Based on the unique stimuli–responsive property and optical property, the applications of the LCs in the field of sensors are widely explored. In addition, ions are widely distributed in nature and bionts, playing critical roles in many physiological activities and ecological cycles. Appropriate amount of ions is beneficial to the human body, while the excess ions can cause irreversible damages. As a result, a variety of LC sensors are proposed to detect the ion concentration in both body fluids and water samples. This article reviews the design principles, applications, and existing problems of the LC ion sensors. The geometries, alignments, and optical signals of the sensors, which can guide the design of the devices, are first discussed. Afterward, two types of LC ion sensors aiming at detecting metal ions and nonmetallic ions, respectively, are illustrated. Finally, the current challenges and potential development directions of the LC ion sensors are introduced briefly.

show abstract

“…In addition, PS derivatives with enhanced thermal properties can be obtained through copolymerization with methyl methacrylate [ 70 ], acrylonitrile [ 71 ], divinylbenzene [ 72 ], and trivinylbenzene [ 73 ], etc., or by incorporating specific moieties or functional groups into the side chain of polystyrene. For example, the introduction of coumarin as a dye [ 74 ], oryzanol as a plant extraction resource [ 75 ], and the imide moieties [ 76 ] into the side chain of polystyrene improves the T g value. PS derivatives have been enhanced via a simple polymer reaction to produce vertical LC orientation layers for next-generation applications owing to their advantages, such as low-temperature processability and good solubility in many organic solvents [ 77 ].…”

Section: Introductionmentioning

confidence: 99%

Alignment Layer of Liquid Crystal Using Plant-Based Isoeugenol-Substituted Polystyrene

2021

Self Cite

View full text Add to dashboard Cite

We synthesized a series of renewable and plant-based isoeugenol-substituted polystyrenes (PIEU#, # = 100, 80, 60, 40, and 20, where # is the molar percent content of isoeugenol moiety), using polymer modification reactions to study their liquid crystal (LC) alignment behavior. In general, the LC cells fabricated using polymer film with a higher molar content of isoeugenol side groups showed vertical LC alignment behavior. This alignment behavior was well related to the surface energy value of the polymer layer. For example, vertical alignments were observed when the polar surface energy value of the polymer was smaller than approximately 3.59 mJ/m2, generated by the nonpolar isoeugenol moiety with long and bulky carbon groups. Good alignment stability at 100 °C and under ultraviolet (UV) irradiation of 15 J/cm2 was observed for the LC cells fabricated using PIEU100 as a LC alignment layer. Therefore, renewable isoeugenol-based materials can be used to produce an eco-friendly vertical LC alignment system.

show abstract

Enhanced, parallel liquid crystal alignment based on polystyrene substituted with phthalimidoyl groups

Abstract: Polystyrene substituted with phthalimide can enhance liquid crystal alignment behavior and stability and switch orientation direction from perpendicular to parallel.

Cited by 4 publications

References 24 publications

Liquid crystal droplet design by using pseudopeptidic bottlebrush polymer additives

Liquid crystal droplet design by using pseudopeptidic bottlebrush polymer additives

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

Alignment Layer of Liquid Crystal Using Plant-Based Isoeugenol-Substituted Polystyrene

Contact Info

Product

Resources

About