Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

Özğan, Şükrü; Eskalen, Hasan; Tapkıranlı, Yusuf

doi:10.1007/s40094-018-0307-y

Cited by 25 publications

(10 citation statements)

References 35 publications

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“…Moreover, Lapanik et al reported a 30-50% reduction of the threshold voltage and switching time in partially reduced graphene oxide (PRGO)-doped nematic LCs and a 20-25% increment of the spontaneous polarization in PRGO-doped ferroelectric LCs [228]. Ozgan et al found that the dielectric anisotropy of nematic LC (6CB) would be increased with an increasing concentration of GO [115]. In a very recent investigation, Mrukiewicz et al systematically investigated the physical properties of nematic LC (5CB) dispersed with GO at a wide concentration range from 0.05 to 0.3 wt %.…”

Section: Modification Of Physical Properties Of Lc Materials By Nanodmentioning

confidence: 99%

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Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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The research field of liquid crystals and their applications is recently changing from being largely focused on display applications and optical shutter elements in various fields, to quite novel and diverse applications in the area of nanotechnology and nanoscience. Functional nanoparticles have recently been used to a significant extent to modify the physical properties of liquid crystals by the addition of ferroelectric and magnetic particles of different shapes, such as arbitrary and spherical, rods, wires and discs. Also, particles influencing optical properties are increasingly popular, such as quantum dots, plasmonic, semiconductors and metamaterials. The self-organization of liquid crystals is exploited to order templates and orient nanoparticles. Similarly, nanoparticles such as rods, nanotubes and graphene oxide are shown to form lyotropic liquid crystal phases in the presence of isotropic host solvents. These effects lead to a wealth of novel applications, many of which will be reviewed in this publication. the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About 25 different thermotropic phases are known to date, and they are still increasing in number. Appl. Sci. 2019, 9, x FOR PEER REVIEW 2 of 47 unique effects of the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About...

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Section: Modification Of Physical Properties Of Lc Materials By Nanodmentioning

confidence: 99%

“…In fact, it could be shown that the nanotubes can be reoriented elastically by reorienting the director through applied electric or magnetic fields. Fullerenes could effectively improve the switching speed of a nematic host LC [95], and improved electro-optic responses could be induced by doping graphene oxides in LCs [115].…”

Section: Introductionmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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“…A wide range of nanodopants has been used in studies on PLLCs including ferroelectric, 13 metal, 14 metal oxide 15 nanoparticles, quantum dots, 16 and carbon nanomaterials such as fullerenes, 17 carbon nanotubes, 18 and graphene oxide flakes. 19 For all cases, an improvement not only in the electro-optic but also in physical properties has been reported in many articles. For example, it has been shown that the threshold voltage and response times can be lowered; the dielectric anisotropy can be increased enhancing the effective anisotropy of the system; the nematic–isotropic phase transition temperature often becomes higher increasing the stability of the nematic phase.…”

Section: Introductionmentioning

confidence: 91%

Electro-optic properties of polystyrene particle-laden polymer-stabilized liquid crystals

Gruzdenko

Dierking

2023

J. Mater. Chem. C

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“…Literatürde bu amaçla metalik nanopartiküller (Kobayashi et al 2006), ferromanyetik nanopartiküller (Okutan et al 2012), yarı iletken nanopartiküller (Zharkova and Streltsov 2020) ve karbon nanomalzemeler (Lee and Chiu 2001;Lee, Gau, and Chen 2005) gibi farklı tipte nanomalzemeler kullanılmaktadır. Özgan ve ark heksilsiyanobifenil sıvı kristaline grefen oksit nanoparçacık katkılandırarak ısısal ve elektro-optik özelliklerini incelemişlerdir (Özgan, Eskalen, and Tapkıranlı 2018). Karbon kuantum noktaları nematik sıvı kristale in elektro-optik performansına etkisi incelendi (Eskalen 2020).…”

Section: Introductionunclassified

Çi̇nko Oksi̇t Nanoparçacik Sentezlenmesi̇ Ve E7 Nemati̇k Sivi Kri̇stali̇ni̇n Di̇elektri̇k Ve Kapasi̇tansa Etki̇si̇

Özğan

Betül

2022

Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi

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Bu çalışmada hidrotermal yöntem kullanılarak Çinko Oksit (ZnO) nanoparçacık sentezlendi. Sentezlenen ZnO nanoparçacık geçirimli elektron mikroskobu ve x-ışınları ile karakterizasyonu yapıldı. ZnO nanoparçacık, E7 nematik sıvı kristaline farklı oranlarda katkılanarak numuneler elde edildi. Bu numunelerin gerçek ve sanal dielektrik sabiti ve mutlak kapasitans değişimleri 100 Hz-15 MHz frekans aralığında oda sıcaklığında incelenmiştir. Gerçek dielektrik belli frekansa kadar sabit gibi çok az azalarak değiştiği, 0.8 MHz frekansa gelince birden bire azalarak sıfır olduğu, nanoparçacık katkı oran ile arttığı tespit edilmiştir. Sanal dielektrik kısmı düşük frekanslarda azalmakta, sonra sabit gibi davranıyor ve daha yüksek frekansta artarak yaklaşık 2 MHz frekans civarında pik yapar ve azalarak sıfıra gidiyor. Sıvı kristalin dielektrik ve kapasitans değerleri % 0.6 ZnO nanoparçacık katkı oranında en büyük değişim göstermektedir.

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Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

Cited by 25 publications

References 35 publications

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Electro-optic properties of polystyrene particle-laden polymer-stabilized liquid crystals

Çi̇nko Oksi̇t Nanoparçacik Sentezlenmesi̇ Ve E7 Nemati̇k Sivi Kri̇stali̇ni̇n Di̇elektri̇k Ve Kapasi̇tansa Etki̇si̇

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