Determination of optical and dielectric parameters of cholesteric liquid crystals: the study on chiral dopant concentration effect
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, optical and dielectric parameters of cholesteric liquid crystals were investigated. 4-pentyl-4 '-cyanobiphenyl nematic liquid crystal and 4 '-[(S)-2-methylbutyl]biphenyl-4-carbonitrile right-handed chiral dopant materials were used in the preparation of cholesteric liquid crystals. Furthermore, so as to determine the influence of chiral dopant, three samples were formed by combining 4-pentyl-4 '-cyanobiphenyl and 4wt.%, 8wt.%, and 16wt.% 4 '-[(S)-2-methylbutyl]biphenyl-4-carbonitrile. Optical parameters, such as wavelength-dependent transmittance and absorbance, were obtained with Ultraviolet/Visible spectroscopy. Dielectric parameters were also determined with dielectric spectroscopy. An increase in the value of dielectric constant for 1 kHz from 4.486 to 5.774 was observed with the increasing 4 '-[(S)-2-methylbutyl]biphenyl-4-carbonitrile concentration. Moreover, an increase in optical band gap value from 3.791 to 3.801 eV was seen with increasing 4 '-[(S)-2-methylbutyl]biphenyl-4-carbonitrile concentration. Results indicated substantial changes in optical and dielectric parameters depending on chiral dopant concentration. In this regard, it is considered that current study will contribute insight to scientists who continue their research on optical and dielectric characterizations of cholesteric liquid crystal-based composites and its technological applications.
Açıklama
Anahtar Kelimeler
Kaynak
Journal of Materials Science-Materials in Electronics
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
35
Sayı
31
