期刊
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
卷 9, 期 -, 页码 155-163出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.9.18
关键词
cellulose nanocomposite; dielectric spectroscopy; impedance spectroscopy; liquid crystal; optical transmission
资金
- FCT - Portuguese Foundation or Science and Technology [POCI-01-0145-FEDER-007688, UID/CTM/50025, PTDC/FIS-NAN/0117/2014]
- Romanian Ministry of Education and Research [PN16-480101]
- FEDER funds through the COMPETE Program
Electro-optical devices that work in a similar fashion as PDLCs (polymer-dispersed liquid crystals), produced from cellulose acetate (CA) electrospun fibers deposited onto indium tin oxide coated glass and a nematic liquid crystal (E7), were studied. CA and the CA/liquid crystal composite were characterized by multiple investigation techniques, such as polarized optical microscopy, dielectric spectroscopy and impedance measurements. Dielectric constant and electric energy loss were studied as a function of frequency and temperature. The activation energy was evaluated and the relaxation time was obtained by fitting the spectra of the dielectric loss with the Havriliak-Negami functions. To determine the electrical characteristics of the studied samples, impedance measurements results were treated using the Cole-Cole diagram and the three-element equivalent model.
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