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Electro-optical and dielectric prope...

Huang, Yuan Ming.

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Electro-optical and dielectric properties of ferroelectric liquid crystals formed by banana-shaped molecules.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Electro-optical and dielectric properties of ferroelectric liquid crystals formed by banana-shaped molecules./
作者:	Huang, Yuan Ming.
面頁冊數:	174 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2465.
Contained By:	Dissertation Abstracts International65-05B.
標題:	Physics, Molecular. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3133675
ISBN:	049680913X

Electro-optical and dielectric properties of ferroelectric liquid crystals formed by banana-shaped molecules.
Huang, Yuan Ming.

Electro-optical and dielectric properties of ferroelectric liquid crystals formed by banana-shaped molecules. - 174 p.

Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2465.

Thesis (Ph.D.)--Kent State University, 2004.

Using polarizing microscope, differential scanning calorimetry, X-ray diffraction and dielectric spectroscopy, we have characterized the electro-optical and dielectric properties of achiral swollen banana-shaped materials, chiral banana-shaped liquid crystals and photoactive achiral banana-shaped liquid crystals, respectively. By dissolving non-polar solvents (xylene and hexadecane) into a banana-shaped ferroelectric liquid crystal, we have lowered the isotropic-mesophase transition temperature from 125°C to 70°C and widened the switching temperature range from &sim;2°C to &sim;50°C (i.e., room temperature switching). Then we have investigated the electro-optical and dielectric properties of four chiral banana-shaped molecules that contain chiral centers. Compared to their achiral counterparts, these chiral banana-shaped ferroelectric liquid crystals have exhibited quite different electro-optical and dielectric properties such as linear temperature dependence of the polarization. Finally, we have studied the effect of photo-irradiation on the electro-optical properties of banana-shaped FLC with built-in azo-linkage. Our results show that both the polarization and the structures of polarization current curves have been modified upon photo-irradiation. We have discussed the mechanisms that are responsible for the changes in the electro-optical properties of these ferroelectric liquid crystals; more specifically we have interpreted the linear temperature dependence of polarization in the light of Landau-de Gennes theory.

ISBN: 049680913XSubjects--Topical Terms:

1018648
Physics, Molecular.

Electro-optical and dielectric properties of ferroelectric liquid crystals formed by banana-shaped molecules.
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245 1 0 $a Electro-optical and dielectric properties of ferroelectric liquid crystals formed by banana-shaped molecules.
300 $a 174 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2465.
500 $a Director: Antal Jakli.
502 $a Thesis (Ph.D.)--Kent State University, 2004.
520 $a Using polarizing microscope, differential scanning calorimetry, X-ray diffraction and dielectric spectroscopy, we have characterized the electro-optical and dielectric properties of achiral swollen banana-shaped materials, chiral banana-shaped liquid crystals and photoactive achiral banana-shaped liquid crystals, respectively. By dissolving non-polar solvents (xylene and hexadecane) into a banana-shaped ferroelectric liquid crystal, we have lowered the isotropic-mesophase transition temperature from 125°C to 70°C and widened the switching temperature range from &sim;2°C to &sim;50°C (i.e., room temperature switching). Then we have investigated the electro-optical and dielectric properties of four chiral banana-shaped molecules that contain chiral centers. Compared to their achiral counterparts, these chiral banana-shaped ferroelectric liquid crystals have exhibited quite different electro-optical and dielectric properties such as linear temperature dependence of the polarization. Finally, we have studied the effect of photo-irradiation on the electro-optical properties of banana-shaped FLC with built-in azo-linkage. Our results show that both the polarization and the structures of polarization current curves have been modified upon photo-irradiation. We have discussed the mechanisms that are responsible for the changes in the electro-optical properties of these ferroelectric liquid crystals; more specifically we have interpreted the linear temperature dependence of polarization in the light of Landau-de Gennes theory.
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