Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel
Liquid crystal physical gels were (thermally) prepared with cholesteryl stearate as a gelator in nematic liquid crystal, 4-cyano-4′-pentylbiphenyl. The electro-optical performance of liquid crystal physical gels is almost entirely dependent on the gels' inherent morphology. This study involved...
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Elsevier B. V.
2016
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| author | Leaw, Wai Loon Mamat, Che Rozid Triwahyono, Sugeng Abdul Jalil, Aishah Bidin, Noriah |
| author_facet | Leaw, Wai Loon Mamat, Che Rozid Triwahyono, Sugeng Abdul Jalil, Aishah Bidin, Noriah |
| author_sort | Leaw, Wai Loon |
| collection | ePrints |
| description | Liquid crystal physical gels were (thermally) prepared with cholesteryl stearate as a gelator in nematic liquid crystal, 4-cyano-4′-pentylbiphenyl. The electro-optical performance of liquid crystal physical gels is almost entirely dependent on the gels' inherent morphology. This study involved an empirical investigation of the relationships among all of the gelation temperature, morphology, and electro-optical properties. Besides continuous cooling at room temperature, isothermal cooling was also performed at both 18 and 0 °C, corresponding to near-solid and solid phases of 4-cyano-4′-pentylbiphenyl respectively. Nevertheless, the liquid crystal physical gel was also isothermally rapidly cooled using liquid nitrogen. Polarizing optical microscopy showed that the gel structure became thinner when isothermal cooling was carried out. These thinner gel aggregates then interconnected to form larger liquid crystal domains. Moreover, it was also revealed that the gel networks were randomized. Electron spin resonance results showed that the liquid crystal director orientation was severely randomized in the presence of gel networks. Conversely, isothermal cooling using liquid nitrogen generated a higher liquid crystal director orientation order. The 6.0 wt% cholesteryl stearate/4-cyano-4′-pentylbiphenyl physical gel that was isothermally cooled using liquid nitrogen showed the lowest response time in a twisted nematic mode optical cell. |
| first_indexed | 2024-03-05T20:00:04Z |
| format | Article |
| id | utm.eprints-69307 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T20:00:04Z |
| publishDate | 2016 |
| publisher | Elsevier B. V. |
| record_format | dspace |
| spelling | utm.eprints-693072017-11-22T00:45:12Z http://eprints.utm.my/69307/ Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel Leaw, Wai Loon Mamat, Che Rozid Triwahyono, Sugeng Abdul Jalil, Aishah Bidin, Noriah QD Chemistry Liquid crystal physical gels were (thermally) prepared with cholesteryl stearate as a gelator in nematic liquid crystal, 4-cyano-4′-pentylbiphenyl. The electro-optical performance of liquid crystal physical gels is almost entirely dependent on the gels' inherent morphology. This study involved an empirical investigation of the relationships among all of the gelation temperature, morphology, and electro-optical properties. Besides continuous cooling at room temperature, isothermal cooling was also performed at both 18 and 0 °C, corresponding to near-solid and solid phases of 4-cyano-4′-pentylbiphenyl respectively. Nevertheless, the liquid crystal physical gel was also isothermally rapidly cooled using liquid nitrogen. Polarizing optical microscopy showed that the gel structure became thinner when isothermal cooling was carried out. These thinner gel aggregates then interconnected to form larger liquid crystal domains. Moreover, it was also revealed that the gel networks were randomized. Electron spin resonance results showed that the liquid crystal director orientation was severely randomized in the presence of gel networks. Conversely, isothermal cooling using liquid nitrogen generated a higher liquid crystal director orientation order. The 6.0 wt% cholesteryl stearate/4-cyano-4′-pentylbiphenyl physical gel that was isothermally cooled using liquid nitrogen showed the lowest response time in a twisted nematic mode optical cell. Elsevier B. V. 2016 Article PeerReviewed Leaw, Wai Loon and Mamat, Che Rozid and Triwahyono, Sugeng and Abdul Jalil, Aishah and Bidin, Noriah (2016) Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel. Materials Chemistry and Physics, 184 . pp. 197-202. ISSN 0254-0584 http://dx.doi.org/10.1016/j.matchemphys.2016.09.042 DOI:10.1016/j.matchemphys.2016.09.042 |
| spellingShingle | QD Chemistry Leaw, Wai Loon Mamat, Che Rozid Triwahyono, Sugeng Abdul Jalil, Aishah Bidin, Noriah Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel |
| title | Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel |
| title_full | Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel |
| title_fullStr | Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel |
| title_full_unstemmed | Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel |
| title_short | Effect of temperature on the morphology and electro-optical properties of liquid crystal physical gel |
| title_sort | effect of temperature on the morphology and electro optical properties of liquid crystal physical gel |
| topic | QD Chemistry |
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