2006 Fiscal Year Final Research Report Summary
Study on flow and structure change on drawing and drying process for production of functional thin film
| Project/Area Number |
17560139
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Nagaoka University of technology |
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Principal Investigator |
TAKAHASHI Tsutomu Nagaoka University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20216732)
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| Project Period (FY) |
2005 – 2006
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| Keywords | chromonic liquid crystal dye / drawing process / drying process / functional thin film / optical anisotropy / microscopic observation |
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| Research Abstract |
In this study, the thin film formation process by application and drying of chromonic liquid crystal solution was investigated. The thin film of chromonic liquid crystal solution which is oriented by shear deformation on a glass plate has optical anisotropy. Using this process, dichroic or birefringence films and solar battery panels would be produced easier than their current processes, and manufacturing cost would be reduced. The coating device which holds a flat glass plate and slides it with a constant velocity was made for this investigation. An applicator is set up the glass plate with thin gap which is 1 to 10 □m. The predetermined amount of the sample liquid is added dropwise on the glass plate, and it is painted with the applicator. The painted thin liquid film on the glass becomes thin film by natural seasoning. The process of drying is observed by polarized microscope and the decreasing thickness of the liquid film is measured by laser displacement sensor. The optical anisotropy, such as dichroism and birefringence, of the thin film is measured by polarimetry technique. In the liquid film drying, the reduction velocity of the film thickness is not constant and vibrates with a constant frequency. It is related to occurrence of the micro flow motion of the liquid by drying which was observed in this study. The thin film exhibits strong dichroism but it includes the band-texture which reduces the quality of the optical film. At all experimental conditions, the band-texture was generated. The coating speed and the gap of the applicator did not influence the quality of the thin film
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