2007 Fiscal Year Final Research Report Summary
Control of Dimensionality in Packing Structures Formed by Cubic Mesogens and Development of a New Molecular System
| Project/Area Number |
18550121
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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 |
Functional materials chemistry
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| Research Institution | Gifu University |
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Principal Investigator |
KUTSUMIZU Shoichi Gifu University, Faculty of Engineering, Associate Prof. (80214964)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Cubic Mesophase / Phase Behavior / Microstructure / X-ray Diffraction / Triply Periodic Minimal Surface / Infrared Spectra / Cubic-Cubic Phase Transition Dyniamics |
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| Research Abstract |
Our ultimate goal is to control the transition between cubic (Cub) and smectic C (SmC) mesophases by external stimuli such as electric field or UV light. The system selected in this project is 1,2-bis (4'-n-alkoxybenzoyl) hydrazines (BABHs) with various alkyl chain lengths (n, where n is the number of carbon atoms in the alkyl chain and in this investigation varies from 4 to 22). To build a new molecular system responsive to UV light, binary mixtures of the BABH with 4,4'-n-alkoxyazobenzenes (AZO) were prepared and their phase behavior and response behavior to UV light irradiation were investigated. The following results were obtained:
1. First, we investigated the microstructure of the host compounds BABHs mainly by X-ray diffraction and infrared measurements. The n-temperature diagram was surveyed and two types of Cub phases with Ia3d (n = 5-13, 15-22) and Im3m (n = 13-16) symmetries were found; at a given temperature is seen the phase sequence of Ia3d -Im3m -Ia3d on going to larger n. The members with n = 13, 15, and 16 exhibit a Cub-to-Cub phase transition when temperature is varied.
2. From the packing study for the two Ia3d-Cub phases formed by shorter and longer chain members, we conclude that the BABH system provides a broad range of self-organization process from the low molecular mass liquid crystalline regime to the micro-segregation regime, and at the borderline between the two regimes the formation of the Im3m-Cub phase is realized.
3. Finally, for a BABH-AZO mixture with an optimized composition, we successfully observed a reversible photo-switching between the Ia3d-Cub and SmC phases.
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[Presentation] Structural Analysis of Im3m Phase of BABH-n by Maximum Entropy Method2007
Author(s)
K. Ozawa, Y. Yamamura, S. Yasuzuka, K. Saito, H. Mori, and S. Kutsumizu
Organizer
YITP Workshop 2007, New Frontiers in Colloidal Physics: A Bridge between Micro-and Macroscopic Concepts in Soft Matter, Kyoto, Japan, July 25-27, 2007.
Place of Presentation
京大会館
Year and Date
2007-06-26
Description
「研究成果報告書概要(和文)」より
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