2014 Fiscal Year Final Research Report
Ion Adsorption-Desorption System Using Liquid Crystalline Polysaccharides by Mechanical Stimulus
Project/Area Number |
25620139
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Green/Environmental chemistry
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Research Institution | Niigata University (2014) Yamagata University (2013) |
Principal Investigator |
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Project Period (FY) |
2013-04-01 – 2015-03-31
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Keywords | 多糖 / 粘弾性 / 液晶 / 逆チキソトロピー / ゲル化 |
Outline of Final Research Achievements |
Cyanobacterial megamolecules, sacrans are polysaccharides derived from the extracellular matrix of Aphanotece. We have investigated the effect of liquid crystal (LC) domains on the viscoelastic properties of sacran aqueous solutions. An aqueous solution of 1 wt% sacran is a weak gel which consists of polydomains of liquid crystals under without shear flow. The sacran solution demonstrated thixotropic behavior under high shear rates at approximately >1 s-1. Under high shear rates, it was revealed that the LC polydomains were destructed by the shear and changed to a structure of monodomain. Oppositely, at low shear rates, the LC polydomains were also destructed, however, the viscosity dramatically increased with an elapse of time which is called negative thixotropy. The storage modulus for sacran solutions increased just after applying the shear. It can be considered by the dynamic viscoelastic measurement that the ion adsorption occurs by the crosslinking between sacran chains.
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Free Research Field |
高分子材料の新規合成、物性
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