Orientation behavior of cellulose microcrystals in magnetic and electric fields and its application for new material design.

纤维素微晶在磁场和电场中的取向行为及其在新材料设计中的应用。

• 批准号: 05660180
• 负责人: SUGIYAMA Junji
• 金额: $ 1.41万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660180/
• 关键词: Cellulose; Chitin; Microcrystalline suspension; Static magnetic field; Magnetic orientation; Diamagnetic susceptibility; 静電場; 双極子モーメント; セルロース微結晶; 強磁場; 強電場; 誘電率; 分極率; キチン微結晶; 複屈折

Following results on the orientation behavior by strong static magnetic field of microcrystalline cellulose and chitin in aqueous suspensions has been produced.(1) Both cellulose and chitin microcrystals in suspensions oriented in such a way that their molecular axs were laid perpendicular to the field direction. The same orientation was observed when the suspension was dried in the field.(2) Degree of orientation was improved with increasing field strength. However, the perfect orientation could not be achieved even using the strongest field at 17.5 Tesla. In general, the microcrystals having longer length as well as uniform length distribution tended to orient better.(3) In the case of shorter microcrystals such from wood or chitin, the better orientation was observed when the suspension was dried in the field. For this, the liquid crystalline character of the corresponding suspension-so called self-ordering behavior-seemed to play an important role in addition to the effect of the magnetic field.(4) The calculation of magnetic anisotropy was in good accord with the experimental results. The result that the pyranose ring was laid perpendicular to the fields was theoretically demonstrated.The experiments using strong static electric fields, the test of new material design using the physical fields, were also planned. However, we could not investigated as thoroughly as we have done on the basic magnetic field experiments. The work along these line was left for further studies.

以下结果是在水性悬浮液中的微晶纤维素和几丁质的强静态磁场的取向的结果。当悬浮液在田间干燥时观察到相同的方向。（2）随着场强度的提高，方向提高程度。但是，即使使用17.5特斯拉的最强领域，也无法实现完美的方向。通常，具有较长长度和均匀长度分布的微晶体倾向于更好。（3）在较短的微晶（例如木材或几丁质的微晶）的情况下，当悬浮液在田间干燥时观察到更好的方向。为此，相应悬浮液的液晶特性称为自我排序行为，除了磁场的效果外，还起着重要作用。（4）磁各向异性的计算与实验相符结果。还计划了使用强静电场（使用强静电场测试使用物理场的新材料设计测试）实验的实验。但是，我们无法像在基本磁场实验上所做的那样彻底研究。沿这些线路的工作进行了进一步的研究。

项目成果

J.Sugiyama: "On the cell wall polarity in Valonia cellulose" Planta.(in press).

J.Sugiyama：“论 Valonia 纤维素中的细胞壁极性”Planta。（正在印刷中）。

Wada,M.ら: "Two crystalline phasc (Iα/Iβ) system of native celluloses in relution to Plant Phy logenesis" Mokuzai Gakkaishi. 41. 186-192 (1995)

Wada, M. 等人：“天然纤维素的两种结晶相 (Iα/Iβ) 系统与植物系统发育的关系”Mokuzai Gakkaishi，41. 186-192 (1995)。

杉山 淳司: "天然セルロースの多様性" Cellulose Communications. 1. 6-11 (1994)

Junji Sugiyama：“天然纤维素的多样性”《纤维素通讯》1. 6-11 (1994)。

Sugiyama, J.et al.: "Orientation of cellulose microcrystals by strong magnetic field." Macromolecules. 25. 4232-4234 (1992)

Sugiyama, J.et al.：“强磁场对纤维素微晶的取向”。

Sugiyama, J.et al.: "Diamagnetic anisotropy of crystalline cellulose" Macromolecules. (in preparation).

Sugiyama, J.et al.：“结晶纤维素的抗磁各向异性”大分子。