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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。

基本信息

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

项目摘要

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.

本文研究了微晶纤维素和甲壳素在强磁场作用下的取向行为。(1)悬浮液中的纤维素和甲壳素微晶都以这样的方式取向，即它们的分子轴垂直于场方向。当悬浮液在现场干燥时，观察到相同的取向。(2)取向度随电场强度的增加而提高。然而，即使使用17.5特斯拉的最强场也无法实现完美的定向。一般而言，具有较长长度以及均匀长度分布的微晶倾向于更好地取向。(3)在较短的微晶，如木材或甲壳素的情况下，更好的取向时，观察到悬浮液在现场干燥。对于这一点，相应的悬浮液的液晶特性-所谓的自排序行为-似乎发挥了重要作用，除了磁场的影响。(4)磁各向异性的计算结果与实验结果雅阁较好。从理论上证明了吡喃糖环垂直于电场放置的结果，并计划进行使用强静电场的实验，以及使用物理场的新材料设计测试。然而，我们无法像在基本磁场实验中所做的那样彻底地研究。沿着这些路线的工作沿着留待进一步研究。