Gyroid Single Crystals

陀螺仪单晶

基本信息

批准号：
11450369
负责人：
HASEGAWA Hirokazu
金额：
$ 8.26万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Gyroid is a kind of thermodynamically stable bicontinuous microdomain structures observed for microphase-separated structures of block copolymer systems. Gyroid structure of block copolymers is characterized by the Gyroid minimal surface given by differential geometry and forms a complex and highly regular quasi-crystalline lattice. Bulk samples are usually consisting of many grains that are the regions where the microdomain structure has a. single orientation, and it is the case also for Gyroid. However, if we can have a single-grain Gyroid or a Gyroid single crystal, it would be very useful for the application as a functional material. In this research work, we aimed to produce large Gyroid single crystals by utilizing the self-organization process of block copolymer/homopolymer blends, and succeeded to clarify the following resultsIn the casting processes of polystyrene-block-polyisoprene diblock copolymer/ homopolystyrene blends from solution, the self-organizing processes of Gyroi … More d grains are divided into two cases : (i) sponge, an irregular network structure, transforms into Gyroid, and (ii) HPL(hexagonally perforated layer) transforms into Gyroid. In the former case, sponge is formed first from the disordered phase, and the morphological transition involves expelling of excess homopolystyrene from Gyroid phase because sponge contains more homopolymer than Gyroid. Since the nucleation of Gyroid structure occurs in many places, coagulation and reorganization of Gyroid grains take place during the Gyroid growth. The homopolymer and sponge structures sandwiched between coagulated Gyroid grains tend to be kept inside the Gyroid grains as the lattice defects. In the latter case, sponge is formed first from the disordered phase as well. However, it transforms into HPL immediately and then the HPL transforms into Gyroid. In such a case, the number density of Gyroid grains is very small and coagulation of Gyroid grains would not occur. Therefore, Gyroid single crystals with few lattice defects are formed Less

能力是一种热力学稳定的双连续的微域结构，观察到了块共聚物系统的显微合体分离结构。块共聚物的辅助结构的特征在于甲状腺最小表面由差分几何形状给出，并形成一个复杂且高度规则的准晶体晶格。批量样品通常由许多晶粒组成，这些晶粒是微域结构具有a的区域。单一方向，能力也是如此。但是，如果我们可以拥有单颗粒能力或能状单晶，则对于作为功能材料的应用非常有用。 In this research work, we aimed to produce large Gyroid single crystals by utilizing the self-organization process of block copolymer/homopolymer blends, and succeeded to clarify the following resultsIn the casting processes of polystyrene-block-polyisoprene diblock copolymer/homopolystyrene blends from solution, the self-organizing processes of Gyroi … More d grains are divided into two cases: (i)赞助商是一种不规则的网络结构，转化为能力，（ii）HPL（六角形穿孔层）转化为能力。在前一种情况下，赞助商首先是由无序阶段形成的，形态学转变涉及从甲状腺阶段排出过多的同卵球菌，因为赞助商含有的均聚物比甲状腺多。由于辅助结构的成核发生在许多地方，因此在能型生长期间发生辅助晶粒的凝结和重组。作为晶格缺陷，夹着凝结的甲状性颗粒之间的均聚物和赞助的结构往往将其保存在甲状腺晶粒内。在后来的情况下，赞助商也首先是从无序阶段形成的。但是，它立即转化为HPL，然后HPL转化为能力。在这种情况下，能晶的数量密度很小，辅助晶粒的凝结不会发生。因此，形成很少的晶格缺陷的能型单晶较少