文献类型：期刊文献

英文题名：Defect structures and ordering behaviours of diblock copolymers self-assembling on spherical substrates

作者：Zhang, Liangshun[1];Wang, Liquan[1];Lin, Jiaping[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, State Key Lab Bioreactor Engn,Key Lab Ultrafine M, Shanghai 200237, Peoples R China

年份：2014

卷号：10

期号：35

起止页码：6713

外文期刊名：SOFT MATTER

收录：;EI(收录号：20143518096795);WOS:【SCI-EXPANDED(收录号:WOS:000341025500013)】；

基金：This work was supported by the National Natural Science Foundation of China (51203049, 21234002), and Research Fund for the Doctoral Program of Higher Education of China (20120074120003).

语种：英文

外文关键词：Lamellar structures - Baseball - Annihilation - Spheres - Defect structures

摘要：One of the main differences of ordered structures constrained on curved surfaces is the nature of topological defects. We here explore the defect structures and ordering behaviours of both lamellar and cylindrical phases of block copolymers confined on spherical substrates by the Landau-Brazovskii theory, which is numerically solved by a highly accurate spectral method with a spherical harmonic basis. For the cylindrical phase, isolated disclinations and scars are generated on the spherical substrates. The number of excess dislocations in a scar depends linearly on the sphere radius. The defect fraction characterizing the ordering dynamics decays exponentially. The scars are formed from the isolated disclinations via mini-scars. For the lamellar phase, three types of defect structures (hedgehog, spiral and quasi-baseball) are identified. The disclination annihilation is the primary ordering mechanism of the lamellar phase.