2D Spherulites of a Semi-Fluorinated Alkane: Controlled Access to Either Radial Or Ring-Banded Morphologies.
2D Spherulites of a Semi-Fluorinated Alkane: Controlled Access to Either Radial Or Ring-Banded Morphologies.
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DOI：
10.1002/cphc.201701064
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
Xianhe Liu;S. Mielke;Christophe Contal;D. Favier;Akihisa Yamamoto;Motomu Tanaka;M. Krafft
中科院分区：
文献类型：
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作者：
Xianhe Liu;S. Mielke;Christophe Contal;D. Favier;Akihisa Yamamoto;Motomu Tanaka;M. Krafft
半氟化烷烃薄膜浇铸在固体衬底上，由形状良好的二维非双折射环状和/或径向球晶组成。控制实验条件允许取向的结晶向径向或环带的形貌。在中间态中，径向球晶和环带状球晶共存。对这些中间态形成的监测为第一种结晶模式提供了证据，该模式从中心核径向向外扫描，直到传播前沿经历第二种结晶模式，该模式通过扩散控制的节奏结晶机制进行，导致高（≈2 μm）同心脊。通过光学和原子力显微镜、干涉轮廓术和非镜面中子散射对这些二维球粒进行了研究。
Thin films of a semi-fluorinated alkane cast onto solid substrates consist of well-formed two-dimensional non-birefringent ring-banded and/or radial spherulites. Controlling the experimental conditions allows orientation of the crystallization toward either radial-only or ring-banded-only morphologies. Intermediate states were also captured in which both radial and ring-banded spherulites coexist. Monitoring of the formation of these intermediate states brought evidence for a first crystallization mode that sweeps radially outwards from a central nucleus until the propagating front edge experiences a second crystallization mode that proceeds through a diffusion-controlled rhythmic crystallization mechanism that leads to high (≈2 μm) concentric ridges. These 2D spherulites were investigated by optical and atomic force microscopies, interferometric profilometry, and off-specular neutron scattering.