†Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
‡Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
Nano Lett. 2015 May 13;15(5):3420-4. doi: 10.1021/acs.nanolett.5b00760. Epub 2015 Apr 21.
We report the first in situ measurement of the helical pitch of the helical nanofilament B4 phase of bent-core liquid crystals using linearly polarized, resonant soft X-ray scattering at the carbon K-edge. A strong, anisotropic scattering peak corresponding to the half-pitch of the twisted smectic layer structure was observed. The equilibrium helical half-pitch of NOBOW is found to be 120 nm, essentially independent of temperature. However, the helical pitch can be tuned by mixing guest organic molecules with the bent-core host, followed by thermal annealing.
我们首次使用共振软 X 射线散射在碳 K 边对扭曲的近晶 B4 相的螺旋纳米丝的螺旋螺距进行了原位测量。观察到对应于扭曲的层状结构的半螺距的强烈各向异性散射峰。NOBOW 的平衡螺旋半螺距为 120nm，基本与温度无关。然而，通过与弯曲中心主体混合客体有机分子并随后进行热退火，可以调节螺旋螺距。
