Strachan Grant J, Górecka Ewa, Szydłowska Jadwiga, Makal Anna, Pociecha Damian
Faculty of Chemistry, University of Warsaw, Zwirki i Wigury 101, Warsaw, 02-089, Poland.
Adv Sci (Weinh). 2025 Jan;12(3):e2409754. doi: 10.1002/advs.202409754. Epub 2024 Nov 25.
A material showing a sequence of three ferroelectric liquid crystalline phases below the paraelectric nematic phase is synthesized and studied. The polar order of molecules appearing due to the dipole-dipole interactions in the ferroelectric nematic, N, phase is preserved also in the smectic phases: orthogonal SmA and tilted SmC. The ferroelectric ground state of both smectic phases is confirmed by their second harmonic generation (SHG) activity and polarization switching. In the SmC phase the polarization becomes oriented to the electric field by decreasing the tilt angle to zero. Although both smectic phases are ferroelectric in nature, their dielectric response is found to be very different.
合成并研究了一种在顺电向列相以下呈现三个铁电液晶相序列的材料。由于铁电向列相（N相）中偶极 - 偶极相互作用而出现的分子极性有序在近晶相中也得以保留：正交近晶A相（SmA）和倾斜近晶C相（SmC）。两个近晶相的铁电基态通过其二阶谐波产生（SHG）活性和极化切换得到证实。在SmC相中，通过将倾斜角减小到零，极化方向与电场取向一致。尽管两个近晶相本质上都是铁电的，但发现它们的介电响应非常不同。
