AI 中文总结
研究侧链长度对铁电向列相液晶介晶性质的影响，通过延长侧链制备新同系物，测定其介晶和材料性质，确认NF相铁电性，比较相关参数并讨论因额外N相产生的新效应。
AI 中文摘要
铁电向列相的发现为软物质化学与物理领域开辟了新方向。本文基于分子结构，对先前报道的以二甲基氨基封端的铁电向列相液晶进行改性。通过延长侧链制备了两种新同系物，研究其长度对介晶性质的影响。先前报道的同系物呈现从各向同性相（Iso）到铁电向列相（NF）的直接相变，而延长烷基链后中间出现窄向列相（N）。测定了新化合物的介晶和材料性质，通过极化、SHG信号和介电常数确认了NF相的铁电性。最后比较了这些参数与侧链长度的关系，并讨论了因额外N相而产生的新效应。
英文摘要
The discovery of ferroelectric nematic phase opened new directions in the field of soft matter chemistry and physics. In this paper, we have modified a previously reported ferroelectric nematogen based on molecular structure with dimethylamino-terminated part. We have prepared two new homologues by prolonging a side chain and investigated the effect of its length on the mesomorphic properties. While previously reported homologues exhibited a direct phase transition from the isotropic (Iso) to the ferroelectric nematic phase (NF), for prolonged alkyl chain there is a narrow nematic phase (N) in between. For new compounds, we have established their mesomorphic and material properties. We have confirmed ferroelectricity of the NF phase by the polarization, SHG signal and permittivity. Finally, we have compared these parameters with respect to the side-chain length and discussed new effects, discovered for prolonged homologues due to the presence of an additional N phase.
Comments21 pages, 9 figures
