高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

纺锤形二氧化硅胶体粒子的制备及组装

陈广东1#, 暴崧旭2#, 聂志鸿3, 刘堃2, 杨扬2   

  1. 1.吉林建筑大学材料科学与工程学院

    2.吉林大学化学学院, 超分子结构与材料全国重点实验室 3.复旦大学高分子科学系, 聚合物分子工程全国重点实验室

  • 收稿日期:2025-11-05 修回日期:2025-11-23 网络首发:2025-12-08 发布日期:2025-12-08
  • 通讯作者: 陈广东 E-mail:chenguangdong@jlju.edu.cn
  • 基金资助:
    国家自然科学基金（项目编号：22472065, 22122203, 52073114）和吉林省教育厅科学技术研究项目（项目编号：JJKH20250976KJ）资助

Synthesis and Assembly of Spindle-Shaped Silica Colloidal Particles

CHEN Guangdong1#, *, BAO Songxu2#, NIE Zhihong3, *, LIU Kun2, *, YANG Yang2, *   

  1. 1. School of Materials Science and Engineering, Jilin Jianzhu University

    2. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University 3. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University

  • Received:2025-11-05 Revised:2025-11-23 Online First:2025-12-08 Published:2025-12-08
  • Supported by:
    Supported by the National Natural Science Foundation of China (No. 22472065, 22122203, 52073114) and Science and Technology Research Project of the Education Department of Jilin Province (No. JJKH20250976KJ)

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摘要： 采用分段控温微乳液法制备了具有不同形状参数和尺寸的各向异性纺锤形二氧化硅胶体粒子(SSCPs). 扫描电子显微镜表征结果表明, SSCPs具有中间粗、两端细的纺锤形状, 并且尺寸形貌均一. 以SSCPs为组装基元, 通过毛细管重力沉积在形状熵驱动下组装形成胶体液晶, 包括近晶相、向列相和无序相. 以SSCPs粒子的总长度(L)为横坐标、端部与中段直径比值(De/Dc)为纵坐标绘制液晶相图, 当L > 1.31 μm且De/Dc < 0.72时, SSCPs可抑制近晶相的形成, 并诱导向列相的形成.

关键词: 胶体液晶, 组装, 二氧化硅胶体粒子; 向列相, 纺锤形

Abstract: Anisotropic spindle-shaped silica colloidal particles (SSCPs) with tunable geometrical parameters and sizes were synthesized via a segmented, temperature-controlled microemulsion method. Scanning electron microscopy characterization results showed that the SSCPs possess a uniform spindle-like morphology characterized by a thicker middle segment and two thinner ends. Using these SSCPs as building blocks, colloidal liquid crystals were assembled driven by shape entropy via gravity sedimentation in capillary. The resulting structures included smectic, nematic, and isotropic phases. A phase diagram was constructed with the total length (L) of SSCPs as the horizontal axis and the end-to-center diameter ratio (De/Dc) as the vertical axis. When L > 1.31 μm and De/Dc < 0.72, the formation of the smectic phase was effectively suppressed, and the nematic phase was preferentially induced.

Key words: colloidal liquid crystal, assembly, silica colloidal particles, nematic phase; spindle-shaped

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