Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (2): 20250336.doi: 10.7503/cjcu20250336

• Physical Chemistry • Previous Articles     Next Articles

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,Changchun 130118,China
    2.State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun 130012,China
    3.State Key Laboratory of Molecular Engineering of Polymers,Department of Macromolecular Science,Fudan University,Shanghai 200438,China
  • Received:2025-11-05 Online:2026-02-10 Published:2025-12-08
  • Contact: CHEN Guangdong, YANG Yang E-mail:chenguangdong@jlju.edu.cn;yangchem@jlu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22472065);the Science and Technology Research Project of the Education Department of Jilin Province, China(JJKH20250976KJ)

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(SEM) characterization results showed that the SSCPs possess a uniform spindle-like morphology with 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 a 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-shape

CLC Number: 

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