Synthesis and Assembly of Spindle-Shaped Silica Colloidal Particles

doi:10.7503/cjcu20250336

Chem. J. Chinese Universities

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Synthesis and Assembly of Spindle-Shaped Silica Colloidal Particles

CHEN Guangdong^1#,
*, BAO Songxu^2#, NIE Zhihong^{3, *}, LIU Kun^{2, *}, YANG Yang^{2, *}

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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Abstract

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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CHEN Guangdong, BAO Songxu, NIE Zhihong, LIU Kun, YANG Yang. Synthesis and Assembly of Spindle-Shaped Silica Colloidal Particles[J]. Chem. J. Chinese Universities, doi: 10.7503/cjcu20250336.

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Synthesis and Assembly of Spindle-Shaped Silica Colloidal Particles

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