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Engineering Cylindrical Polymer Particles: Mechanisms and Fabrication under Mechanical Stress.
Kota Takemura1, Jiwoo Min1, Nozomu Suzuki1
1Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 13, 2026
Summary
Researchers developed a new method to create cylindrical polymer particles by stirring spherical ones. Particle shape transformation is driven by mechanical stress between vial and stirring bar materials.
Area of Science:
- Polymer Science
- Materials Science
- Nanotechnology
Background:
- Previous work established a stirring method for fabricating cylindrical polymer particles.
- Spherical polymer particles were stirred in an aqueous solution to achieve cylindrical shapes.
Purpose of the Study:
- To elucidate the formation mechanism of cylindrical polymer particles from spherical precursors.
- To investigate the influence of material properties (Young's modulus) of vials and stirring bars on particle deformation.
- To develop alternative fabrication methods for cylindrical polymer particles.
Main Methods:
- Spherical polystyrene (PS) particles were stirred in a poly(vinylpyrrolidone) aqueous solution.
- Combinations of vial and stirring bar materials (PTFE and glass) with varying Young's moduli were employed.
- A rubbing process using two plates was developed as an alternative fabrication method.
Main Results:
- Cylindrical PS particles were successfully obtained when using a glass vial with a PTFE stirring bar or a PTFE vial with a glass stirring bar.
- Deformation of PS particles was attributed to direct mechanical stress between the vial and stirring bar, not fluid shear stress.
- The rubbing process provided another route for fabricating cylindrical polymer particles.
Conclusions:
- The mechanical properties of interacting surfaces significantly influence the transformation of spherical to cylindrical polymer particles.
- Direct mechanical stress is the primary driver for shape deformation in the stirring method.
- New methods for controlled synthesis of anisotropic polymer particles were established.
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