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Instantaneous Mechanical Programming of Polymer Microparticle Shape and Surface Architecture
Summary
Scientists developed a fast, simple method to reshape tiny plastic particles, turning them from spheres into cylinders with custom textured surfaces in just 10 seconds, using pressure instead of heat or chemicals. This is a materials science and manufacturing advance, not a health study, but understanding how plastic particle shape and surface texture can be controlled matters for microplastics research, since a particle's shape and surface features can affect how it interacts with cells and tissues in the body.
Structurally anisotropic polymer microparticles with controlled surface topographies are essential for applications in selfassembly, interfacial engineering, and responsive materials. However, practical methods for fabricating such complex morphologies remain limited. Here, we demonstrate an instantaneous mechanically driven strategy for simultaneously programming particle shape and surface architecture through a refined rubbing process. By optimizing particle plasticization, pressure distribution, and stress transmission, spherical polymer particles were transformed into cylindrical particles within only 10 s. Patterned silicon substrates enabled direct mechanical transfer of periodic surface structures, while variations in substrate topology and deformation pathway produced diverse anisotropic architectures. This simple mechanically driven process provides a straightforward platform for programming hierarchical polymer microparticle architectures.