Shape anisotropic colloidal particle fabrication using 2-photon polymerization
| Autor: | Laura Rossi, Luigi Sasso, Huseyin Burak Eral, Fatma Ibis, Paola Fanzio, Yug C. Saraswat |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Video microscopy 02 engineering and technology 010402 general chemistry Multiphoton lithography 01 natural sciences Biomaterials Colloid Colloid and Surface Chemistry Colloidal particles Nano Diffusion (business) Anisotropy Particle tracking Two-photon polymerization 3D printing 021001 nanoscience & nanotechnology Aspect ratio (image) 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Shape anisotropic colloids Chemical physics Particle Two photon lithography Brownian motion 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science, 564 |
| ISSN: | 0021-9797 |
| Popis: | Hypothesis: Our ability to dictate the colloid geometry is intimately related to self-assembly. The synthesis of anisotropic colloidal particles is currently dominated by wet chemistry and lithographic techniques. The wet chemical synthesis offers limited particle geometries at bulk quantities. Lithographic techniques, on the other hand, provide precise control over the particle shape, although at lower yields. In this respect, two-photon polymerization (2PP)1 has attracted growing attention due to its ability to automatically fabricate complex micro/nano structures with high resolution. Experiments: We manufacture precisely designed colloids with sizes ranging from 1 µm to 10 µm with 2PP and optimize the process parameters for each dimension. Moreover, we study the shape dependent Brownian motion of these particles with video microscopy and estimate their diffusion coefficients. Findings: We observe that increasing the geometrical anisotropy leads to a pronounced deviation from the analytically predicted diffusion coefficient for disks with a given aspect ratio. The deviation is attributed to stronger hydrodynamic coupling with increasing anisotropy. We demonstrate, for the first time, 2PP manufacturing of colloids with tailored geometry. This study opens synthesis of colloidal building blocks to a broader audience with limited access to cleanrooms or wet-chemistry know-how. |
| Databáze: | OpenAIRE |
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