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Shape anisotropic colloidal particle fabrication using 2-photon polymerization.
Yug C Saraswat1, Fatma Ibis1, Laura Rossi2
1Process & Energy Laboratory, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, the Netherlands.
Journal of Colloid and Interface Science
|January 6, 2020
Summary
Two-photon polymerization enables precise fabrication of anisotropic colloidal particles. Increasing particle anisotropy alters diffusion coefficients due to hydrodynamic coupling, expanding colloidal building block synthesis.
Area of Science:
- Materials Science
- Colloid Science
- Nanotechnology
Background:
- Colloid geometry dictates self-assembly properties.
- Current synthesis methods (wet chemistry, lithography) have limitations in geometry control, yield, or scalability.
- Two-photon polymerization (2PP) offers high-resolution fabrication of complex micro/nano structures.
Purpose of the Study:
- To demonstrate the fabrication of precisely designed anisotropic colloids using 2PP.
- To investigate the relationship between colloid geometry and Brownian motion.
- To optimize 2PP process parameters for colloid manufacturing.
Main Methods:
- Manufacturing of anisotropic colloids (1-10 µm) via 2PP.
- Optimization of 2PP process parameters for different dimensions.
- Analysis of shape-dependent Brownian motion using video microscopy.
- Estimation of diffusion coefficients.
Main Results:
- Successfully fabricated colloids with tailored geometries using 2PP.
- Observed deviations in diffusion coefficients from analytical predictions for anisotropic particles.
- Attributed deviations to increased hydrodynamic coupling with higher anisotropy.
Conclusions:
- 2PP is a viable method for producing anisotropic colloidal building blocks with controlled geometry.
- Geometric anisotropy significantly impacts particle diffusion.
- This technique democratizes the synthesis of custom colloidal particles.
