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Fabrication of Anisotropic Polymeric Artificial Antigen Presenting Cells for CD8+ T Cell Activation
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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
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
3D printingBrownian motionColloidal particlesParticle trackingShape anisotropic colloidsTwo photon lithographyTwo-photon polymerization

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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.