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Assemble-and-stretch method for creating two- and three-dimensional structures of anisotropic particles
1Department of Chemical Engineering and Center for Molecular and Engineering Thermodynamics, University of Delaware, 150 Academy Street, Newark, Delaware 19716, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 4, 2009
Summary
Researchers created ordered arrays of anisotropic particles in 2D and 3D structures using strained polymer films. This method allows precise control over particle orientation for photonic applications and fundamental packing studies.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Fabrication of ordered particle arrays is crucial for advanced materials.
- Controlling particle anisotropy and orientation is challenging.
- Existing methods lack precise control over multi-layered structures.
Purpose of the Study:
- To develop a novel method for fabricating 2D and 3D ordered arrays of anisotropic particles.
- To demonstrate independent control over particle orientation in each layer.
- To explore applications in photonics and fundamental particle packing studies.
Main Methods:
- Embedding hexagonally close-packed monolayers of spherical latex particles in polymer films.
- Subjecting the polymer films to controlled extensional strain.
- Stacking multiple strained films to create three-dimensional structures.
Main Results:
- Successfully fabricated 2D ordered arrays of anisotropic particles.
- Created 3D structures with independently controllable particle orientation per layer.
- Demonstrated control over layer symmetry based on initial particle arrangement and strain direction.
Conclusions:
- The developed technique offers a versatile approach for creating complex particle assemblies.
- This method facilitates the design of materials for photonic devices.
- It provides a platform for investigating the fundamental physics of anisotropic particle packing.
