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Evaporative gold nanorod assembly on chemically stripe-patterned gradient surfaces.
Imtiaz Ahmad1, H Patrick Jansen1, Jeroen van Swigchem1
1Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands.
Journal of Colloid and Interface Science
|January 17, 2015
Summary
Controlled nanoparticle deposition is achieved using patterned surfaces and receding liquid lines. This method directs nanoparticle placement and enables selective phase separation based on size and shape.
Area of Science:
- Materials Science
- Fluid Dynamics
- Surface Chemistry
Background:
- Controlling nanoparticle deposition is crucial for advanced material fabrication.
- Understanding liquid dynamics during drying is key to predictable material assembly.
Purpose of the Study:
- To investigate the use of controlled receding contact line motion for nanoparticle deposition.
- To explore how wettability gradients influence nanoparticle spatial distribution.
- To model liquid bridge formation and its effect on residue patterns.
Main Methods:
- Fabrication of stripe-patterned wettability gradients (hydrophilic/hydrophobic).
- Deposition of nanoparticle suspensions (nanorods, nanospheres) on patterned substrates.
- Observation of nanoparticle deposits after solvent evaporation.
- Modeling of liquid bridge dynamics during droplet motion.
Main Results:
- Nanoparticles preferentially deposit on hydrophilic stripes, avoiding hydrophobic regions.
- Formation of distributed nanoparticle islands indicates stick-slip receding of the contact line.
- Liquid bridges spanning multiple stripes influence drying residue patterns.
- Selective phase separation of nanoparticles within islands based on size and shape observed.
Conclusions:
- Pre-defined motion of receding contact lines effectively controls nanoparticle deposition patterns.
- Wettability gradients and liquid dynamics dictate nanoparticle spatial distribution.
- The study reveals size- and shape-selective self-assembly of nanoparticles during drying.
