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Nanoparticle Assembly in High Polymer Concentration Solutions Increases Superlattice Stability.
Margaret S Lee1, Alfredo Alexander-Katz1, Robert J Macfarlane1
1Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|July 28, 2021
Summary
Adding free polymer chains to nanoparticle superlattices significantly enhances their thermal stability. This simple method allows for better control over nanocomposite processing without disrupting particle organization.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Polymer nanocomposites combine nanoscale fillers with polymer matrices, offering enhanced properties.
- Ordered particle arrays in nanocomposites can lead to emergent properties, but their formation is often limited by processing constraints.
- Current methods for creating ordered nanoparticle superlattices require weak interparticle interactions, hindering compatibility with conventional processing.
Purpose of the Study:
- To investigate a simple method for increasing the thermal stability of nanoparticle superlattices.
- To explore how free polymer chains influence the stability and organization of nanoparticle assemblies.
- To enable wider processing conditions for nanocomposites with controlled particle organization.
Main Methods:
- Synthesizing nanoparticle superlattices.
- Adding free polymer chains at high concentrations (>50 mg mL⁻¹) to the assembly solution.
- Analyzing the thermal stability and structural integrity of the superlattices using various techniques.
Main Results:
- High concentrations of free polymer chains significantly increase the thermal stability of nanoparticle superlattices against dissociation.
- The addition of free polymer does not adversely affect the ordered structure of the superlattices.
- Polymer topology, molecular weight, and concentration were identified as tunable parameters for controlling stability.
Conclusions:
- Free polymer chains offer a facile strategy to enhance the thermal stability of nanoparticle superlattices.
- This approach overcomes limitations of conventional processing, allowing for greater control over nanocomposite fabrication.
- The findings pave the way for developing advanced nanocomposites with precisely controlled particle organization.
