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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
Published on: May 9, 2014
Layer-by-layer assembly of thick, Cu(2+)-chelating films
Salinda Wijeratne1, Merlin L Bruening, Gregory L Baker
1Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 19, 2013
Summary
Layer-by-layer adsorption of poly(allylamine) (PAH) and poly(N,N-dicarboxymethylallylamine) (PDCMAA) creates films that effectively bind copper ions. These films demonstrate potential for metal ion scavenging and catalysis applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Environmental Engineering
Background:
- Layer-by-layer (LbL) adsorption is a technique for fabricating multilayered polymer films.
- Polymer films with specific functional groups can be designed for selective ion binding.
- Iminodiacetic acid (IDA) ligands are known for their ability to chelate metal ions.
Purpose of the Study:
- To investigate the fabrication of thick PAH/PDCMAA films using LbL adsorption.
- To quantify the metal ion binding capacity and kinetics of these films.
- To explore the potential applications of these functionalized films.
Main Methods:
- Fabrication of PAH/PDCMAA films via LbL adsorption at varying pH.
- Characterization of film thickness and morphology.
- Copper ion (Cu(2+)) binding capacity and kinetic studies using UV-Vis spectroscopy and sorption isotherms.
- Evaluation of film performance over multiple absorption/elution cycles.
Main Results:
- PAH/PDCMAA films deposited at pH 3.0 achieved significant thickness (~200 nm) and high Cu(2+) binding capacity (~2.5 mmol/cm(3)).
- Film thickness influenced Cu(2+) diffusion kinetics, with equilibration requiring ~4 hours in micrometer-thick films.
- Cu(2+) binding was found to be endothermic with positive entropy, indicating favorable complexation.
- Films maintained binding capacity over four cycles, showing stability.
Conclusions:
- LbL assembly of PAH/PDCMAA offers a route to create robust films with high metal ion binding capabilities.
- The film properties, including thickness and IDA ligand density, can be tuned by adjusting deposition pH.
- These functionalized polymer films show promise for applications in metal ion scavenging, catalysis, and protein binding.
