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Reversible Self-Assembly of Gold Nanoparticles Based on Co-Functionalization with Zwitterionic and Cationic Binding Motifs*. | LitMetric

Reversible Self-Assembly of Gold Nanoparticles Based on Co-Functionalization with Zwitterionic and Cationic Binding Motifs*.

Chemistry

Faculty of Chemistry (Organic Chemistry) and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany.

Published: September 2021

AI Article Synopsis

  • * When the binding motifs, cationic guanidiniocarbonyl pyrrole (GCP) and zwitterionic guanidiniocarbonyl pyrrole carboxylate (GCPZ), are balanced, AuNPs can self-assemble at various pH levels but disassemble at others.
  • * The study demonstrates that temperature can also influence disassembly, allowing for a total of seven different states of assembly based on the combination of pH and temperature, providing a versatile approach for nanoparticle manipulation

Article Abstract

We report a pH- and temperature-controlled reversible self-assembly of Au-nanoparticles (AuNPs) in water, based on their surface modification with cationic guanidiniocarbonyl pyrrole (GCP) and zwitterionic guanidiniocarbonyl pyrrole carboxylate (GCPZ) binding motifs. When both binding motifs are installed in a carefully balanced ratio, the resulting functionalized AuNPs self-assemble at pH 1, pH 7 and pH 13, whereas they disassemble at pH 3 and pH 11. Further disassembly can be achieved at elevated temperatures at pH 1 and pH 13. Thus, we were able to prepare functionalized nanoparticles that can be assembled/disassembled in seven alternating regimes, simply controlled by pH and temperature.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8518125PMC
http://dx.doi.org/10.1002/chem.202102457DOI Listing

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