DNA-Directed Non-Langmuir Deposition of Programmable Atom Equivalents

Langmuir : the ACS Journal of Surfaces and Colloids
Diana J LewisRobert J Macfarlane

Abstract

Particle assembly at interfaces via programmed DNA interactions allows for independent modification of both nanoparticle-surface interaction strength and the magnitude of interparticle repulsion. Together, these factors allow for modification of the deposited thin film morphology via alterations in DNA binding sequence. Importantly, both Langmuir and random sequential adsorption models yield insights into the thermodynamics of deposition but cannot fully explain particle coverage as a function of all relevant variables, indicating that the particle deposition mechanism for DNA-grafted colloids is more complex than prior adsorption phenomena. Here, it is shown that these deviations from standard behavior arise from the fact that each nanoparticle is attached to the surface via multiple weak DNA duplex interactions, enabling diffusion of adsorbed colloids across the substrate. Thus, surface migration of individual particles causes reorganization of the deposited monolayer, leading to the unusual behavior of coverage increasing at elevated temperatures that are just below the particle desorption temperature. The programmability of DNA-directed particle deposition therefore allows for precise control over the morphology of monolaye...Continue Reading

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Citations

Aug 2, 2019·Reports on Progress in Physics·Bortolo Matteo MognettiLorenzo Di Michele
Mar 24, 2020·Nature Materials·Diana J LewisRobert J Macfarlane
Jul 27, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Kathryn N GuyeDavid S Ginger
Jul 4, 2019·ACS Nano·Paul A Gabrys, Robert J Macfarlane
Aug 14, 2020·Bioconjugate Chemistry·Isaac W MoranDavid J D Carter

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