2 research outputs found
Solution Phase Gold Nanorings on a Viral Protein Template
Current studies on materials that exhibit metamaterial
properties are mainly focused on lithography-generated 2D substrates.
Here we report the successful fabrication of 22 nm gold nanoparticle
rings with and without a central nanoparticle assembled on Tobacco
Mosaic Virus coat protein disks. These structures are one of the first
examples of nanorings produced independently of a substrate and represent
the first steps toward the realization of a solution-phase or coatings-based
metamaterial
Iron Oxide Surface Chemistry: Effect of Chemical Structure on Binding in Benzoic Acid and Catechol Derivatives
The excellent performance
of functionalized iron oxide nanoparticles
(IONPs) in nanomaterial and biomedical applications often relies on
achieving the attachment of ligands to the iron oxide surface both
in sufficient number and with proper orientation. Toward this end,
we determine relationships between the ligand chemical structure and
surface binding on magnetic IONPs for a series of related benzoic
acid and catechol derivatives. Ligand exchange was used to introduce
the model ligands, and the resultant nanoparticles were characterized
using Fourier transform infrared–attenuated internal reflectance
spectroscopy, transmission electron microscopy, and nanoparticle solubility
behavior. An in-depth analysis of ligand electronic effects and reaction
conditions reveals that the nature of ligand binding does not solely
depend on the presence of functional groups known to bind to IONPs.
The structure of the resultant ligand–surface complex was primarily
influenced by the relative positioning of hydroxyl and carboxylic
acid groups within the ligand and whether or not HClÂ(aq) was added
to the ligand-exchange reaction. Overall, this study will help guide
future ligand-design and ligand-exchange strategies toward realizing
truly custom-built IONPs