4.8 Article

Resistive Pulse Delivery of Single Nanoparticles to Electrochemical Interfaces

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 19, Pages 3920-3924

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b01873

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Funding

  1. Air Force Office of Scientific Research MURI [FA9550-14-1-0003]
  2. College of Engineering, Health Sciences Center
  3. Office of the Vice President for Research
  4. Utah Science Technology and Research (USTAR) initiative of the State of Utah

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An experimental system for controlling and interrogating the collisions of individual nanoparticles at electrode/electrolyte interfaces is described. A nanopipet positioned over a 400 nm radius Pt ultramicroelectrode is used to deliver individual nanoparticles, via pressure-driven solution flow, to the underlying electrode, where the nanoparticles undergo collisions and are detected electrochemically. High-velocity collisions result in elastic collisions of negatively charged polystyrene nanospheres at the Pt/water interface, while low-velocity collisions result in nanoparticle adsorption (sticky collisions). The ability to position the nanopipet with respect to the underlying ultramicroelectrode also allows the time between particle release from the nanopipet and electrode collision to be investigated as a function of nanopipet-electrode separation, d. The time between release and collision of the nanoparticle is found to be proportional to d(3), in excellent agreement with an analytical expression for convective fluid flow from a pipet orifice.

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