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Related Experiment Video

Updated: Jun 15, 2026

High-speed Particle Image Velocimetry Near Surfaces
11:59

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

Nanoparticle image velocimetry at topologically structured surfaces.

Gea O F Parikesit, Jeffrey S Guasto, Salvatore Girardo

    Biomicrofluidics
    |March 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Nanoparticle image velocimetry (nano-PIV) now measures fluid flow over structured surfaces, not just smooth ones. This breakthrough enables studying fluid dynamics near complex micro- and nano-scale topographies.

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    Last Updated: Jun 15, 2026

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    Area of Science:

    • Fluid dynamics
    • Surface science
    • Nanotechnology

    Background:

    • Nanoparticle image velocimetry (nano-PIV) is a technique for studying fluid flow near surfaces.
    • Current applications of nano-PIV are limited to smooth surfaces.
    • Understanding fluid flow over structured surfaces is crucial for microfluidics and nanotechnology.

    Purpose of the Study:

    • To extend the application of nano-PIV to topologically structured surfaces.
    • To quantify flow velocity distributions over structured surfaces.
    • To demonstrate the feasibility of studying fluid-surface interactions on complex topographies.

    Main Methods:

    • Total internal reflection fluorescent microscopy was used as the basis for nano-PIV.
    • A polydimethylsiloxane surface with a periodic grating structure (215 nm height, 2 µm period) was fabricated using multilevel lithography.
    • Evanescent-wave illumination was carefully configured to avoid disruption by surface structures.

    Main Results:

    • Nano-PIV was successfully applied to measure fluid flow over a structured surface.
    • Measured tracer displacement data closely matched computed theoretical values.
    • The study demonstrated the capability of nano-PIV to resolve flow dynamics on non-smooth surfaces.

    Conclusions:

    • Nano-PIV can be effectively applied to topologically structured surfaces.
    • This advancement opens new avenues for investigating fluid flow and surface interactions in complex microenvironments.
    • The findings have implications for designing microfluidic devices and understanding nanoscale phenomena.