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1. Magnetometry of single ferromagnetic nanoparticles using magneto-optical indicator films with spatial amplification
Andrew Lee Balk, Carlos M. Hangarter, Samuel M Stavis, John NMN Unguris
We present a magneto-optical imaging technique to rapidly measure two dimensional, sub-micrometer maps of fringe fields from single magnetic nanorods with microtesla sensitivity. Our technique implements an ultrathin, low-coercivity, perpendicularly ...
2. Kilohertz Rotation of Nanorods Propelled by Ultrasound, Traced by Microvortex Advection of Nanoparticles
Andrew Lee Balk, Lamar O. Mair, Pramod Pappachan Mathai, Paul N. Patrone, Wei Wang, Suzanne Ahmed, Thomas Mallouk, James Alexander Liddle, Samuel M Stavis
We measure the microvortical flows around gold nanorods propelled by ultrasound in water using polystyrene nanoparticles as optical tracers. We infer the rotational frequencies of such nanomotors assuming a hydrodynamic model of this interaction. In ...
3. High-speed, high-purity separation of gold nanoparticle‹DNA origami constructs using centrifugation
Seung H. Ko, Luis Fernando Vargas Lara, Paul N. Patrone, Samuel M Stavis, Francis Starr, Jack F Douglas, James Alexander Liddle
DNA origami is a powerful platform for assembling gold nanoparticle constructs, an important class of nanostructure with numerous applications. Such constructs are assembled by the association of complementary DNA oligomers. These association reactio ...
4. Nanofluidic Entropophoresis
Samuel M Stavis, Elizabeth A Strychalski
5. A localized transition in the size variation of circular DNA in nanofluidic slitlike confinement
Elizabeth A Strychalski, Samuel M Stavis, Jon C Geist
We report strong evidence for a localized transition in the size variation of circular DNA between
strong and moderate regimes of slitlike confinement. A novel and rigorous statistical analysis was
applied to our recent experimental measurements ...
6. Measurement Uncertainties in MEMS Kinematics by Super-Resolution Fluorescence Microscopy
Craig Dyer McGray, Samuel M Stavis, Jon C Geist
7. MEMS Kinematics by Super-Resolution Fluorescence Microscopy
Craig Dyer McGray, Samuel M Stavis, Joshua Giltinan, Eric Eastman, Samara L. Firebaugh, Jenelle Piepmeier, Jon C Geist, Michael Gaitan
Super-resolution fluorescence microscopy is used for the first time to study the nanoscale kinematics of a MEMS device in motion across a surface. A device under test is labeled with fluorescent nanoparticles that form a microscale constellation of n ...
8. A Glowing Future for Lab on a Chip Testing Standards
Samuel M Stavis
Testing standards are more fundamental from a metrological perspective and less controversial from an industrial perspective than product standards, representing a path of less resistance towards the standardization and commercialization of lab on a ...
9. Quantitative Measurements of the Size Scaling of Linear and Circular
DNA in Nanofluidic Slitlike Confinement
Elizabeth A Strychalski, Jon C Geist, Michael Gaitan, Laurie E Locascio, Samuel M Stavis
Quantitative size measurements of single linear and circular DNA molecules in nanofluidic slitlike confinement are reported. A novel experimental method using DNA entropophoresis down a nanofluidic staircase implemented comprehensive variation of sl ...
10. DNA Molecules Descending a Nanofluidic Staircase by Entropophoresis
Samuel M Stavis, Jon C Geist, Michael Gaitan, Laurie E Locascio, Elizabeth A Strychalski
A complex entropy gradient for confined DNA molecules was engineered for the first time. Following the second law of thermodynamics, this enabled the directed self-transport and self-concentration of DNA molecules. This new nanofluidic method is term ...