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You searched on: Author: Samuel Stavis

Displaying records 1 to 10 of 35 records.
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1. Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis
Published: 9/3/2015
Authors: Andrew Lee Balk, Lamar O. Mair, Feng Guo, Carlos M. Hangarter, Pramod Pappachan Mathai, Robert D McMichael, Samuel M Stavis, John Unguris
Abstract: We introduce an implementation of magnetophoresis to measure the absolute magnetization of ferromagnetic nanorods dispersed in fluids, by analyzing the velocity of single nanorods under an applied magnetic field gradient. A microfluidic guideway prev ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915308

2. Characterization of Electrothermal Actuation with Nanometer and Microradian Precision
Published: 6/21/2015
Authors: Craig Robert Copeland, Craig D. (Craig) McGray, Jon C Geist, Vladimir A Aksyuk, Samuel M Stavis
Abstract: A recently introduced particle-tracking method was used to measure the single motion cycles of an electrothermal actuator with nanometer and microradian precision. Driving the actuator with a low-noise input induced deterministic motion that was per ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918216

3. Magnetometry of single ferromagnetic nanoparticles using magneto-optical indicator films with spatial amplification
Published: 3/16/2015
Authors: Andrew Lee Balk, Carlos M. Hangarter, Samuel M Stavis, John Unguris
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917793

4. Kilohertz Rotation of Nanorods Propelled by Ultrasound, Traced by Microvortex Advection of Nanoparticles
Published: 8/26/2014
Authors: Andrew Lee Balk, Lamar O. Mair, Pramod Pappachan Mathai, Paul N. Patrone, Wei Wang, Suzanne Ahmed, Thomas Mallouk, James Alexander Liddle, Samuel M Stavis
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915938

5. High-speed, high-purity separation of gold nanoparticle‹DNA origami constructs using centrifugation
Published: 7/23/2014
Authors: Seung H. Ko, Luis Fernando Vargas Lara, Paul N. Patrone, Samuel M Stavis, Francis Starr, Jack F Douglas, James Alexander Liddle
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915009

6. Nanofluidic Entropophoresis
Published: 5/29/2013
Authors: Samuel M Stavis, Elizabeth A Strychalski
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913873

7. A localized transition in the size variation of circular DNA in nanofluidic slitlike confinement
Published: 4/15/2013
Authors: Elizabeth A Strychalski, Samuel M Stavis, Jon C Geist
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910964

8. Measurement Uncertainties in MEMS Kinematics by Super-Resolution Fluorescence Microscopy
Published: 3/25/2013
Authors: Craig D. (Craig) McGray, Samuel M Stavis, Jon C Geist
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912891

9. MEMS Kinematics by Super-Resolution Fluorescence Microscopy
Published: 9/27/2012
Authors: Craig D. (Craig) McGray, Samuel M Stavis, Joshua Giltinan, Eric Eastman, Samara L. Firebaugh, Jenelle Piepmeier, Jon C Geist, Michael Gaitan
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910908

10. A Glowing Future for Lab on a Chip Testing Standards
Published: 6/28/2012
Author: Samuel M Stavis
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910438



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