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You searched on: Author: jason killgore

Displaying records 11 to 20 of 21 records.
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11. Morphing Metal-Polymer Janus Particles
Published: 10/25/2013
Authors: Lewis M Cox, Jason Philip Killgore, Zhengwei Li, Zheng Zhang, Donna C. Hurley, Jianliang Xiao, Yifu Ding
Abstract: Shape memory polymers have the unique ability to memorize and recover their permanent shapes after being programmed to hold high strain levels up to a few hundred percent. While studies have traditionally focused on utilizing shape memory effects ...

12. Hydrodynamic Corrections to Contact Resonance Force Microscopy Measurements of Viscoelastic Loss Tangent
Published: 7/9/2013
Authors: Ryan C. Tung, Jason Philip Killgore, Donna C. Hurley
Abstract: We present a method to improve accuracy in measurements of nanoscale viscoelastic material properties with contact resonance (CR) AFM methods. Through the use of the two-dimensional hydrodynamic function, we obtain a more precise estimate of the flu ...

13. Anomalous Friction in Suspended Graphene
Published: 9/20/2012
Authors: Alexander Y Smolyanitsky, Jason Philip Killgore
Abstract: Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics s ...

14. Quantitative Viscoelastic Mapping of Polyolefin Blends with Contact Resonance Atomic Force Microscopy
Published: 5/9/2012
Authors: Dalia Yablon, Anil Gannepalli, Roger Proksch, Jason Philip Killgore, Donna C. Hurley, Andy Tsou
Abstract: The storage modulus (E') and loss modulus (E") of polyolefin blends have been mapped on the nanoscale with contact resonance force microscopy (CR-FM), a dynamic contact mode of atomic force microscopy (AFM). CR-FM maps for a blend of polyethylene, po ...

15. Relationship between Barrier Layer Tg and TFC Membrane Performance: Effect of Chlorine Treatment
Published: 3/8/2012
Authors: Sajjad H. Maruf, Dae U. Ahn, John Pellegrino, Jason Philip Killgore, Alan R. Greenberg, Yifu Ding
Abstract: Thin film composite (TFC) reverse osmosis (RO) membranes play a significant role in addressing rapidly expanding global needs for potable water. A well-known problem of TFC membranes is their sensitivity to oxidizing agents such as chlorine, whi ...

16. Pulsed Contact Resonance in the Atomic Force Microscope
Published: 1/30/2012
Authors: Jason Philip Killgore, Donna C. Hurley

17. Low Force AFM Nanomechanics with Higher-Eigenmode Contact Resonance Spectroscopy
Published: 1/11/2012
Authors: Jason Philip Killgore, Donna C. Hurley
Abstract: Atomic force microscopy (AFM) methods for quantitative measurements of elastic modulus on stiff (>10 GPa) materials typically require tip-sample contact forces in the hundreds of nanonewton to few micronewton range. Such large forces can incur sa ...

18. Effect of elastic deformation on frictional properties of few-layer graphene
Published: 1/9/2012
Authors: Alexander Y Smolyanitsky, Jason Philip Killgore, Vinod K Tewary
Abstract: We describe the results of Brownian dynamics (BD) simulations of an AFM tip scanned on locally suspended few-layer graphene. The effects of surface compliance and sample relaxation are directly related to the observed friction force. We demonstrate t ...

19. Viscoelastic Property Mapping with Contact Resonance Force Microscopy
Published: 11/4/2011
Authors: Jason Philip Killgore, Donna C. Hurley, Dalia Yablon, Joseph Turner, Philip Yuya, Roger Proksch, Anil Gannepalli, Andy Tsou
Abstract: We demonstrate accurate nanoscale mapping of loss and storage modulus on a polystyrene-polypropylene blend with contact resonance force microscopy (CR-FM). The viscoelastic properties are extracted from spatially resolved maps of the contact resonanc ...

20. Quantitative Subsurface Contact Resonance Force Microscopy of Model Polymer Nanocomposites
Published: 3/16/2011
Authors: Jason Philip Killgore, Jennifer Y. Kelly, Christopher M Stafford, Michael J Fasolka, Donna C. Hurley
Abstract: We present experimental results on the use of quantitative contact resonance force microscopy (CR-FM) for mapping the planar location and depth of 50 nm silica nanoparticles buried beneath polystyrene films 30 nm to 165 nm thick. The presence of sha ...

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