Publications

Displaying 101 - 125 of 146

Photothermally excited force modulation microscopy for broadband nanomechanical property measurements

November 18, 2015

Author(s)

Ryan B. Wagner, Jason P. Killgore

We demonstrate photothermally excited force modulation microscopy (PTE FMM) for mechanical property characterization across a broad frequency range with an atomic force microscope (AFM). Photothermal actuation allows for an AFM cantilever driving force

Quantitative contact resonance force microscopy for viscoelastic measurement of soft materials in liquid

October 1, 2015

Author(s)

Allison B. Churnside, Ryan C. Tung, Jason P. Killgore

Viscoelastic property measurements made in liquid are key to characterizing materials for a variety of biological and industrial applications, but obtaining reliable data with nanoscale spatial resolution is challenging. Contact resonance force microscopy

Broadband frequency-dependent material property measurements with the atomic force microscope

June 8, 2015

Author(s)

Ryan B. Wagner, Jason P. Killgore

The atomic force microscope (AFM) is a widely utilized instrument for measuring nanometer-scale variations in mechanical properties. Most AFM techniques only measure these properties at a single high frequency (e.g. hundreds of kHz on resonance), or at low

Oxidation behavior of iron nanoparticles in mixed matrix membranes for water purification

January 23, 2015

Author(s)

Jessica D. Torrey, Jason P. Killgore, Lauren F. Greenlee, Robert L. Amaro

Vibrational shape tracking of atomic force microscopy cantilevers for improved sensitivity and accuracy of nanomechanical measurements

January 5, 2015

Author(s)

Ryan Wagner, Jason Killgore, Ryan C. Tung, Arvind Raman, Donna C. Hurley

Contact resonance atomic force microscopy (CR-AFM) methods currently utilize the eigenvalues, or resonant frequencies, of the AFM cantilever in contact to quantify local mechanical properties. However, the cantilever eigenmodes, or vibrational shapes, also

Characterizing the Free and Surface-Coupled Vibrations of Heated-Tip Atomic Force Microscope Cantilevers

August 6, 2014

Author(s)

Jason P. Killgore, Ryan C. Tung, Donna C. Hurley

Combining heated-tip atomic force microscopy (HT-AFM) with quantitative methods for determining surface mechanical properties creates an avenue for nanoscale thermomechanical property characterization. For nanomechanical methods that employ an atomic force

Liquid Contact Resonance Atomic Force Microscopy Via Experimental Reconstruction of the Hydrodynamic Function

June 11, 2014

Author(s)

Ryan C. Tung, Jason P. Killgore, Donna C. Hurley

We present an experimental method, based on analytical hydrodynamic theory, to accurately predict the inertial and viscous fluid loading forces at arbitrary frequencies in a contact resonance atomic force microscope system. Knowledge of the fluid loading

Engineering Plant Cell Walls: Tuning Lignin Monomer Composition for Deconstructable Biofuels Feedstocks or Resilient Biomaterials

February 27, 2014

Author(s)

Peter Ciesielski, Michael Resch, Barron Hewetson, Jason Killgore, Alexandra Curtin, Nick Anderson, Ann Chiaramonti Debay, Donna C. Hurley, Aric Sanders, Michael Himmel, Clint Chapple, Nathan Mosier, Bryon Donohoe

Advances in genetic manipulation of the biopolymers that compose plant cell walls will facilitate more efficient production of biofuels and chemicals from biomass and lead to specialized biomaterials with tailored properties. Here we investigate several

SPRITE: A modernized approach to scanning probe contact resonance imaging

January 20, 2014

Author(s)

Anthony B. Kos, Jason P. Killgore, Donna C. Hurley

We describe a system for contact resonance tracking called Scanning Probe Resonance Image Tracking Electronics (SPRITE). SPRITE can image two contact resonance frequencies simultaneously and thus can be used to acquire quantitative mechanical properties

Dynamic contact AFM methods for nanomechanical properties

December 1, 2013

Author(s)

Donna C. Hurley, Jason P. Killgore

This chapter focuses on two atomic force microscopy (AFM) methods for nanomechanical characterization: force modulation microscopy (FMM) and contact resonance (CR) techniques. FMM and CR methods share several common features that distinguish them from

Measurement of viscoelastic loss tangent with contact resonance modes of atomic force microscopy

November 26, 2013

Author(s)

Donna C. Hurley, Sara E. Campbell, Jason P. Killgore, Lewis M. Cox, Yifu Ding

We show how atomic force microscopy techniques based on contact resonance (CR) can be used to measure the viscoelastic loss tangent tan δ of polymeric materials. Absolute values of tan δ do not involve intermediate calculation of loss modulus and storage

Morphing Metal-Polymer Janus Particles

October 25, 2013

Author(s)

Lewis M. Cox, Jason Killgore, Zhengwei Li, Zheng Zhang, Donna C. Hurley, Jianliang Xiao, Yifu Ding

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 for macro

Hydrodynamic Corrections to Contact Resonance Force Microscopy Measurements of Viscoelastic Loss Tangent

July 9, 2013

Author(s)

Ryan C. Tung, Jason P. Killgore, Donna C. Hurley

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 fluid

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