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1. Orthogonal Analysis of Functional Gold Nanoparticles for Biomedical Applications
Published: 9/11/2015
Authors: De-Hao D. Tsai, Yi-Fu Lu, Frank W DelRio, Tae Joon Cho, Suvajyoti S. Guha, Michael Russel Zachariah, Fan Zhang, Andrew John Allen, Vincent A Hackley
Abstract: We report a comprehensive strategy based on implementation of orthogonal measurement techniques to provide critical and verifiable material characteristics for functionalized gold nanoparticles (AuNPs) used in biomedical applications. Thiolated polye ...

2. Heterogeneity and length scale effects in PEG-based hydrogels
Published: 8/10/2015
Authors: Brian G Bush, Jenna M Shapiro, Frank W DelRio, Robert Francis Cook, Michelle L. Oyen
Abstract: Colloidal-probe spherical indentation load-relaxation experiments are conducted on poly(ethylene glycol) (PEG) hydrogel materials to quantify the steady-state mechanical properties and time-dependent transport properties in a single experiment. A pr ...

3. Micromechanical Testing of Electroplated Gold Alloy Films using Theta-Like Specimens
Published: 7/2/2015
Authors: Mark McLean, William A Osborn, Oliver Boomhower, Christopher Keimel, Rebecca Kirkpatrick, Frank W DelRio
Abstract: Micromechanical testing of electroplated gold alloy films has been conducted using the theta specimen geometry. Specimens were formed by a standard combination of photolithography, electroplating, and deep reactive ion etching. Testing was perfor ...

4. Fracture strength of micro- and nano-scale silicon components
Published: 5/13/2015
Authors: Frank W DelRio, Robert Francis Cook, Brad Boyce
Abstract: Silicon devices are ubiquitous in many micro- and nano-scale technological applications, most notably microelectronics and microelectromechanical systems (MEMS). Despite their widespread usage, however, issues related to uncertain mechanical reliabi ...

5. Design and test of reliable, high strength, ingressive polycrystalline silicon microgripper arrays
Published: 1/2/2015
Authors: Siddharth Hazra, J L Beuth, Grant A. Myers, Frank W DelRio, Maarten de Boer
Abstract: We present the design and extensive validation of a micromachined gripper array that enables reliable transmission of forces up to 10 milliNewtons. The gripper is constructed with polycrystalline silicon, a brittle material. Two ingressive snap-a ...

6. Stress mapping of micromachined polycrystalline silicon devices via confocal Raman microscopy
Published: 6/15/2014
Authors: Grant A. Myers, Siddharth Hazra, Maarten de Boer, Chris A Michaels, Stephan J Stranick, Ryan P. Koseski, Robert Francis Cook, Frank W DelRio
Abstract: Stress mapping of micromachined polycrystalline silicon devices with components in various levels of uniaxial tension was performed. Confocal Raman microscopy was used to form two-dimensional maps of Raman spectral shifts, which exhibited variations ...

7. Controlled Formation and Characterization of Dithiothreitol-Conjugated Gold Nanoparticle Clusters
Published: 3/5/2014
Authors: De-Hao D. Tsai, Tae Joon Cho, Frank W DelRio, Justin M Gorham, Jiwen Zheng, Jiaojie Tan, Michael Russel Zachariah, Vincent A Hackley
Abstract: We report a systematic study of the controlled formation of discrete-size gold nanoparticle clusters (GNCs) by interaction with the reducing agent dithiothreitol (DTT). Asymmetric-flow field flow fractionation and electrospray differential mobility a ...

8. Frictional properties of native and functionalized type I collagen thin films
Published: 10/2/2013
Authors: Koo-hyun Chung, Antony Chen, Christopher Anderton, Kiran Bhadriraju, Anne L Plant, Brian G Bush, Robert Francis Cook, Frank W DelRio
Abstract: Frictional properties of native and fibronectin (FN)-functionalized type I collagen (COL) thin films were studied via atomic force microscopy. The COL lateral contact stiffness was dependent only on the hydration state, indicating that shear deformat ...

9. Decoupling small-scale roughness and long-range features on deep reactive ion etched silicon surfaces
Published: 9/19/2013
Authors: Frank W DelRio, Lawrence H Friedman, Michael S. Gaither, William A Osborn, Robert Francis Cook
Abstract: Roughness scaling of three different deep reactive ion etched (DRIE) silicon surfaces is investigated using atomic force microscopy. At small distances, height-height correlations H reveal power-law behavior with equal scaling exponents for all surf ...

10. Temperature-Programmed Electrospray-Differential Mobility Analysis for Characterization of Ligated Nanoparticles in Complex Media
Published: 8/12/2013
Authors: De-Hao D. Tsai, Frank W DelRio, John M Pettibone, Pin Ann Lin, Jiaojie Tan, Michael Russel Zachariah, Vincent A Hackley
Abstract: In this study, an electrospray-differential mobility analyzer (ES-DMA) was operated with an aerosol flow-mode, temperature-programmed approach to enhance its ability to characterize the particle size distributions (PSDs) of nanoscale particles (NPs) ...

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