George Hansen

Conductive Composites (United States)

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K. Lawrence DeVries

University of Utah

Joung‐Man Park

Gyeongsang National University

Sung‐Ju Kim

North Carolina State University

Dong‐Jin Yoon

Korea Research Institute of Standards and Science

David T. Fullwood

Provo College

Nathan Hansen

New York State Department of State

Oliver K. Johnson

Brigham Young University

Pyung-Gee Kim

Gyeongsang National University

Matt Pettit

Brigham Young University

G. C. Kaschner

Los Alamos National Laboratory

Cooperative Institutions

Brigham Young University

United States Air Force Research Laboratory

Los Alamos National Laboratory

Gyeongsang National University

Wright-Patterson Air Force Base

Lund University

University of Utah

Technische Universität Braunschweig

U.S. Air Force Institute of Technology

Sandia National Laboratories

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The Colossal Piezoresistive Effect in Nickel Nanostrand Polymer Composites and a Quantum Tunneling Model

Cmc-computers Materials & Continua (2010)

Oliver K. Johnson Calvin J. Gardner David T. Fullwood Nathan Hansen George Hansen

Piezoresistive effect

10.3970/cmc.2010.015.087

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Citations (14)

Self-sensing of CNF and Ni nanowire/PVDF and cellulose composites using electro-micromechanical test

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

Joung‐Man Park Pyung-Gee Kim Jung-Hoon Jang Sung‐Ju Kim Dong‐Jin Yoon

Self-sensing and actuation were investigated for carbon nanofiber (CNF) and Ni nanowire/polymer composites. Electro-micromechanical techniques can be used for evaluating self-sensing and interfacial properties indirectly under loading/subsequent unloading. Apparent modulus and contact resistivity for CNF/epoxy composites were evaluated as functions of different aspect ratio. CNF/epoxy composites with smaller aspect ratio shown to be higher apparent modulus due to high volume content in case of short aspect ratio. Surface energy via dynamic contact angle measurement was evaluated to obtain interfacial adhesion between nano-materials embedded matrix and carbon fiber sensor. Interfacial properties of CNF/epoxy with different aspect ratios were also obtained indirectly. CNF-PVDF, Ni nanowire-CNF-silicone and Ni nanowire-cellulose actuator were made successfully. Electrochemical actuator of CNF-PVDF was responded in electrolyte solution. Magnetic actuators of Ni nanowire-CNF-silicone and Ni nanowire-cellulose composites were monitored under electro-magnetic field with different frequency, wave function and voltage. Ni nanowire-CNF-silicone actuator with lightness and Ni nanowire-cellulose actuator with rapid frequency response having meaningful merits can be applied for various new smart structural materials.

10.1117/12.731389

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CVD Metallized Nanotubes and Crystals

Bulletin of the American Physical Society (2005)

Matt Pettit George Hansen M. Alexander

Source

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Multiscale Model for the Extreme Piezoresistivity in Silicone/Nickel Nanostrand Nanocomposites

Metallurgical and Materials Transactions A (2011)

Oliver K. Johnson Calvin J. Gardner Daniel Seegmiller Nathan A. Mara Andrew M. Dattelbaum

Piezoresistive effect

Percolation (cognitive psychology)

10.1007/s11661-011-0814-9

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Citations (15)

The Analysis of Lubricants on Magnetic Disks by Fourier Transform Infrared Spectroscopy

Applied Spectroscopy (1984)

F. Walder D. Warren Vidrine George Hansen

The analysis of fluorocarbon lubricant on magnetic storage disks by Fourier transform Infrared external reflectance spectroscopy is presented. Optimization of parameters for the analysis is discussed and methods of quantitative analysis are proposed. Results from a dedicated accessory for the task are shown.

Fourier transform spectroscopy

Attenuated total reflection

10.1366/0003702844554576

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Citations (8)

Actuation of electrochemical, electro-magnetic, and electro-active actuators for carbon nanofiber and Ni nanowire reinforced polymer composites

Composites Part B Engineering (2008)

Joung‐Man Park Sung‐Ju Kim Jung-Hoon Jang Zuojia Wang Pyung-Gee Kim

10.1016/j.compositesb.2008.03.009

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Citations (42)

Electromagnetic interference and electrical conductivity characteristics of carbon/polycyanate composite with nanostrandsTM under tensile load

Polymer Composites (2009)

S. Mall Benjamin T. Harder James C. Petrosky George Hansen M. D. Alexander

Electromagnetic interference (EMI) and electrostatic discharge (ESD) shielding effectiveness of M55/RS-3 composite (i.e., carbon fiber in a toughened polycyanate resin matrix) combined with nickel nanostrandsTM was investigated when subjected to the monotonic tensile load. These were quantified in the terms of dB attenuation and sheet resistance, respectively. A baseline panel without nanostrandsTM and three lay-ups with different locations of nickel nanostrandsTM layers were characterized. These locations were outside surfaces, dispersed throughout the laminate thickness or the mid-plane. The nanostrandsTM are capable of providing EMI and ESD shielding protection without any detrimental effects on the mechanical behavior of the composite (i.e., damage mechanisms and ultimate tensile strength) under the tensile loading condition. The placement of nanostrandsTM on the exterior surfaces in the composite lay-up provided better EMI and ESD shielding effectiveness. The EMI protection capability from nanostrandsTM at any location was practically constant with increasing tensile load up to the final fracture. However, sheet resistance did not change with increasing tensile load only when nanostrandsTM were placed at the outside surfaces. The nanostrandsTM layers were not damaged until the final composite fracture. POLYM. COMPOS., 31:1343–1351, 2010. © 2009 Society of Plastics Engineers

10.1002/pc.20919

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