Fabrication of a low density carbon fiber foam and its characterization as a strain gauge
Daskam, Chris D.
MetadataShow full item record
Samples of carbon nano-fiber foam (CFF), essentially a 3D solid mat of intertwined nanofibers of pure carbon, were grown using the Constrained Formation of Fibrous Nanostructures (CoFFiN) process in a steel mold at 550Â°C from a palladium particle catalysts exposed to fuel rich mixtures of ethylene and oxygen. The resulting material was studied using Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX), Surface area analysis (BET), and Thermogravimetric Analysis (TGA). Transient and dynamic mechanical tests clearly demonstrated that the material is viscoelastic. Concomitant mechanical and electrical testing of samples revealed the material to have electrical properties appropriate for application as the sensing element of a strain gauge. The sample resistance versus strain values stabilize after a few compression cycles to show a perfectly linear relationship. Study of microstructure, mechanical and electrical properties of the low density samples confirm the uniqueness of the material: It is formed entirely of independent fibers of diverse diameters that interlock forming a tridimensional body that can be grown into different shapes and sizes at moderate temperatures. It regains its shape after loads are removed, is light weight, presents viscoelastic behavior, thermal stability up to 550Â°C, hydrophobicity, and is electrically conductive.
The article of record as published may be found at http://dx.doi.org/10.3390/ma7053699
Showing items related by title, author, creator and subject.
Dutta, Indranath (The United States of America as represented by the Secretary of the Navy, Washington, DC (US), 2010-10-12);A conformal metallic layer is applied to a selected region of a substrate by forming a pattern of electrically conductive lines on the substrate, placing a bead of a selected metal on the substrate at an edge of the region ...
Tucker, Joseph Robbins (Annapolis, Maryland: U.S. Naval Postgraduate School, 1949);In recent years the Navy has become very interested in any method that will decrease the size of various types of electrical rotating and stationary machinery and also to increase their reliability under normal operating ...
Feng, Bo-Kai (Monterey California. Naval Postgraduate School, 2006-09);In the frequency domain all materials can be described electrically by their complex permittivity and permeability. These constitutive parameters determine the response of the material to electromagnetic (EM) radiation. ...