Synthesis, Characterization, Modeling and Applications of Functional Porous Materials: Poster Session
Sponsored by: ACerS Basic Science Division
Program Organizers: Lan Li, Boise State University; Winnie Wong-Ng, National Institute of Standards and Technology; Kevin Huang, University of South Carolina
Monday 5:00 PM
October 10, 2022
Room: Ballroom BC
Location: David L. Lawrence Convention Center
Session Chair: Lan Li, Boise State University
E-18: Carbon Fibers Based Ultra-porous Epoxy Composites for Planar Multilayer Absorber Application: Hanadi Breiss1; Aicha El Assal1; Ratiba Benzerga1; Ala Sharaiha1; Ali Harmouch2; Akil Jrad2; 1University of Rennes, IETR; 2Université Libanaise, EDST
Today, porous composites are largely used to achieve microwave broadband absorbers. Here, a simple method was proposed to fabricate lightweight CFs/epoxy foam composites with high absorbing performance. Samples with different densities and CFs loads are elaborated and characterized in order to investigate the influence of these parameters on the structure and on the dielectric properties of composites. This shows that the material density can be reduced by one-third compared to the “standard” epoxy foam and the permittivity is reduced, due to the presence of more porosity, while maintaining a very high level of dielectric losses, which is very promising for the elaboration of EM absorbing materials. Finally, properties that ensure an impedance gradient are selected to make a multilayer prototype. The simulation and measurement of a very lightly loaded absorber were compared, in a 2-16 GHz frequency band, to those of the dense CFs/epoxy foam multilayer and commercial multilayer absorber.
E-19: Variation in the Bulk Elasticity of Nanoporous Materials from Solid Structure Mechanical Properties: Ryan Griffith1; Naji Mashrafi1; Matthew Beck1; 1University of Kentucky
The nanoscale mechanical properties of porous materials have long been questioned as representatives of the bulk properties on the macroscale and vice versa. As solid structures become porous, the alignment of ligaments and voids within the matrix contributes to the overall mechanical properties. This study aims to observe whether or not the bulk stiffness and Poisson’s ratio of a solid material can serve as predictors of the elasticity of a porous structure. It was found that variation in the mechanical properties resulted in a positively linear relationship with the elasticity.