Study of the electric field screening effect on low number of carbon fiber field emitters

2016 ◽  
Author(s):  
W. Tang ◽  
D. Shiffler ◽  
M. LaCour ◽  
K. Golby ◽  
T. Knowles
Keyword(s):  
Carbon Fiber ◽  
Electric Field ◽  
Screening Effect ◽  
Field Screening ◽  
Field Emitters

Analysis of electric field screening by the proximity of two knife-edge field emitters

2011 ◽  
Vol 110 (3) ◽  
pp. 034905 ◽  
Author(s):  
Wilkin Tang ◽  
Don Shiffler ◽  
Keith L. Cartwright
Keyword(s):  
Electric Field ◽  
Knife Edge ◽  
Field Screening ◽  
Edge Field ◽  
Field Emitters

Simulations and experimental study of electric field screening by the proximity of field emitters

IVEC 2012 ◽  
2012 ◽  
Author(s):  
Wilkin Tang ◽  
Don Shiffler ◽  
Sabrina Maestas ◽  
Ken Golby ◽  
Matthew LaCour ◽  
...  
Keyword(s):  
Experimental Study ◽  
Electric Field ◽  
Field Screening ◽  
Field Emitters

Study of the electric field screening effect for field emitter arrays

2015 ◽  
Vol 66 (8) ◽  
pp. 1186-1191 ◽  
Author(s):  
Nannan Li ◽  
Fei Yan ◽  
Shucai Pang ◽  
Lei Chen ◽  
Dazhi Jin ◽  
...  
Keyword(s):  
Electric Field ◽  
Screening Effect ◽  
Field Screening ◽  
Field Emitter ◽  
Field Emitter Arrays

Novel ring structure for minimisation of screening effect in carbon nanotube based field emitters

2013 ◽  
Vol 10 (1) ◽  
pp. 45-55 ◽  
Author(s):  
Seema Gautam ◽  
Preeti V. Shah ◽  
Pika Jha ◽  
Monika Kumari ◽  
Mamta Khaneja ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Ring Structure ◽  
Screening Effect ◽  
Field Emitters

BRIDGING OF CARBON FIBERS IN CF/EPOXY COMPOSITES USING ELECTROSTATICALLY INDUCED CNT ALIGNMENT

2021 ◽  
Author(s):  
DANDAN ZHANG ◽  
XINGKANG SHE ◽  
YIPENG HE ◽  
WESLEY A. CHAPKIN, ◽  
VI T. BREGMAN ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Electric Field ◽  
Carbon Fibers ◽  
Hybrid Composites ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Polymer Mixture ◽  
Ac Electric Field ◽  
Reinforced Polymer ◽  
Electric Field Direction

Carbon fiber reinforced polymer (CFRP) composites are lightweight materials with superior strength but are expensive due to the increased cost of carbon fibers (CFs). The addition of carbon nanotubes (CNTs) to polymer nanocomposites are becoming an excellent alternative to CF due to their unique combination of electrical, thermal, and mechanical properties. With the application of an electric field across the CNT/polymer mixture before curing, CNTs will not only be aligned along the electric field direction, but also form networks after reaching to a certain degree of alignment. In this study, an alternating current (AC) electric field was applied continuously to CNT/CF/Epoxy hybrid composites before curing. By cutting off the applied voltage when the monitored electric current increased, the degree of networking of CNTs between two CF tows was controlled. The relative electric field strength around the end of conductive carbon fiber tows in the epoxy matrix was modeled using COMSOL Multiphysics. It increased after applying AC electric field parallel to the CF tows, thereby increasing the alignment degree of CNTs and building a network to bridge the CF tows. The preliminary results indicate that the microhardness and tensile modulus between two CF tows are increased due to the networking of CNTs in this area. The fracture surface of the specimens after tensile tests were characterized to reveal more details of the microstructure.

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