Universal power law behavior of the AC conductivity versus frequency of agglomerate morphologies in conductive carbon nanotube-reinforced epoxy networks
Abstract
The Jonscher universal power law for ac conductivity versus frequency (f = /2) in the dispersion region was tested for a multiwall carbon nanotube/epoxy nanocomposite. The effect of changes in agglomerate morphology on the fitting parameters A and n in the equation ?ac = A?n was investigated. Changing nanotube agglomerate morphology was tracked by optical microscopy through curing. Evolving morphology was compared alongside ac conductivity obtained via a broadband dielectric spectrometer to elucidate possible physical meaning of the universal power law in the context of this system. The ?logA/n was unaffected by changes in agglomerate morphology affected during cure, yet connected with each other in their dependence on temperature. For this system, the relationship between the fitting parameters in the universal dynamic response equation remains empirical at this stage with regard to biphasic texture or morphology within such a network. Electrical conductivity ? versus frequency ? for a composite consisting of agglomerated multiwalled carbon nanotubes dispersed throughout a cured epoxy matrix was discovered to follow the empirical universal dynamic response equation of Jonscher. The frequency behavior of the exponent n is discussed in terms of underlying morphology throughout which charge carriers migrate.
Collections
- Center for Advanced Materials Research [1375 items ]
Related items
Showing items related by title, author, creator and subject.
-
In situ electron microscopy of Braille microsystems: Photoactuation of ethylene vinyl acetate/carbon nanotube composites
Czaniková, Klaudia; Krupa, Igor; Račko, Dušan; Šmatko, Vasilij; Campo, Eva M; Pavlova, Ewa; Omastová, Mária... more authors ... less authors ( Institute of Physics Publishing , 2015 , Article)The development of new types of tactile displays based on the actuation of composite materials can aid the visually impaired. Micro/nano systems based on ethylene vinyl acetate (EVA) polymeric matrices enriched with ... -
Nanocomposite photoactuators based on an ethylene vinyl acetate copolymer filled with carbon nanotubes
Czanikov� K.; Torras N.; Esteve J.; Krupa I.; Kas�k P.; Pavlova E.; Ra?ko D.; Chod�k I.; Omastov� M.... more authors ... less authors (2013 , Article)This paper reports strong, reversible actuation of nanocomposites on the base of ethylene vinyl acetate (EVA) filled with multiwalled (MWCNTs) and singlewalled carbon nanotubes (SWCNTs). The carbon nanotubes (CNTs) dispersion ... -
Ultra-Low Energy CNFET-Based Ternary Combinational Circuits Designs
Jaber R.A.; Aljaam J.M.; Owaidat B.; Al-Maadeed, Somaya; Kassem A.; Haidar A.M.... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2021 , Article)The embedded systems, IoT (Internet of Things) devices, and portable electronic devices spread very quickly recently. Most of them depend on batteries to operate. The target of this work is to decrease energy consumption ...