Complex permittivity and microwave absorption properties of carbon nanotubes/polymer composite: A numerical study

Peng, Zhihua; Peng, J.; Cheng, Junsheng; Yangyu, OU; Yan-tao, Ning

doi:10.1016/j.physleta.2008.02.015

Cited by 43 publications

(11 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The composite's complex conductivity, σ*, is defined in Eq . 5 [33]. where σ′ is the in‐phase component of conductivity, σ″ is the out‐of‐phase component of conductivity, ε* is the complex permittivity comprising of an in‐phase component, ε′ and an out‐of‐phase component, ε″.…”

Section: Resultsmentioning

confidence: 99%

Development and characterization of solid and porous polylactide‐multiwall carbon nanotube composites

Rizvi

Khan

Naguib

2010

Polymer Engineering & Sci

View full text Add to dashboard Cite

This article describes the fabrication of solid and porous polylactide (PLA)‐multiwall carbon nanotube (MWNT) composites prepared using melt blending and subsequent batch processing of porous structures. The morphology and thermal, rheological and electrical properties of the PLA‐MWNT composites prepared with MWNT concentrations of 0, 0.5, 1, 2, and 5 wt% were characterized. The composite structure consisted of identifiable regions of MWNT aggregation and MWNT dispersion. Increasing MWNT content was found to increase the thermal stability and crystallization kinetics of PLA. The addition of MWNT to PLA significantly increased the melt viscosity and electrical conductivity of the composites. Based on rheological and electrical measurements, a continuous MWNT network structure in PLA was found to form when the concentration of MWNT is increased from 0.5 wt% (0.33 vol%) to 1 wt% (0.66 vol%). As many current day applications of polymers and polymer composites require lightweight and low‐density materials, porous PLA‐MWNT composites were fabricated from a batch porous structure processing technique. Porous PLA‐MWNT composites containing 2 and 5 wt% MWNT had lower relative densities, which is attributed to the higher viscosity of the composites suppressing collapse of the porous structure during processing. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers

show abstract

Section: Resultsmentioning

confidence: 99%

Development and characterization of solid and porous polylactide‐multiwall carbon nanotube composites

Rizvi

Khan

Naguib

2010

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…Determination of the Absorptivity with Short-Circuited Resonator. The microwave absorption factor with Z in is known [9][10][11][12][13][14][15][16][17][18] to depend nonlinearly on the concentration and particle size of inclusions and on a combination of their properties:…”

Section: Resultsmentioning

confidence: 99%

Microwave absorptivity of refractory powders depending on particle size

Shpil’ko

Kirilenko

Soltis

et al. 2010

Powder Metall Met Ceram

View full text Add to dashboard Cite

The microwave absorptivity of refractory metallic compounds at 2. 45 and 9.53 GHz is studied. It is ascertained that electromagnetic absorption is influenced by the grain size of absorbing particles: when it increases by 10 times, the absorptivity of ZrC, ZrSi 2 , HƒC, TaN, HƒN, ZrN, and NbC particles becomes higher by a factor of 7 and that of SiC, NbSi 2 , WC, B 4 C, MoSi 2 , and VN particles only by a factor of 2 to 4. It is connected with the physical properties of each compound: magnetic permeability (sign and magnitude), thermal e.m.f. (sign and magnitude), and active ac resistance. It is shown that stoichiometric impurity (namely, the formation of nonmetal vacancies) increases the microwave absorptivity, while the formation of substitution phases does not change the nature of microwave interaction. It is established that the morphology of particles with the same sizes does not influence the microwave absorptivity. It is proved that the measurement of absorption in weak fields can be used for nondestructive examination of refractory metallic compounds.

show abstract

“…Many research groups have studied the intrinsic nature and the chemical modification of the conductive particles and the physical characteristics of materials such as shape, 5 size, 6 aggregation, 7 surface area, 8 and so on. Among the most interesting particles are the carbon single-walled 9 and multi-walled nanotubes, 10,11 nanofibers, 12 carbon blacks (CBs), 13 metallic particles, 14 and others. 15…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the processing parameters of polymer conductive semicrystalline polymer composites with carbon black

Ibarrola

López

Vigueras-Santiago

et al. 2013

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

This work presents how the optimization of polymer conductive composites constituting the semi-crystalline polymer matrix (low-density polyethylene (LDPE) and isotactic polypropylene (it-PP)) and carbon black (CB) by melt-mixing process, has an important influence not only in diminishing the resistivity of the composite but also in reducing the critical concentration of CB. The experimental procedure consists of studying the influence of processing parameters such as mixing temperature, time, and speed on the electrical resistivity values. Optimal parameters are considered as those obtained with the lowest standard deviation for electrical resistivity and a reduction in resistivity in comparison with the arbitrary conditions established as preliminary or reference. The control of those parameters allows in attaining an important reduction (7%) in the critical CB concentration at threshold percolation in both the studied composites in comparison

show abstract

Complex permittivity and microwave absorption properties of carbon nanotubes/polymer composite: A numerical study

Cited by 43 publications

References 55 publications

Development and characterization of solid and porous polylactide‐multiwall carbon nanotube composites

Development and characterization of solid and porous polylactide‐multiwall carbon nanotube composites

Microwave absorptivity of refractory powders depending on particle size

Experimental study of the processing parameters of polymer conductive semicrystalline polymer composites with carbon black

Contact Info

Product

Resources

About