scholarly journals Polypropylene Carbon Nanotubes Nanocomposites: Combined Influence of Block Copolymer Compatibilizer and Melt Annealing on Electrical Properties

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Aline Emplit ◽  
Fang Fang Tao ◽  
Pascale Lipnik ◽  
Guido Heunen ◽  
Christian Bailly ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Block Copolymer ◽  
Electrical Properties ◽  
Electrical Circuit ◽  
Equivalent Electrical Circuit ◽  
Emi Shielding ◽  
Frequency Range ◽  
Microwave Frequencies ◽  
Melt Annealing ◽  
And Control

We study the influence of melt annealing and the presence of a block copolymer compatibilizer on the electrical properties of polypropylene carbon nanotubes (CNT) nanocomposites from the DC limit to microwave frequencies and link it to the morphological details. We show that the compatibilizer concentration controls three types of morphologies: separate CNT agglomerates, a network of well dispersed but interconnected CNT, and individualized but separate nanotubes. This explains why conductivity reaches an optimum over the whole frequency range at a low compatibilizer concentration. We model the corresponding structures by a semiquantitative schematic equivalent electrical circuit. A key outcome of the work is the understanding and control of dispersion mechanisms in order to optimize the electrical performances for efficient EMI shielding depending on the targeted frequency range.

Influence of melt annealing on rheological and electrical properties of compatibilized multiwalled carbon nanotubes in polypropylene

2014 ◽  
Author(s):  
Giuseppe Nasti ◽  
Veronica Ambrogi ◽  
Pierfrancesco Cerruti ◽  
Gennaro Gentile ◽  
Rosa Di Maio ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Melt Annealing

scholarly journals Electrical properties of compacted carbon nanomaterials

2021 ◽  
Vol 340 ◽  
pp. 01047
Author(s):  
Nikita I. Lapekin ◽  
Artem A. Shestakov ◽  
Andrey E. Brester ◽  
Arina V. Ukhina ◽  
Alexander G. Bannov
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Carbon Nanofibers ◽  
Carbon Nanomaterials ◽  
Frequency Range ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Cylindrical Samples

In this paper, the electrical properties of various compacted carbon nanomaterials were investigated. Compacted carbon nanomaterials (carbon nanofibers, multi-walled carbon nanotubes) were compacted into cylindrical samples and the electrical properties were measured in a frequency range from 50 Hz to 1MHz.

scholarly journals Equivalent Electrical Model of an Inductor Excited by a Triangular Current Including Saturation

2020 ◽  
Vol 22 (3) ◽  
pp. 110-118
Author(s):  
Jorge Rafael Gonzalez-Teodoro ◽  
Enrique Romero-Cadaval ◽  
Rafael Asensi ◽  
Vladimir Kindl
Keyword(s):  
Power Loss ◽  
Power Converters ◽  
Electrical Circuit ◽  
Equivalent Electrical Circuit ◽  
Electrical Model ◽  
Frequency Range ◽  
Element Analysis ◽  
3D Finite Element ◽  
Sinusoidal Current ◽  
Different Levels

A model for an equivalent electrical circuit designed for a ferrite (3C90) inductor usually used in power converters excited by a non-sinusoidal current appropriate for use in power electronics is proposed. This study, based on 3D finite element analysis, leads to significant precision advantages over 2D analysis for non-symmetric inductors. The frequency range of the analysis for the toroidal core was between 15 kHz and 1 GHz, with different levels of excitation in non-saturation and saturation status focusing on the power loss.

scholarly journals EFFECT OF CARBON NANOTUBES ON THE ELECTRICAL PROPERTIES OF THE POLYMERIC COMPOSITES

2019 ◽  
Vol 3 ◽  
pp. 45
Author(s):  
Sergey Gango ◽  
Konstantin Gusev ◽  
Evgeniy Ilin ◽  
Mikhail Predtechensky ◽  
Vladimir Solovyev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Experimental Study ◽  
Electrical Properties ◽  
Polymeric Composite ◽  
Frequency Range ◽  
Ac Electrical Conductivity ◽  
Current Voltage ◽  
Temperature Dependences ◽  
Current Voltage Characteristics

Experimental study of single-wall carbon nabotubes (CNT) effect on the electrical properties of polymeric composite materials based on epoxy matrix has been carried out. Direct-current (DC) as well as alternating-current (AC) electrical conductivity of nanocomposites with different CNT concentrations have been investigated in the temperature interval from 293 K to 373 K. Measurements of Seebeck coefficient confirm n-type conductivity of composite with CNTs. Percolation threshold of the composite material under study has been estimated. It has been found that addition of single-wall CNT at low concentration causes hysteresis of current-voltage characteristics and the temperature dependences of electrical conductivity as well as its anisotropy in the samples under study. No noticeable frequency dependence of the AC electrical conductivity has been found in the frequency range from 100 Hz to 300 kHz.

An effective EMI shielding material based on poly(trimethylene terephthalate) blend nanocomposites with multiwalled carbon nanotubes

2018 ◽  
Vol 42 (16) ◽  
pp. 13915-13926 ◽  
Author(s):  
Ajitha A. R ◽  
Mohammed Arif P ◽  
Aswathi M. K ◽  
Lovely P. Mathew ◽  
Geethamma V. G ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Multiwalled Carbon Nanotubes ◽  
Emi Shielding ◽  
Multiwalled Carbon ◽  
Blend Ratio ◽  
Trimethylene Terephthalate ◽  
Blend Nanocomposites ◽  
Shielding Material ◽  
Mwcnt Loading

The effects of blend ratio and MWCNT loading on the morphology, electrical properties and electromagnetic shielding performance of poly(trimethylene terephthalate) (PTT)/polypropylene (PP) blend nanocomposites were studied.

EMI Shielding Effectiveness of CNTs Composites

2013 ◽  
Vol 331 ◽  
pp. 439-442 ◽  
Author(s):  
Ping Li ◽  
Aik Seng Low ◽  
Yue Yan Shan ◽  
Guat Choon Ong ◽  
Xi Jiang Yin
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
Conductive Network ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
5 Ghz

A carbon nanotubes (CNTs) composite and its electromagnetic interference shielding effectiveness (SE) were investigated. Its absorptance, reflectance and shielding effectiveness (SE) were analysed. The CNTs composite has a shielding effectiveness (SE) of more than 25 dB (>99.68%) in frequency range from 30 MHz to 5 GHz. The testing results also demonstrate that the shielding mechanism of the CNTs composite is mainly EMI absorption of electromagnitic radiation. The high SE of the CNTs composite in the study is attributed to a high aspect ratio (>3000) and good conductive network of CNTs within the composite.

scholarly journals Диэлектрическая спектроскопия и особенности механизма фазового перехода полупроводник-металл в пленках VO-=SUB=-2-=/SUB=-

2020 ◽  
Vol 54 (2) ◽  
pp. 153
Author(s):  
А.В. Ильинский ◽  
Р.А. Кастро ◽  
М.Э. Пашкевич ◽  
Е.Б. Шадрин
Keyword(s):  
Phase Transition ◽  
Electrical Properties ◽  
Vanadium Dioxide ◽  
Thermal Hysteresis ◽  
Hysteresis Loops ◽  
Electrical Circuit ◽  
Equivalent Electrical Circuit ◽  
Transition Mechanism ◽  
Metal Phase Transition ◽  
Frequency Dependences

Abstract In the range of 0.1–10^6 Hz, the temperature-induced transformation of the frequency dependences of the dielectric-loss tangent tanδ( f ) as well as the Cole–Cole diagrams for undoped vanadium-dioxide films are investigated. The measurements are carried out in the temperature range T = 273–373 K. It is shown that the shape of the Cole–Cole diagrams for all films depends slightly on the temperature in the specified interval, while the frequencies f _0 corresponding to the peaks of the function tanδ( f ) increase with temperature. The thermal-hysteresis loops of the frequency positions f _0( T ) of the peaks are measured. When interpreting the data of dielectric spectroscopy, a complex equivalent electrical circuit of the sample is used; it makes it possible to detect the presence of two types of grains with different electrical properties in undoped VO_2 films. The presence of two types of grains determines the features of the semiconductor–metal phase-transition mechanism in VO_2 films.

scholarly journals Исследование методом импедансной спектроскопии полимерного композита с углеродными нанотрубками в контакте с электролитом

2019 ◽  
Vol 89 (9) ◽  
pp. 1400
Author(s):  
И.А. Маркевич ◽  
Н.А. Дрокин ◽  
Г.Е. Селютин
Keyword(s):  
Molecular Weight ◽  
Polymer Composite ◽  
Electrical Impedance ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Double Electric Layer ◽  
Electrical Circuit ◽  
Equivalent Electrical Circuit ◽  
Frequency Range ◽  
Ultrahigh Molecular Weight ◽  
Carbon Nano Tubes

The results of measurements of the frequency dependence of the electrical impedance of the composite based on ultrahigh-molecular-weight polyethylene modified with carbon nano-tubes in contact with an electrolyte are presented. The behavior of the active and reactive com-ponents of the impedance, dielectric constant and conductivity in the frequency range from 0.1 Hz to 120 MHz was analyzed. Equivalent electrical circuit that simulate the impedance disper-sion of the polymer composite in contact with an electrolyte were proposed. It was shown that a double electric layer appears at the boundary between the polymer composite and electrolyte lay-er, the electrophysical characteristics of which were determined.

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