Structure and electrical conductivity of polyvinyl alcohol films with multi-walled carbon nanotubes, cured in a magnetic field

The results of the study of the effect of the permanent magnetic field of a neodymium magnet on the polymerization process and the electrophysical characteristics of polyvinyl alcohol (PVA) films with the inclusion of multi-walled carbon nanotubes (MWCNTs) are presented. When studying the morphology of films using a scanning electron microscope, it was found that nanocomposite films with a thickness of 30 microns, cured in the presence of a magnetic field with the direction of the magnetic induction vector perpendicular to the surface of the films, have a homogeneous structure, while a significant number of MWCNTs agglomerations are observed in control samples of films. Measurements of the conductivity of films in the direction of the MWCNTs orientation at direct and alternating current showed that the conductivity of films obtained in a magnetic field significantly (by almost two orders of magnitude) exceeds the conductivity of control samples. The obtained results are analyzed on the basis of known models of electrical conductivity of nanocomposites with oriented MWCNTs. The degree of orientation of the MWCNTs during the curing of films in a magnetic field is estimated, taking into account the increase in the viscosity of the nanocomposite during the curing process.

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Influence of the magnetic field on the formation and properties of polyvinyl alcohol - multi-walled carbon nanotube nanocomposites

Journal of Physics Conference Series ◽

10.1088/1742-6596/2103/1/012108 ◽

2021 ◽

Vol 2103 (1) ◽

pp. 012108

Author(s):

S V Vasin ◽

M S Efimov ◽

A M Nizametdinov ◽

V A Sergeev

Keyword(s):

Magnetic Field ◽

Carbon Nanotubes ◽

Polyvinyl Alcohol ◽

Nanocomposite Films ◽

Polymerization Process ◽

Multiwalled Carbon ◽

Noticeable Effect ◽

Multi Walled Carbon Nanotube ◽

The Magnetic Field ◽

Control Samples

Abstract The effect of a magnetic field on the polymerization process and the electrophysical characteristics of polyvinyl alcohol (PVA) films with the inclusion of multiwalled carbon nanotubes (MWCNTs) was studied. Using SEM micrographs, it was shown that the films obtained under the action of a magnetic field have a more homogeneous structure, while a significant number of MCNT agglomerations are present in the control samples. In the study of the conductivity at direct and alternating current, it was found that the films obtained in a magnetic field have a conductivity that significantly exceeds the conductivity of the control samples. It has been shown that the use of a magnetic field during polymerization has a noticeable effect on the properties and characteristics of nanocomposite films based on PVA and MWCNTs.

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Direct writing of electronic circuits using functionalised multi-walled carbon nanotubes and polyvinyl alcohol conductive ink

Advances in Materials and Processing Technologies ◽

10.1080/2374068x.2021.1913325 ◽

2021 ◽

pp. 1-14

Author(s):

Syed Riyaz Ahammed ◽

Praveen Ayyappan Susila

Keyword(s):

Carbon Nanotubes ◽

Polyvinyl Alcohol ◽

Conductive Ink ◽

Direct Writing ◽

Electronic Circuits ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Enhancement of Electrical Conductivity of Aluminum-Based Nanocomposite Produced by Spark Plasma Sintering

Nanomaterials ◽

10.3390/nano11051150 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1150

Author(s):

Nicolás A. Ulloa-Castillo ◽

Roberto Hernández-Maya ◽

Jorge Islas-Urbano ◽

Oscar Martínez-Romero ◽

Emmanuel Segura-Cárdenas ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Spark Plasma Sintering ◽

Experimental Tests ◽

Powder Morphology ◽

Plasma Sintering ◽

Multi Walled Carbon Nanotubes ◽

Spark Plasma ◽

Ball Milling Technique ◽

Walled Carbon Nanotubes

This article focuses on exploring how the electrical conductivity and densification properties of metallic samples made from aluminum (Al) powders reinforced with 0.5 wt % concentration of multi-walled carbon nanotubes (MWCNTs) and consolidated through spark plasma sintering (SPS) process are affected by the carbon nanotubes dispersion and the Al particles morphology. Experimental characterization tests performed by scanning electron microscopy (SEM) and by energy dispersive spectroscopy (EDS) show that the MWCNTs were uniformly ball-milled and dispersed in the Al surface particles, and undesirable phases were not observed in X-ray diffraction measurements. Furthermore, high densification parts and an improvement of about 40% in the electrical conductivity values were confirmed via experimental tests performed on the produced sintered samples. These results elucidate that modifying the powder morphology using the ball-milling technique to bond carbon nanotubes into the Al surface particles aids the ability to obtain highly dense parts with increasing electrical conductivity properties.

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Enhancing the initial cracking fracture toughness of steel-polyvinyl alcohol hybrid fibers ultra high toughness cementitious composites by incorporating multi-walled carbon nanotubes

Construction and Building Materials ◽

10.1016/j.conbuildmat.2018.10.133 ◽

2019 ◽

Vol 195 ◽

pp. 269-282 ◽

Cited By ~ 7

Author(s):

Shilang Xu ◽

Yao Lyu ◽

Songjie Xu ◽

Qinghua Li

Keyword(s):

Carbon Nanotubes ◽

Fracture Toughness ◽

Polyvinyl Alcohol ◽

Cementitious Composites ◽

Hybrid Fibers ◽

High Toughness ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Synthesis, Characterization and Study of DC Electrical Conductivity of Poly[MWCNT/Imidoselenium] Composite

10.26434/chemrxiv.11441313 ◽

2019 ◽

Author(s):

Abeer O. Obeid ◽

Fatma Al-Yusufy ◽

Sama A Al-Aghbari ◽

omar alshujaa ◽

Yassin Gaber ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Selenium Dioxide ◽

Chemical Functionalization ◽

Dc Electrical Conductivity ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

The chemical functionalization of amino multi-walled carbon nanotubes (MWCNT-NH2) by selenium dioxide (SeO2) was used to produce Poly [MWCNT/Imidoselenium] composite. The prepared poly-composite was characterized by FTIR, SEM, TEM, XRD, UV, DSC and TGA. The DC electrical conductivity of poly-composite was 4.3×10-4 S/cm due to the interaction between the nanotubes.

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