ALIGNMENT OF CARBON NANOTUBES USING MAGNETIC NANOPARTICLES

Carbon nanotubes are driving scientific research nowadays. This field has several important directions in basic research, including chemistry, electronic transport, mechanical, and field emission properties. The most eye-catching features of carbon nanotubes are their electronic, mechanical, optical, and chemical characteristics, which open a way to future applications. One of the most important applications of nanotubes based on their properties will be as reinforcements in composite materials. One of the biggest concerns to nanotube industry is the alignment problem which has limited the usage and utilizations of carbon nanotubes in composites. The ability to impose a preferred alignment of carbon nanotubes in a composite will increase the effectiveness of utilizing nanotubes in composite applications. The alignment of nanotubes will maximize the interfacial bonding across the nanotube matrix interface. In this research, we developed a methodology and a process to align nanotubes in polymer nanocomposites by means of a magnetic field. By doing so, we will get a very strong nanocomposite that can be used in the composites industry. The proposed mechanism aims at aligning the carbon nanotubes by means of nanomagnetic particles that are adsorbed on the nanotube surfaces and by applying an external magnetic field. SEM analysis have shown that nanomagnetic particles with the assistance of the magnetic field were able to align the carbon nanotubes in the desired direction.

Download Full-text

Negative magnetoresistance of polymer nanocomposites on the basis of PP + Fe3O4 and PVDF + Fe3O4 in the magnetic field

Ferroelectrics ◽

10.1080/00150193.2018.1528943 ◽

2018 ◽

Vol 537 (1) ◽

pp. 191-197 ◽

Cited By ~ 1

Author(s):

M. A. Ramazanov ◽

A. M. Maharramov ◽

Luca Di Palma ◽

H. A. Shirinova ◽

F. V. Hajiyeva ◽

...

Keyword(s):

Magnetic Field ◽

Polymer Nanocomposites ◽

Negative Magnetoresistance ◽

The Magnetic Field

Download Full-text

Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field

Physical Review Letters ◽

10.1103/physrevlett.94.156802 ◽

2005 ◽

Vol 94 (15) ◽

Cited By ~ 81

Author(s):

P. Jarillo-Herrero ◽

J. Kong ◽

H. S. J. van der Zant ◽

C. Dekker ◽

L. P. Kouwenhoven ◽

...

Keyword(s):

Magnetic Field ◽

Carbon Nanotubes ◽

Electronic Transport

Download Full-text

Anisotropic Magnetoresistance of Stretched Sheets of Carbon Nanotubes

MRS Proceedings ◽

10.1557/opl.2012.360 ◽

2012 ◽

Vol 1407 ◽

Cited By ~ 1

Author(s):

Elena Cimpoiasu ◽

David Lashmore ◽

Brian White ◽

George A. Levin

Keyword(s):

Magnetic Field ◽

Carbon Nanotubes ◽

Carbon Nanotube ◽

Nitric Acid ◽

Electric Current ◽

Anisotropic Magnetoresistance ◽

Catalyst Nanoparticles ◽

Positive Term ◽

The Magnetic Field ◽

Bulk Carbon

ABSTRACTWe performed magnetoresistance (MR) measurements on bulk carbon nanotube sheets that had been partially aligned by post-fabrication stretching. The magnetic field was applied under different orientations with respect to the direction of the stretch, while the electric current was either parallel or perpendicular to the direction of the stretch. We found that the fielddependence of the MR is composed of two terms, one positive and one negative. The magnitudes of both terms are largest when the field is parallel with the direction of the stretch. If the sheets are treated with nitric acid, the positive term is removed and the MR is smallest when the field is aligned with the magnetic field. We attribute these anisotropic features to magnetoelastic effects induced by the coupling between the magnetic catalyst nanoparticles, the magnetic field, and the network of nanotubes.

Download Full-text

Modeling of Two-Dimensional Light Bullets Propagation in an Array of Carbon Nanotubes Taking into Account the Mechanical Tension and Magnetic Field

Mathematical Physics and Computer Simulation ◽

10.15688/mpcm.jvolsu.2020.3.4 ◽

2020 ◽

pp. 36-44

Author(s):

Natalia Konobeeva ◽

Dmitry Skvortsov

Keyword(s):

Magnetic Field ◽

Carbon Nanotubes ◽

Gauge Theory ◽

Magnetic Fields ◽

Electronic Spectrum ◽

Acoustic Field ◽

Two Dimensional ◽

Mechanical Tension ◽

Light Bullet ◽

The Magnetic Field

In this paper, we study the influence of acoustic and magnetic fields on the propagation of twodimensional light bullet in an array of carbon nanotubes. The acoustic field is taken into account in the framework of the gauge theory. A magnetic field is applied along the nanotube axis and leads to a change in the electronic spectrum of ?electrons. It is shown, that the pulse stably propagates in the medium, taking into account both of these factors. In this case, the magnetic field and tension slows down the pulse, as well as changes its amplitude.

Download Full-text

Study of Magnetic Field Distribution of Carbon Nanotubes Resulting from Current Pass by Magnetic Force Microscopy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.1103 ◽

2011 ◽

Vol 403-408 ◽

pp. 1103-1105

Author(s):

Haleh Kangarloo ◽

Mehrdad Teymurzadeh ◽

Saeid Rafizadeh

Keyword(s):

Magnetic Field ◽

Carbon Nanotubes ◽

Field Distribution ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Magnetic Field Distribution ◽

Force Microscopy ◽

Current Path ◽

Background Magnetic Field ◽

The Magnetic Field

Recently carbon nanotubes (CNTs) are reported to be able to generate large magnetic field because of their nanometer-size-diameter[2]. The magnetic fields around CNTs current path are investigated by magnetic force microscopy (MFM). Under the consideration of the magnetic properties of magnetically coated tip of MFM, tip heights, current directions, and background magnetic field, etc., the magnetic field distribution are analyzed. The distribution of the magnetic field generated by the CNTs current is found to be asymmetric, and its distribution anomaly is found to be a kind of hysteresis effect of the MFM cantilever materials.

Download Full-text

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.

Download Full-text

Comparison of Plasma and Magnetic Overshoots of Interplanetary Shocks

10.5194/egusphere-egu21-10163 ◽

2021 ◽

Author(s):

Natalia Borodkova ◽

Olga Sapunova ◽

Victor Eselevich ◽

Georgy Zastenker ◽

Yuri Yermolaev

Keyword(s):

Magnetic Field ◽

Mach Number ◽

Basic Research ◽

Field Measurements ◽

Ion Flux ◽

Interplanetary Shocks ◽

Mean Values ◽

Plasma Spectrometer ◽

Basic Research Grant ◽

The Magnetic Field

The structure of quasiperpendicular interplanetary (IP) shock fronts was studied based on the data from the BMSW plasma spectrometer, installed onboard the SPEKTR-R spacecraft, supplemented by magnetic field measurements on the WIND. Special attention was paid to periodic growths (overshoots) in the value of the ion flux relative to their mean values outside the ramp. A comparison of plasma overshoot was performed with the overshoot in the magnetic field, with the Mach number, and with the &#946; parameter. Based on the analysis of 26 crossings of IP shocks, in which the overshoots in the ion flux and magnetic field value were observed, it was shown that the value of the magnetic field overshoot is, on the average, less than a similar value in the solar wind&#8217;s ion flux, which is associated with different time resolution of measurements.The ion flux overshoot value is found to grow with the growth of the Mach number. It is shown that overshoots are formed not only in the supercritical shocks, but also in those with Mach numbers that are less than the value of the first critical Mach number. It is also found that the estimates of the coherent downstream oscillations of the ion flux and magnetic field good correlate with the convected ion gyroradius.This work was supported by the Russian Foundation for Basic Research, grant no. 19-02-00177.

Download Full-text

Additive Manufacturing of Conductive Polymer Nanocomposites Under the Influence of External Magnetic Field

Volume 1A: 36th Computers and Information in Engineering Conference ◽

10.1115/detc2016-59595 ◽

2016 ◽

Author(s):

Kiran Babu Koyalamudi ◽

Ruoyu Yang ◽

Rahul Rai

Keyword(s):

Magnetic Field ◽

Carbon Nanotubes ◽

Additive Manufacturing ◽

External Magnetic Field ◽

Polymer Nanocomposites ◽

Multiwalled Carbon Nanotubes ◽

Polymer Matrix ◽

Conductive Polymer ◽

Multiwalled Carbon ◽

Preferential Alignment

Conductive polymer nanocomposites (CPNCs) have gained a lot of attention by the researchers, in recent times, due to their diverse technological applications in different domains. This paper discusses the additive manufacturing of conductive polymer nanocomposite. Maghemite-Multiwalled carbon nanotubes were synthesized, and later dispersed in an acrylate resin, followed by curing with UV DLP 3D printer, under the presence of external magnetic field. Maghemite-Multiwalled carbon nanotubes showed superior magnetic properties, when compared to Multiwalled carbon nanotubes and lead to improvements in preferential alignment of filler material in the polymer matrix. The initial experimental results show preferential alignment of Maghemite-Multiwalled carbon nanotubes in the polymer matrix under the influence of external uniform magnetic field, at an intensity of 120 Gauss.

Download Full-text