Analysis of the Piezoelectric Properties of Aligned Multi-Walled Carbon Nanotubes

Recent studies reveal that carbon nanostructures show anomalous piezoelectric properties when the central symmetry of their structure is violated. Particular focus is given to carbon nanotubes (CNTs) with initial significant curvature of the graphene sheet surface, which leads to an asymmetric redistribution of the electron density. This paper presents the results of studies on the piezoelectric properties of aligned multi-walled CNTs. An original technique for evaluating the effective piezoelectric coefficient of CNTs is presented. For the first time, in this study, we investigate the influence of the growth temperature and thickness of the catalytic Ni layer on the value of the piezoelectric coefficient of CNTs. We establish the relationship between the effective piezoelectric coefficient of CNTs and their defectiveness and diameter, which determines the curvature of the graphene sheet surface. The calculated values of the effective piezoelectric coefficient of CNTs are shown to be between 0.019 and 0.413 C/m2, depending on the degree of their defectiveness and diameter.

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Void characteristics and mechanical strength of cementitious mortars containing multi-walled carbon nanotubes

Journal of Composite Materials ◽

10.1177/0021998319896016 ◽

2019 ◽

Vol 54 (17) ◽

pp. 2283-2295

Author(s):

Arash Sedaghatdoost ◽

Kiachehr Behfarnia ◽

Ali Hendi ◽

Mohammad Bayati

Keyword(s):

Carbon Nanotubes ◽

Flexural Strength ◽

Mechanical Strength ◽

Optimum Dosage ◽

Cement Mortars ◽

Multi Walled Carbon Nanotubes ◽

Void Shape ◽

Walled Carbon Nanotubes ◽

First Time ◽

The Relationship

In this paper, the relationship between mechanical strength and void characteristics including porosity, the mean area of voids (MAV), and circularity was determined for the first time by analyzing the petrographic images of some cement mortars containing multi-walled carbon nanotubes (MWCNTs). The results showed that the compressive, tensile, and flexural strength for specimens containing 0.1% MWCNTs (optimum dosage of MWCNT) were 21, 12.5, and 9.5% more than that of the control samples, respectively. Also, it was shown that the application of MWCNTs can change the shape and the amount of voids, thereby imposing a significant impact on the mortar behavior. For the optimum dosage of MWCNTs, the porosity and MAV decreased about 63 and 71%, respectively, while the circularity enhanced 23% in comparison with the ordinary mortar samples. The void shape is one of the reasons for the enhanced properties of the MWCNT mortars. The image processing of the petrographic specimens and probability theorization revealed that the circularity of the voids had a significant impact on the flexural strength of the mortars, while the compressive strength was mostly affected by only the amount of porosity.

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Incorporation of Multi Wall Carbon Nanotubes into Glass-Surfaces via Laser-Treatment

MRS Proceedings ◽

10.1557/proc-772-m2.8 ◽

2003 ◽

Vol 772 ◽

Cited By ~ 1

Author(s):

T. Seeger ◽

G. de la Fuente ◽

W.K. Maser ◽

A.M. Benito ◽

A. Righi ◽

...

Keyword(s):

Carbon Nanotubes ◽

Continuous Wave ◽

Silica Surface ◽

Multi Wall Carbon Nanotubes ◽

Composite Formation ◽

Multi Walled Carbon Nanotubes ◽

Glass Surfaces ◽

Walled Carbon Nanotubes ◽

First Time ◽

Scanning Electron

AbstractCarbon nanotubes (CNT) are interesting candidates for the reinforcement in robust composites and for conducting fillers in polymers due to their fascinating electronic and mechanical properties. For the first time, we report the incorporation of multi walled carbon nanotubes (MWNTs) into silica-glass surfaces by means of partial surface-melting caused by a continuous wave Nd:YAG laser. MWNTs were detected being well incorporated in the silica-surface. The composites are characterized using scanning electron microscopy (SEM) and Raman-spectroscopy. A model for the composite-formation is proposed based on heatabsorption by MWNTs and a partial melting of the silica-surface.

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Silsesquioxane-cored star amphiphilic polymer as an efficient dispersant for multi-walled carbon nanotubes

RSC Advances ◽

10.1039/c6ra00130k ◽

2016 ◽

Vol 6 (36) ◽

pp. 30401-30404 ◽

Cited By ~ 1

Author(s):

Shuxi Gao ◽

Zhiwei Yu ◽

Kai Xu ◽

Jun Peng ◽

Yuxiu Xing ◽

...

Keyword(s):

Carbon Nanotubes ◽

Amphiphilic Polymer ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

First Time

One octopus-shaped amphiphilic polymer was used to functionalize MWNTs for the first time.

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Rapid and sensitive quantification of cell-associated multi-walled carbon nanotubes

Nanoscale ◽

10.1039/d0nr03330h ◽

2020 ◽

Vol 12 (33) ◽

pp. 17362-17372

Author(s):

Lukas Steinmetz ◽

Joel Bourquin ◽

Hana Barosova ◽

Laetitia Haeni ◽

Jessica Caldwell ◽

...

Keyword(s):

Carbon Nanotubes ◽

Multi Walled Carbon Nanotubes ◽

Lock In ◽

Walled Carbon Nanotubes ◽

First Time

For the first time lock-in thermography is utilized to assess cell-associated nanoparticles and carbon nanotubes.

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The relationship between the diameter of chemically-functionalized multi-walled carbon nanotubes and their organ biodistribution profiles in vivo

Biomaterials ◽

10.1016/j.biomaterials.2014.07.054 ◽

2014 ◽

Vol 35 (35) ◽

pp. 9517-9528 ◽

Cited By ~ 31

Author(s):

Julie T-W. Wang ◽

Chiara Fabbro ◽

Enrica Venturelli ◽

Cécilia Ménard-Moyon ◽

Olivier Chaloin ◽

...

Keyword(s):

Carbon Nanotubes ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

The Relationship

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Carbon nanotubes and carbon fibers in a flash: an easy and convenient preparation of carbon nanostructures using a conventional microwave

Canadian Journal of Chemistry ◽

10.1139/cjc-2019-0244 ◽

2020 ◽

Vol 98 (1) ◽

pp. 49-55 ◽

Cited By ~ 1

Author(s):

María Fernanda Veloz-Castillo ◽

Antonio Paredes-Arroyo ◽

Gerardo Vallejo-Espinosa ◽

José Francisco Delgado-Jiménez ◽

Jeffery L. Coffer ◽

...

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Carbon Fibers ◽

Carbon Nanostructures ◽

Glass Tube ◽

X Ray Diffraction ◽

Transmission Electron ◽

Multi Walled Carbon Nanotubes ◽

Application Fields ◽

Walled Carbon Nanotubes

The growing interest in nanomaterials in different application fields calls for the implementation of simple, economically appealing, and efficient preparative methods. Among the wide variety of nanomaterials, carbon nanostructures have a special place due to their potential technological applications. Here, we present a fast, cheap, and easy-to-implement microwave-assisted method for the preparation of carbon nanotubes (CNTs) and carbon fibers (CFs) at room pressure conditions. The synthesis involves heating a mixture of graphite and ferrocene contained in a simple glass tube using a conventional microwave oven. A mixture of multi-walled carbon nanotubes (MWCNTs) and Fe3O4 magnetic nanoparticles were obtained quickly (less than 30 s) and in good yields. The products were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and Raman spectroscopy.

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Toxicity determinants of multi-walled carbon nanotubes: The relationship between functionalization and agglomeration

Toxicology Reports ◽

10.1016/j.toxrep.2016.01.011 ◽

2016 ◽

Vol 3 ◽

pp. 230-243 ◽

Cited By ~ 78

Author(s):

Manfredi Allegri ◽

Dimitrios K. Perivoliotis ◽

Massimiliano G. Bianchi ◽

Martina Chiu ◽

Alessandra Pagliaro ◽

...

Keyword(s):

Carbon Nanotubes ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

The Relationship

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Induction of micronuclei by multi-walled carbon nanotubes interacting with humic acids in cultured human lymphocytes

Environmental Science Nano ◽

10.1039/c5en00138b ◽

2016 ◽

Vol 3 (1) ◽

pp. 74-84 ◽

Cited By ~ 2

Author(s):

Maria-Sophia Vidali ◽

Eleni Bletsa ◽

Antonios Kouloumpis ◽

Charalambos G. Skoutelis ◽

Yiannis Deligiannakis ◽

...

Keyword(s):

Carbon Nanotubes ◽

Humic Acid ◽

Humic Acids ◽

Human Lymphocytes ◽

Cytotoxic Effects ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

First Time

Mixtures of multi-walled carbon nanotubes with natural humic acids or humic acid-like polycondensates were evaluated, for the first time, about their potential genotoxic and cytotoxic effects in cultured human lymphocytes.

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MWCNTs as a catalyst in oxy-steam reforming of methanol

RSC Advances ◽

10.1039/c6ra15618e ◽

2016 ◽

Vol 6 (84) ◽

pp. 81408-81413 ◽

Cited By ~ 14

Author(s):

P. Mierczynski ◽

A. Mierczynska ◽

W. Maniukiewicz ◽

T. P. Maniecki ◽

K. Vasilev

Keyword(s):

Carbon Nanotubes ◽

Catalytic Activity ◽

Steam Reforming ◽

Steam Reforming Of Methanol ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

First Time

The catalytic activity of multi-walled carbon nanotubes (MWCNTs) in oxy-steam reforming of methanol (ASRM) was investigated for the first time.

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Carbon Nanotubes Dispersion Assessment in Nanocomposites by Means of a Pulsed Thermographic Approach

Materials ◽

10.3390/ma13245649 ◽

2020 ◽

Vol 13 (24) ◽

pp. 5649

Author(s):

Nicola Montinaro ◽

Mario Fustaino ◽

Antonio Pantano

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Polymer Composites ◽

Reference Sample ◽

Thermal Response ◽

Destructive Testing ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

First Time ◽

Non Destructive

The extensive production of polymer composites reinforced by carbon nanotube is limited by the absence of non-destructive evaluation (NDE) methods capable of assessing product quality to guarantee compliance with specifications. It is well known that the level of dispersion of carbon nanotubes (CNTs) in the polymer matrix is the parameter that, much more than others, can influence their enhancement capabilities. Here an active Infrared Thermography Non Destructive Testing(IR-NDT) inspection, joined with pulsed phase thermography (PPT), were applied for the first time to epoxy-CNT composites to evaluate the level of dispersion of the nanoparticles. The PPT approach was tested on three groups of epoxy nanocomposite samples with different levels of dispersion of the nanoparticles. The phasegrams obtained with the presented technique clearly show clusters, or bundles, of CNTs when present, so a comparison with the reference sample is not necessary to evaluate the quality of the dispersion. Therefore, the new NDE approach can be applied to verify that the expected dispersion levels are met in products made from epoxy and Multi-Walled Carbon Nanotubes (MWCNTs). The mechanisms underlying the effects of the dispersion of carbon nanotube on the thermal response of polymer composites have been identified.

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