Effect of primary particle size on colloidal stability of multiwall carbon nanotubes

Multiwall carbon nanotubes (MWCNTs) are one type of nanoparticles that have various special properties and potential applications. Due to their increasing production and potential toxicological effects, the environmental behavior and transport of MWCNTs have become important research topics. Particle size is one of the important properties of nanoparticles, yet its effects on MWCNT environmental behaviors have not been fully investigated. In this study, we tested how the length of MWCNTs influenced their settling in the presence of Na+ and/or natural organic matter (NOM), and postulated the governing mechanisms. The results showed that when adding Na+ the shorter MWCNTs exhibited preferential aggregation and settling. One possible reason could be that shorter MWCNTs possess larger specific surface area and consequently stronger attraction forces. However, NOM strongly mitigated such aggregation, and helps to disperse MWCNTs regardless of their length and aqueous conditions.

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New physical insights into the electromagnetic shielding efficiency in PVDF nanocomposites containing multiwall carbon nanotubes and magnetic nanoparticles

RSC Advances ◽

10.1039/c5ra13901e ◽

2015 ◽

Vol 5 (97) ◽

pp. 79463-79472 ◽

Cited By ~ 17

Author(s):

Viraj Bhingardive ◽

Satyam Suwas ◽

Suryasarathi Bose

Keyword(s):

Carbon Nanotubes ◽

Particle Size ◽

Magnetic Nanoparticles ◽

Multiwall Carbon Nanotubes ◽

Electromagnetic Shielding ◽

Polymeric Nanocomposites ◽

Multiwall Carbon

This work attempts to bring critical insights into the electromagnetic shielding efficiency in polymeric nanocomposites with respect to the particle size of magnetic nanoparticles added along with or without a conductive inclusion.

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Dispersion of Multiwall Carbon Nanotubes in Organic Solvents through Hydrothermal Supercritical Condition

Journal of Nanomaterials ◽

10.1155/2015/381275 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 13

Author(s):

Krishnegowda Jagadish ◽

Shivanna Srikantaswamy ◽

Kullaiah Byrappa ◽

Lingaraju Shruthi ◽

Mavinakere Ramesh Abhilash

Keyword(s):

Carbon Nanotubes ◽

Particle Size ◽

Carbon Nanotube ◽

Organic Solvents ◽

Isopropyl Alcohol ◽

Hydrothermal Reaction ◽

Multiwall Carbon Nanotubes ◽

Binding Energies ◽

Multiwall Carbon Nanotube ◽

Multiwall Carbon

Multiwall carbon nanotube (MWCNT) composite materials require careful formulation of processing methods to ultimately realize the desired properties. Until now, controlled dispersion of MWCNT remains a challenge, due to strong van der Waals binding energies associated with the MWCNT aggregates. In the present study, an effort has been made to disperse MWCNTs in organic solvents like dichloromethane, ethanol, isopropyl alcohol, and hexane through hydrothermal reaction. Dichloromethane is considered the best solvent for the dispersion of MWCNTs. The characterizations were carried out to find the dispersion design, particle size, and stabilization, which clearly indicate that the desired properties of MWCNTs have been achieved.

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Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

10.26434/chemrxiv.6652955.v1 ◽

2018 ◽

Author(s):

Gen Hayase

Keyword(s):

Carbon Nanotubes ◽

Aspect Ratio ◽

Aqueous Solutions ◽

High Aspect Ratio ◽

Multiwall Carbon Nanotubes ◽

Multiwall Carbon ◽

Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

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