scholarly journals Robust, flexible, freestanding and high surface area activated carbon and multi-walled carbon nanotubes composite material with outstanding electrode properties for aqueous-based supercapacitors

2021 ◽  
Author(s):  
Bruno Freitas ◽  
Willian G. Nunes ◽  
Davi Marcelo Soares ◽  
Fernando C. Rufino ◽  
Cássio Murilo Moreira ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
Activated Carbon ◽  
Composite Electrode ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Composite ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Composite Electrode ◽  
Walled Carbon Nanotubes

This novel carbon–carbon composite electrode has superlative electrochemical properties with flexibility, mechanical robustness, and weldability.

Multi-walled carbon nanotubes and activated carbon composite material as electrodes for electrochemical capacitors

2021 ◽  
Vol 33 ◽  
pp. 100738 ◽  
Author(s):  
Rafael Vicentini ◽  
Willian G. Nunes ◽  
Lenon H. da Costa ◽  
Leonardo M. Da Silva ◽  
Bruno Freitas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
Activated Carbon ◽  
Electrochemical Capacitors ◽  
Carbon Composite ◽  
Carbon Composite Material ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Spectrofluorometric determination of L-tryptophan after preconcentration using multi-walled carbon nanotubes

2019 ◽  
Vol 2 (01) ◽  
pp. 43-48 ◽  
Author(s):  
Ehsan Zolfonoun
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase ◽  
High Surface ◽  
High Surface Area ◽  
Spectrofluorometric Determination ◽  
Relative Standard ◽  
Effects Of Ph ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A solid-phase extraction method based on multi-walled carbon nanotubes (MWCNTs) was applied for the preconcentration of L-tryptophan prior to its spectrofluorometric determination. Due to the high surface area of MWCNTs, satisfactory concentration factor and extraction recovery can be achieved with only 10 mg MWCNTs in 5 min. The effects of pH, sorbent amount, eluent type and time on the recovery of the analyte were investigated. Under the optimum conditions, the detection limit for L-tryptophan was 8.9 ng mL−1. The precision of the method, evaluated as the relative standard deviation obtained by analyzing of 10 replicates, was 2.6%. The practical applicability of the developed method was examined using wheat and barley samples.

Effect of Expanded Temperature on Microstructure of Carbon Nanotubes/Expanded Graphite Composites

2013 ◽  
Vol 716 ◽  
pp. 373-378
Author(s):  
Qian Zhang ◽  
Xin Bao Gao ◽  
Tian Peng Li
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
High Temperature ◽  
Carbon Nanotube ◽  
Physical Adsorption ◽  
Expanded Graphite ◽  
Graphite Flake ◽  
Graphite Composite ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Carbon nanotube/expanded graphite composite material was prepared by expanding the mixture of multi-walled carbon nanotubes and expansible graphite under the condition of high temperature. The microstructure and composition was studied by using SEM and XRD. The study shows that the tubular structure of carbon nanotubes in the composite material is changed by high temperature expanding process, and the microstructure is different with different expanding temperature. When the expanding temperature was 900°C, carbon nanotubes transformed, then attached to the surface of expanded graphite flake, so carbon nanotubes and expanding graphite combined strongly; globular carbon nanotubes attached to the surface of expanded graphite flake at the temperature of 700°C, both were combined much more strongly; carbon nanotubes retained the tube structure at the temperature of 500°C, combination was looser due to the simple physical adsorption. The result shows that the choice of expanding temperature has an important effect on microstructure of carbon nanotube/expanded graphite composite material.

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