scholarly journals Diazonium Electrografting vs . Physical Adsorption of Azure A at Carbon Nanotubes for Mediated Glucose Oxidation with FAD‐GDH

2020 ◽  
Vol 7 (22) ◽  
pp. 4543-4549
Author(s):  
Andrew J. Gross ◽  
Shunya Tanaka ◽  
Clara Colomies ◽  
Fabien Giroud ◽  
Yuta Nishina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glucose Oxidation ◽  
Physical Adsorption ◽  
Azure A

scholarly journals Cover Feature: Diazonium Electrografting vs . Physical Adsorption of Azure A at Carbon Nanotubes for Mediated Glucose Oxidation with FAD‐GDH (ChemElectroChem 22/2020)

2020 ◽  
Vol 7 (22) ◽  
pp. 4503-4503
Author(s):  
Andrew J. Gross ◽  
Shunya Tanaka ◽  
Clara Colomies ◽  
Fabien Giroud ◽  
Yuta Nishina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glucose Oxidation ◽  
Physical Adsorption ◽  
Azure A

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.

The adsorption of divalent heavy metal ions on (8,0) carbon nanotubes: The first-principles study

2020 ◽  
Vol 34 (32) ◽  
pp. 2050368
Author(s):  
Z. Zhu ◽  
L. An ◽  
T. Chen ◽  
X. Jia
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
First Principles ◽  
Industrial Wastewater ◽  
Heavy Metal Ions ◽  
Density Functional ◽  
Physical Adsorption ◽  
Functional Theory ◽  
Sensing Material

In order to explore new ways to detect and remove heavy metal ions from industrial wastewater, the first-principles method based on density functional theory has been used to investigate the performance of carbon nanotubes (CNTs) in adsorbing divalent heavy metal ions which include Zn[Formula: see text], Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text]. Results show that the adsorption of Zn[Formula: see text] on CNTs is weak and only physical adsorption forms between them. However, for Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text], the final adsorption distance with CNTs is greatly decreased, and the adsorption energy and charge transfer amount with CNTs are significantly increased. In addition, the charge density of Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text] overlaps effectively with that of CNTs. These indicate the formation of strong chemisorption between these ions and CNTs. Therefore, CNTs could be used as a sensing material to detect and remove Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text] from wastewater. The research provides theoretical guidance for the application of CNTs in heavy metal ions treatment.

Using multi-walled carbon nanotubes to enhance coimmobilization of poly(azure A) and poly(neutral red) for determination of nicotinamide adenine dinucleotide and hydrogen peroxide

RSC Advances ◽  
2014 ◽  
Vol 4 (85) ◽  
pp. 45566-45574 ◽  
Author(s):  
Kuo Chiang Lin ◽  
A. T. Ezhil Vilian ◽  
Shen Ming Chen
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Peroxide ◽  
Nicotinamide Adenine Dinucleotide ◽  
Neutral Red ◽  
Nicotinamide Adenine ◽  
Hybrid Films ◽  
Azure A ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Illustration of electro-codeposition of azure A and neutral red hybrid films using high ly conductive and steric MWCNTs as a template.

Ferric ion adsorption and electrodesorption by carbon nanotubes and nanofibres films

2009 ◽  
Vol 59 (8) ◽  
pp. 1657-1663 ◽  
Author(s):  
Haibo Li ◽  
Likun Pan ◽  
Yanping Zhang ◽  
Zhuo Sun
Keyword(s):  
Carbon Nanotubes ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Chemical Vapor ◽  
Ion Adsorption ◽  
Order Model ◽  
First Order ◽  
Monolayer Adsorption ◽  
Pressure Chemical ◽  
Kinetics And Isotherms

Carbon nanotubes and nanofibres (CNTs-CNFs) films have been grown on Ni sheets by low pressure chemical vapor deposition system and show good physical adsorption capability for ferric (Fe3 + ) ions. The studies of adsorption kinetics and isotherms indicate that Fe3 +  adsorption process was regarded as first-order model and followed a Langmuir isotherm indicating monolayer adsorption. The saturated CNTs-CNFs film is easy to be regenerated by electrodesorption with direct voltage applied. The result shows that the combination of adsorption and electrodesorption by CNTs-CNFs is a promising technology to remove the Fe3 +  contamination in solution, which can be further extended to the process of other heavy metal ions.

Preparation of Multi-Walled Carbon Nanotubes (MWNTs)/Polymethyl Methacrylate (PMMA) Hybrid Membranes and their Sorption Performance of Benzene/Cyclohexane

2013 ◽  
Vol 740 ◽  
pp. 550-554
Author(s):  
Li Guang Wu ◽  
Yu Fei Chen ◽  
Yang Rong ◽  
Ting Wang ◽  
Yu Xing Wang
Keyword(s):  
Carbon Nanotubes ◽  
Polymethyl Methacrylate ◽  
Physical Adsorption ◽  
Separation Performance ◽  
Polar Group ◽  
Hybrid Membranes ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Effect Of Surface

Novel organic-inorganic hybrid membranes of polymethyl methacrylate (PMMA) containing multi-walled carbon nanotubes (MWNTs) were successfully prepared. Then, the swelling adsorption experiments of benzene/cyclohexane mixtures were employed to evaluate the performance of these membranes. Via transmission electron microscopy (TEM), Fourier transform infrared spectrophotometry (FTIR), the effect of surface modification on the morphology and properties of carbon nanotubes and hybrid membranes were studied. The results indicated that the separation performance for benzene/cyclohexane of the hybrid membranes depended on both the polarity of carbon nanotubes and the distribution of MWNTs in PMMA. Because the dispersion of MWNTs were obviously improved after acidification and ammonization modification, the hybrid membranes including modified MWNTs showed higher performance than membranes with un-modified MWNTs. In addition, a large number of polar group were introduced in the MWNTs during modification of acidification and ammonization, which depressed obviously the physical adsorption of cyclohexane by MWNTs. Therefore, these two changes in the properties of MWNTs both improved the separation performance of hybrid membranes.

scholarly journals Chemi- vs physisorption in the radical functionalization of single-walled carbon nanotubes under microwaves

2014 ◽  
Vol 5 ◽  
pp. 537-545 ◽  
Author(s):  
Victor Mamane ◽  
Guillaume Mercier ◽  
Junidah Abdul Shukor ◽  
Jérôme Gleize ◽  
Aziz Azizan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Functional Groups ◽  
Physical Adsorption ◽  
Reaction Times ◽  
Single Walled Carbon Nanotubes ◽  
Chemical Mechanisms ◽  
Single Walled Carbon ◽  
Chemical Grafting ◽  
Grafting From ◽  
Walled Carbon Nanotubes

The effect of microwaves on the functionalization of single-walled carbon nanotubes (SWNTs) by the diazonium method was studied. The usage of a new approach led to the identification of the strength of the interaction (physical or chemical) between the functional groups and the carbon nanotube surface. Moreover, the nature (chemical formula) of the adsorbed/grafted functional groups was determined. According to thermogravimetric analysis coupled with mass spectrometry and Raman spectroscopy, the optimal functionalization level was reached after 5 min of reaction. Prolonged reaction times can lead to undesired reactions such as defunctionalization, solvent addition and polymerization of the grafted functions. The strength (chemi- vs physisorption) of the bonds between the grafted functional groups and the SWNTs is discussed showing the occurrence of physical adsorption as a consequence of defunctionalization after 15 min of reaction under microwaves. Several chemical mechanisms of grafting could be identified, and it was possible to distinguish conditions leading to the desired chemical grafting from those leading to undesired reactions such as physisorption and polymerization.

Comparison of Glucose Oxidation by Crosslinked Redox Polymer Enzyme Electrodes Containing Carbon Nanotubes and a Range of Glucose Oxidising Enzymes

2012 ◽  
Vol 25 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Domhnall MacAodha ◽  
Peter Ó Conghaile ◽  
Brenda Egan ◽  
Paul Kavanagh ◽  
Christoph Sygmund ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glucose Oxidation ◽  
Redox Polymer ◽  
Enzyme Electrodes
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