Novel carboxylation treatment and characterization of multiwalled carbon nanotubes for simultaneous sensitive determination of adenine and guanine in DNA

2010 ◽  
Vol 169 (1-2) ◽  
pp. 33-40 ◽  
Author(s):  
Xinman Tu ◽  
Xubiao Luo ◽  
Shenglian Luo ◽  
Liushui Yan ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Sensitive Determination

Determination of Traces of Iron and Lead in Food and Water Samples After Preconcentration on Multiwalled Carbon Nanotubes

2012 ◽  
Vol 95 (4) ◽  
pp. 1183-1188 ◽  
Author(s):  
Mustafa Soylak ◽  
Yunus Emre Unsal
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Certified Reference Materials ◽  
Absorption Spectrometry ◽  
Multiwalled Carbon ◽  
Spectrometry Analysis ◽  
Flame Atomic Absorption ◽  
Sensitive Determination ◽  
Humber River

Abstract A new method using multiwalled carbon nanotubes as an SPE adsorbent was developed for the sensitive determination of trace iron and lead prior to flame atomic absorption spectrometry analysis. Iron and lead as 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline chelates were adsorbed quantitatively on multiwalled carbon nanotubes at a pH of 6.0 and easily eluted with 10 mL 1 M HNO3. The influences of matrix ions were also examined. The LOD values for iron and lead were calculated as 1.3 and 2.9 μg/L, respectively. Validation of the presented procedure was performed by the analysis of TMDA 54.4 fortified lake water and HR-1 Humber River sediment certified reference materials. The method was successfully applied to the determination of trace iron and lead in real environmental samples, and excellent results were achieved.

scholarly journals Magnetic multiwalled carbon nanotubes as nanocarrier tags for sensitive determination of fetuin in saliva

2018 ◽  
Vol 113 ◽  
pp. 88-94 ◽  
Author(s):  
Esther Sánchez-Tirado ◽  
Araceli González-Cortés ◽  
Paloma Yáñez-Sedeño ◽  
José M. Pingarrón
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Sensitive Determination ◽  
Magnetic Multiwalled Carbon Nanotubes

scholarly journals Mechanical Characterization of Multiwalled Carbon Nanotubes: Numerical Simulation Study

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4283 ◽  
Author(s):  
Nataliya A. Sakharova ◽  
André F. G. Pereira ◽  
Jorge M. Antunes ◽  
José V. Fernandes
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Mechanical Characterization ◽  
Element Model ◽  
Van Der Waals Interactions ◽  
Multiwalled Carbon ◽  
Shear Moduli ◽  
Simplified Finite Element Model

The elastic properties of armchair and zigzag multiwalled carbon nanotubes were investigated under tensile, bending, and torsion loading conditions. A simplified finite element model of the multiwalled carbon nanotubes, without taking into account the van der Waals interactions between layers, was used to assess their tensile, bending, and torsional rigidities and, subsequently, Young’s and shear moduli. Relationships between the tensile rigidity and the squares of the diameters of the outer and inner layers in multiwalled carbon nanotubes, and between the bending and torsional rigidities with the fourth powers of the diameters of the outer and inner layers, were established. These relationships result in two consistent methods, one for assessment to the Young’s modulus of armchair and zigzag multiwalled carbon nanotubes, based on tensile and bending rigidities, and the other to evaluate shear modulus using tensile, bending, and torsional rigidities. This study provides a benchmark regarding the determination of the mechanical properties of nonchiral multiwalled carbon nanotubes by nanoscale continuum modeling approach.

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