Optimizing the Purification of Biofunctionalized Carbon Nanotubes

2006 ◽  
Author(s):  
M. S. Arnold ◽  
S. I. Stupp ◽  
M. C. Hersam
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Electronics ◽  
Density Gradient Centrifugation ◽  
Gradient Centrifugation ◽  
Physical Structure ◽  
One Dimensional ◽  
Purification Time ◽  
Methods Of Synthesis ◽  
Separation Strategy ◽  
Walled Carbon Nanotubes

The utilization of single-walled carbon nanotubes (SWNTs) in large quantities for molecular electronics, optoelectronics, biosensors, and medical applications will require SWNTs of the same physical structure, electronic type, and band gap. Since current methods of synthesis produce mixtures of nanotubes with different physical structures and electrical properties, the development of strategies for the postproduction separation of these one-dimensional materials is highly desirable. In this work, we demonstrate a scalable method for separating SWNTs by diameter using density gradient centrifugation. Of particular interest for biosensing applications is the bulk purification of SWNTs through centrifugation of DNA wrapped SWNTs in aqueous density gradients. The dependence of this process on DNA sequence and length has been determined. In addition, strategies for decreasing the purification time are outlined. Overall, this nondestructive and scalable separation strategy is expected to impact a variety of applications for SWNTs where monodisperse structure and properties are essential.

Bulk enrichment and separation of multi-walled carbon nanotubes by density gradient centrifugation

Carbon ◽  
2009 ◽  
Vol 47 (6) ◽  
pp. 1608-1610 ◽  
Author(s):  
Xiaoyong Deng ◽  
Dongmei Xiong ◽  
Haifang Wang ◽  
Dandan Chen ◽  
Zheng Jiao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Density Gradient ◽  
Density Gradient Centrifugation ◽  
Gradient Centrifugation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Metastable One-Dimensional AgCl1-xIxSolid-Solution Wurzite “Tunnel” Crystals Formed within Single-Walled Carbon Nanotubes

2002 ◽  
Vol 124 (10) ◽  
pp. 2116-2117 ◽  
Author(s):  
Jeremy Sloan ◽  
Mauricio Terrones ◽  
Stefan Nufer ◽  
Steffi Friedrichs ◽  
Sam R. Bailey ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
One Dimensional ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Image Restoration of One-Dimensional HgTe Crystals Formed within Single Walled Carbon Nanotubes

2006 ◽  
Vol 514-516 ◽  
pp. 1131-1134
Author(s):  
Jeremy Sloan ◽  
Robin Carter ◽  
Angus I. Kirkland ◽  
Rüdiger R. Meyer ◽  
Alexis Vlandas ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Three Dimensional ◽  
Single Walled Carbon Nanotubes ◽  
One Dimensional ◽  
Single Walled Carbon ◽  
Semiconductor Crystals ◽  
Transmission Electron ◽  
Walled Carbon Nanotubes ◽  
Separate Crystal

Restored high resolution transmission electron microscopy (HRTEM) images have been recorded from 1D semiconductor crystals formed within narrow diameter (ca. 1.4 nm) single walled carbon nanotubes (SWNTs). Two unique projections were obtained from separate crystal fragments encapsulated within separate nanotubes that has facilitated the reconstruction of the three dimensional arrangement of atoms within the two encapsulated fragments.

Suction Energy for Double-Stranded DNA Inside Single-Walled Carbon Nanotubes

2017 ◽  
Vol 70 (4) ◽  
pp. 387-400 ◽  
Author(s):  
Mansoor H Alshehri ◽  
James M Hill
Keyword(s):  
Carbon Nanotubes ◽  
Mathematical Modelling ◽  
Molecular Electronics ◽  
Continuum Approximation ◽  
Suction Force ◽  
Dsdna Molecule ◽  
Double Stranded Dna ◽  
Modelling Techniques ◽  
Dynamics Simulations ◽  
Walled Carbon Nanotubes

Summary Deoxyribonucleic acid (DNA) and carbon nanotubes (CNTs) constitute hybrid materials with the potential to provide new components with many applications in various technology areas, such as molecular electronics, field devices and medical applications. Using classical applied mathematical modelling, we investigate the suction force experienced by a double-stranded DNA (dsDNA) molecule which is assumed to be located on the axis near an open end of a semi-infinite single-walled CNT. We employ both the 6-12 Lennard-Jones potential and the continuum approximation, which assumes that a discrete atomic structure can be replaced by a surface with constant average atomic density. While most research in the area is dominated by molecular dynamics simulations, here we use elementary mechanical principles and classical applied mathematical modelling techniques to formulate explicit analytical criteria and ideal model behaviour. We observe that the suction behaviour depends on the radius of the CNT, and we predict that it is less likely for a dsDNA molecule to be accepted into the CNT when the value of the tube radius is ${<}12.9$ Å. The dsDNA molecule will be accepted into the CNT for radii lager than 13 Å, and we show that the optimal single-walled CNT necessary to fully enclose the DNA molecule has a radius of 13.56 Å, which approximately corresponds to the chiral vector numbers (20, 20). This means that the ideal single-walled CNT to be used to encapsulate a dsDNA is (20, 20) which has the required radius of 13.56 Å.

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