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Search Publications by: Ming Zheng (Fed)

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Displaying 76 - 99 of 99

Analyzing Surfactant Structures on Length and Chirality Resolved (6,5) Single-Wall Carbon Nanotubes by Analytical Ultracentrifugation

March 26, 2013
Author(s)
Jeffrey A. Fagan, Ming Zheng, Jeffrey R. Simpson, Vinayak Rastogi, Constantine Y. Khripin, Carlos A. Silvera Batista, Angela R. Hight Walker
The structure and density of the bound interfacial surfactant layer and associated hydration shell were investigated using analytical ultracentrifugation for length and chirality purified (6,5) single-wall carbon nanotubes (SWCNTs) in three different bile

High Resolution Length Fractionation of Surfactant Dispersed Carbon Nanotubes

December 23, 2012
Author(s)
Constantine Y. Khripin, Xiaomin X. Tu, Jeffrey A. Fagan, Ming Zheng
Length fractionation of colloidal carbon nanotube dispersions is required for many studies. Size- exclusion chromatography (SEC) has been reported as a reliable method for high resolution length fractionation of DNA-dispersed single-wall carbon nanotubes

Chirality-controlled cloning of carbon nanotubes

November 13, 2012
Author(s)
Ming Zheng, Xiaomin X. Tu, Jia Liu, Chuan Wang, Chongwu Zhou
Carbon nanotubes possess superior electrical and optical properties and hold great promise for electronic and biomedical applications1-10. The electronic properties of carbon nanotubes strongly depend on their chirality, with 1/3 being metallic1, 2/3 being

Concentration Measurement of Length-Fractionated Colloidal Single-Wall Carbon Nanotubes

September 20, 2012
Author(s)
Constantine Y. Khripin, Xiaomin X. Tu, John Howarter, Jeffrey A. Fagan, Ming Zheng
Determination of the colloid concentration for a given single-wall carbon nanotube (SWCNT) dispersion is a basic requirement for many studies. The commonly used optical absorption based concentration measurement is complicated by the spectral change due to

Measuring Single-Walled Carbon Nanotube Length Distributions from Diffusional Trajectories

August 27, 2012
Author(s)
Jason Streit, Sergei M. Bachilo, Anton V. Naumov, Constantine Y. Khripin, Ming Zheng, R B. Weisman
A new method is demonstrated for measuring the length distributions of dispersed single-walled carbon nanotube (SWCNT) samples by analyzing diffusional motions of many individual nanotubes in parallel. In this method, termed Length Analysis by Nanotube

Violation of the Condon Approximation in Semiconducting Carbon Nanotubes

June 28, 2011
Author(s)
Ming Zheng
A long-held but untested fundamental assumption in Raman spectroscopy of carbon nanotubes is that intensities arising from resonance with incident and scattered photons are equal. We present here the first complete Raman excitation profiles (REPs) for the