Go Back   Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum > Molecular Research Topics Forum > Basic Lab Protocols and Techniques
Register Search Today's Posts Mark Forums Read


Separation of Single Wall Carbon Nanotubes

Separation of Single Wall Carbon Nanotubes - Basic Lab Protocols and Techniques

Separation of Single Wall Carbon Nanotubes -


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-27-2007, 06:38 AM
Pipette Filler
Points: 1,394, Level: 21 Points: 1,394, Level: 21 Points: 1,394, Level: 21
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Apr 2007
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default Separation of Single Wall Carbon Nanotubes



Size exclusion chromatography (SEC) has been used to separate single wall carbon nanotubes (SWNT) dispersed by chemical modification in organic solvents and by DNA in aqueous solution. The chromatographic detection includes size sensitive detectors, multi-angle light scattering (MALS) and intrinsic viscosity (IV), which can provide information on the size and shape of the SEC fractions. The dispersions were also characterized by small angle neutron scattering (SANS) and atomic force microscopy (AFM). Chemical modification was accomplished by covalent attachment of octadecyl amine to acid treated SWNT and by covalent attachment of butyl groups through free radical grafting. Both covalent attachment methods produced dispersions that contained impurities or clusters of SWNT. The DNA dispersions produced the best dispersions, being predominately single nanotubes.

※Putus Macromolecular Sci. & Tech. Ltd. is an international corporation which has been putting effort in research, development and application of a variety of carbohydrate polymers. We are manufacturing and providing high quality carbohydrate polymer standards such as GPC/SEC standards, with unique structure and high chemical uniformity in terms of molecular weight (Mw) and degree of branching.
Reply With Quote
  #2  
Old 03-04-2009, 05:14 AM
Pipette Filler
Points: 130, Level: 2 Points: 130, Level: 2 Points: 130, Level: 2
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Feb 2009
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
Default Re: Separation of Single Wall Carbon Nanotubes

Hi,
We show that electrostatic charging of nanotubes and the consequent repulsion can lead to reversible separation of individual single-walled carbon nanotubes in bundles. Low-energy electron beam irradiation leads to this completely reversible phenomenon. A simple semianalytical model is used to explain the observed separation mechanism. The reversibility of the separation process is attributed to discharging and thermal-fluctuation induced motion of the nanotubes in ambient air.
Reply With Quote
Reply

Tags
carbon , nanotubes , separation , single , wall


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Chromatographic Separation of Single Wall Carbon Nanotubes cottonsugar Chromatography Forum 0 05-09-2007 09:05 AM
Chromatographic Separation of Single Wall Carbon Nanotubes cottonsugar Basic Lab Protocols and Techniques 0 04-27-2007 04:03 AM
Penn Researchers Introduce a New Nanotube-Laced Gel, Create New Means of Aligning Nanotubes Bubba Do Wah Ditty Physics Forum 0 03-02-2004 06:34 PM
Carbon Nanotubes for Solar Cells... Do Wah Ditty Physics Forum 0 09-15-2003 12:35 PM
Rice University's Chemical 'Scissors' Yield Short Carbon Nanotubes; New Process Yields Nanotubes Small Enough To Migrate Through Cells Do Wah Ditty Physics Forum 0 07-23-2003 12:56 PM


All times are GMT. The time now is 12:25 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 - 2012 Molecular Station | All Rights Reserved
Page generated in 0.12024 seconds with 16 queries