Various surfactants for classification and separation of multilayer carbon nanotubes (SWCNTs) based on PhD in nano-microelectronics (PhD in education and research)
Researcher and author: Dr. ( Afshin Rashid)
Note: Different surfactants have been used to classify and separate SWCNTs multilayer nanotubes based on chirality . Selective separation of SWCNTs is performed using added salt SDS solution . The diameter- dependent and chiral bonding applies to general surfactants (sodium diclofenac sulfate 10), (sodium dicyl benzene 11) sulfonate, and (sodium covalent 12) in aqueous solution.
Octadecylamine selectively interacts with semiconductor SWCNTs , provided the SWCNTs are oxidized. On the contrary, the use of propyl amines Vayzv propyl amines in THF, selective adsorption on metallic SWNTs do not. This causes the solution to condense from the metal nanotubes. Different colors of nanotube suspensions are observed, indicating the high purity of specific types of SWCNTs. Amines can also be attached to SWCNTs via covalent bonding , but in this case there is no selectivity for metal or semiconductor SWCNTs .
Carbon nanotubes (SWCNTs) are large cylindrical molecules consisting of a hexagonal arrangement of hybrid carbon atoms that may form by forming a single graphene sheet (single-walled carbon nanotubes, SWCNTs) or by assembling several sheets of graphene (multiple). Be formed. Nanotube layers can behave like a metal and be electrically angled. Structure and structure changes in them can display semiconductor properties. Or be non-conducting. For example, a slight change in the helical section can turn the pipe from a metal to a semiconductor with a large gap.SWCNTs carbon nanotubes are hollow cylinders composed of carbon atoms in a hexagonal structure. Two common zigzag and armature structures with multiple geometric and behavioral characteristics to evaluate the effect of structure type on changes in mechanical properties, the most important of which is the modulus of elasticity. The behavior of covalent bonds between carbon atoms is assumed by assuming bending elements with modulus of elasticity and a certain Poisson's ratio and applying a net tensile load to its upper surface to calculate the amount of modulus of elasticity of the structures under study. According to studies, the armature structure has a higher modulus of elasticity compared to zigzag specimens. The helical complexity (mono-no-Falotine Falvin) on nanotubes is very interesting. This substance can Selectively separate 85% of nanotubes (6,8) from a wide diameter nanotube sample.
Author: Dr. ( Afshin Rashid)