composites of single wall carbon nanotubes and polymer latice of styrene by israel chavez sumarriva...
TRANSCRIPT
Composites of Single wall Carbon nanotubes and
Polymer latice of Styrene
By Israel Chavez Sumarriva
Fundamentals of Nanotechnology, Chem E 5480 December 1st, 2007
Review Paper Presentation
Background and IntroductionBackground and Introduction
In 1991, Iijima discovered carbon nanotubes with the exceptional properties such as excellent mechanical strength and optical properties, high electrical and thermal conductivities.
Single Wall Carbon-NanotubesSingle Wall Carbon-Nanotubes
- Reported results: Young’s modulus ~ 1000 GPa (100x Kevlar, tensile strength ~ 30 GPa (10x Kevlar)- Can be conductive or semiconductive- High thermal conductivity (10x copper)- Disperse SWNTs in polymers using a dispersing
agent
http://www.nanotech-now.com/images
Surfactants can disperse SWNTs in aqueous solution without forming chemical bonds with the tubes not affect the tube properties.
Emulsion
Are systems in which liquid droplets (discontinuous phase) are dispersed in an immiscible liquid (continuous phase). However, for the system to be stable enough to be called an “emulsion” , the emulsifying agent, which usually is a surface active agent, must be present.
Emulsion polymerization
Micro Mini Macro
Common method to encapsulate inorganic particles
< 100 nm 100 – 500 nm > 500 nm
SWNT dispersed in surfactant
Latex (product of macro or miniemulsion)
Mixing dispersed components
Procedure of mixing methodSWNTs
SDBS solutionsonication
Stir 20 minLatex
(product of (mini)emulsion polymerization)
Evaporate water
SolidSoxhlet extraction of SDBS using propanol
120 h
Sample
CompressionMolding
Procedure of mixing methodSWNTs
SDBS solutionsonication
Stir 20 minLatex
(product of (mini)emulsion polymerization)
Evaporate water
SolidSoxhlet extraction of SDBS using propanol
120 h
Sample
CompressionMolding
Procedure of mixing methodSWNTs
SDBS solutionsonication
Stir 20 minLatex
(product of (mini)emulsion polymerization)
Evaporate water
SolidSoxhlet extraction of SDBS using propanol
120 h
Sample
CompressionMolding
Procedure of mixing methodSWNTs
SDBS solutionsonication
Stir 20 minLatex
(product of (mini)emulsion polymerization)
Evaporate water
SolidSoxhlet extraction of SDBS using propanol
120 h
Sample
CompressionMolding
Procedure of mixing methodSWNTs
SDBS solutionsonication
Stir 20 minLatex
(product of (mini)emulsion polymerization)
Evaporate water
SolidSoxhlet extraction of SDBS using propanol
120 h
Sample
CompressionMolding
Future Directions:
Well. If we want to make this process as industrial scale, We need to change the extraction of SDBS by Soxhlet because soxhlet process is not practical a big scale with another process. I’m working using membranes instead of Soxhlet
GRACIAS
THANK YOU
GRACIAS
THANK YOU