encapsulation of single walled carbon nanotubes in microgels
Download
Skip this Video
Download Presentation
Encapsulation of Single-Walled Carbon Nanotubes in Microgels

Loading in 2 Seconds...

play fullscreen
1 / 16

Encapsulation of Single-Walled Carbon Nanotubes in Microgels - PowerPoint PPT Presentation


  • 203 Views
  • Uploaded on

Encapsulation of Single-Walled Carbon Nanotubes in Microgels. Amelia Lin Texas Academy of Mathematics and Science Mentor: Dr. Zhibing Hu UNT Department of Physics. Microgels Image provided by Georgia Tech Image. Carbon nanotubes.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Encapsulation of Single-Walled Carbon Nanotubes in Microgels' - ros


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
encapsulation of single walled carbon nanotubes in microgels

Encapsulation of Single-Walled Carbon Nanotubes in Microgels

Amelia LinTexas Academy of Mathematics and Science

Mentor: Dr. Zhibing Hu

UNT Department of Physics

MicrogelsImage provided by Georgia Tech Image

carbon nanotubes
Carbon nanotubes
  • Essentially a sheet of graphite rolled up into a tube and capped at the ends with fullerene halves
  • Extensive range of unique physical and chemical properties
  • Applications span across fields including physics, chemistry, and materials science

Image provided by Saito Laboratory, Nagoya University

problems with biological applications
Problems with biological applications
  • Carbon nanotubes are cytotoxic, or toxic to cells, curtailing developments in biomedicine and biotechnology
    • Biosensors
    • Drug delivery agents
    • Selective cancer cell destruction
smart hydrogels
Smart hydrogels
  • Hydrogels: macromolecular networks that can retain a high percentage of water within their structure
  • Smart hydrogels: hydrogels that respond to environmental stimuli
  • Biocompatible
microgels
Microgels
  • Form of hydrogels
  • Roughly-spherical particles
    • Polymer strands
    • Crosslinking agent
objective encapsulation of cnts in microgels
Objective – encapsulation of CNTs in microgels
  • Encapsulate CNTs in a biocompatible material
  • Applications in biomedicine and biotechnology
    • Biosensors
    • Drug delivery agents
    • Selective cancer cell destruction
methodology
Methodology

Part 1: Functionalize carbon nanotubes (CNTs) to have the same end structure as the crosslinking agent

Part 2: Substitute functionalized CNTs for the crosslinking agent

methodology part 1
Methodology – Part 1

BIS (crosslinking agent)

Part 1: Match end structure

  • PNIPAAm* microgels
    • Thermo-responsive, smart hydrogel
    • BIS* crosslinking agent

* Poly(N-isopropylacrylamide (PNIPAAm)

N-isopropylacrylamide (NIPA)

N, N’-Methylene-bis-acrylamide (BIS)

methodology part 19
Methodology – Part 1

Treat with nitric and sulfuric acid

Part 1: Match end structure

React with NMH* and EDC*

*N-(3-Aminopropyl)methacrylamide hydrochloride (NMH)

N-(3-dimethylaminopropyl)-N\'-ethylcarbodiimide hydrochloride (EDC)

slide10

Methodology – Part 2

Part 2: Synthesize microgels using functionalized CNTs

Functionalized CNTs

+

Conventional microgel synthesis at 70°C

CNTs encapsulated in microgel

NIPA* monomer

*N-isopropylacrylamide (NIPA)

result 1 cnts encapsulated in microgels
Result 1: CNTs encapsulated in microgels

Compare with:

Image provided by Georgia Tech Image

result 3 addition of crosslinking agent yields different properties
Result 3: Addition of crosslinking agent yields different properties

CNTs + BIS

CNTs + BIS

CNTs only

CNTs only

conclusions
Conclusions
  • Successful encapsulation
    • Introduction of CNTs into the human body
    • Applications in biomedicine and biotechnology
    • Biosensors
    • Drug delivery agents
    • Selective cancer cell destruction
  • Integration with a material that already has applications
  • Novel method for substituting crosslinking agent in microgels
future directions
Future Directions
  • Elucidation of physical and chemical properties of resultant microgels
    • Transmission electron microscopy
    • Scanning electron microscopy
    • Infrared and nuclear magnetic resonance spectroscopy
  • Investigation of unexpected results

- Possible encapsulation of individual nanotubes

  • Encapsulation of other nanoscale materials Application of method to other materials
    • Quantum dots
acknowledgements
Acknowledgements
  • Prof. Zhibing Hu, for his time and guidance
  • Dr. Tong Cai, for his invaluable help and inexhaustible patience
  • Dr. Richard Sinclair and Dr. John Ed Allen, for their sponsorship of my work
  • Dr. Ray Baughman, for first opening his lab door to me in 2004 and for the inspiration and support since then
  • CollegeBoard and the Siemens Foundation, for hosting and making this event possible
ad