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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.

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Encapsulation of Single-Walled Carbon Nanotubes in Microgels

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Encapsulation of single walled carbon nanotubes in microgels l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

Microgels

  • Form of hydrogels

  • Roughly-spherical particles

    • Polymer strands

    • Crosslinking agent


Objective encapsulation of cnts in microgels l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

Result 1: CNTs encapsulated in microgels

Compare with:

Image provided by Georgia Tech Image


Result 2 average radius of resultant microgels decreases with increasing temperature l.jpg

Result 2: Average radius of resultant microgels decreases with increasing temperature


Result 3 addition of crosslinking agent yields different properties l.jpg

Result 3: Addition of crosslinking agent yields different properties

CNTs + BIS

CNTs + BIS

CNTs only

CNTs only


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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 l.jpg

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 l.jpg

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


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