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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
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Molecular discriminators using single wall carbon nanotubes.

Tamoghna Bhattacharyya1, Anjan Kr Dasgupta, Nihar Ranjan Ray

  • 1Department of Biochemistry, University of Calcutta, Kolkata-700019, India.

Nanotechnology
|September 6, 2012
PubMed
Summary

Single wall carbon nanotubes (SWNTs) interact with lipids at solid interfaces, causing molecular restructuring. Lipid tail structure influences diffusion, enabling SWNTs to discriminate between different amphiphilic molecules.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Single wall carbon nanotubes (SWNTs) possess unique hydrophobic properties.
  • Amphiphilic molecules, such as lipids, have both hydrophobic and hydrophilic regions.
  • Understanding their interactions is crucial for developing new materials and separation techniques.

Purpose of the Study:

  • To investigate the solid-phase interaction between SWNTs and amphiphilic molecules, specifically lipids.
  • To determine how the molecular structure of lipids affects their interaction with SWNTs.
  • To explore the potential of SWNTs for discriminating between different amphiphilic molecules.

Main Methods:

  • Studying the interaction of SWNTs with various amphiphilic probes, including lipids, within a narrow capillary interface.
  • Observing molecular restructuring of lipids upon contact with hydrophobic SWNT interfaces.
  • Analyzing the influence of lipid structure (e.g., linear vs. branched tails) on interface diffusion dynamics.

Main Results:

  • Contact between SWNTs and amphiphilic interfaces induces molecular restructuring of lipids.
  • The diffusion front geometry, rate, and extent are dependent on the lipid's molecular structure.
  • Lipids with linear tails (e.g., lecithin) exhibited greater interface mobility than those with branched tails (e.g., dipalmitoyl phosphatidylcholine).
  • Hydrophobic interactions between the SWNT core and lipid tails were confirmed.

Conclusions:

  • Solid-phase interactions between SWNTs and lipids provide a simple and effective method for discriminating amphiphilic molecules.
  • SWNTs can be utilized as a platform for selective lipid recognition and separation based on their structural properties.