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Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...

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Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes
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Nicotine adsorption on single wall carbon nanotubes.

Eduardo C Girão1, Solange B Fagan2, Ivana Zanella2

  • 1Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-900 Fortaleza, Ceará, Brazil.

Journal of Hazardous Materials
|September 28, 2010
PubMed
Summary

This study shows nicotine favorably adsorbs onto single-wall carbon nanotubes (SWCNTs). The interaction involves nicotine's nitrogen atom, suggesting potential chemical bonding with SWCNTs.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Single-wall carbon nanotubes (SWCNTs) are extensively studied for their unique electronic and mechanical properties.
  • Understanding molecular interactions with SWCNTs is crucial for developing novel applications in sensing and drug delivery.

Purpose of the Study:

  • To theoretically investigate the adsorption behavior of nicotine molecules on pristine and defective (8,0) SWCNTs.
  • To analyze the interaction mechanism and energetic favorability of nicotine-SWCNT systems.

Main Methods:

  • Ab initio calculations using density functional theory (DFT).
  • Analysis of total energy curves for different nicotine adsorption sites on SWCNTs.

Main Results:

  • Nicotine adsorption on SWCNTs is energetically favorable.
  • The interaction is primarily mediated by the tri-coordinated nitrogen atom of nicotine.
  • Potential for chemical bonding between nicotine and SWCNTs via the di-coordinated nitrogen is predicted.

Conclusions:

  • Nicotine can effectively interact with SWCNTs through favorable adsorption.
  • The nitrogen atom in nicotine plays a key role in the molecule-nanotube interaction.
  • These findings suggest potential applications in areas like nicotine detection or functionalized SWCNT materials.