Carbon Nanotubes: Prelims MCQ (001) [IAS-2020]

With reference to Carbon Nanotubes, consider the following statements:

  1. They can be used as carriers of drugs and antigens in the human body.
  2. They can be made into artificial blood capillaries for an injured part of the human body.
  3. They can be used in biochemical sensors.
  4. Carbon nanotubes are biodegradable.

Which of the statements given above are correct?
(a) 1 and 2 only
(b) 2, 3, and 4 only
(c) 1, 3, and 4 only
(d) 1, 2, 3 and 4

Answer: D (1,2,3 and 4)

Carbon nanotubes (CNTs) are cylindrical large molecules consisting of a hexagonal arrangement of hybridized carbon atoms, which may by formed by rolling up a single sheet of graphene (single-walled carbon nanotubes, SWCNTs) or by rolling up multiple sheets of graphene (multiwalled carbon nanotubes, MWCNTs).

Enzymes like peroxidase were found to play an important role in the process of biodegradation of carbon nanotubes. Hence option 4 is correct. NASA has demonstrated the use of carbon nanotube arrays as biosensors. Hence option 3 is also correct.

Carbon nanotubes (CNTs) are characterized by unique chemical and biological properties. CNTs have a large surface area that allows them to attach a wide range of biological substances. In addition, CNTs can be used for biomedical applications such as artificial implants, including structural tissue replacements, that is, artificial blood vessels, or functional devices such as drug delivery matrixes. Hence statements 1 and 2 are correct.

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