Question

Major problems with the large-scale utilization of carbon nanotubes
(A) synthesis in pure forms
(B) dispersion in solvents
(C) reducing their length
(D) tailoring into a desired orientation

• A. (A), (B), and (D) only
• B. (A), (B), and (C) only
• C. (A), (B), (C), and (D)
• D. (B), (C), and (D) only

Hint:

For carbon nanotubes, achieving purity, proper dispersion, and desired orientation is crucial for effective application in advanced materials and devices.

Answer 1

The Correct Option is C

Step 1: Identifying challenges with carbon nanotubes.
The large-scale use of carbon nanotubes faces several issues:
- (A) Synthesizing carbon nanotubes in pure forms is challenging.
- (B) Dispersion in solvents is difficult due to their strong tendency to clump together.
- (C) Reducing their length is necessary for certain applications but is hard to achieve consistently.
- (D) Tailoring their orientation is essential for specific applications, but this is not always feasible.

Final Answer: \[ \boxed{3. \text{(A), (B), (C), and (D)}} \]