What is the unique structural feature of a carbon nanotube that contributes to its exceptional strength ?
Quasi-one-dimensional structure
Quasi-one-dimensional structure option is correct.
A carbon nanotube can be viewed as a sheet of graphene rolled seamlessly into a cylinder of nanometre diameter and micrometre-scale length. Along the tube axis it is essentially unbounded while its circumference is only a few nanometres, so the geometry is quasi-one-dimensional.
Two structural features combine to give the exceptional mechanical strength: every carbon atom is bonded to three neighbours through strong sp2 covalent bonds (one of the strongest bonds in nature), and the seamless cylindrical topology means load applied along the axis is shared uniformly along all these covalent bonds without weak inter-planar interactions to fail first. Measured Young’s modulus is around \(1\,\text{TPa}\) and tensile strengths reach tens of GPa — orders of magnitude above steel per unit mass.
Planar graphene is 2D and lacks the tubular integrity; the “rolling vector” only fixes the chirality (metallic vs. semiconducting) rather than the strength; and CNTs are not close-packed. The quasi-1D cylindrical structure is what confers the strength.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
