This set of Multiple Choice Questions & Answers (MCQs) focuses on “Nanomaterials – Set 8”.
1. Core and shell structures of a nanoparticle mostly has same ______
a) Composition
b) Physical property
c) Crystal structure
d) Chemical property
View Answer
Explanation: Core and shell structures can be made of different molecules or ions so they have different composition, this difference in composition leads to different chemical reactivity and physical properties as shell surrounds the core. Shell grows on core structure by matching its lattice parameters so crystal structure is same.
2. Zeolites are __________
a) Lead-silicates
b) Aluminium-silicates
c) Ferrous-silicates
d) Zinc-silicates
View Answer
Explanation: Zeolites are the compounds of aluminium and silica, actually there are tetra-aluminium silicates. In silicates, when some silicon atoms are replaced by aluminium, cavities and pores are formed in the structure due to some vacant places in structure, to maintain the electrical neutrality.
3. Zeolites are suitable for ________
a) Structure controlled growth
b) Surface controlled growth
c) Diffusion controlled growth
d) Sol-gel synthesis
View Answer
Explanation: Zeolites have a unique pore size based on the composition, this pore size can give different structures to nanomaterials. Zeolites are also used as templates in template based synthesis.
4. Some core shell nanoparticles are used for the treatment of hypothermia, which one is it?
a) Strontium ferrites
b) Zeolites
c) Carbon nanotubes
d) Aerogels
View Answer
Explanation: For treatment of hypothermia magnetic nanoparticles are suitable and core shell magnetic nanoparticles are best suited. Strontium ferrites are the only magnetic particles among them and they have core shell structure too. These particles oscillate with RF fields and thus produces heat.
5. Core shell structures have different composition in core and shell.
a) True
b) False
View Answer
Explanation: Core and shell structures have different entities so they have different composition, they also have different chemical reactivity and physical properties as shell surrounds the core. Shell grows on core structure by matching its lattice parameters so crystal structure is same. Shell sometimes also stabilizes the nanoparticles.
Sanfoundry Global Education & Learning Series – Nanomaterials.
To practice all areas of Nanomaterials, here is complete set of Multiple Choice Questions and Answers.
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