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WorksheetsJCT Nanomaterials
Total questions: 40
Worksheet time: 24mins
Why the properties of nanomaterials are different significantly compared to bulk materials?
Increased relative surface area
Decreased relative surface area
Increased lattice parameters
Lower down the melting temperature
Why the properties of nanomaterials are different significantly compared to bulk materials?
Quantum effect
Confinement effect
Synergistic effect
Avalanche effect
Nanomaterials may exhibit different properties compare to bulk except;
Reduced lattice constants
band gap broadening
exhibit catalytic properties
Increasing melting temperature
1. Monolithic are considered as zero-dimensional (0-D) nanomaterials
Yes
No
Nanoflakes are considered as Three-dimensional (3-D) nanomaterials
Yes
No
Nanocoatings are considered as Three-dimensional (3-D) nanomaterials
Yes
No
Please list down two general approaches on processing and fabrication of nanomaterials
Top-up
Top-down
Bottom-up
Bottom-down
Nanotubes are considered as Two-dimensional (2-D) nanomaterials
Yes
No
The term allotropes describes
Two atoms of the same element with different mass numbers
Different forms of the same element in which the atoms combine in different ways
the term for the arrangement/structure of carbon atoms which is formed from combustion of wood or other plant matter
the process by which a substance goes directly from the solid phase to the gaseous phase, without passing through the liquid phase
The two types of bonding in graphite are
Covalent and ionic
Metallic covalent
Ionic and metallic
Covalent and dispersion
Fog
solution
Suspension
Colloid
alloy
sand in water
solution
colloid
suspension
alloy
Sunscreen
solution
colloid
suspension
Alloy
Which one is not a colloid?
In this beaker there is some sand floating in water, but most of the sand has settled at the bottom. This would be best described as
A solution
A colloid
A suspension
A compound
A colloid that consists of liquid dispersed in solid.
(a)
It is a suspension of liquid or solid particles in gas?
(a)
Solvent: A substance that (a) another substance
(a) : A substance that dissolves
Solution: A (a) made up of a solvent with a solute dissolved in it.
Insoluble: A (a) that doesn't dissolve
(a) : A cloudy liquid containing insoluble particles.
(a) : type of mixture that always looks cloudy because clumps of insoluble particles remain suspended throughout it – they don’t settle as sediment
Emulsion: a (a) of two or more liquids
Which one is not a colloid
Foam
Gel
Emulsion
Coffee
In a ______________, one substance is dissolved in another substance.
solution
suspension
colloid
Which of the following appear to be clear (are not cloudy)?
Solution
Suspension
Colloid
Which substance is MOST soluble at 0 ºC?
KCI
NaNO3
NaCl
Ce2(SO4)3
A colloidal system having a solid substance as the dispersed phase and a liquid as the dispersion medium.
Identify the colloidal type that best describes the system above.
Gel
Emulsion
Solid Sol
Sol
Select the FALSE statement about adsorption.
The value of adsorption enthalpy of physical adsorption is less than chemical adsorption.
Physical adsorption occurs due to Van der Waals'forces.
Chemical adsorption decreases at high temperature and low pressure.
Physical adsorption is reversible.
Identify the property of colloid related to Tyndall effect.
Mechanical property
Colligative property
Optical property
Electrical property
In sputtering, what determines the colour of the plasma?
The target material
The substrate
The process gas
All of the above
In sputtering, what is the most effective way to increase the directionality of the material flux?
Increase the distance between the substrate and the target
Decrease the deposition pressure
Increase the deposition power
Install a collimator
Evaporation uses (lower/higher) deposition pressure than sputtering, which makes it (less/more) suited for lift-off.
Lower
Higher
Less
More
Check all that apply: RF sputtering can be used to sputter_____.
Insulators
Metals
Ti
TiO2
The sol-gel is a (a) of solid particle.
Which is NOT true for CVD?
a. Chemical reaction occurs at the substrate surface
b. Multiple precursor in vapor state is needed
c. Substrate or chamber is heated
d. Target and deposit composition are the same
