Font size
WorksheetsIntroduction of Micro/Nanotechnology
Total questions: 29
Worksheet time: 15mins
To the naked eye, a solution of gold nanoparticles at a diameter of around 50 nm appears _______ (fill in the blank)
fluorescent because of short wavelength UV photon exchanges between the gold nanoparticles.
transparent because the particles are too small to be seen.
red instead of gold because of surface plasmon resonance effects.
metallic gold because the photoelectric effect still holds at the nanoscale level.
How many dimensions are quantum dot excitons confined?
0
1
2
3
Which one of these forces dominate at the deep nanoscale level? (10 nanometers or less)
Gravity
Van Der Waals
Electromagnetism
Inertia
A surface which is hydrophobic such as teflon will do what to a drop of water deposited on it?
Decrease the contact angle
Increase the contact angle
Hydrolyze the water so that it speads out or "wets" the surface
Presents a low enough surface energy that the water is absorbed into the material
The difference between the elastic and inelastic scatterings of a photon are:
In elastic scattering the photon continues after striking a particle without any loss of energy, but in inelastic scattering, energy is lost so the resulting scattered photon wavelength is longer
In elastic scattering the photon strikes a particle and gains energy, while in inelastic scattering the resulting scattered photon energy remains the same
In elastic scattering, two photons (the incident and emitted) are ejected from an electron while inelastic scattering simply has the original incident electron bouncing off the electron
In elastic scattering, the spontaneous emission of a photon comes from an excited electron while in inelastic scattering the photon comes from the reflection of a photon from an electron in a ground state
As the size of a gold particle decreases into the nanoscale regime, the melting point
goes up linearly
goes down linearly
stays the same
goes down at a non-linear rate
If you were to measure the surface roughness of a sample on the nanoscale, what would give the best visual representation of this characteristic?
An SEM ( Scanning Electron Microscope)
An AFM ( Atomic Force Microscope)
Raman Spectroscopy
XRD ( X-ray Diffraction)
The elastic property of nanomaterial will be...... in comparison to bulk materials?
Lower
Higher
Stay at the same
Cannot know
Following defects, what is the Schottky defect?
When the materials is reduced down to nanoscale, the electrical conductivity will be.......because of the present of.....
Decrease .... more diffusion at boundaries.
Increase......more diffusion at boundaries.
Nothing change .....boundaries
Increase .... less diffusion at boundaries
In sputtering technique, the thickness of deposited layer is NOT depended on:
Pressure of Ar
Voltage of electrodes
Type of gases
Vacuum of chamber
In photolithography method, what is NOT affected to the final resolution of sample:
Distance between the photomask and dryfilm
The quality of photoresist and photomask
The dose of UV exposure
The type of photoresist: negative or positive
In the drug delivery process, What is NOT TRUE about active targeting?
Affinity ligands (e.g. antibodies, DNA/RNA) are attached to nanoparticle surface
Depend only on the size of nanoparticles
After the nanoparticle is bound to the target cells, the drugs carried within is released inside the target cells
This allow the Nanoparticle carrying drug to recognize and bind to target cells having specific receptors on their surfaces, e.g. tumor cells
The surface area to volume ratio of a sphere with radius 1 cm is R1 and that of a sphere with radius 5 cm is R2. Then R1= ____ R2
3
1/3
5
1/5
Nanoscience can be studied with the help of...
Quantum mechanics
Newtonian mechanics
Marco-mechanics
Geophysics
What is NOT TRUE about nanocatalyst?
High surface to volume ratio
Cost saving
Reduce the waste
Increase the environment impact
In the application of thermo-response polymer to cancer treatment, what is TRUE about this polymer?
At higher temperature than Lower Critical Solution Temperature (LCST), the polymer is hydrophilic
At lower temperature than Lower Critical Solution Temperature (LCST), the polymer is hydrophobic
At tumor tissue, the temperature is lower than the polymer can release the drug.
The state of the polymer can change reversible by changing the temperature
In application of nanotechnology, the fertilizer can be coated by nano-layer of polymer, so what is the NOT TRUE benefit of this coating?
Increase the solubility
Protection
Reduce the contact of active ingredients with agricultural workers
Environment-reducing run-off rates
In the application in food, the smart packaging is defined as : "Smart packaging is the type of packaging used to indicate the internal condition of the product such as the shelf life of the product", So what condition below is NOT TRUE?
Humidity
Freshness
Time
The type of food
In food processing, what is Not TRUE about nanocapsule?
The micro substances are in capsules form having diameter of 3 to 800μm with a nano-scale encapsulation.
The walls of cavity are formed with biopolymer materials
Reduce the flavoring characteristics
Have potential to slow and control release near to target point and enhance bioavailability
The inter-molecular bonding is...
Physical bonding
Chemical bonds
Metallic bonds
Covalent bonds
What is NOT TRUE about the nanofertilizer input?
Increase the uptake efficiency
Increase the release efficiency
can be prepared by physical, chemical or biochemical methods
Only the coating layer dimension is considered.
What is NOT true about the quantum dot application in television screen?
Its small size
Its simple fabrication process
Its true colors of emission light
In the SEM methods, what are detected?
Back scattered electrons
Secondary electrons
Both of them
None of them
What below statement is NOT TRUE about quantum confinement for Quantum dot?
The radiation is "red" shift
The band gap is larger
The energy band change from continuous to discrete
Change the size, change the emission frequency
The Surface Plasmon Resonance phenomenon, What is INCORRECT?
The size of particle is smaller than the wave length of light
It can happen for any kind of material
The electromagnetic field interacts with electron in valence band
The emission by light and heat.
What statement below about photolithography is TRUE?
We can use any wavelength of light to expose the photoresist.
The negative photoresist, the exposed region will be remained after development
In the positive photoresist, at exposed regions the cross-linking are create to make harder regions.
The development time is not important, we can develop as much as possible to ensure that unused regions are removed.
For a Drug Delivery System, the nanomaterials can be seen as a carrier for drug, but it still need more factors as Imaging agent and (a)
What is NOT TRUE about Super-paramagnetism of nanoparticles?
Contain single domain
Can response very fast when the external magnetic field is applied.
Keep the high magnetic properties without external field.
Can apply for cancer treatment
