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| The "ink" typically used in dip-pen nanolithography to create patterns on gold surfaces is composed of what type of molecules: |
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| The instrument used to scan surfaces for nanometer-scale features is: |
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| Five Hundred nanometers is equvalent to ____ microns |
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| Name one experimental condition or parameter that affects the process of layer-by-layer deposition: |
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Definition
| pH, Salt content, temperature |
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| _____ are used in dip-pen nanolithography when the surface is glass instead of gold. |
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| ____ is the process by which a layer-by-layer assembly is disrupted for subsequent multilayer deposition on a surface. |
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| Quantum dots (Qdots) are considered as ____ dimensional nanostructures |
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| Qdot emission wavelength can be tuned by changing: |
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| To grow uniform nanocrystals, one must initiate ____ nucleation and ____ growth process |
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| Define aspect ratio in 1-D structures. How will you distiguish a nanoparticle and a nanowire in terms of aspect ratio? |
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Definition
| Aspect ratio is the ratio between an objects length and with. Nanoparticle has no aspect ratio (too small) |
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| How would you nanopattern the word "UCF" using gold nanopoarticles on a glass surface? Please select the interment to be used. What type of molecule will you use on the nanoparticle and/or the glass surface to create the nanopattern? |
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Definition
| Dip-pen nanolithography, Atomic force microscope. Saline thiol. |
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| What is dip-pen nanolithography? Do you think DPN is a sophisticated and expensive technology for mass scale nanoscale printing? Why? |
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Definition
1. DPN requires dipping an atomic force microscope in a nanomolecular ink, then using a bead of water between the AFM and the surface you are using the microscope writes depositing it's ink wherever its moved.
2. Yes, expensive and slow |
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Term
| Give at least a couple reasons why quantum dots are superior to traditional organic fluorescent dyes. |
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Definition
| Brighter, More sensitive, Change in size = change of color |
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| Qdots surface modification is critical to successfully apply them as biological taggants. Do you agree and why? |
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Definition
| Yes, because the surface of a Qdot is where we find specificity of the particle, it is critical that the surface contain molecules that will bind to the target cell. Without surface modification, Qdots we would not be able to control the effects they had on certain cells, thus limiting their use as a biological taggant. |
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| Name three routs of making one dimensional naostructures |
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Definition
1. bottom-up building
2. Template based
3. Soft template |
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Term
| Define top-down and bottom-up nanofabrication techniques? |
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Definition
| Top-down:reducing a larger particle to a particle on the nanoscale. Breaking tings from larger to smaller pieces. Bottom-up: building nanoparticles from the atom up. Building from small things to larger |
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| How do you distinguish one-dimensional nanostructures from nanostructures with zero-dimensions? Give examples |
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Definition
| 1-D has an aspect ratio (nanorod) 0-D is just particle |
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| If you were asked to attach a large number of small molecules onto the surface of a 1-D nanostructure and you have a choice to select either nanotube or nanorod of identical aspect ratio as 1-D support, which would you select and why? |
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Definition
| nanotube has larger surface area |
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| What is layer-by-layer self-assembly? The LBL technology could be effectively used for tissue engineering. Do you agree? Why? |
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Definition
| LBL is using cationic and anionic polymers and allowing them to stack layer upon layer. I agree. |
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Term
| For optical/fluorescent imaging applications, a nanoparticle must fluoresce at wavelengths larger than ____ in the area of the spectrum known as the ____ |
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| The surface of gold nanoparticles have high affinity for molecules and polymers containing ____ groups, while iron oxide nanoparticles have a high affinity toward molecules an polymers containing _____ groups |
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Definition
| thiol, carboxylate or hydroxyl |
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Term
| In metallic nanoparticles (Au,Ag) the surface plasmons are contained to the: |
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| Upon aggregation or self-assembly of gold nanoparticles a change in their ____ occurs that results in a change in the color of the nanoparticle solution from ____ to ____ |
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Definition
| surface plasmon resonance, red, blue |
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| Upon aggregation or self-assembly of iron oxide nanoparticles in solution, the ____ of the nanoparticle suspension will ____ |
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Definition
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| Unique properties of Nanomaterials (compared to bulk) |
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Definition
Fluorescence
Paramagnitivity
Catalytic Property |
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| Surface Plasmon Resonance Increases with: |
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