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Questions tagged [nanoscience]

The study of the performance of ultra-small structures, materials, and devices, usu. usually 0.1 to 100 nm; also, the study of manipulating materials on an atomic or molecular scale. Nanoscience is sometimes used interchangably with Nanotechnology, which is the manipulation of matter on an atomic and molecular scale.

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How to determine the (n,m) dimensions of a carbon nanotube?

I've been reading about nanotubes lately, and I keep seeing the $ (n,m) $ notation. How does this describe a nanotube's structure? How do I determine which is $n$ and which is $m$ ? I'm familiar with matrix notation referring to rows and columns,…
Kit
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Nanotechnologies: current problems and general limitations

I have some questions about Nanotechnologies. I'm not physicist and my knowledges about the topic are limited by the "Engines of Creation" book by Eric Drexler. So I think that my questions are related mostely to popular science. As far as I know…
Eliah
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Low cost Ultra High Vaccum Chamber and Atomic Force Microscope

Is it possible to build low cost Ultra High Vacuum Chambers and Atomic Force Microscopes? I found a publication about a low cost AFM and I also found instructions for a Ultra High Vacuum chamber. However the latter is not complete. Are there any…
eeqesri
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What are 'superlattices' and 'artificial atoms'?

An introductory book to nanotechnology (Nanotechnology: An Introduction by Jeremy Ramsden) states the following: Stacking objects with nanoscale sizes in one, two or three dimensions (yielding nanoplates, nanofibers and nanoparticles with,…
user56834
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How can you add an exactly one-atom-height layer upon your material?

So for example let's say I have a 2cm x 2cm x 2cm cube of gold powder. Now I want to add just another layer of 2cm x 2cm x 1 atom upon it. It's been a long time since I last read some physics but I figured the answer might be electrostatics.…
d9ngle
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Why are carbon nanotubes are so difficult to create?

I have heard that the future of the techonolgy are the carbon nanotubes due to their resistance and conductivity, but why are they so difficult to create?
Jean Paul
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Estimating the number of atom/nuclei in a single quantum dot

I often read in introductions about quantum dots that depending on the fabrication method, a single dot contains about 100 - 100000 atoms. Assuming a self-assembled dot of lens or pyramid (cone) shape, I did some rough estimation by considering the…
Shiki
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Absorption/Extinction formula of nanoparticles

I know the absorption/extinction equations in nanoparticle physics should be: $$Q_{abs}=\frac{1}{2}\mathbf{Re}\int \mathbf{J}_{tot}\cdot\mathbf{E}_{tot}^\ast dV=\frac{\omega}{2}\mathbf{Im}(\epsilon)\int|\mathbf{E}_{tot}|^2dV$$ also, for the…
Hui Zhang
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One-dimensional (1D) CdSe nanostructures

I'm not a physicist, but I'm really interested in Nanotechnology. I've a question, and I hope that I can be provided by an answer. I was reading some articles about the one-dimensional CdSe nanostructures. My question is why it's called…
user9292
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What is surface plasmon of metal nanoparticles?

I really want to understand about the Surface Plasmon of metal nanoparticles, if anyone can explain it to me i'll be grateful. I have checked Wikipedia for it but didn't get anything clear.
Rafael Adel
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What is the electrical conductivity (S/m) of a carbon nanotube?

I have been searching around for a while for this but I am having trouble finding any actual figures, all I can seem to find is that it is "very high". So I am wondering, does anyone have any figures of what the electrical conductivity of a carbon…
wow
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Micro-world Perception: What does a microbe perceive as it's being, say, sloshed in a glass of water?

I've wondered how micro-organisms perceive the larger world, it's forces and the consequences the relatively massive forces have on such tiny objects. Let's say E coli (0.5 micro meters width, 2 micro-meters length) in a pure stream of water,…
George Elov
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What is the mechanism of photo thermal heating in metal nanoparticles?

What are hot electrons? What is the role of hot electrons in dephasing of excited surface plasmon ( in metal nano particles) via nonradiative decay which accounts for photo thermal heating? I'm not getting a complete picture of phothothermal…
SARANJITH P
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Which nanoparticles are being used or can be used to deliver drugs for the treatment of tuberculosis?

I am basically interested in treating tuberculosis using nanotechnology. Anything from the field of nanotechnology be it nano particle, carbon nano tubes or any other than these (which I am not aware of) will be helpful.
knlagg
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Determining thin film depth with nanoindenter

I started doing lab work with nanoindenter on project my teaching assistant got from uni. We are trying to get thickness of thin film (Titanium dioxide) placed on Silicon substrate. My idea was to measure hardness of that bilayer and determine at…
Vinko Srsan
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