The nanoscience tag has no wiki summary.
7
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2answers
62 views
Is light red shifted in optical tweezers?
This is a question I put to my supervisor during my PhD many years ago, and never really got a satisfactory answer to.
In an optical tweezers, assume that a beam of light is used to move a glass ...
7
votes
0answers
284 views
Measurement of Tangential Momentum Accomodation?
(this question is a crosspost from theoretical physics.)
I am using atomic force microscopy (AFM) for characterizing
pores of the size of nanometers for application in gas flow. For
this, knowing ...
6
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5answers
425 views
Nano-particle or Molecule?
What's the difference between something being labeled a "nano-particle" or it being called a "molecule"?
4
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2answers
173 views
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 ...
4
votes
3answers
340 views
Nanorobots. What stops us from producing them yet?
If we can already predicts accuratelly motion on molecular levels, what stops us from developing small robots to, for instance, navigate through our blood vessels looking for cancerous cells and ...
3
votes
2answers
116 views
If you had two “perfectly” flat surfaces of the same material?
Let's say you had 2 nano-engineered surfaces of diamond which were as 'flat' as possible (of course considering the radii of each carbon atom in the lattice)... would there be any friction between ...
3
votes
1answer
113 views
Nanotube chiral angle as a function of $n$ and $m$
I'm looking into nanotubes and I thought I'd assure myself that the basic geometry equations are indeed correct. No problems for the radius, I quickly found the known formula:
$$R = ...
3
votes
2answers
221 views
Nanotechnologies: current problems and general limitations
I have some questions about Nanotechnologies. I'm not physicist and my knowledges about the topic are limited by the "Engines of Creation" book by Eric Drexler. So I think that my questions are ...
3
votes
2answers
67 views
Layman's method to sharpen a wire (STM-tip)
We use a platinum-irididum wire to fabricate our STM tips. And by "fabricate"
I mean to cut it with really sharp pliers or scissors.
Sometimes we get good tips but most of the time they are not usable ...
3
votes
1answer
124 views
How are quantum potential wells fabricated?
Potential wells, such as infinite and finite potential well, have been the standard examples in quantum mechanics textbooks for tens of years. They started being only theoretical toy models but as ...
2
votes
1answer
496 views
Nanotech - zero dimensional fullerene
Not really a physics junkie, and I think this is a chemistry question, but since there's no chemistry.stackexchange.com (yet) I think here is the best place.
I was just reading up on nanotech and ...
2
votes
0answers
36 views
Absorption/Extinction formula of nanoparticles
I know the absorption/extinction equations in nanoparticle physics should be:
$$Q_{abs}=\frac{1}{2}\mathbf{Re}\int \mathbf{J}_{tot}\cdot\mathbf{E}_{tot}^\ast ...
1
vote
1answer
448 views
Why is honeycomb lattice the ideal shape for solar cells?
Quoting this web site (which I haven't thoroughly verified for credibility yet):
The material is graphene, also known
as graphite, a naturally-occurring
mineral that forms a one-atom-thick
...
1
vote
1answer
131 views
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 ...
1
vote
4answers
202 views
Quantum dots on the nuclear scale!
Quantum dots are quantum systems that are confined by definition on the nano scale. Why didn't people study similar systems on a much smaller scale, something as small as the dimension of the nucleus? ...
1
vote
2answers
105 views
Quantization of momentum in nanotubes
I'm reading about carbon nanotubes and how the momentum (lets call it $k_x$) is quantized along the circumferential direction and not along the cylindrical (call this $k_y$). I can follow the maths ...
1
vote
2answers
103 views
Light bending surfaces and energy funneling properties
In the last year there has been fuzz regarding metamaterials studied for the purpose of cloaking, and it seem to me they are somewhat glorified 2D waveguides, but in any case it seems a reasonable ...
1
vote
1answer
1k views
What is the approximate electrical conductivity $\sigma$ of graphene in S/m or S/cm?
I am trying to find an approximate value of the electrical conductivity $\sigma$ of graphene in units of S/m or S/cm. This table on Wikipedia gives $\sigma$ values for a variety of materials ...
1
vote
0answers
21 views
Ballistic Conduction - Difference between Bosonic and Fermionic Transport
Ballistic Conduction is the phenomenon of an ideal conduction environment for quantum particles - for electrons the Ballistic Conduction is not infinity, but is proportional to the difference between ...
1
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0answers
77 views
How to calculate radiative transition rate of exciton in a quantum dot with specific dimension?
I am writing rate equations for a nanophotonic system including three quantum dots. I need to calculate that radiative transition rates of exciton in ground state in those quantum dots.
In the paper ...
1
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0answers
47 views
Where can I find a complete list of metamaterials up to today?
Where might I find a list of all the metamaterials up-to-date?
1
vote
1answer
64 views
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 ...
1
vote
1answer
79 views
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.
1
vote
1answer
114 views
What kind of phases nanoparticles have (gas-solid-liquid)?
If a phase transition requires a number of particles that is in the TD-limit, can nanoparticles (~10 atoms) have phase transitions? What kind of phases and transitions nanoparticles have?
0
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0answers
53 views
Data set from Nanotechnology/Science Experiments
Does anyone know a source where I can get hold of data sets (or papers) generated from nano experiment. To give some examples:
1) Suppose in an experiment, the goal is to produce nanowires or ...
0
votes
0answers
31 views
About nanotubes
I have two questions related to nanotubes:
1.Which equations describe in a good aproximation the mechanical vibrations of nanotubes?
2.Which transport equation describes in a good manner the behavior ...
0
votes
0answers
56 views
Should we expect reliable nano-particle engines within the next 5 years?
"Regarding engines" what are the current theories and examples of ongoing progress in nanoparticles?
References:
National Nanotechnology Initiative
electric motor made from one molecule 18 atoms
...
0
votes
1answer
344 views
what's the size of carbon dioxide [closed]
First of all, I'm not good at English, so if you guys can use simple English it will help.
My question is very simple. How big is a carbon dioxide ($\mathrm{CO}_2$) molecule, i.e. the width, length ...
