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.

Filter by
Sorted by
Tagged with
1
vote
0answers
9 views

Variables in Photoionization and Work Function of metals

Do metals engaged in coordination bond have the same work function and/or photoionization of the pure metal? The outer electron shell still remains the same. If photoionization were to happen, what ...
0
votes
0answers
5 views

Nanoscale Melting Point Depression

Changing the size of a bulk material lowers the melting point of it. However there is only mention of this happening to metallic nanoparticles. Is this exclusive to metallic elements or can it also ...
2
votes
2answers
52 views

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. ...
1
vote
0answers
30 views

How do I determine which surface energy of a crystal silicon planes is the lowest? [closed]

If a thin 8” Diameter Single Crystal Silicon (001) substrate is accidentally dropped onto a concrete floor, it will break apart into pieces. By considering only the surface energies of (001), (110) ...
0
votes
2answers
51 views

Could a nanoscopic grain of tungsten moving at ludicrous speed make a sonic boom?

Writing a scifi story about a civilization with mature nanotechnology. Grain of tungsten is a proxy for a nanite. If such a tiny thing as a nanogram of tungsten somehow got accelerated to some truly ...
0
votes
0answers
14 views

Electromagnetic Separation

Is there any method that can separate nanoparticles of different sizes in a suspension using light? Something similar to this https://www.researchgate.net/publication/...
0
votes
0answers
5 views

In AFM, is “phase imaging” a type of “phase-modulation based AFM”?

I am reading up on the techniques used in atomic force microscopy (AFM). On the website, nanosurf.com https://www.nanosurf.com/en/support/afm-modes-overview/dynamic-modes#dynamic , phase modulation is ...
0
votes
0answers
6 views

Coupling of Localized Surface Plasmon SERS

I start working on SERS, but I am a chemist. So I am not familiar with the physics behind it. I studied a lot of papers on the topic and got deeper into the physics behind it. So I had a challenging ...
0
votes
0answers
15 views

How to ease/reduce surface roughness caused by ion sputtering?

I want to investigate the electron emission of samples under electron bombardment. Experts will know that surface condition plays a huge role in the emission rate and some other properties (e.g. max ...
5
votes
0answers
63 views

What causes materials like Vantablack to have their high optical absorption properties?

As per the title of this post. From reading, I understand that blackbody radiation is a factor I should consider here, with light being absorbed and converted to heat etc. However, what I want to ...
1
vote
1answer
34 views

Metasurface holography as a principle behind volumetric displays?

Disclaimer: By no means am I a physicist of any kind so complete inability to grasp complex physical concepts without spending ridiculously unreasonable amounts of time on corresponding research is a ...
2
votes
0answers
63 views

How is ECR (Electron Counting Rule) done in a structure?

I've been told how to apply the ECR to GaAs{001}(2×4) in my lectures but it makes no sense to me and I don't seem to be able to find any other sources that explain this. (This is a further question on ...
0
votes
2answers
70 views

Can we connect several Nano Spacecraft moving at 20% speed of light? [closed]

Nano spacecrafts are one gram silicon chips that will be accelerated to 20% of the speed of light to reach Alpha Centauri in 20 years. I wonder could we connect several spacecraft after they were ...
0
votes
1answer
52 views

Which is the correct GaAs{001}(2×4) structure?

When trying to understand the GaAs 2x4 surface reconstruction, I came across the following statement: "Because the periodicity of the surface has doubled (compared to the bulk periodicity) in the ...
0
votes
0answers
22 views

How do I sketch a (2X1) dimer structures on the (001) surfaces of a Zinc Blende structure of III-V materials like GaAs?

I'm trying to sketch a $(2\times 1)$ dimer structures on the $(001)$ surfaces of a Zinc Blende structure of III-V materials like GaAs. I understand that a Zinc Blende structure can be represented as ...
1
vote
2answers
64 views

Does the Thomas-Fermi screening length formula only apply to metals?

Does the Thomas-Fermi screening length formula only apply to metals? In my notes, the Thomas-Fermi screening length is: $\lambda_{TF}^2 = \left(\frac{\pi}{6}\right)^{1/3} \frac{\epsilon(0) a_0}{4n^{1/...
1
vote
1answer
17 views

What is the meaning of “screening-out a perturbation” in a nanosurfaces context?

When reading my lecturer's notes on the Thomas-Fermi screening length, I am told that: "The Thomas-Fermi screening length $\lambda_{TF}$ is a rough guide to how rapidly an electron gas can screen ...
4
votes
1answer
459 views

What is the physical limit to how small semiconductors can get?

Wikipedia shows this history of the progressive miniaturisation of semiconductors: ...
0
votes
1answer
39 views

What is the electron effective mass value for a $\rm InSb$ lattice?

I'm trying to calculate the Thomas-Fermi screening length of the III-V semiconductor $\rm InSb$ with doping level $n = 5 \times 10^{18} \text{cm}^{-3}$ ($5 \times 10^{24} \text{m}^{-3} $ in SI units) ...
0
votes
1answer
27 views

Fermi surface of a spherical nanoparticle

Assume to have a spherical nanoparticle of a metal whose Fermi surface in the crystal is a sphere (I think those are the metals having very symmetric crystals). Would then the Fermi surface be ...
0
votes
0answers
21 views

How to minimize beam walk off during quarter wave plate roration

I am currently building a laser scanning microscope setup. I need to focus the laser on my sample and also place a quarter-wave plate right before the sample so I can control the polarization of the ...
2
votes
4answers
108 views

Is it possible to transfer light between two elements at a distance closer than the wavelength of the light?

Let's say we have a nanoscale laser or led(5nm width/length/height) emitting photons(red, 650nm wavelength) in a direction parallel to its plane, then at 20nm distance in the direction of the emission ...
1
vote
1answer
72 views

Understanding conductivity at nanoscale and validity of Ohm's law

Nanoparticles such as gold and silver are becoming more and more used to print circuit or enhance electrical properties of another material. But I have not been able to find sources that clarify how ...
0
votes
0answers
22 views

Slow varying envelope approximation (SVEA) in solid state systems

I remember there is some sort of slow varying envelope approximations (SVEA) when studying wavefunctions in solids, expecially quantum wells, but can' t remember any reference. Is there a good ...
0
votes
0answers
12 views

Measurement of particle thickness on Scanning Electron Microscopy

I have a material (powder) that is likely to be crystalline and forms plate-like particles. Observed by SEM, I can clearly see the plates stacked on each other. It seems that during sample preparation,...
0
votes
0answers
26 views

DLVO for complex solutions

I am working with a complex solution of 2 proteins and salt. I have been trying to use DLVO (Derjaguin, Landau, Vervey, and Overbeek) theory to get an approximation of the Van Der Waals attractive ...
0
votes
0answers
29 views

Any open-source to animate 2D materials in 3D. (e.g. van der Waals heterostructures, 2D crystal layers etc.)

I want to model different 2D nano-structures, layered materials in 3D (animated version). Is there any open source where I can build these structures?
1
vote
0answers
35 views

What are the properties of the Rice University self-assembling wires?

I've recently watched a video from Rice university, (https://www.youtube.com/watch?v=w1d0Lg6wuvc&t=3s) where they used an electric field to remotely stimulate CNTs to form a wire. This wire was ...
1
vote
1answer
56 views

How to read some certain band diagrams?

I have some problems on understanding some semiconductors band diagram. For instance, I understand quite well something like this: I understand it because it is quite simple: there are the energy ...
0
votes
1answer
23 views

Applications of nanomechanics

What are applications of nanomechanics beyond its use in atomic force microscopy? The question is specifically about the existing applications rather than the potential/future ones (which are quite a ...
0
votes
0answers
26 views

Moving Magnetic Particles with Electromagnet

I wanted to buy a round electromagnet that could create an oscillating magnetic field to move some magnetic particles from a very close distance. This is my first time working with electromagnets. So ...
3
votes
1answer
71 views

Plausibility of detecting viruses using optical spectra [closed]

Ok, this is a huge long shot, and I also apologise if this is a poor question (I'm a newbie here...). This doesn't seem to me a strictly perfect fit for Chemistry.SE, Biology.SE, or Photography.SE ...
1
vote
1answer
22 views

Is “quaternary” adjective redundant while speaking of InGaAsP?

I'm reading an article. One sentence looks as following: The 500 nm thick waveguide layer consists of an InGaAsP quaternary layer But since InGaAsP is quaternary compound, why do they write ...
0
votes
1answer
93 views

How can a picture of a virus be taken when they are not even 300 nm (wavelength of blue light) long?

We cannot take photos of protons because they are not at least the size of the wavelength that registers into visible light. I see photos of Coronavirus in the news everywhere where there is a clear ...
0
votes
0answers
38 views

What is the difference between non-local optical response and local optical response?

Does anyone knows what is the difference between non-local optical response and local optical response in metal-dielectric-metal?
0
votes
1answer
138 views

What does the density of states of a bulk material, 2DEG, quantum wire and quantum dot tell me?

This is a rather long winded questions so I hope that I can get my questions across as coherent as possible. Background: I am a third Semester Nanoscience student and I am taking my first QM course ...
0
votes
1answer
22 views

Atomic Layer Deposition [closed]

What is "conformality" in atomic layer deposition? As in 1. "recombination of radicals on the sidewalks limits the conformality in high aspect ratio structures" Or in 2. "Key advantage of ALD is ...
0
votes
0answers
23 views

synthesis of free standing silicene

Unlike graphene which can be isolated from graphite via exfoliation, the same thing can't be done with silicene. Most of the papers I see usually involve synthesis of silicene on a metal substrate ...
1
vote
1answer
31 views

How does adding high energy density metallic nanoparticles increases the burning rate during a combustion process?

I have been reading about combustion and oxidation, and I have found out that by adding metallic nanoparticles (e.g aluminium nanoparticles) the burning rate of the propellant increases while the ...
0
votes
0answers
281 views

Difference between electrical conductivity and optical conductivity

Is there any difference between electrical conductivity and optical conductivity? How to explain it physically and is there any method available to connect them mathematically? If I calculate carrier ...
1
vote
2answers
71 views

Why does carbon nanotubes look “furry” in scanning electron microscopy?

In scanning electron microscopy images, carbon nanotubes looks quite different from the schematic hexagonal structured tubes which usually describes them. How come they are all bent and "furry"?
0
votes
1answer
15 views

What does “Metal based electronic transition” means?

Recently I've been reading on the chiroptical activity of metal nanoparticles protected by biomolecular ligands, which have optical activity signals that are manifested in the metal-based electronic ...
1
vote
1answer
101 views

Numerical calculation of skyrmion number

I'm having trouble finding a numerical method to calculate the skyrmion number for a certain system. I want to calculate $$ n = \frac{1}{4\pi}\int \textbf{M} \cdot \left( \frac{\partial \textbf{M}}{\...
1
vote
1answer
115 views

Why are gold nanoparticles red?

While watching the latest computerphile video (https://www.youtube.com/watch?v=FGiBHsUkVzU) I came across a solution of nanoparticles of gold , but to my surprise, they appeared as red, shouldn't ...
0
votes
0answers
37 views

Derivation of Hamiltonian of EP-modulated microring resonator

I'm an undergraduate in a nanophotonics lab and I need to derive something for my PI, but don't exactly know how to go about it. When reading a relevant paper, it was given that the Hamiltonian of an ...
1
vote
1answer
37 views

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 ...
1
vote
0answers
161 views

How to find energy levels formula for symmetric triangular potential well [closed]

As some of you already know that the asymmetric triangular potential well has the energy level where an here refers to the airy function a1 =2.338, a2=4.088, a3=5.521 and a4= 6.787 and V=eFz (F here ...
0
votes
1answer
76 views

How accurate is it to use 12-6 LJ potential for interaction between nano-particle and Hydrogen molecule in LAMMPS?

I am trying to simulate a large system containing nano particles (that are fixed in space) and gas molecules passing through the void space between nano particles using LAMMPS. The nano particles have ...
0
votes
0answers
304 views

A simple thin-film transmittance calculation problem

I am trying to reproduce results of thin-film transmittance given in this article by using this online thin-film calculator tool (www.filmetrics.com). I would like to use the calculator later for more ...
1
vote
0answers
28 views

At what concentration do dispersed particles begin behaving like a fluid?

Suppose that I have a nearly insoluble metallic compound in a solution, and that what little of this compound does dissolve aggregates to form nanoparticles. The number of nanoparticles is ...