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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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Predicting electrical mean free path in nanostructures?

How does one roughly predict the mean free path for electrical conduction in a nanostructure at different temperatures and under different electrical conditions such as different voltages and ...
ProfessorMoreRight's user avatar
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Modelling Mie Theory: Resources

I am currently working on simulating the scattering of light from nanoparticles. Are there any resources like books/ handouts/ videos that explain Mie Theory in depth?
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Ultra-strong nanocrystalline metal without transition to superplasticity

It is known that a decrease in the grain size of a polycrystalline metal to 1 micron is accompanied by an increase in its strength by several orders of magnitude (super-strength) almost to the ...
Ванек Огонек's user avatar
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Simultaneous measurement of the size and mass of nanoparticles in liquid

The size of colloidal nanoparticles in a liquid can be measured from optical reflectance (or absorption) spectra. The smaller the metal (semiconductor) nanoparticle, the more its color shifts to the ...
Ванек Огонек's user avatar
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Interpreting the van der Waals Energy Discrepancy between $\rm MoS_2$ and Graphene Layers in Computational Simulations

I am conducting computational simulation tests and have observed that when simulating systems like molybdenum disulfide ($\rm MoS_2$), the interaction between layers (S-S interaction) is quite strong, ...
benjamin_ee's user avatar
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How would surface dipoles change the internal potential in a conducting sphere?

In the nanoscience literature, there is a model of semiconductor nanoparticle doping which ascribes the effect to surface dipoles shifting the absolute state energies relative to the environmental ...
intraband's user avatar
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How can you rapidly warm a large body uniformly? [closed]

Given a very non-homogenous large object (mainly water) that's vitrified (cooled down without ice formation) and stored in liquid nitrogen, how do you heat it up to room temperature without ice ...
Heye's user avatar
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Can the band gap of quantum dots (QDs) be determined just by knowing the Bohr radius and the size of the QDs?

After extensive research, I've discovered that accurately determining the emission wavelength of quantum dots (QDs) requires understanding several key factors. As highlighted in the book "...
BME2023's user avatar
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Carbon Nanotube Modeling

In various references, we see the construction of unit cells of carbon nanotubes from chiral and translational vectors. The chiral vector is given as: $$\vec C_h = n\vec a_1 + m\vec a_2$$ While the ...
benjamin_ee's user avatar
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Shot noise coupled quantum system

I have a question about noise in a coupled quantum system. Suppose you have two parallel 1D waveguides, which are separated from each other by a thin tunneling barrier. The subband energies of the ...
B4ckflip's user avatar
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Quantum point contacts (QPC) conductance smearing

I have a question regarding the smearing of conductance plateaus of quantum point contacts (QPC). Conductance plateaus smear if the system is at a finite temperature $T > 0$ K. What is the exact ...
B4ckflip's user avatar
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Wavefunctions of quantum point contacts

I have a question about the potential and wave functions of discrete energy levels of quantum point contacts. Assuming one has a rectengular potential well: Can the potential of the QPC be assumed to ...
B4ckflip's user avatar
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What is the difference between nanomaterials and quantum materials? [closed]

As per my knowledge, they are different according to their dimensions only. Can you please explain if I am missing something?
Sudeshna Sahoo's user avatar
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What photonic properties of a subwavelength plasmonic cavity make it generate saturated structural colour in just one layer?

I have a photonics question regarding a paper I am reading. Physics is not my area of study so please be kind :)) https://doi.org/10.1126/sciadv.adf7207 In this paper, the group has fabricated a self-...
anfjnn's user avatar
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Why are new compounds in materials science investigated and categorized under low-temperature thermodynamic properties? [closed]

Is it solely because these materials are usually not as interesting in ambient temperatures?
Eray's user avatar
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Why $\rm ZnO$ looks transparent?

I'm looking for the reason transparent of $\rm ZnO$ and found out nanoparticles of $\rm ZnO$ do not scatter reflected light can I conclude like this: material can be transparent if pass light or ...
Najva's user avatar
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Population inversion requirement for multiexcitonic lasing

I am working with optically active nanomaterials (quantum dots, perovskites), that have pretty large exciton binding energies and can form multiexcitonic complexes, e.g. biexcitons, relatively easily. ...
Vadim's user avatar
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How much electricity can be directly generated from air humidity?

There have been some recent papers on harvesting electrical energy from air humidity using nanoengineered materials: "Power generation from ambient humidity using protein nanowires" in ...
David Bailey's user avatar
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Charge conductivity by Non-Equilibrium Green Function Method

I am reading the calculation of charge conductivity by Non-Equilibrium Green Function (NEGF) method in this following paper. Van-Nam Do, Non-equilibirum Green function method: theory and application ...
Kieran's user avatar
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Functionalizing iron oxide nanoparticles for antimicrobial activity [closed]

I'm working on my thesis which is about synthesis of iron oxide nanoparticles from a plant leaf extract and testing the particles activity on bacteria to measure their toxicity towards it. The thing ...
just asking's user avatar
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1 answer
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What is the difference between demagnetizing tensor vs demagnetizing factor

I know the first one is a tensor that basically shows components and the second is a scalar. Problem is some references call factor to the tensor and others call demagnetizing factor to the components ...
Myr89's user avatar
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What is the result of replacing potential function in time independent Schrodinger's wave equation by the potential function in Poisson's equation?

I have to couple above two equations and put the value of V from Poisson's to Schrodinger's equation and I am doing so to understand the mechanics of MOSFETs. I have studied most topics in quantum ...
debashish's user avatar
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How do defects in a superconducting nanostructure affect the supercurrent?

I was wondering how point defects in a superconducting nanowire affect the supercurrent flowing through this wire. In a naive view I am expecting the defect to decrease the maximum current allowed in ...
Fabian's user avatar
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What is difference between Quantum optics and photonics in general?

Might be a vague Question, But I'm hard to understand it. My Interest is Quantum optics, which studies Atom optics, Optical coherence, and experimentally proven foundations of Quantum Mechanics. ...
Sora S's user avatar
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Informations about non-Markovianity? [closed]

What are the examples of the practical implementations of studying the non-Markovian dynamics of such open quantum system (e.g. quantum dot)?
Ayoub EL-Amrani's user avatar
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1 answer
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Quantum dots applications [closed]

I wanna find some interesting project for my master thesis concerning quantum dots, meanwhile I'm learning open quantum dynamics (Markovian & non-Markovain). Is there some ideas to combine these ...
Ayoub EL-Amrani's user avatar
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3 answers
59 views

Why is nano-meter technology not used to jam more coils into incandescent light-bulbs as done with semiconductors?

Why is nano-meter technology not used to fit coils into incandescent light-bulbs? I know we use nano-meter technology to fit more transistors into a small area on a silicon chip, but why do we not use ...
Coo's user avatar
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1 answer
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Can we synthesis pico materials or femto materials?

Currently we know that the radius of an atom is of the order $10^{-10} m$ and nucleus' radius is of the order $10^{-15}m.$ We also know that nano-materials does exist and can be synthesised by various ...
gobbledy-gook's user avatar
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1 answer
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For a quantum system with two contacts, how does one construct the contact hamiltonian for NEGF transport?

For context, I have been going through Supriyo Datta's NEGF course, slides, lecture material, and have been learning how to simulate quantum transport in his formalism. For simplicity, consider a 1D-...
jazzloaf's user avatar
1 vote
1 answer
63 views

Would a wireless (stringless) Yo-yo be possible? [closed]

I have this interesting idea for a toy (not a real one, it's for a story). It's a stringless yo-yo that uses electromagnetism to mimic a regular yo-yo. The user wears a ring on their middle finger ...
throwaway account's user avatar
2 votes
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Can second harmonic generation be stronger than fundamental frequency interaction in metals/dielectric nanoparticles?

Quick question regarding non-linear optics: A nanoparticle, either dielectric or metallic present second harmonic generation. The dielectric, following the simplest modelization as: $$E(2\omega)\...
Javier A's user avatar
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Carbon nanotube hydrophobicity

Xinyou Ma, Chenghan Li, Alex B. F. Martinson and Gregory A. Voth, Water Assisted Proton Transport in Confined Nanochannels states that carbon nanotube is hydrophobic. That means, as I understand it, ...
Hans's user avatar
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1 answer
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Can nanotechnology build a virus? [closed]

I heard that nanotechnology can arrange atoms the way one wishes. The atomic force microscope can control the arrangement. As the composition of the viruses is known, can by nanoprinting a virus be ...
Mercury's user avatar
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1 answer
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Can sound be used to identify a molecule?

A few notes to this: Can a molecule have a particular "response" to sound? I understand that soundwaves arise from the synchronisation of millions of particles but assuming such a fine ...
Hews's user avatar
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What are the steps that give rise to this following resistance equation for a diffusive transport of electrons?

$ R = R_b (1 + \frac{\lambda}{L})$ Source - page 6 of this book: https://nanohub.org/courses/FON1/01a/asset/15698
Anonymous's user avatar
2 votes
3 answers
2k views

Why is the Fermi wavelength in a semiconductor larger than in a metal?

I am a high school student, trying to better understand quantum point contacts. Would appreciate a simple explanation if possible. Source: https://arxiv.org/abs/cond-mat/0512609 Since the conductance ...
Anonymous's user avatar
2 votes
0 answers
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Are quantum dot’s immobile?

In a recently closed question regarding the cooling of quantum dots through lasers has one of the commentators state that this is in fact impossible as QD’s are immobile: Can quantum dots temperature ...
Evamentality's user avatar
-6 votes
5 answers
176 views

What is wrong in this example with Heisenberg principle?

On Heisenberg principle Suppose an electron is beamed in a nanotube with (width $\Delta x$) on which has been applied a negative voltage so the walls are repealing the electron and it can not approach ...
Mercury's user avatar
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2 votes
1 answer
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Can electromagnetic standing waves be used to move particulates?

As detailed in this paper: https://www.researchgate.net/publication/3941396_Ultrasonic_separation_of_suspended_particles The researchers use the formation of acoustic standing waves to deposit ...
Evamentality's user avatar
1 vote
1 answer
31 views

What dimensions would a quantum confinement system have to be for its electromagnetic emission spectrum to be in the radio section?

Just as specific dimensional restrictions on systems that have quantum confinement like quantum dots lead to the tenability of the emission spectrum of such a system, I was wondering how this idea ...
C-Consciousness's user avatar
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1 answer
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Would a macroscopic sphere with the thicknesss of a few atoms behave as an artificial atom?

As quantum dots are composed of closely packed atoms, where their electronic levels are bound and in a confined system, would a similar system, with the same thickness as a quantum dot but much larger ...
Evamentality's user avatar
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Practical to measure topography of a large area (mm-scale) with scanning probe microscopy (SPM)?

I'm currently very new to nanotechnology. I do understand that it is possible to achieve an excellent topography image of a sample by SPM. However, is it possible to do SPM over a large area (for ...
Kanthee Kosolyuthasarn's user avatar
1 vote
1 answer
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Silicon Nano materials

Bulk Si has indirect bandgap structure. But when we make Si into nano particles it behaves like a direct bandgap. Why?
Rahul Patel's user avatar
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21 views

One Dimensional Heterostructures

Van Der Walls Heterostructures stack different single layer materials together. However, just as a layer of various graphene sheets form graphite with weak bonding in between making the layers easily ...
Evamentality's user avatar
1 vote
0 answers
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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 ...
Evamentality's user avatar
3 votes
2 answers
236 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. ...
eeqesri's user avatar
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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) ...
Cherry Blossom Bomb's user avatar
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2 answers
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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 ...
Gollor's user avatar
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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 ...
Kutadgubilig's user avatar
5 votes
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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 ...
Jenson Holden's user avatar

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