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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11 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 ...
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Which is the optical axis of fibres-in-host nanostructure material?

Suppose we have a nanostructred material composed of aligned (cylindrical) fibres embedded in a host, effectively forming a uniaxial crystal. Which would be the optical axis of this crystal, along ...
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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}}{\...
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How to perform quantum logic gates on plasmons?

in the link provided researches utilize strong two-plasmon absorption in graphene nanoribbons to create a “square-root-of-swap”, could such a device be utilized to perform other quantum logic gates? ...
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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 ...
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How does reflection and refraction of light behave for a colloidal solution of glass nanoparticles?

If I have a colloidal solution of glass nanoparticles (10-100nm diameter), how much of an effect does refraction and total internal reflection have on the transmission of the light? I know that if the ...
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What are ways or methods to calculate or measure the thermal conductivity of a hybrid nanoparticle?

I'm looking for ways of estimating or approximating the value of the thermal conductivity of two nanoparticles added or combined. Creating a hybrid nanoparticle.
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23 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 ...
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What is self narrowing atomic beam pantography?

Can anyone please explain what is this technique. This is a topic in second unit of GTU syllabus for Nanotechnology. I googled a lot but I don't understand what is that.
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About electrode self-energy and the relation between transmission functions and Green’s functions

I am reading Electronic Transport in Mesoscopic Systems by Supriyo Datta. I got stucked when deriving some formulas. On page 147, the book says "see exercise E.3.3" when it gives the formula (3.5.18), ...
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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 ...
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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 ...
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45 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 ...
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58 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 ...
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20 views

Crystallinity of Nanostructures

Based on several papers, the number of ZnO seedlings on the substrate, the post hydrothermal process, the growth time in the CBD (Chemical bath Deposition) process can affect the crystallinity of ZnO ...
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Solar panels efficiency [closed]

The efficiently of solar panels is quite low: about 30%. Could nanotechnology make improvements in solar panel technology?
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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 ...
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133 views

Why are energy levels in a quantum well discrete?

Assuming the potential is zero in $x$- and $y$-direction and zero between $z=0$ and $z=L_z$ and infinite for $z<0$ or $z>L_z$. This means the particle is confined in a layer which is infinitely ...
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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 ...
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36 views

Resistance to a nanoscale system like hydrogen atom? [closed]

Can we talk about the resistance to a nanoscale system? For example, the hydrogen atom. It is obvious that the conventional resistance formula $$R=\rho \dfrac{L}{A}$$ be unable to characterize the ...
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Why human knowledge about small scale physics is growing much faster than knowledge about big scale phenomena? [closed]

According to Kardashev scale there are subzero types civilizations according to their expertise in small scale physics (e.g. nanotechnology), which are classified according to Wikipedia as: Type ...
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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 ...
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74 views

Van der Waals Forces Between Stacked Material and Another Material

If I have a material (1) and I approach another material which is made from a stack of two different materials [ (2) and (3) ], how can one calculate the Hamaker constant or Van der Waals force ? ...
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About the practical benefit of the electromagnetic discovery in Cheops Pyramid [closed]

There's this Newsweek article titled "Ancient Egypt: Incredible Electromagnetic Discovery in Great Pyramid of Giza's Hidden Chambers" (here) that says that Now, an international team of physicists ...
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Why Pt-Ir Alloy or Tungsten is used for the tip in scanning tunneling microscopy?

Just want to know the properties which qualify these materials to be used as the same.
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How does the billion RPS nano rotor not break?

News articles tell of a dumbbell shaped silica nanoparticle, suspended in a circular polarized laser, reaching 60 billion RPM. I plugged 160nm (half of the particle length) into a centrifugal ...
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How to decide the resistance required to power a LED using triboelectric nano-generators?

I tried to power LEDs using triboelectric nanogenerators, https://youtu.be/OAmpvhRE4Ws, but found that I was unable to light even a single LED. Do it requires to connect resistors in series with LEDs ...
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29 views

Negative surface plasmon decay rate

I'm calculating surface plasmon decay rate $\gamma $ as [1], $\gamma = \eta \epsilon''$ where, $\eta = (d \epsilon_{g}'(\omega)/d \omega)^{-1}|\omega = \omega_{at\:resonace}$ and dielectric ...
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The Meaning of a Complex Energy in Electromagnetism

I am currently trying to understand the physics of a fabry-perot resonator with a complex dielectric function. This is in general a standard problem to consider, but including a complex dielectric ...
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35 views

Heating a monolayer atop a substrate with a laser

This problem is briefly mentioned in various research papers I'm reading, but it's never addressed in detail. The monolayer is attached atop a substrate as shown below The centre of the monolayer ...
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30 views

Orientational averaging of dipoles

I was reading a research paper where Quantum emitters with random dipole orientations are placed around a spherical nanoparticle. Then during calculations averaging over orientations is performed ...
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36 views

Making a particle accelerator with nanomaterials

In typical particle accelerators, protons are sped up by the electric field. From what I've read, neutrons can also be accelerated, by first accelerating protons and somehow converting them into ...
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37 views

Can the graphene's conductivity be explained using only orbitals?

I am trying to find a 'easier' or more 'intuitive' way to calculate the conductivity of graphene. I want do this by using atomic or molecular orbitals. Anyone have a clue about how this can be done? ...
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61 views

SAXS: Why would a second order peak behave differently than first order?

What is the significance of a second order peak in SAXS and during an assembly of nanoparticles, why would it have a different shape over time: What are factors that are unique to first or second ...
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34 views

What is the difference between functionalisation and passivation?

I know the basic principle of functionalisation and passivation is to add Ligands to the surface of nano particles which can limit the growth of nano-crystals in fabrication and improve proprieties ...
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713 views

What is the difference between Quantum Dots and nanoparticles?

As far as I understand, both quantum dots and nanoparticles are mainly characterised by the fact that all three dimensions are in the nanoscale. Quantum dots are always mentioned to be made from a ...
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Which experimental procedures exist for determining the elemental composition of a nanostructure?

I am doing nanostructures on semiconductors with focused-ion beam lithography, and I am interested to know if the elemental composition is changed at the surface where the sputtering occurred. ...
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22 views

How much information can be yanked out of an XRD Graph?

I have an XRD Graph(plotted data peaks between 2theta and intensity).I already Know the d-value corresponding to each peak.The material has an orthorhombic symmetry.What more information can I ...
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176 views

What happens if a metal wire that was one-atom in thickness was pulled across a finger?

What would happen if a metal wire that was one-atom was pulled across your finger? Would it cut off your finger, or would it pass through your finger without harming you? What if the metal one atom ...
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27 views

Can material of a channel influence the hydrodynamic resistance?

I checked in two books about microfluidics, and both of them mention that the only parameters that influence $R_{hyd}$ are related to geometry (width of channel, length, depth...) but it is ...
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225 views

Shear stress of a suspended sphere in a viscoelastic fluid

What I am trying to solve right now is that I have a magnetic particle (nanoparticle to be exact) floating in liquid that is viscoelastic and apply sinusoidal magnetic field. The applied magnetic ...
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56 views

Josephson energy versus magnetic field in S-Nanowire-S junctions

I was reading the proposal Microwave transitions as a signature of coherent parity mixing effects in the Majorana-transmon qubit by Ginossar and Grosfeld (2014) in which they envision a superconductor-...
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Does melting and recasting a nanosized metal destroy or modify it's nano state?

Would be recasted into sheet/plate. Would be mixing cobalt, nickel and graphene. If theres a modification in nano size or properties, could someone share what would it be. Also does it make a ...
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Is there a theoretical size limit by ferromagnetic materials?

Hemoglobin contains 4 iron atoms and oxidized hemoglobin is diamagnetic.1 On the other hand iron-oxide nano particles can be ferromagnetic.2 I did not manage to find any reference about the size limit ...
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How to decide between sizes of particles for maximum light intensity for scintillation?

Are nanoparticles or microparticles or quantum dots better suited as scintillation materials as far as light yield intensity is concerned? I was unable to find literature that compares micro vs ...
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What is stabilization of nanopartocles?

What is usually understood under the word "stabilization"? I know that nanoparticles can easily participate in the chemical reactions and unite one with another. And, for example, porous structures ...
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128 views

Capacitor electrode surface roughness

Does capacitor electrodes with high surface roughness provide increased capacitance over mirror polished ones? Rough surface have more surface area than perfecly flat one,more surface equals more ...
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63 views

conductivity of graphene

I am looking for an explanation of the fact that although graphene is a very good conductor of electricity, at the Dirac point the conductivity of graphene is very low. why? keep in mind that at Dirac ...
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Which nanoparticles are being used or can be used to deliver drugs for the treatment of tuberculosis? [closed]

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 ...
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Current work on molecular manufacturing

How much work is currently being done on molecular manufacturing (a.k.a. Drexler-style nanotechnology)? Or for that matter, is any at all being done? A Google search has turned up some what-if papers ...