Questions tagged [surface-diffusion]
10 questions
17
votes
4 answers
Molecular origin of solid-liquid and solid-vapour surface tension
I understand that surface tension arises at the liquid-vapour interface due to the asymmetric nature of long-range attractive forces and the short-range repulsive forces acting on the interface where there exists a gradient of density as we go from…
Apoorv Potnis
- 1,419
10
votes
3 answers
Why do not tiny cracks heal in metal via cold welding?
Or in other words: how do cracks inside metal survive given the phenomenon of cold welding?
If metal is overstretched, one or more fine cracks result along imperfections in the metal lattice. Why don't they disappear again if the stress force is…
xeeka
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3
votes
1 answer
How fast do $\rm CO_2$ molecules transfer between air and water at equilibrium?
Suppose a bath of water is in equilibrium with the air above it at temperature T and pressure P. The concentration of $\rm CO_2$ in the air is, say, 400ppm, and the concentration of $\rm CO_2$ in the water is whatever is needed to be in…
Peter A
- 610
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3
votes
0 answers
"Half-life" of a holographic grating imprinted on gold?
Reading further about gold after reading about Warren Buffet's 20 meter gold cube estimate in the BBC's How much gold is there in the world? I came across images of a kinebar which is an optical kinoform-imprinted bar of gold. The optical kinoform…
uhoh
- 6,089
2
votes
1 answer
Why fibers go to the liquid/liquid interface instead of staying in the bulk phase?
I have an ionic liquid solution phase and an organic phase. They are immiscible. When I place a small piece of nylon fibre in the liquid it always goes to the liquid/liquid interface instead of staying in the aqueous/organic bulk phase.
What is the…
1
vote
0 answers
Surfactant diffusion with Fick's 2nd law
Normally, the dynamic surface excess from fresh surface in aqueous surfactant solution is given by Ward-Tordai equation
$$
\begin{align*}
\Gamma(t) &= \sqrt{\frac{D}{\pi}} (2c_b \sqrt{t}-\int_0^t \frac{c_s(t)}{\sqrt{t - \tau}}…
Nam Nguyen
- 11
0
votes
0 answers
Electric field theorical value at an equipotential on a surface with conductivity
I'm not well versed in electrostatics and had this question no one could help me with (even after searching on the internet) : I have a surface (with its resistance increasing by 1kohm per centimeter²) and I have an electric battery (EB) with…
0
votes
1 answer
Diffusion 2D on a surface : diffusion coefficient and surface friction
We have a particle that is diffusing actively (meaning that the source of energy is a motor; the diffusion is like a Brownian motion, the only difference is that the diffusion coefficient is much higher) on a 2D flat surface in a fluid. The…
J.A
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0
votes
1 answer
Diffusion between 2 surfaces
Is the first time that I am asking something here, so I apologize if it is not the place, or I am not clear enough.
I am working on this problem where I have a protein place between 2 surfaces (top and bottom). The protein is bound originally to…
-1
votes
1 answer
What type of adhesion is at play when dust is collected by water
A washing tower that rains water down through a polluted gas will take up the particulates in the gas. They do this through adhesion, I'm pretty sure.
Now, there's apparently 5 types of…
A. Kvåle
- 365