31–40 of 46 posts
Earlier quoted context omitted.
The kinetic diameter of water is smaller than helium because its polar nature allows it to adsorb and diffuse across solid surfaces. This behavior helps it fit through small holes better than helium can.
That sounds counterintuitive. I have a leak-free water supply yet bet it wouldn't be Helium thight.
Earlier quoted context omitted.
The kinetic diameter of water is smaller than helium because its polar nature allows it to adsorb and diffuse across solid surfaces. This behavior helps it fit through small holes better than helium can.
That sounds counterintuitive. I have a leak-free water supply yet bet it wouldn't be Helium thight.
Can we get a simpler overview of what this means for a layperson?
This is because these membranes do not rely on pore diffusion to segregate the molecules. Water permeates through these graphene-based membranes through an entirely different mechanism that relies on the intermolecular interactions between water molecules (i.e., hydrogen bonded networks of water). One He molecule does not interact strongly with another He molecule, and He molecules do not interact strongly with graphene. Water molecules, however, interact strongly not only with other water molecules but with graphene surfaces. This discrepancy in the intermoleculer and fluid-surface interactions is what fundamentally gives rise to this "strange" behavior of these graphene-based membranes.
Can we get a simpler overview of what this means for a layperson?
Membranes segregate mixtures of molecules into their individual components. This segregation typically requires pore diffusion and relies on the sizes of the molecules being distinct; the size of the pores within the membrane is chosen so that small molecules (e.g., Helium) can pass through it while larger ones (e.g., Neon) cannot. The behavior of these graphene-based membranes does not follow this typical train-of-t…
Are there any companies focused on mass-production of graphene material?
Earlier quoted context omitted.
The kinetic diameter of water is smaller than helium because its polar nature allows it to adsorb and diffuse across solid surfaces. This behavior helps it fit through small holes better than helium can.
That sounds counterintuitive. I have a leak-free water supply yet bet it wouldn't be Helium thight.
Earlier quoted context omitted.
Membranes segregate mixtures of molecules into their individual components. This segregation typically requires pore diffusion and relies on the sizes of the molecules being distinct; the size of the pores within the membrane is chosen so that small molecules (e.g., Helium) can pass through it while larger ones (e.g., Neon) cannot. The behavior of these graphene-based membranes does not follow this typical train-of-t…
@dang please add multi-upvote to your lisp, so we can reward high quality answers n-fold (maybe with a daily limit)