Comment by newpavlov

Comment by newpavlov 5 hours ago

>Try not to breathe any, studies are still pending but that stuff gets everywhere.

I would understand such comment in the context of carbon nanotubes or fullerenes, but graphene? Have you forgot that graphite is literally a bunch of stacked graphene?

Considering how much graphite pencils are used across the world, we would've seen hypothetical negative effects already with a high degree of confidence.

Yes, graphene production aims to produce larger sheets, but it only makes graphene less biologically active, not more.

throwup238 4 hours ago

> Considering how much graphite pencils are used across the world, we would've seen hypothetical negative effects already with a high degree of confidence.

Graphitosis is the graphite equivalent of silicosis and asbestosis so yes we’ve got plenty of evidence it’s harmful, but it’s mostly a problem with occupational exposure where large amounts of graphite dust are produced.

That might change if there’s tiny sheets of graphene flaking off everywhere from nanocoatings and it turns out to be carcinogenic for the same reason asbestos is (which isn’t out of the question given the studies on CNTs and nanotoxicity in general).

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newpavlov 3 hours ago

IIUC graphitosis, silicosis, and black lung require to inhale ungodly amounts of dust. It's orders of magnitude more than we can expect from flaking-based trace contamination.
Why do you expect a different result from "tiny sheets of graphene flaking off everywhere from nanocoatings" compared to the same flaking from graphite smeared across paper?

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- throwup238 25 minutes ago
  
  Pencil graphite breaks off in very large chunks and when you look at them in a microscope the particle size is in the micrometers. Those particles are too big to easily penetrate cells or deep tissue. You understand correctly about the dust issue.
  Nanosheets are a different story and I’m worried that the graphene produced for industrial applications will be much smaller, flake off much easier in the field as distinct sheets like from abrasion, and stay airborne for longer. In that form they’re likely to behave like asbestos and the evidence is already pretty strong that they do.
  
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marcosdumay 2 hours ago

If we start to have huge amounts of it spread through house objects, than yeah, we can increase people's exposure by a large multiplier and get the known harmful effects we already know about.

That said, I don't think we will ever have large amounts of it in house objects. Graphene doesn't seem to be useful that way. We may have it embedded in some material, but that will limit exposure to waste management and manufacture.

Also, differently from asbestos, graphene is not chemically stable. So very small pieces of it have a limited half-life.

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