Comment Re:This will revolutionize igloo construction (Score 4, Interesting) 41
It's not about the specific "BioPykrete" example, it's the technique that's interesting: using proteins to bridge dissimilar materials in composites. It's using them in a way that's sort of like how an emulsifier lets you bridge lipophilic and hydrophilic compounds
Think, say, plastic-ceramic or plastic-metal composites. We can do these today (say, Colorfabb Bronzefill 3d printing filament), but the addition of ceramic or metallic particles makes the material properties generally worse, not better. The plastic just does not bond well to the particles; you have to significantly limit the percentage of metal or ceramic in your mix, and it makes them much harder to work. But what if they *did* bound well? You could easily produce materials with significantly boosted strength, abrasion resistance, etc, but with the low-temperature workability of plastics (note: they'd probably have to be thermoset, not thermoplastic, or low-temperature thermoplastics; proteins have heat survivability limits)
And why stop at metals and ceramics? You could literally just use "dust", just ordinary mineral dusts (clays, silt, etc) as a bulk filler in plastics, yet instead of ending up with a weaker product than working with pure plastic, you'd end up with a stronger one.
Maybe you don't even need a plastic. Maybe you can do what they're doing and bridge cellulose to an inorganic material? Then you're *really* operating on waste. Ice has the advantage of a low melting point in this situation, letting you use that component as a fluid - but cellulose can be dissolved in a number of substances, so perhaps you mix a cellulose-protein slurry with metal or mineral powders and then vaporize/recover the solvent?
Or even forgetting "novel" products, what about conventional composites? If you can bridge high-tensile fibres (such as carbon fibre) better to the polymer matrix that they're in, then you can help eliminate one of the main failure mechanisms of said composites, as well as making the behavior far more predictable. Because like metals (and unlike ceramics), a protein-bridged compound shouldn't be brittle; breaking one bond shouldn't introduce a discontinuity (like a ceramic), it should just reconnect after breakage (like a metal). Such composites should have ductility.
I don't know how widely applicable this will be, but technology that helps bridge dissimilar compounds is nothing to scoff at. And today we have tools like AlphaFold to assist with the design
As for the caveats:
* The concept of coupling agents is also not new, we already use various coupling agents to bond plastic to metal particles in metal-plastic composites and the like - they're just not great at their jobs.
* The aforementioned temperature limits
* Potential production challenges (though industrial enzymes are as cheap as like $15-50/kg, so seems viable?)
* Other coupling agents may offer better advantages; it's not a static field.