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Scientists Create New Material Five Times Lighter and Four Times Stronger Than Steel
(scitechdaily.com)
this post was submitted on 02 Aug 2023
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Always a little annoyed at articles like this; "strength" doesn't tell me anything. If this is 5x more resistant than steel to deformation, but then shatters catastrophically, that limits its use cases substantially. Likewise, compressive, tensile and shear strength are all different properties, only one of which is referenced at all. Still very cool, and I look forward to seeing how it develops and learning more details about its capabilities (when I have more time I'll read the paper), but vague terminology like this has a bad habit of making stuff sound way more revolutionary than it actually is. /shurg
You won't find that level of detail in typical articles, because they are intended for the general public and are intended to be an overview that a layman can comprehend.
However, the paper itself, which the article links to, has more detail including deformation testing.
I told myself I wouldn't read unrelated papers at work, but here we are. :P Yeah, as expected, the actual paper is way more informative about the structural properties, and about the limitations. (Difficulty fabricating larger samples without voids, said voids resulting in much lower strengths and much less plasticity, uncertain tensile strength, etc.) Fascinatingly though, (at least to me, not having known the details about DNA based metamaterials :P) the details of the properties should be tunable by way of changing the DNA lattice structure. Which makes it a two-part engineering problem, figuring out how to manufacture it at scale, and determining optimal lattice structures for different applications. Definitely exciting, and will be big once we figure these things out.
But that's not really what I was talking about. While I get that this is an article geared to laymen/the general public, I do think we should be holding science communication to a higher standard. What was discovered is exciting, but we don't know how it can be used yet, or if it will ever be practical to do so. Overview is fine, I'd just like some more qualifiers and less speculation. Maybe it's just me, but I feel like some more care would do a lot to improve overall scientific literacy and trust in the scientific community. /shurg
I agree with you 100%.
If they are writing using proper materials terminology then strength tells you a lot, since it has a pretty rigorous definition: amount of energy absorbed before failure.
Which, given one of the researchers themselves is quoted talking about its strength, I'm guessing they are even unintentionally being more precise than you're expecting of them.
As for the properties: smaller sections being stronger is fairly normal amongst materials. The smaller a manufactured section, the more catastrophic any given defect will be. At a certain scale, you will be guaranteed to have either perfect, or already failed, material.
Could probably make pretty good ablative armor for vehicles.