Researchers in Malaysia have developed a bio-based composite material that improves strength and stiffness and reduces weight by substituting coconut fibers for traditional ceramic fibers in biocomposite tiles.
Thanks Ann for this intersting article highlighting these two studies.
Before the wonder fabric known as nylon came on the scene, there was a lot of development of fabrics made from natural sources such as milk fiber, hemp and even coconut. We're dusting off some of the old research. With more modern technology and processes, I think we'll see some very intersting results.
Nadine, thanks for the history--I didn't realize that this type of modern research, i.e., materials made from natural sources, had a previous phase. Maybe it's my studies in anthropology way back when, but I've always been interested in how people experiment with the natural materials in their immediate environment for an astounding range of uses.
Dr. Pradeep Rohatgi, who is best known for his work on metal-matrix composites, also did significant work on natural fiber composites, including coconut, banana, and sisal. This kind of technology could play an important role in reducing poverty in developing countries. Instead of relying on expensive materials imported from industrialized countries, indigenous materials could be used.
Besides, many biological materials have properties which rival those of the best synthetic materials, often at a significantly lower cost. A lot of money is being spent on research to develop multifunctional, nano-structured materials, but nature has a big head start on us (about four billion years).
I had heard about this use of coconut fibers recently, but not any details. Thanks for the article. Once again nature provides. I'd like to think that we're heading into an era where nature is viewed as a cooperative ally rather than something to be overcome. Efforts like this move us in the right direction.
@Scott Orlosky: You raise a good point -- our attitudes about natural products speak to our overall relationship with nature.
In the developed world, there is often a bias against the use of natural products in industry. For example, we often use wool grease (which, as the name indicates, is a mixture of long chain fatty acid esters extracted from the wool of sheep) as a lubricant for fasteners.
When I describe this product to people, they often react in disgust or derision -- even though some of them may regularly use skin care products containing lanolin, which is actually just highly-refined wool grease. But when it comes to industrial wool grease, they see it as a "gross" product, and have a hard time believing that it is still being used in the 21st century.
The same people tend not to have the same reaction to solid film lubricants or petroleum-based lubricants. (This is especially interesting when you consider how most urban people react when they drive past a sheep pasture, compared to an oil refinery).
On the other hand, in developing countries, indigenous materials are often considered to be inferior to synthetic materials imported from abroad. There is a common prejudice, especially among the educated classes, that imported products are always better than national products, and that traditional national products are little better than garbage (even though foreign tourists may pay large sums of money for traditional products, or at least facimilies thereof).
These attitudes are largely unconscious and mostly irrational, but I would argue that they play a significant role in material selection.
Dave, thanks for that background on research into natural fiber composites. I agree on the local use of local materials to reduce costs. After all, that's what people did before the industrial revolution: use what's at hand.
Excellent points. I hadn't considered the "general attitude" aspect of material selection. Sounds like it would take a significant re-education effort to undo those biases. The more we understand the natural origins of materials the more likely we are to respect and protect them.
Scott, your earlier comment "I'd like to think that we're heading into an era where nature is viewed as a cooperative ally rather than something to be overcome." is intriguing. I also hope we are recapturing an understanding that most humans once had for many thousands of years until recently in our history: seeing ourselves as an integral part of the natural world, one that we can look to for inspiration and resources.
Artificially created metamaterials are already appearing in niche applications like electronics, communications, and defense, says a new report from Lux Research. How quickly they become mainstream depends on cost-effective manufacturing methods, which will include additive manufacturing.
SpaceX has 3D printed and successfully hot-fired a SuperDraco engine chamber made of Inconel, a high-performance superalloy, using direct metal laser sintering (DMLS). The company's first 3D-printed rocket engine part, a main oxidizer valve body for the Falcon 9 rocket, launched in January and is now qualified on all Falcon 9 flights.
Lawrence Livermore National Laboratory and MIT have 3D-printed a new class of metamaterials that are both exceptionally light and have exceptional strength and stiffness. The new metamaterials maintain a nearly constant stiffness per unit of mass density, over three orders of magnitude.
Smart composites that let the material's structural health be monitored automatically and continuously are getting closer to reality. R&D partners in an EU-sponsored project have demonstrated what they say is the first complete, miniaturized, fiber-optic sensor system entirely embedded inside a fiber-reinforced composite.
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