| Unbreakable Glass - Inside Science
Reported September 2005
BACKGROUND: Bell Labs researchers have discovered a sea organism known as the glass sponge uses basic principles much like those found in mechanical engineering textbooks to reinforce its seemingly delicate and brittle structure. Its architecture calls to mind the Eiffel Tower in Paris. Studying such creatures could lead to new concepts in materials science and engineering design.
ABOUT THE GLASS SPONGE: Unlike the squishy manmade sponges we see all the time in our daily lives, sponges are an ancient group of animals whose presence in the fossil record goes back more than half a billion years. Sponges may be groups of collaborating individual cells rather than one unified animal, since they don't form tissues. This means they don't have hearts, lungs or other organs, but they are capable of creating some of the most complex and diverse systems of skeletons known in nature.
The glass sponge is made entirely of glass, spun into delicate fibers. It can even emit light despite the darkness of deep sea levels, thanks to the presence of fluorescent bacteria embedded in its structure. The intricate glass cages of the sponge have at least seven levels of structural organization. The creatures use fiber-reinforced cements, beams of bundled fibers, and diagonal reinforcement beams running at 45-degree angles to achieve maximum strength and stability. The glass beams, which resemble small needles, are made of alternating layers of glass and glue; the glue between each glass layer prevents cracks from spreading from one layer to the next. Wherever the beams intersect, more glue is added to toughen the connection.
WHAT WE COULD LEARN: By studying the glass sponge, scientists could learn how to create a strong material out of something that seems to be frail. It may also hold the secret to making glass at room temperature, instead of the extremely high temperatures required to do so today. Researchers believe that the individual glass fibers in the sponge are formed by a protein at the center of each glass filament.
ON THE WEB :
The American Society of Civil Engineers contributed to the information contained in the TV portion of this report.
If you would like more information, please contact:
The American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, Virginia 20191-4400
(800) 548-2723
http://www.asce.org |
FACTOID...
Glass sponges -- sometimes called "Venus' flower baskets" because the Roman goddess Venus is often shown holding a basket of flowers -- were once a popular wedding gift in Japanese culture because of their delicate beauty.
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