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Otot buatan yang dibuat dari sel bawang berlapis emas

Bawang , sayuran .... , membuktikan kekuatannya di luar dunia kuliner - dalam otot buatan yang dibuat dari sel bawang . Tidak seperti otot buatan sebelumnya , yang ini dapat dengan baik memperbesar atau kontraksi  untuk menekuk di arah yang berbeda tergantung pada tegangan yang  diterapkan .......more

Artificial muscles created from
gold-plated onion cells

Date:

May 5, 2015

Source:

American Institute of Physics

Summary:

The onion, a humble root vegetable, is proving its strength outside the
culinary world -- in an artificial muscle created from onion cells. Unlike
previous artificial muscles, this one can either expand or contract to bend in
different directions depending on the driving voltage applied.

.........................

Just one well-placed slice into a particularly pungent onion can send even
the most seasoned chef running for a box of tissues. Now, this humble root
vegetable is proving its strength outside the culinary world as well -- in an
artificial muscle created from onion cells. Unlike previous artificial muscles,
this one, created by a group of researchers from National Taiwan University,
can either expand or contract to bend in different directions depending on the
driving voltage applied. The finding is published this week in the journal Applied Physics Letters, from AIP Publishing.

"The initial goal was to develop an engineered microstructure in
artificial muscles for increasing the actuation deformation [the amount the
muscle can bend or stretch when triggered]," said lead researcher Wen-Pin
Shih. "One day, we found that the onion's cell structure and its
dimensions were similar to what we had been making." Shih lead the study
along with graduate student Chien-Chun Chen and their colleagues.

The onion epidermis -- the fragile skin found just beneath the onion's
surface -- is a thin, translucent layer of blocky cells arranged in a
tightly-packed lattice. Shih and his colleagues thought that onion epidermal
cells might be a viable candidate for the tricky task of creating a more
versatile muscle that could expand or contract while bending. To date, Shih
said, artificial muscles can either bend or contract, but not at the same time.

The researchers treated the cells with acid to remove the hemicellulose, a
protein that makes the cell walls rigid. Then, they coated both sides of the
onion layer with gold. When current flowed through the gold electrodes, the
onion cells bent and stretched much like a muscle.

"We intentionally made the top and bottom electrodes a different
thickness so that the cell stiffness becomes asymmetric from top to bottom,"
said Shih. The asymmetry gave the researchers control over the muscle's
response: a low voltage made them expand and flex downwards, towards the
thicker bottom layer. A high voltage, on the other hand, caused the cells to
contract and flex upwards, towards the thinner top layer.

"We found that the single-layer lattice structure can generate unique
actuation modes that engineered artificial muscle has never achieved
before," said Shih.

To demonstrate their device's utility, the researchers combined two onion
muscles into a pair of tweezers, which they used to pick up a cotton ball. In
the future, they hope to increase the lifting power of their artificial
muscles. "Our next step is to reduce the driving voltage and the actuating
force," said Shih.







Story Source:

The above story is based on materials provided
by American Institute of Physics. Note:
Materials may be edited for content and length.







Journal Reference:

1.   
Chien-Chun Chen, Wen-Pin Shih, Pei-Zen Chang, His-Mei Lai, Shing-Yun Chang,
Pin-Chun Huang and Huai-An Jeng.Onion artificial muscles. Applied
Physics Letters, 2015 DOI: 10.1063/1.4917498

http://www.sciencedaily.com/releases/2015/05/150505121314.htm

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