Para ilmuwan membuat bahan novel
‘kawat cair ' terinspirasi oleh laba-laba
Rahasia
benang laba-laba selalu - kencang mengilhami materi baru
Date:
May 16, 2016
Source:
University of Oxford
Summary:
Mengapa tidak spider's web sag di dalam angin seperti trampolin ? Jawabannya , menurut para ilmuwan , terletak pada fisika di balik bahan ' hybrid ' yang diproduksi oleh laba-laba untuk jaring mereka .
Mengapa tidak spider's web sag di dalam angin seperti trampolin ? Jawabannya , menurut para ilmuwan , terletak pada fisika di balik bahan ' hybrid ' yang diproduksi oleh laba-laba untuk jaring mereka .
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Mengapa spider's web sag di dalam angin seperti trampolin ? Jawabannya , menurut
penelitian baru oleh tim ilmuwan internasional , terletak pada fisika di balik bahan ' hybrid '
yang diproduksi oleh laba-laba untuk jaring mereka .
Menarik mengungkapkan bahwa benang tidak pernah sags tapi selalu tetap kencang - bahkan
ketika membentang ke banyak kali dari panjang aslinya . Hal ini karena setiap benang lepas segera
spooled dalam tetesan kecil lem berair yang melapisi dan mengelilingi serat inti halus jaring
penangkapan spiral .
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Scientists
create novel 'liquid wire' material inspired by spiders' capture silk
Secret of always-taut spider threads inspires new material
Date:
May 16, 2016
Source:
University of Oxford
Summary:
Why doesn't a spider's
web sag in the wind or catapult flies back out like a trampoline? The answer,
according to scientists, lies in the physics behind a 'hybrid' material
produced by spiders for their webs.
..............................
Why doesn't a spider's web sag in the wind or catapult flies back out like
a trampoline? The answer, according to new research by an international team of
scientists, lies in the physics behind a 'hybrid' material produced by spiders
for their webs.
Pulling on a sticky
thread in a garden spider's orb web and letting it snap back reveals that the
thread never sags but always stays taut -- even when stretched to many times
its original length. This is because any loose thread is immediately spooled
inside the tiny droplets of watery glue that coat and surround the core
gossamer fibres of the web's capture spiral.
This phenomenon is
described in the journal PNAS by scientists from the
University of Oxford, UK and the Université Pierre et Marie Curie, Paris,
France.
The researchers
studied the details of this 'liquid wire' technique in spiders' webs and used
it to create composite fibres in the laboratory which, just like the spider's
capture silk, extend like a solid and compress like a liquid. These novel
insights may lead to new bio-inspired technology.
Professor Fritz
Vollrath of the Oxford Silk Group in the Department of Zoology at Oxford
University said: 'The thousands of tiny droplets of glue that cover the capture
spiral of the spider's orb web do much more than make the silk sticky and catch
the fly. Surprisingly, each drop packs enough punch in its watery skins to reel
in loose bits of thread. And this winching behaviour is used to excellent
effect to keep the threads tight at all times, as we can all observe and test
in the webs in our gardens.'
The novel properties
observed and analysed by the scientists rely on a subtle balance between fibre
elasticity and droplet surface tension. Importantly, the team was also able to
recreate this technique in the laboratory using oil droplets on a plastic
filament. And this artificial system behaved just like the spider's natural
winch silk, with spools of filament reeling and unreeling inside the oil
droplets as the thread extended and contracted.
Dr Hervé Elettro, the
first author and a doctoral researcher at Institut Jean Le Rond D'Alembert,
Université Pierre et Marie Curie, Paris, said: 'Spider silk has been known to
be an extraordinary material for around 40 years, but it continues to amaze us.
While the web is simply a high-tech trap from the spider's point of view, its
properties have a huge amount to offer the worlds of materials, engineering and
medicine.
'Our bio-inspired
hybrid threads could be manufactured from virtually any components. These new
insights could lead to a wide range of applications, such as microfabrication
of complex structures, reversible micro-motors, or self-tensioned stretchable
systems.'
Story Source:
The above post is
reprinted from materials provided byUniversity
of Oxford. Note: Materials may be edited for content and length.
Journal Reference:
1.
Hervé Elettro, Sébastien Neukirch, Fritz Vollrath, and Arnaud
Antkowiak. In-drop capillary spooling of spider capture thread inspires
hybrid fibers with mixed solid–liquid mechanical properties. PNAS,
2016 DOI:10.1073/pnas.1602451113