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  • hello......
  • nice discussion and from nice group
    let me give a brief on on of the famous model which clear how the nature influence in our mind :
    The Mathematical model of floret arrangement

    A model for the pattern of florets in the head of a sunflower was proposed by H Vogel in 1979.
    This is expressed in polar coordinates

    r = c \sqrt{n},
    θ = n \times 137.5^{\circ},

    where θ is the angle, r is the radius or distance from the center, and n is the index number of the floret and c is a constant scaling factor.

    It is a form of Fermat's spiral. The angle 137.5° is related to the golden ratio and gives a close packing of florets. This model has been used to produce computer graphics representations of sunflowers.

    By this idea and this subject I open SACRED NANO GROUP

    you are invited by simply clicking : here
    God is the great inspiring to all Nano researchers,visionaries,and engineers. The group will adapt from our creator to inspire ideas and discuss how…
  • Gecko Inspires Directional and Controllable Adhesion
    23 January 2009, 09:38

    Categories: adhesives biomimicry

    Back in 2006, a team at Carnegie Mellon made flat, mushroom-shaped tips that mimic the spatula of a gecko’s foot. The tips achieved the same sticking force as a gecko, but there was no easy way to get the tips to release their grip. The team later realized that the key to controlling stickiness lay in changing the angle of the spatula.

    So the researchers recently took the tips and placed them on top of polymer fibers, angling them at approximately 28 degrees to mimic the construction of a gecko’s foot. As pressure is applied in the direction of the angled fibers, the contact area between each spatula and an object increases, increasing the sticking power of their novel adhesive. Tugging in the opposite direction reduces the contact area and makes the forces of attraction decrease, so that the “gecko tape” can be more easily released.

    The group’s adhesive was able to hold a one-kilogram weight when pressure was applied in the direction of the angled fibers. A 300-gram weight pulling in the opposite direction was enough to release the tape’s grip. The researchers have detailed their results in a recent issue of Small.
  • in the name of God
    this text is a large meaning say about God.
    لا حول و لا قوه الا با الله means any turning and any energy come from Allah.
    this sentences can be understood when you see evens about you.
    I help you to a better understanding about this sentences.
    لا حول و لا قوه الابا لله
    means any movement, any change, any turn, any birth, any making , any waking up, any relation is under the God' power.
    for human, we do any work by our hand, God give us the order and tools for doing and anything for doing a particular work. but when we see ourselves, we can't see any of our body segments(big or tiny at any level) that we create or make for us.
    God making is over of any created by human.

    some of Quran sentences:
    1- O mankind! A similitude has been coined, so listen to it (carefully): Verily! Those on whom you call besides Allah, cannot create (even) a fly, even though they combine together for the purpose. And if the fly snatched away a thing from them, they would have no power to release it from the fly. So weak are (both) the seeker and the sought.

    2- They have not estimated Allah His Rightful Estimate; Verily, Allah is All-Strong, All- Mighty.

    If you want to identify Allah read this sentenses.
    Hadid (means Fe)1-6
    1-In the name of God, Most Gracious, Most Merciful
    Whatsoever is in the heavens and the earth glorifies Allah, and He is the All-Mighty, All- Wise.
    His is the kingdom of the heavens and the earth, It is He Who gives life and causes death; and He is Able to do all things.
    He is the First (nothing is before Him) and the Last (nothing is after Him), the Most High (nothing is above Him) and the Most Near (nothing is nearer than Him). And He is the All-Knower of every thing.
    He it is Who created the heavens and the earth in six Days and then Istawa (rose over) the Throne (in a manner that suits His Majesty). He knows what goes into the earth and what comes forth from it, what descends from the heaven and what ascends thereto. And He is with you (by His Knowledge) wheresoever you may be. And Allah is the All-Seer of what you do.
    His is the kingdom of the heavens and the earth. And to Allah return all the matters (for decision).
    He merges night into day (i.e. the decrease in the hours of the night is added into the hours of the day), and merges day into night (i.e. the decrease in the hours of the day is added into the hours of the night), and He has full knowledge of whatsoever is in the breasts.
    and you know why this God is owner of any doing.
  • Assembling Spider Silk
    A new microfluidics device that works like a spider’s silk duct might finally lead the way to producing industrial quantities of high-quality artificial spider silk. Spider silk is super-light, super-strong and elastic too. Existing human materials lack its useful combination of properties, and proposed uses span everything from bulletproof vests to optic fibres. Researchers have struggled for years to find an industrial process to make spider silk, and have tried everything from making it in a lab dish to creating silk-secreting goats.

    Now a group of researchers at the Technical University of Munich and the University of Bayreuth, Germany, has demonstrated a new method of production – an artificial version of the ducts spiders use to “spin” the silk. The artificial duct is a glass microfluidic chip shot through with tiny tubes. Inside the chip, two proteins found in silk from the European garden spider (_Araneus diadematus_) – known as ADF3 and ADF4 – flow along tiny tubes and are exposed to a phosphate salt solution that makes them aggregate into tiny spheres 1 to 5 micrometres across. A sudden jump in acidity and phosphate concentration then partially breaks open the spheres, allowing the proteins to latch together into chains. At this point, the flow speed increases and draws out the proteins into long silk fibres.
  • MWCNT Gecko Tapes
    25 March 2008, 12:18

    Categories: adhesives biomimicry

    Researchers at the University of Akron and Rensselaer have demonstrated a new type of self-cleaning adhesive: a carbon nanotube-based, flexible gecko tape.
    The multi-wall carbon nanotubes (MWCNTs) have a length of 100 µm and an average diameter of 8 nm (2-5 walls); they are held by a polymeric glue at the base and this does not allow individual structures to collapse due to capillary forces.
    “To demonstrate the self-cleaning ability of the synthetic tapes, we soiled these tapes with silica particles – to represent dust – ranging from 1 to 100 µm in size. When rinsed with water, the water droplets roll off very easily, carrying with them most of the silica particles” says Dr. Ali Dhinojwala. “If you want to use these tapes in robotics, we cannot just test them on clean glass. They need to work in real dusty environments. In addition, the important element of the gecko design is reversibility and this cannot be achieved without some aspect of self-cleaning. Therefore we envisage their is a broad spectrum of applications including robotics, space applications, electronics, and sports.”
  • Sticking With Ivy
    biomimicry adhesives

    In addition to geckoes and insects, scientists have started looking at plants to identify biological climbing mechanisms that could be exploited for engineering applications. One obvious candidate is ivy, a climbing woody plant. Researchers now have found that ivy secretes nanoparticles which allow the plant to affix to a surface and play an important role in the plant’s climbing capability.

    Mingjun Zhang, an Associate Professor at the University of Tennessee, is first author of a recent paper in Nano Letters where he, together with collaborators from the university as well as Agilent Technologies, observed that ivy secretes large numbers of nanoparticles from tendrils of the adhering disk. This ivy secretion mechanism may inspire new, ‘green’ methods for synthesizing nanoparticles biologically or new approaches to adhesion mechanisms for mechanical devices.

    “It is fascinating how plants make use of nanotechnology for their livelihood,” comments Jeffrey M. Karp, a biomaterials and nanotechnology expert at Harvard Medical School. “Clearly this work provides an opportunity for inspiration that can be applied to solving human problems through biomimetic approaches. Although it is still early, harnessing nanoparticles capable of similar levels of adhesion through hydrogen-bonding mechanisms could be useful to design new industrial and medical adhesives.”


  • Who Knows what's relation between Nano & Olympic?
    I'll give the answer in Nano
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