Nano tape, also called gecko tape; marketed under the name Insanity Tape, is a synthetic adhesive tape consisting of arrays of carbon nanotubes transferred onto a backing material of flexible polymer tape. These arrays are called synthetic setae and mimic the nanostructures found on the toes of a gecko; this is an example of biomimicry. The adhesion is achieved not with chemical adhesives, but via van der Waals forces, which are weak electric forces generated between two atoms or molecules that are very close to each other. So far there is little evidence to support nano tape being recyclable in the same way as plastic bottles, but it is reusable. More data is needed to know how environmentally safe nano tape is.[1][2]
Commercially available nano tape.Nano tape used to hang household items.
Geckos show a remarkable ability to climb smooth vertical surfaces at high speeds, exhibiting both strong attachment and easy rapid removal, or shear adhesion, of their feet.[3]
On a gecko's foot, micrometer-sized elastic hairs called setae are split into nanometer-sized structures called spatulas. The shear adhesion is achieved by forming and breaking van der Waals forces between these microscopic structures and the substrate.[4]
Nano tapes mimic these structures with carbon nanotube bundles, which simulate setae, and individual nanotubes, which simulate spatulas, to achieve macroscopic shear adhesion and to translate the weak van der Waals interactions into high shear forces. The shear adhesion allows the tape to be easily peeled off, in the manner a gecko lifts its foot. Since the carbon nanotube arrays leave no residue on the substrate, the tape can be reused many times.[5]
Historyedit
Nano tape is one of the first developments of synthetic setae, which arose from a collaboration between the Manchester Centre for Mesoscience and Nanotechnology, and the Institute for Microelectronics Technology in Russia. Work started in 2001 and two years later results were published in Nature Materials.[6]
The group prepared flexible fibers of polyimide as the synthetic setae structures on the surface of a 5 μm thick film of the same material using electron beam lithography and dry etching in an oxygen plasma. The fibres were 2 μm long, with a diameter of around 500 nm and a periodicity of 1.6 μm, and covered an area of roughly 1 cm2 (see figure on the left). Initially, the team used a silicon wafer as a substrate, but found that the tape's adhesive power increased by almost 1,000 times if they used a soft bonding substrate such as Scotch tape. This is because the flexible substrate yields a much higher ratio of the number of setae in contact with the surface over the total number of setae.[citation needed]
The result of this "gecko tape" was tested by attaching a sample to the hand of a 15 cm high plastic Spider-Man figure weighing 40 g, which enabled it to stick to a glass ceiling, as is shown in the figure. The tape, which had a contact area of around 0.5 square centimetres (50 mm2) with the glass, was able to carry a load of more than 100 grams (3.5 oz). However, the adhesion coefficient was only 0.06, which is low compared with real geckos (8~16).[citation needed]
Commercial useedit
Commercial nano tape is usually sold as double-sided tape that is useful for hanging lightweight items such as pictures and decorative items on smooth walls without punching holes in the wall. Using superaligned carbon nanotubes, some nano tapes can stay sticky in extreme temperatures. [2]
^Autumn, Kellar; Gravish, Nick (2008-05-13). "Gecko adhesion: evolutionary nanotechnology". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 366 (1870): 1575–1590. Bibcode:2008RSPTA.366.1575A. doi:10.1098/rsta.2007.2173. PMID 18192170. S2CID 16412336.
^Ge, Liehui; Sethi, Sunny; Ci, Lijie; Ajayan, Pulickel M.; Dhinojwala, Ali (2007-06-26). "Carbon nanotube-based synthetic gecko tapes". Proceedings of the National Academy of Sciences. 104 (26): 10792–10795. Bibcode:2007PNAS..10410792G. doi:10.1073/pnas.0703505104. PMC1904109. PMID 17578915.
nano, tape, also, called, gecko, tape, marketed, under, name, insanity, tape, synthetic, adhesive, tape, consisting, arrays, carbon, nanotubes, transferred, onto, backing, material, flexible, polymer, tape, these, arrays, called, synthetic, setae, mimic, nanos. Nano tape also called gecko tape marketed under the name Insanity Tape is a synthetic adhesive tape consisting of arrays of carbon nanotubes transferred onto a backing material of flexible polymer tape These arrays are called synthetic setae and mimic the nanostructures found on the toes of a gecko this is an example of biomimicry The adhesion is achieved not with chemical adhesives but via van der Waals forces which are weak electric forces generated between two atoms or molecules that are very close to each other So far there is little evidence to support nano tape being recyclable in the same way as plastic bottles but it is reusable More data is needed to know how environmentally safe nano tape is 1 2 Commercially available nano tape Nano tape used to hang household items Contents 1 Explanation 2 History 3 Commercial use 4 Gallery 5 ReferencesExplanation editGeckos show a remarkable ability to climb smooth vertical surfaces at high speeds exhibiting both strong attachment and easy rapid removal or shear adhesion of their feet 3 On a gecko s foot micrometer sized elastic hairs called setae are split into nanometer sized structures called spatulas The shear adhesion is achieved by forming and breaking van der Waals forces between these microscopic structures and the substrate 4 Nano tapes mimic these structures with carbon nanotube bundles which simulate setae and individual nanotubes which simulate spatulas to achieve macroscopic shear adhesion and to translate the weak van der Waals interactions into high shear forces The shear adhesion allows the tape to be easily peeled off in the manner a gecko lifts its foot Since the carbon nanotube arrays leave no residue on the substrate the tape can be reused many times 5 History editNano tape is one of the first developments of synthetic setae which arose from a collaboration between the Manchester Centre for Mesoscience and Nanotechnology and the Institute for Microelectronics Technology in Russia Work started in 2001 and two years later results were published in Nature Materials 6 The group prepared flexible fibers of polyimide as the synthetic setae structures on the surface of a 5 mm thick film of the same material using electron beam lithography and dry etching in an oxygen plasma The fibres were 2 mm long with a diameter of around 500 nm and a periodicity of 1 6 mm and covered an area of roughly 1 cm2 see figure on the left Initially the team used a silicon wafer as a substrate but found that the tape s adhesive power increased by almost 1 000 times if they used a soft bonding substrate such as Scotch tape This is because the flexible substrate yields a much higher ratio of the number of setae in contact with the surface over the total number of setae citation needed The result of this gecko tape was tested by attaching a sample to the hand of a 15 cm high plastic Spider Man figure weighing 40 g which enabled it to stick to a glass ceiling as is shown in the figure The tape which had a contact area of around 0 5 square centimetres 50 mm2 with the glass was able to carry a load of more than 100 grams 3 5 oz However the adhesion coefficient was only 0 06 which is low compared with real geckos 8 16 citation needed Commercial use editCommercial nano tape is usually sold as double sided tape that is useful for hanging lightweight items such as pictures and decorative items on smooth walls without punching holes in the wall Using superaligned carbon nanotubes some nano tapes can stay sticky in extreme temperatures 2 Gallery edit nbsp Gecko climbing a glass surface nbsp Close view of a gecko s foot nbsp Micro and nano view of gecko s toe nbsp Micro view of nano tape 6 nbsp Spider Man test of nano tape 6 References edit Bourzacarchive Katherine 2008 10 09 Sticky Nanotape MIT Technology Review a b Nanowerk News 2019 07 10 Carbon nanotube tape stays sticky in extreme temperatures Nanowerk Newsletter American Chemical Society Autumn Kellar 2006 01 01 How Gecko Toes Stick American Scientist 94 2 124 doi 10 1511 2006 58 124 Autumn Kellar Gravish Nick 2008 05 13 Gecko adhesion evolutionary nanotechnology Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences 366 1870 1575 1590 Bibcode 2008RSPTA 366 1575A doi 10 1098 rsta 2007 2173 PMID 18192170 S2CID 16412336 Ge Liehui Sethi Sunny Ci Lijie Ajayan Pulickel M Dhinojwala Ali 2007 06 26 Carbon nanotube based synthetic gecko tapes Proceedings of the National Academy of Sciences 104 26 10792 10795 Bibcode 2007PNAS 10410792G doi 10 1073 pnas 0703505104 PMC 1904109 PMID 17578915 a b c Geim A K Dubonos S V Grigorieva I V Novoselov K S Zhukov A A and Shapoval S Y 2003 Microfabricated adhesive mimicking gecko foot hair Nature Materials v 2 pp 461 3 Retrieved from https en wikipedia org w index php title Nano tape amp oldid 1215546225, wikipedia, wiki, book, books, library,
