Carbon nanotube-based biomimetic material with micro-nano branch structure and preparation method for same
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A technology of carbon nanotubes and branched structures, applied in the field of bionic materials, to achieve the effects of overcoming structural damage, high mechanical strength, and high aspect ratio
Inactive Publication Date: 2014-01-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0005] The object of the present invention is, aiming at the deficiencies in the prior art, propose a kind of carbon nanotube-based biomimetic dry adhesive material with micro-nano branch structure and its The preparation method realizes the smooth transition of carbon nanotube-based biomimetic dry adhesion materials from nanometer to micrometer scale, so as to solve the problem of structural damage caused by bending deformation of carbon nanotubes during the adhesion process
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Embodiment 1
[0021] (1) Ultrasonic cleaning of single-crystal Si substrates with ethanol and acetone, respectively;
[0022] (2) Using radio frequency magnetron sputtering to deposit Ni catalyst layer on the surface of Si substrate, the specific experimental parameters are that the background vacuum is less than 10 -4 Pa, sputtering pressure 0.5Pa, RF power 50W, sputtering time 10s.
[0023] (3) Put the Si substrate on which the catalyst is deposited into the CVD chamber, and evacuate to less than 10 -4 Pa, the temperature was raised to 800 °C, and CH was introduced 4 as carbon source H 2 is the carrier gas, CH 4 :H 2 =20:100, the pressure is increased to 1000Pa, the growth time is 30 minutes, and the carbon nanotube array is obtained, such as figure 1 (a). It is measured by scanning electron microscope that the height of the carbon nanotube array is 45 micrometers, and the diameter of a single carbon nanotube is 6-8 nanometers measured by transmission electron microscope.
[0024]...
Embodiment 2
[0031] (1) Ultrasonic cleaning of single-crystal Si substrates with ethanol and acetone, respectively;
[0032] (2) Using radio frequency magnetron sputtering to deposit Ni catalyst layer on the surface of Si substrate, the specific experimental parameters are that the background vacuum is less than 10 -4 Pa, sputtering pressure 0.5Pa, RF power 50W, sputtering time 10s.
[0033] (3) Put the Si substrate on which the catalyst is deposited into the CVD chamber, and evacuate to less than 10 -4 Pa, the temperature rises to 800 ℃, pass C 2 H 2 As the carbon source Ar is the carrier gas, C 2 H 2 : Ar=30:100, the pressure is increased to 500Pa, the growth time is 30 minutes, and the patterned carbon nanotube array is obtained.
[0034] (4) Put the carbon nanotube array on the glue machine to fix it, drop liquid PDMS with a viscosity of 300 mPas on the surface, and let it stand for 2 minutes. Under the action of capillary force, PDMS penetrates into the carbon nanotube array to f...
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Abstract
The invention relates to a biomimetic material technology, and in particular relates to a carbon nanotube-based biomimetic material with a micro-nano branch structure and a preparation method for the same. The material comprises a carbon nanotube array formed by combining carbon nanotubes with a high-molecular material, wherein the top end of the array is the nanoscale carbon nanotubes, the root of the array is the carbon nanotubes surrounded by the high-molecular material, a microscale composite structure formed by the interpenetration of the high-molecular material and the carbon nanotubes is arranged between the root and the top end, and the diameter of the microscale composite structure is gradually reduced to nanoscale from microscale; and the high-molecular material is a high-molecular polymer with a thermocuring characteristic or a photocuring characteristic. The preparation method comprises the following steps of preparing a carbon nanotube array on a monocrystal Si substrate, then covering a high-molecular material liquid on the top end of the carbon nanotube array, and then completely curing the high-molecular material by virtue of heating or illumination; and finally removing the high-molecular material to obtain the carbon nanotube-based biomimetic material with the micro-nano branch structure. The material is capable of effectively overcoming a structural damage problem caused by the bending deformation of the carbon nanotubes during an adhesion process.
Description
Technical field: [0001] The invention relates to bionic material technology, and also to the field of bionic robot technology, in particular to a carbon nanotube-based bionic dry adhesive material with a micro-nano branch structure and a preparation method thereof. Background technique: [0002] After years of research, scientific and technical personnel have found that geckos can easily crawl on vertical walls, ceilings and various surfaces. Surface contact produces approximately 10N / cm 2 of adhesion. In 2000, Autumn and Full et al. reported on page 681 of volume 405 of Nature that the special adhesive force on gecko toes mainly comes from the accumulation of van der Waals forces produced by the bristle array on the toes. Gecko toe setae have a cross-scale micro-nano branch structure: the micron-scale setae at the root undergo multi-level bifurcations and finally form the nanostructure at the top. The nanostructure at the top can provide more contact points, which grea...
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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00B82Y40/00C01B32/168
Inventor 赵爱武李达梅涛
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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