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Method for controlling rotation of liquid drops after collision

A technology of rotating motion and controlling fluid, which is applied in fluid dynamics tests, testing of machine/structural components, measuring devices, etc., and can solve problems such as rough adjustment and inability to control precisely

Inactive Publication Date: 2019-08-02
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Controlling the movement behavior of droplets after collision mainly includes building macroscopic physical structures on the substrate surface (references: J. C. Bird, R. Dhiman, H. Kwon, K. K. Varanasi, Nature2013, 503, 385-388; Y. Liu, M. Andrew , J. Li, J. M. Yeomans, Z. Wang, Nat.Commun. 2015, 6, 10034; G. Anais, S. Sean, Clanet, Christophe, Q. David, Nat.Commun. 2015, 6, 8001), preparation Substrates with special microstructures (References: Y. Liu, M. Lias, X.Xu, T. Qian, J. M. Yeomans, Z. Wang, Nat. Phys. 2014, 10, 515-519; J. Li, Y. Hou, Y. Liu, C. Hao, M. Li, M. K. Chaudhury, S. Yao, Z. Wang, Nat. Phys.2016, 12, 606-612), tuning droplet composition (ref: V. Bergeron , Boon, J. Y. Martin, L. Vovelle, Nature 2000, 405, 772-775; M. Song, J. Ju, S. Luo, Y. Han, Z. Dong, Y. Wang, Z. Gu, L. Zhang , R. Hao, L. Jiang, Sci. Adv. 2017, 3, e1602188). However, at present, the adjustment of the droplet rebound behavior is relatively rough, only the adjustment of the rebound direction, that is, before and after the droplet hits the substrate. Linear velocity and cannot be precisely controlled

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  • Method for controlling rotation of liquid drops after collision

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Control the rotation and rebound behavior of water droplets after impact. The single crystal silicon wafer is cleaned, and the specific steps are as follows: ultrasonically clean the silicon wafer with acetone, ethanol and deionized water respectively. Then soak in 5% hydrofluoric acid aqueous solution for 3 minutes, 24% hydrofluoric acid / 0.5% silver nitrate mixed solution for 3 minutes, and 24% hydrofluoric acid / 5% hydrogen peroxide mixed solution for 2 hours. After taking it out, blow it dry with ultra-pure nitrogen, then immerse the single crystal silicon wafer in a methanol solution with a concentration of 1% 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane, let it stand for 5 minutes, and then use Drying with ultra-pure nitrogen, the obtained substrate has the properties of super-hydrophobic and ultra-low adhesion. A metal hollow mask is covered on the substrate, and a selective exposure treatment is carried out with an ultraviolet lamp. The area irradiated by light ...

Embodiment 2

[0026] The rotating droplet drives the substrate to rotate. Preparation of high-adhesion / hydrophobic-low-adhesion substrates: Ultra-thin aluminum sheets with a thickness of 50 μm were ultrasonically cleaned with acetone, ethanol and deionized water in sequence, and then dried with high-purity nitrogen. Prepare Baker's solution: Mix 40 mL of concentrated hydrochloric acid, 2.5 mL of hydrofluoric acid, and 12 mL of deionized water. Immerse the aluminum piece in Baker's solution, take it out after 10 seconds, rinse it with deionized water quickly, and blow it dry with high-purity nitrogen. Place the aluminum sheet in a clean glass vacuum desiccator, place a glass slide in it, drop a drop of octadecyltrichlorosilane on the glass slide with a dropper, evacuate it with a vacuum pump for 30 minutes, and then place it at 80 Stand still in the forced air drying oven at 100°C for 2 hours. After the treatment, the contact angle of the aluminum sheet is 165 degrees, and the adhesion for...

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Abstract

The invention discloses a method for controlling rotation of liquid drops after collision, and belongs to the technical field of material interface infiltration. According to the method, patterning infiltration modification is performed on the surface of an object, liquid drops are controlled to be collided with a high-viscosity / hydrophobic low-viscosity substrate at a certain speed, and a controllable rotation rebounding behavior can be formed after the liquid drops are collided by controlling the viscosity difference between different regions of the substrate, the symmetry of a substrate pattern and the collision speed of the liquid drops. Through adoption of the method for controlling rotation of liquid drops after collision disclosed by the invention, the translational kinetic energy of the liquid drops can be transformed into rotational kinetic energy, mutual transformation among different energy forms is realized, and the research category of the Newton impact law is broken. Therotational kinetic energy of the liquid drops can be used for driving a substance to rotate directionally, and a new thought and a research basis are provided for novel hydroelectric generation. The method for controlling the rotation rebounding of the liquid drops can be applied to energy collection and transformation, substance driving, substance mixing and the like.

Description

technical field [0001] The invention belongs to the technical field of material interface infiltration, and in particular relates to a method and application for controlling the rotational motion of droplets after collision. Background technique [0002] Controlling the movement behavior of droplets hitting the substrate surface has broad application prospects in the fields of anti-icing, 3D printing, inkjet printing, self-cleaning, and high-temperature heat transfer. Controlling the movement behavior of droplets after collision mainly includes building macroscopic physical structures on the substrate surface (references: J. C. Bird, R. Dhiman, H. Kwon, K. K. Varanasi, Nature2013, 503, 385-388; Y. Liu, M. Andrew , J. Li, J. M. Yeomans, Z. Wang, Nat.Commun. 2015, 6, 10034; G. Anais, S. Sean, Clanet, Christophe, Q. David, Nat.Commun. 2015, 6, 8001), preparation Substrates with special microstructures (References: Y. Liu, M. Lias, X.Xu, T. Qian, J. M. Yeomans, Z. Wang, Nat. Ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 李会增宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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