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Photothermal directional control elastic superhydrophobic surface liquid drop migration device and using method thereof

A super-hydrophobic surface and droplet technology, applied in the field of microfluidics, can solve problems such as lack of research, and achieve the effects of simple manufacturing process, low control cost, and easy integration.

Inactive Publication Date: 2019-05-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many studies on photothermal conversion materials and surface modification to control droplet behavior, but based on the combination of photothermal conversion materials and plastic materials, the research on the use of elastic deformation to realize droplet migration on superhydrophobic surfaces is still relatively scarce.

Method used

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  • Photothermal directional control elastic superhydrophobic surface liquid drop migration device and using method thereof
  • Photothermal directional control elastic superhydrophobic surface liquid drop migration device and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see figure 1 and figure 2 , Embodiment 1: A light-thermal directional control elastic superhydrophobic surface droplet migration device, including a substrate 1; the substrate 1 is mixed and solidified by polydimethylsiloxane PDMS and endothermic material titanium dioxide powder The base 1 can also be formed by mixing and solidifying polydimethylsiloxane PDMS and endothermic material ferric oxide powder; or by mixing polydimethylsiloxane PDMS with other endothermic materials and solidified. The surface of the substrate 1 is engraved or sprayed with a transparent super-hydrophobic layer 2 , and a 532nm green laser 3 is arranged above the transparent super-hydrophobic layer 2 .

[0023] In a specific embodiment, the substrate 1 is formed by mixing polydimethylsiloxane and heat-absorbing material titanium dioxide powder or ferric iron tetroxide powder in a ratio of 100:3 to 100:13 and solidified. Specifically, polydimethylsiloxane: curing agent: heat-absorbing material...

Embodiment 2

[0024] see figure 1 and figure 2 , Embodiment 2. The use method of photothermal directional control elastic superhydrophobic surface droplet migration device, this method comprises the following steps:

[0025] A. Pour polydimethylsiloxane into a mold with regular shape, add curing agent and heat-absorbing material titanium dioxide powder, stir evenly and let it stand for about 20 minutes to remove the air bubbles, then place the mold on Heat on a heating plate at a temperature of 100° C.±10° C. for 15-20 minutes to cure, and obtain a substrate 1 .

[0026] B. A transparent superhydrophobic layer 2 is formed on the surface of the substrate 1 by template engraving or transparent superhydrophobic paint spraying method.

[0027] C. Setting a 532nm green laser 3 above the transparent superhydrophobic layer 2 .

[0028] D. Turn on the laser 3, the dititanium oxide in the substrate 1 performs light-to-heat conversion and transfers the heat to the polydimethylsiloxane PDMS, and t...

Embodiment 3

[0030] Embodiment 3: The method for using the liquid droplet migration device on the elastic superhydrophobic surface controlled by photothermal orientation, the method comprises the following steps:

[0031] A. Pour polydimethylsiloxane into a mold with regular shape, add curing agent and endothermic material ferric oxide powder, stir evenly and let it stand for 20 minutes to remove the air bubbles, then place the mold at temperature Heating on a heating plate at 100° C.±10° C. for 15-20 minutes for curing to obtain a substrate 1 .

[0032] B. A transparent superhydrophobic layer 2 is formed on the surface of the substrate 1 by template engraving or transparent superhydrophobic paint spraying method.

[0033] C. Setting a 532nm green laser 3 above the transparent superhydrophobic layer 2 .

[0034] D. Turn on the laser 3, the ferroferric oxide in the substrate 1 performs light-to-heat conversion and transfers heat to polydimethylsiloxane PDMS, and the polydimethylsiloxane PD...

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Abstract

The invention discloses a photothermal directional control elastic superhydrophobic surface liquid drop migration device and a using method thereof. The photothermal directional control elastic superhydrophobic surface liquid drop migration device comprises a substrate, and is characterized in that the substrate is formed by mixing polydimethylsiloxane and heat absorbing material titanium dioxidepowder or ferroferric oxide powder, a transparent superhydrophobic layer is etched or sprayed on the surface of the substrate, and a green laser is arranged above the transparent superhydrophobic layer. According to the photothermal directional control elastic superhydrophobic surface liquid drop migration device and the using method thereof, the green laser is utilized to heat the substrate, titanium dioxide in the substrate is subjected to photo-thermal conversion and heat is transferred to polydimethylsiloxane, the polydimethylsiloxane is heated to generate deformation protrusions, and whenliquid drops arranged on the surface of the transparent superhydrophobic layer reach rolling angles on slopes formed by the deformation protrusions, the liquid drops roll downwards, so that the rolling migration of the directionally controlled liquid drops is realized, the precise control of micro-fluid is realized, and the photothermal directional control elastic superhydrophobic surface liquiddrop migration device can be widely applied to the fields of fluid transportation, chemical analysis, medical detection and the like.

Description

technical field [0001] The invention relates to the field of microfluidics, in particular to a photothermal directional control elastic super-hydrophobic surface droplet migration device and a use method. Background technique [0002] Microfluidic technology is a technology involving fluid process processing and device manufacturing in micron-scale space. It uses miniaturized fluid processing and detection systems to study various effects and behaviors of microfluidics under the micron-scale structure. Due to its high-throughput microchannels and flow networks, efficient fluid handling and detection mechanisms, and potential low-cost applications, it has been widely used in the pharmaceutical industry, biotechnology and bioanalysis, medicine, chemical analysis, machinery, etc. , IT industry and even national defense and aerospace and other fields. [0003] In recent years, there have been many studies based on microfluidic chips. Relevant scholars have studied the behavior...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K3/22B01L3/00
Inventor 陈蓉李浩楠叶丁丁张彪朱恂廖强何雪丰
Owner CHONGQING UNIV
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