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A kind of film for controlling droplet shape and its preparation method and application

A technology for controlling liquid and thin films, which is applied in the process of producing decorative surface effects, the coupling of optical waveguides, and the manufacture of microstructure devices. It can solve the problems of easy overflow of liquid at the boundary and poor control of boundary overflow, and achieve Prevent boundary overflow, improve robustness, and suppress the effects of diffusion

Active Publication Date: 2021-01-26
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two-dimensional hydrophilic-hydrophobic composite pattern in the prior art has key technical bottlenecks such as easy liquid overflow at the boundary and poor control of boundary overflow in terms of shape control of droplets.

Method used

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  • A kind of film for controlling droplet shape and its preparation method and application
  • A kind of film for controlling droplet shape and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Deposit a layer of 100nm titanium metal layer 2 on the glass substrate 1 by magnetron sputtering deposition process.

[0052] Step 2: Writing a rectangular array pattern on the 100nm titanium metal layer 2 by laser direct writing technology to obtain a patterned titanium metal layer. Among them, the writing parameters of the laser direct writing technology are: laser power 6mW; laser pulse width 1ms.

[0053] Step 3: immerse the obtained patterned thin film in a dilute hydrogen fluoride solution with a mass fraction of 6% for 100 min to obtain a thin film with a rectangular array pattern for controlling the droplet shape.

[0054] Step 4: Water droplets are dropped onto the film for controlling the droplet shape in a rectangular array pattern, and the droplets can spread along the rectangular pattern and be pinned to the sharp edges of the rectangular pattern.

Embodiment 2

[0056] Step 1: Deposit a layer of 20nm titanium metal layer 2 on the glass substrate 1 by magnetron sputtering deposition process.

[0057] Step 2: Write the square array pattern on the 20nm titanium metal layer 2 by laser direct writing technology to obtain a patterned titanium metal layer. Among them, the writing parameters of the laser direct writing technology are: laser power 6mW; laser pulse width 1ms.

[0058] Step 3: immerse the obtained patterned titanium metal layer in a dilute hydrogen fluoride solution with a mass fraction of 5% for 60 minutes to obtain a thin film with a rectangular array pattern for controlling the droplet shape.

[0059] Step 4: Drop the water droplet onto the thin film for controlling the shape of the droplet in a rectangular array pattern. The droplet can spread along the rectangular pattern and be pinned on the sharp edge of the rectangular pattern. The droplet does not collapse within 1 hour.

Embodiment 3

[0061] Step 1: Deposit a layer of 200nm titanium metal layer 2 on the glass substrate 1 by magnetron sputtering deposition process.

[0062] Step 2: Writing a rectangular array pattern on the 200nm titanium metal layer 2 by laser direct writing technology to obtain a patterned titanium metal layer. Among them, the writing parameters of the laser direct writing technology are: laser power 6mW; laser pulse width 1ms.

[0063] Step 3: immerse the obtained patterned titanium metal layer in a diluted hydrogen fluoride solution with a mass fraction of 8% for 150 minutes to obtain a rectangular pattern array with sharp edges.

[0064] Step 4: Drop the water droplet onto the thin film for controlling the shape of the droplet in a rectangular array pattern. The droplet can spread along the rectangular pattern and be pinned on the sharp edge of the rectangular pattern. The droplet does not collapse within 1 hour.

[0065] The invention solves the problem that the droplet is not robust ...

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Abstract

The invention discloses a thin film for controlling the shape of liquid droplets, a preparation method and application thereof. The preparation method of the thin film for controlling the droplet shape includes: providing a substrate; depositing a titanium metal layer on the substrate; writing a pattern on the titanium metal layer by laser direct writing technology to obtain a patterned Titanium metal layer: performing wet etching on the patterned titanium metal layer to obtain a film with a suspension cut structure. The thin film used for controlling the droplet shape prepared by the invention is formed with a hanging cut structure with sharp edges, which has a strong pinning effect on the liquid, thereby improving the robustness of the droplet shape.

Description

technical field [0001] The invention relates to the technical field of micro-nano processing, in particular to a thin film for controlling the shape of liquid droplets, a preparation method and application thereof. Background technique [0002] The shape of the commonly seen droplet is generally visible to the naked eye at the millimeter level, close to a spherical shape, and the smaller the droplet, the closer the shape is to a spherical shape. Because the surface layer of the liquid has surface tension, the liquid surface tends to shrink under the action of the surface tension. Among objects of various shapes with the same volume, the spherical object has the smallest surface area, so the droplet is spherical. Therefore, it is more difficult to control the shape of the droplet, especially the shape of the micro-droplet, and to obtain droplets of other shapes such as triangles and squares. [0003] With the development of microfluidic technology, micro-droplet shape manipu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B81B7/00B81B7/04B81C1/00
CPCB81B7/00B81B7/04B81C1/00015B81C1/00031B81C1/00158
Inventor 王萌王宁仇明侠杨焕何铁锋张良静项炳锡
Owner SHENZHEN TECH UNIV
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