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Magnetic liquid marble and light control method thereof

A technology of magnetic liquid and light manipulation, applied in the field of materials, can solve the problems of evaporation and pollution, and achieve the effect of simple operation, solution of liquid evaporation and pollution, and high flexibility

Active Publication Date: 2019-04-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the movement of the magnetic liquid marbles reported so far can rely on its magnetic field responsiveness and be driven by a magnetic field, the magnetic hydrophobic particles coated on the surface tend to move under the action of the magnetic field while driving, resulting in magnetic "Openings" appear on the surface of the liquid marble
This feature is conducive to the use of magnetic liquid marbles as microreactors, but there are some problems in the use of liquid marbles as liquid transport carriers, such as evaporation and pollution during liquid transport.

Method used

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  • Magnetic liquid marble and light control method thereof
  • Magnetic liquid marble and light control method thereof
  • Magnetic liquid marble and light control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A strategy for manipulating light with magnetic liquid marbles, which includes the following steps: spread hydrophobic iron ferric oxide nanoparticles on a petri dish, drop 15 μL of water onto the particles, shake the petri dish to make the droplets roll freely, and the hydrophobic The particles autonomously adsorb on the surface of the droplet to form liquid marbles.

[0030] Place the magnetic liquid marbles on the water surface in the Petri dish, use a light source with a wavelength of 808nm and a spot size of 2mm, and set the output power to 490mW mm -2 , manually manipulate the light source to irradiate the lower half of the liquid marble from obliquely above at an angle of ~30° from the horizontal, and the negative phototaxis motion of the magnetic liquid marble can be obtained. in, figure 1 a is a schematic diagram of light shining on the lower half of a magnetic liquid marble. figure 1 b is a time-series photo of a typical negative phototaxis motion of a magne...

Embodiment 2

[0032] Adjust the volume of the water droplet in Example 1 to 5 μL, 25 μL, 35 μL and 45 μL, repeat the steps in Example 1 above, the magnetic liquid marbles show negative phototactic motion, and the movement speed is as follows: figure 2 As shown, it shows that the phototaxis motion speed of the magnetic liquid marble is related to the volume of the magnetic liquid marble.

Embodiment 3

[0034] The output power of the light source in embodiment 1 is adjusted to 160mW mm -2 ,330mW mm -2 ,680mW mm -2 and 830mWmm -2 , repeating the steps of the above embodiment 1, the magnetic liquid marbles show negative phototaxis motion, and the motion speed increases with the increase of the light power, such as image 3 As shown, it shows that controlling the light intensity can realize the control of the movement speed of the magnetic liquid marbles.

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Abstract

The invention discloses a magnetic liquid marble light control method, which comprises the following steps: coating water droplets with hydrophobic ferroferric oxide nanoparticles to obtain a magneticliquid marble, and placing the magnetic liquid marble on water surface; using a light source for a certain angle of irradiation on the surface of the liquid marble, causing the change in water surface tension under the photothermal effect of the ferroferric oxide nanoparticles, and promoting phototaxis movement of the magnetic liquid marble on the water surface; switching the phototaxis of the magnetic liquid marble by the illumination area of the light source, and controlling the movement speed by the illumination intensity and the incident angle. The operation is simple and has high flexibility, the direction and speed can be controlled, and switching of the positive and negative phototaxis of the magnetic liquid marble is realized without changing the composition or light source type.In addition, liquid evaporation and pollution of the magnetic liquid marble under the magnetic field effect in the transportation process are also effectively solved, and an effective solution is provided for the magnetic liquid marble as a liquid transport carrier.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a magnetic liquid marble and a light manipulation method thereof. Background technique [0002] The manipulation of small-volume liquids in microsystems is of great significance, and has broad application prospects in biomedicine, microfluidics, and other fields. At present, the movement of small-volume liquids is mostly based on microfluidic devices, which have obvious defects, such as low freedom of movement caused by restricted channels and inevitable liquid adsorption. Liquid marbles are a stable liquid-solid complex composed of tiny droplets and hydrophobic particles. It not only tends to form a non-stick liquid-solid interface, but also effectively reduces the movement resistance caused by the hysteresis of the dynamic contact angle of the droplets. , it is also possible to control the movement of the liquid marbles in combination with the inherent characteri...

Claims

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Application Information

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IPC IPC(8): B01J19/12B01L3/00
CPCB01J19/0093B01J19/122B01J19/123B01L3/50273
Inventor 许蕾蕾马冲管彬官建国
Owner WUHAN UNIV OF TECH
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