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Method for monitoring orientation degree of particles in electric field in real time

A particle orientation and real-time monitoring technology, applied in the direction of transmittance measurement, etc., can solve the problems of prolonged preparation time, waste of raw material particles, hindering the development and application of special structural materials, etc., and achieve the effect of simple operation process and reliable results

Inactive Publication Date: 2019-04-16
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At this stage, there are many research methods for the surface morphology of such materials, such as scanning electron microscopy, transmission electron microscopy, atomic force microscopy, etc., but these methods require the preparation of samples first and then characterize the samples, and cannot monitor the electric field of particles in real time during actual preparation. Inducing the degree of orientation in a flowable medium has many inconveniences in production and application, especially in factory production, due to the inability to monitor the degree of particle orientation in real time, resulting in a large waste of raw material particles and prolonging the preparation time. Development and application of special structural materials
[0005] According to the principle of light reflection, when incident light is applied to the particles randomly dispersed in the matrix, the light is largely blocked by the particles and reflected, resulting in a decrease in the light transmittance of the material.

Method used

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  • Method for monitoring orientation degree of particles in electric field in real time
  • Method for monitoring orientation degree of particles in electric field in real time
  • Method for monitoring orientation degree of particles in electric field in real time

Examples

Experimental program
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Embodiment 1

[0027] Using polydimethylsiloxane (PDMS) as the flowable medium and 325-mesh graphite as the oriented particles, graphite and PDMS were uniformly mixed at a mass ratio of 1:200 to prepare graphite and PDMS mixed liquid. Use ITO glass as parallel transparent electrodes, and connect electric field generating equipment, including high-voltage amplifiers, signal generators and oscilloscopes. Place the mixed solution between the transparent electrodes, and place the transparent electrodes in the light transmittance tester using a clamping table. Set the AC voltage to 400V, the frequency to 100Hz, turn on the power, and then record the change of light transmittance every ten seconds. During the detection process, the light transmittance rises rapidly and then tends to be stable, which also confirms that the degree of orientation increases rapidly after turning on the power. , and reach a maximum after a period of time. Add curing agent to the mixed solution, and make the mass ratio...

Embodiment 2

[0029] The specific experimental scheme is similar to that of Example 1, the only difference is that in Example 2 the orientation voltage is controlled to be 800V. The increase of the voltage can lead to the increase of the degree of orientation of the particles and the acceleration of the orientation speed.

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Abstract

The invention provides a method for monitoring the orientation degree of particles in a flowable medium in an electric field in real time. The combined design of a light transmittance detection deviceand an electric field generating device is achieved, so that the change of light transmittance caused by the motion state of particles in the flowable medium can be monitored in real time, and whether orientation of the particles occurs in the medium can be accurately deduced through the change of the light transmittance.

Description

【Technical field】 [0001] The invention relates to the technical field of composite material thin films, in particular to the technical field of monitoring during the process of preparing anisotropic composite material membranes assisted by external fields. 【Background technique】 [0002] When the particle fillers are oriented and arranged in the polymer matrix, the prepared composite material has structural anisotropy, so that the composite material has anisotropic properties, such as optical properties, mechanical properties, electrical properties and thermal properties. In recent years, the use of electric field as an external force to induce the orientation of particles in a flowable medium to prepare orderly structured materials has been widely studied by scientists and has made some progress. For example, the Chinese invention patent with the patent number CN102831992 uses Desoils are aligned and oriented in molten polyethylene. [0003] With the development of technol...

Claims

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Application Information

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IPC IPC(8): G01N21/59C08L83/04C08K3/04C08J5/18
CPCG01N21/59C08J5/18C08K3/04C08J2383/04
Inventor 陈玉伟张建明刘玉红王羽佳杨吉颖张白浪李金博段咏欣
Owner QINGDAO UNIV OF SCI & TECH