A Phase Change Microvalve Based on Conductive Composite Materials and Inductive Thermal Actuation
A conductive composite material and phase-change microvalve technology, applied in the field of microfluidic systems, can solve problems such as low heat transfer efficiency, uneven heat production, and slow response time, achieving high heating efficiency, short response time, and reliability high effect
Active Publication Date: 2019-07-05
BEIJING UNIV OF TECH
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Problems solved by technology
However, the traditional resistive phase-change microvalve uses a resistive wire to transfer heat to a phase-change material with poor thermal conductivity, which has disadvantages such as uneven heat generation, low heat transfer efficiency, and slow response time. Integrate on the base material in the form of a thin film by deposition, sputtering, etc. This method is complex in process, expensive in equipment, and takes a long time to manufacture
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[0034] as attached Figure 1-3 As shown, the embodiment of the present invention provides a phase change microvalve driven by conductive composite materials and induction heat, which mainly includes a microfluidic chip 1, an elastic film 5, a heating chamber chip 6, a glass substrate 8 and an excitation coil 10; The structure of the micro-channel chip 1 includes a liquid inlet 2 , a micro-channel 3 and a liquid outlet 4 . In this example, the sample phase change material is paraffin wax, the sample conductive material is expanded graphite, the sample high magnetic permeability material is nickel powder, and the sample liquid is deionized water.
[0035] The microvalve machining process of the present invention mainly comprises the following parts:
[0036] The preparation process of the conductive composite material 7 used in the microvalve of the present invention is as follows:
[0037] (a) putting paraffin wax into a glass vessel as a phase change component, and heating i...
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Abstract
The invention relates to a phase-change microvalve based on conductive composite material and induction heat driving, in particular to a phase-change microvalve, and belongs to the field of microfluids control systems. The phase-change microvalve is characterized in that the eddy current is produced in the conductive composite phase-change material by high-frequency electromagnetic induction, thejoule heat is generated by the eddy current and is used for heating the phase-change material, the phase-change material is melted to produce volume change, a thin film is driven by the volume expansion, and a flow passage is closed; the microvalve is an important part of a microfluid system, and can be widely applied to the fields of biomedicines, such as medicine conveying and fuel supplying.
Description
technical field [0001] The invention is a phase-change microvalve driven by conductive composite materials and induction heat, specifically a kind of electric eddy current generated in the conductive composite phase-change material by using high-frequency electromagnetic induction, and the eddy current generates Joule heat to heat the phase-change material. The melting of the phase change material produces volume expansion, which drives the film and closes the phase change microvalve of the flow channel. Microvalve is an important part of microfluidic system, and has broad application prospects in the field of biomedicine, such as drug delivery, fuel supply, etc., and belongs to the field of microfluidic systems. Background technique [0002] Phase-change drive is a micro-valve drive method. At present, most of them are heated by resistive micro-heaters. In 2003, Selvaganapathy and others at the University of Michigan developed a resistive phase-change microvalve made of ch...
Claims
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IPC IPC(8): C08L91/06C08K7/24C08K3/08F16K99/00C09K5/06
Inventor 刘本东杨杰超张震杨佳慧
Owner BEIJING UNIV OF TECH