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A magnetic field detector based on qcm and magnetic micro-nano fibers and its preparation method

A technology of micro-nano fibers and magnetic nanoparticles, applied in the field of sensors, to achieve the effect of simple preparation method, simple structure and high sensitivity

Active Publication Date: 2018-10-02
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there is no report on the application of micro-induction magnetic field

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  • A magnetic field detector based on qcm and magnetic micro-nano fibers and its preparation method
  • A magnetic field detector based on qcm and magnetic micro-nano fibers and its preparation method
  • A magnetic field detector based on qcm and magnetic micro-nano fibers and its preparation method

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Effect test

Embodiment 1

[0031] A method for preparing a magnetic field detector based on QCM and magnetic micro-nano fibers, comprising the following steps:

[0032] (1) The construction of the magnetic spinning device: the magnetic spinning device is as follows: figure 1 As shown, it includes a feeding device that can control the feeding rate, a spinning nozzle 4, a nozzle driving mechanism and a spinning receiving device, and the spinning receiving device includes a horizontally arranged collecting disc 6, and the collecting disc 6 The center of the bottom circle is connected with the output shaft of the DC brushless motor 10, and the DC brushless motor 10 is electrically connected to the power supply and the motor controller 11 for controlling the motor speed. The upper surface of the collecting disc 6 is symmetrical about the central axis of the disc. A plurality of vertical pillars are set, and the vertical pillars are 4, of which 1 is a permanent magnet 5, and 3 are metal fine needles 7, and th...

Embodiment 2

[0038] A method for preparing a magnetic field detector based on QCM and magnetic micro-nano fibers, the steps of which are similar to those in Example 1, the difference being that step (2) prepares the spinning precursor solution: sodium dodecylbenzenesulfonate is selected as the surface As active agent, γ-Fe with a diameter of 20 nm 2 o 3 Disperse the magnetic nanoparticles into chloroform, add surfactants with the same quality as the magnetic nanoparticles, and prepare γ-Fe 2 o 3 A magnetic fluid solution with a mass fraction of 11.5% of magnetic nanoparticles; 2.2 grams of polyvinylidene fluoride with a molecular weight of 270,000 was added to a mixed solution of 3.8 grams of N,N-dimethylformamide and 3.8 grams of acetone, heated in a water bath at 40°C and magnetically stirred for 3 After one hour, the solution was mixed uniformly to obtain a polymer solution; the polymer solution and the magnetic fluid solution were mixed and stirred for 3 hours at a solution mass rati...

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Abstract

The invention discloses a magnetic field detector based on a QCM and magnetic micro-nano fibers and a manufacturing method thereof. The magnetic field detector uses magnetic spun micro-nano fiber films or twisted wires as sensitive materials of a quartz crystal microbalance (QCM) mass-type sensor, and fibers of the magnetic spun micro-nano fiber twisted wires contain superparamagnetism nano-particles. According to the detector, advantages of the QCM sensor are used for weak magnetic field sensing, and environmental magnetic field changes can be measured qualitatively and quantitatively. The sensitivity is high; minimal magnetic field changes can be rapidly sensed; the manufacturing method is simple; and operation and usage are provided with convenience.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a magnetic field detector based on QCM and magnetic micro-nano fibers and a preparation method. Background technique [0002] Quartz crystal microbalance (QCM) is mainly composed of resonator (probe), oscillator, signal detection and data processing and other parts. Among them, the resonator is the receiver and converter of the sensor. It is composed of two parallel metal electrodes modified on the surface of the AT-cut quartz wafer by vacuum deposition or evaporation. Electrode surface modification has membrane materials with specific selection and recognition functions. QCM is a very sensitive quality detection instrument, the measurement accuracy can reach the nanogram level, which is 100 times higher than the electronic microbalance with the sensitivity at the microgram level. The most basic principle is to use the piezoelectric effect of the quartz crystal to convert the quartz cryst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 龙云泽于桂凤闫旭张红娣贺晓晓李金涛贾宪生秦崇崇
Owner QINGDAO UNIV
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