Method for measuring particle size of nano solution by utilizing photoacoustic technology

A nano-solution, technical measurement technology, applied in the field of particle size testing, to achieve the effects of simple measurement system structure, simple acquisition and accurate measurement results

Inactive Publication Date: 2019-08-30
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

Since nano-solution particles are usually strong scattering and non-transparent substances, using traditional absorption spectroscopy to measure parameters such as spectral absorption coefficient and band gap of nano-crystalline powders will encounter insurmountable obstacles

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  • Method for measuring particle size of nano solution by utilizing photoacoustic technology
  • Method for measuring particle size of nano solution by utilizing photoacoustic technology
  • Method for measuring particle size of nano solution by utilizing photoacoustic technology

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Embodiment Construction

[0020] When nanoparticles are irradiated by laser light, nanoparticles with different sizes have different absorption cross-sections, and local surface plasmon resonance is also affected by the size of nanoparticles, which causes the optical absorption of nanoparticles to have a strong size dependence. Due to the small size effect of nanoparticles, the heat transfer process of nanoparticles no longer satisfies the thermal confinement condition within a laser pulse width. After the laser pulse is over, due to the ultra-high specific surface area of ​​the nanoparticles, the heat quickly diffuses to the surrounding environment, and the temperature rise of the entire heated area is smoothed within tens of nanoseconds. The thermal expansion and contraction of this region due to temperature rise and fall corresponds exactly to the positive and negative poles of the bipolar photoacoustic signal. The specific steps of the method for measuring the particle size of nanometer solution pa...

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Abstract

The present invention relates to a method for measuring particle size of nano solution by utilizing photoacoustic technology. A modulating pulse laser device emits a laser beam entering into a nano medium to be tested, and light absorption characteristics of nanoparticles in the medium and a plasma element excitation cause the nanoparticles to absorb light energy and convert into heat, thermal expansion of the nanoparticles and the micro opto-acoustic conversion mechanism cause the nanoparticles to periodically emit acoustic wave signals, characteristics of the acoustic wave signals are related to particle size of the nanoparticles, an acoustic sensor is used to detect the acoustic wave signals, the particle size can be obtained through inversion. During the measuring process, the method does not measure optical signals such as scattering and transmission of the particles, but measures the acoustic wave signals emitted by the particles, and enables simpler acquisition of measurement signals, so that measurement results are accurate and reliable. The method can be used in laboratory scientific research, and can realize on-line measurement and industrial field application

Description

technical field [0001] The invention relates to a particle size testing technology, in particular to a method for measuring the particle size of nanometer solution particles by photoacoustic technology. Background technique [0002] Nano-solution particles are artificially produced tiny particles with a particle size ranging from several nanometers to hundreds of nanometers, which belong to the category of colloidal particle size. Nano-solution particles are located between the micro-system and the macro-system, and are groups composed of a small number of atoms or molecules, so they are neither typical micro-systems nor typical macro-systems. Nano-solution particles build a bridge between macroscopic substances, atoms and molecules, and have very important scientific research and practical value. With the advancement of nanotechnology, the unique optical technology of metal nanostructures has very important application prospects in many fields such as biology, medicine, ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
CPCG01N15/0205
Inventor 田昌苏明旭
Owner UNIV OF SHANGHAI FOR SCI & TECH
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