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Effect of ultrasonic-induced selenium crystallization behavior during selenium reduction.

Zheng Yang1, Yonggang Zuo1, Linqing Dai1

  • 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Key Laboratory of Unconventional Metallurgy Ministry of Education, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Key Laboratory of Special Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, China.

Ultrasonics Sonochemistry
|April 3, 2023
PubMed
Summary

Ultrasonic waves accelerate selenium crystallization by influencing nucleation. This study details how ultrasonic parameters and temperature affect nano-selenium morphology and integrity.

Keywords:
NucleationSeleniumSonocrystallisationUltrasound

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Selenium crystallization is crucial for material properties.
  • Understanding factors influencing crystallization kinetics and morphology is essential.
  • Conventional methods may lack efficiency in controlling nano-selenium formation.

Purpose of the Study:

  • To investigate the acceleration of selenium crystallization using ultrasonic waves.
  • To compare ultrasonic methods with conventional crystallization conditions.
  • To elucidate the mechanism by which ultrasound affects selenium crystallization.

Main Methods:

  • Comparative analysis of selenium crystallization under ultrasonic and conventional conditions.
  • Systematic variation of ultrasonic parameters (time, power) and reduction temperature.
  • Investigation of H2SeO3 concentration effects.
  • Microscopic analysis using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Main Results:

  • Ultrasonic time, power, and reduction temperature significantly impact selenium crystallization process and morphology.
  • Ultrasonic time is critical for crystallization completeness and product integrity.
  • Ultrasonic power and reduction temperature influence morphology and integrity, enabling control over nano-selenium structures.
  • Both primary and secondary nucleation play key roles in ultrasound-accelerated crystallization.

Conclusions:

  • Ultrasonic cavitation and mechanical effects reduce induction time and enhance primary nucleation.
  • Micro-jets from bubble rupture are primary drivers for secondary nucleation in ultrasound-assisted selenium crystallization.
  • Tailoring ultrasonic parameters allows for controlled synthesis of diverse nano-selenium morphologies.