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Synthesis and polymorph controlling of calcite and aragonite calcium carbonate nanoparticles in a confined impinging-jets reactor

Adavi, K ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cep.2020.108239
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. In this article, a confined-impinging-jets reactor (CIJR) was designed and tested successfully for the synthesis of calcium carbonate nanoparticles using the reactive precipitation method. The proposed CIJR comprised of two opposed nozzles placed in a cylindrical chamber. Effects of various operating and design parameters such as supersaturation, feed flow rate, nozzle diameter, reactor diameter, operating temperature, and surface-active agents on the mean particle size, particle size distribution, and the polymorphs of calcium carbonate nanoparticles were investigated carefully. By changing the supersaturation, reactor diameter, jets velocity, operating temperature, and the nozzle diameter, a wide range of calcium carbonate nanoparticles with mean particle sizes of smaller than 40 nm to larger than 160 nm was synthesized. Mixing intensity and control of parameters decrease the mean particle size and increase selectivity to the synthesis of calcite or aragonite nanoparticles compared to other synthesis devices. The use of high supersaturation values and nozzle diameter of 500 μm in the presence of sodium dodecyl sulfate surfactant result in the synthesis of nanoparticles with a mean particle size of 34 nm and a weight percentage of about 80 % of aragonite phase. © 2020 Elsevier B.V
  6. Keywords:
  7. Confined-impinging-jets reactor ; Micromixing efficiency ; Nanoparticle synthesis ; Particle size distribution ; Reactive precipitation ; Calcite ; Calcium carbonate ; Carbonate minerals ; Carbonation ; Nanoparticles ; Nozzle design ; Nozzles ; Particle size ; Particle size analysis ; Sodium dodecyl sulfate ; Sulfur compounds ; Supersaturation ; Synthesis (chemical) ; Temperature ; Confined impinging jets ; Cylindrical chambers ; Design parameters ; Mean particle size ; Operating temperature ; Precipitation methods ; Reactor diameter ; Weight percentages ; Precipitation (chemical)
  8. Source: Chemical Engineering and Processing - Process Intensification ; 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0255270120307017