Investigation into the Formation of Fluidized Titanium Dioxide Porous Nanoagglomerates in a Conical Fluid Bed and Evaluating Its Physical and Mechanical Properties

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MOHAMMADI MARYAM; BAHRAMIAN ALIREZA; Mahjoob Paniz

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Journal Paper

Paper Information

Journal: Nashrieh Shimi va Mohandesi Shimi Iran Year:2022 | Volume:40 | Issue:4 (102) Page(s): 189-204

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Title

Investigation into the Formation of Fluidized Titanium Dioxide Porous Nanoagglomerates in a Conical Fluid Bed and Evaluating Its Physical and Mechanical Properties

Author(s)

MOHAMMADI MARYAM | BAHRAMIAN ALIREZA | Mahjoob Paniz | Issue Writer Certificate

Keywords

Titanium oxide

Agglomerates

Porous nanoparticles

Elastic force

Floating

Conical fluidized bed

Abstract

In this study, the hydrodynamic behavior of a conical fluid bed containing hydrophilic Titanium oxide P25 nanoparticles and the formation of Agglomerates were investigated. The particles with an initial diameter of 21 nm were fluidized by nitrogen and airflow at different superficial gas velocities. The size of the Agglomerates during fluidization was determined by laser imaging and microscope electron diffraction (SEM) in the range of 40-250 μ, m. According to laser images, the average size of Agglomerates fluidized by nitrogen gas and airflow was 112 and 131 μ, m, respectively, while the average size of the complex Agglomerates at the end of fluidization with nitrogen gas and airflow were 75 and 95 μ, m, respectively. The dynamical analysis of the bed showed that the size of the final Agglomerates is highly dependent on the fluidization time. Due to the strong attractive forces between the nanoparticles, the size of the primary Agglomerates was in the range of approximately 220-120 μ, m, which, with the continuation of fluidization, was broken down into smaller particles in the range of 145-100 μ, m. Young's modulus was calculated by fitting the displacement curve obtained from atomic force microscopy to 144 kPa, which corresponded to the Hertz model (141 kPa). The results indicated that increasing the gas velocity and applying airflow can partly increase the mean sphericity of particles (0. 82-0. 86). According to the experiments, fluidization time had a significant effect on the reduction of particle sphericity (0. 58-0. 75), which was affected by the failure of large Agglomerates with sharp edges. The results showed that the initial Agglomerates were fragile and have porosity above 80%, whereas the ultimate porosity was less than 50% with a relatively smooth surface. Unlike particle fluidization in cylindrical fluidized beds, the results of this study can help reduce particle agglomeration and achieve uniform particle size distribution.

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APA: Copy

MOHAMMADI, MARYAM, BAHRAMIAN, ALIREZA, & Mahjoob, Paniz. (2022). Investigation into the Formation of Fluidized Titanium Dioxide Porous Nanoagglomerates in a Conical Fluid Bed and Evaluating Its Physical and Mechanical Properties. NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN), 40(4 (102) ), 189-204. SID. https://sid.ir/paper/1039950/en

Vancouver: Copy

MOHAMMADI MARYAM, BAHRAMIAN ALIREZA, Mahjoob Paniz. Investigation into the Formation of Fluidized Titanium Dioxide Porous Nanoagglomerates in a Conical Fluid Bed and Evaluating Its Physical and Mechanical Properties. NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN)[Internet]. 2022;40(4 (102) ):189-204. Available from: https://sid.ir/paper/1039950/en

IEEE: Copy

MARYAM MOHAMMADI, ALIREZA BAHRAMIAN, and Paniz Mahjoob, “Investigation into the Formation of Fluidized Titanium Dioxide Porous Nanoagglomerates in a Conical Fluid Bed and Evaluating Its Physical and Mechanical Properties,” NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN), vol. 40, no. 4 (102) , pp. 189–204, 2022, [Online]. Available: https://sid.ir/paper/1039950/en

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