Determination of the Metastable Zone and Induction Time in Nucleation of Aluminum Sulfate Nanoparticles in Presence of Anti-solvent and           Surface Active Agents

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Bagheri, Mohammad | 2014

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Type of Document: M.Sc. Thesis
Language: English
Document No: 47922 (57)
University: Sharif University of Technology, International Campus, Kish Island
Department: Science and Engineering
Advisor(s): Ghorbani, Mohammad; Manteghian, Mehrdad
Abstract:
Aluminum sulfate is widely used in water treatment as a polyelectrolyte. Its dissolution and recrystallization into nanoparticles directly affects the working conditions. This study concerns determination of the metastable zone and induction time in nucleation of aluminum sulfate nanoparticles in aqueous media and in presence of acetone as anti-solvent. Later the effect of SDS on the metastable zone and induction time are also studied.. The study also shows if the presence of anti-solvents and surface active agents can vary this phenomenon. The study also adds to our understanding of the media in creation and stabilization of nanoparticles. This project has a special focus on the changes induction time and then Surface tension by changes in the level of supersaturation .It was found that the surface tension in the absence of surfactant was 6.3052 *10 -3 and this value was 5.334267 * 10 -3 for the highest amount of aluminum in the presence of surfactants and then by reducing the amount of alum the surface tension also decreases. For the least amount of alum this value is reduced to 2.9355*10-3
Keywords:
Nucleation ; Aluminum Sulphate ; Surface Tension ; Supersaturation ; Sodium Citrate ; Surfactants ; Induction Time ; Crystallization

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