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VGU RESEARCH REPOSITORY


Please use this identifier to cite or link to this item: https://epub.vgu.edu.vn/handle/dlibvgu/1069
Title: Influence of the temperature and pressure on the droplet formation of acidic silicic solution in compressed carbon dioxide
Authors: Le Tran Huy Thang 
Keywords: Droplet formation;Acidic silicic;Carbon dioxide
Issue Date: 2019
Abstract: 
Aerogels have been studied for almost a century due to their usage in a wide range of applications. Recently, Fraunhofer institute UMSICHT has developed a unique and integrated one step process to produce aerogels through droplet breakup process. However, how to manipulate granular silica aerogel diameter through that process in the
towering autoclave under compressed CO2 is still unknown. Droplet size in this process could be controlled by different parameters such as pump’s characteristics, fluid’s characteristics or autoclave conditions. In this thesis, two factors
including temperature and pressure inside the towering autoclave were studied. Five pressure values ranging from 30 bar to 150 bar and three temperature values including 100, 125 and 150 were tested. Sodium silicate was used as the precursor to produce the acidic silicic solution. The hydrogel was taken into account instead of the aerogel due to the limited amount of experiment’s time and the complexity of the aerogel synthesis process inside the towering autoclave. Silica-based hydrogel size was measured by the digital microscope. The experiment’s results indicate hydrogel size would drop when
increasing the autoclave’s pressure or temperature.
URI(1): http://epub.vgu.edu.vn/handle/dlibvgu/1069
Rights: Attribution-NonCommercial 4.0 International
Appears in Collections:Mechanical Engineering (MEN)

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