Search

Controlling particle size is important in powder technology. Here we report a scalable production process of mesoporous calcium carbonate with a controllable particle size. We focus on the effect of the aggregation rate on the obtained particles. In this study, we change the particle concentration (1.2–12 mass%) to control the aggregation rate and then obtained particles with relatively narrow range of particle size (310 ± 30–560 ± 100 nm) and nearly identical specific surface areas and particle structures by template-free method. We proposed the aggregation model to describe the formation of meso-porous calcium carbonate.

Controlling particle size is important in powder technology. Here we report a scalable production process of mesoporous calcium carbonate with a controllable particle size. We focus on the effect of the aggregation rate on the obtained particles. In this study, we change the particle concentration (1.2–12 mass%) to control the aggregation rate and then obtained particles with relatively narrow range of particle size (310 ± 30–560 ± 100 nm) and nearly identical specific surface areas and particle structures by template-free method. We proposed the aggregation model to describe the formation of meso-porous calcium carbonate.

The effects of low temperature oil coagulation kinetics and floc surface morphology were examined in this Study. The results show that low temperature slowed down the coagulation process as reflected in the decrease in aggregation rate and rate constants. The aggregation constant in the coagulation process was found to follow the Arrhenius law. The activation energy of the aggregation of kaolinite particles in water was 18.7 kJ/mol. Furthermore, the study oil the Surface morphology of the floes indicates that those flocs formed at low temperatures had a more irregular structure in terms of perimeter-based fractal dimension, D-pf. D-pf increased from 1.19 to 1.33 as the temperature was downshifted from 22 degrees C to 2 degrees C. The examined shape factor of the flocs, elongation E, was found to follow the probability rule of statistics. Out of two thousand flocs, around 75\% of them have an E value ranging from 1.2 to 2.0.

The effects of low temperature oil coagulation kinetics and floc surface morphology were examined in this Study. The results show that low temperature slowed down the coagulation process as reflected in the decrease in aggregation rate and rate constants. The aggregation constant in the coagulation process was found to follow the Arrhenius law. The activation energy of the aggregation of kaolinite particles in water was 18.7 kJ/mol. Furthermore, the study oil the Surface morphology of the floes indicates that those flocs formed at low temperatures had a more irregular structure in terms of perimeter-based fractal dimension, D-pf. D-pf increased from 1.19 to 1.33 as the temperature was downshifted from 22 degrees C to 2 degrees C. The examined shape factor of the flocs, elongation E, was found to follow the probability rule of statistics. Out of two thousand flocs, around 75\% of them have an E value ranging from 1.2 to 2.0.

The effects of low temperature oil coagulation kinetics and floc surface morphology were examined in this Study. The results show that low temperature slowed down the coagulation process as reflected in the decrease in aggregation rate and rate constants. The aggregation constant in the coagulation process was found to follow the Arrhenius law. The activation energy of the aggregation of kaolinite particles in water was 18.7 kJ/mol. Furthermore, the study oil the Surface morphology of the floes indicates that those flocs formed at low temperatures had a more irregular structure in terms of perimeter-based fractal dimension, D-pf. D-pf increased from 1.19 to 1.33 as the temperature was downshifted from 22 degrees C to 2 degrees C. The examined shape factor of the flocs, elongation E, was found to follow the probability rule of statistics. Out of two thousand flocs, around 75\% of them have an E value ranging from 1.2 to 2.0.