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Nanomaterials 2020, 10, 2202 7 of 16 Finally, apart from the hydrodynamic parameters, we have also included the dimensionless supersaturation ratio term, S, in our empirical model to account for the effect of antisolvent to solvent flow ratio. S is defined in Equation (9), where C* is the solubility of starch which varies with the antisolvent to solvent ratio and the solute concentration, C, is kept constant at 2% w/v in all experiments. S=C (9) C∗ 3. Results and Discussion A selection of the mean particle sizes obtained from the DLS measurements is displayed in Figure 4 [28]. These correspond to varying conditions of flow rate, disc rotational speed and antisolvent to solvent ratio. In summary, the graphs show a reduction in particle size at increased conditions of flow rate, disc rotational speed and antisolvent to solvent ratio up until the central point. Further increase in the operational parameters leads to either an increase in particle size or no further change in particle size as a result of particle agglomeration or the poor mixing phenomenon at conditions of 1:1 antisolvent to solvent ratio and high flow rate/disc speed. Further discussion of the experimental results can be found in [28]. Figure 4. Effect of: (A) Flow rate (1200 rpm, 9:1 ratio); (B) disc rotational speed (18 mL/s, 9:1 ratio); (C) antisolvent to solvent ratio (1200 rpm and 18 mL/s) on particle size for smooth and grooved discs. Reproduced from [28], De Gruyter, 2019. 3.1. Model 1: Using Rotational Reynolds Number to Characterise Disc Rotational Speed The particle size for starch nanoparticles can be represented in the form of Equation (10) for the rotational Reynolds number. This particular form of linear multiple regression has been selected for simplicity and has been used previously in precipitation systems to predict particle size [39,65]. Particle size (microns) = A ReaReωbSc (10)PDF Image | Hydro Starch Nanoparticles Precip Spinning Disc Reactor
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