Influence of Process Parameters on the Morphology of Spray‐Dried BaCl<sub>2</sub> Powders

Shoulders, W. Taylor; Bizarri, Grégory; Bourret, Edith; Gaumé, Romain

doi:10.1111/jace.13869

Cited by 6 publications

(3 citation statements)

References 33 publications

(53 reference statements)

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“…8 Spray drying allows the continuous production of dry solids in powder, granulate or agglomerate form in the aerosol phase and involves controlled drying of the aerosol droplet by contact with a warm carrier gas in a drying chamber. [6][7][8][9] Although many successes have been reported, 8,[10][11][12] a lot of challenges still persist in practice for the optimization of spray drying techniques from both fundamental research and industrial scale-ups. 6,13,14 The polydispersity in size resulting from the atomization of a liquid feed solution into a hot drying chamber and the variation in trajectories within the drying chamber (and, thus, drying rates) makes it challenging to precisely study the links between the droplet drying kinetics and the resulting particle morphology in situ.…”

Section: Introductionmentioning

confidence: 99%

“…The drying of colloidal suspensions in aerosol droplets provides particles that are fundamental building blocks in many industrial applications including food processing, sprays in pharmaceuticals, inhaled drug delivery, cosmetics, ceramics, and many more. − To date, spray drying is one of the most widely used techniques to dry aerosol droplets because of its industrial popularity, ,, scalability, and the ability to control some of the parameters that determine the aerosol droplet drying process . Spray drying allows the continuous production of dry solids in powder, granulate, or agglomerate form in the aerosol phase and involves controlled drying of the aerosol droplet by contact with a warm carrier gas in a drying chamber. − Although many successes have been reported, ,− a lot of challenges still persist in practice for the optimization of spray drying techniques from both fundamental research and industrial scale-ups. ,, The polydispersity in size resulting from the atomization of a liquid feed solution into a hot drying chamber and the variation in trajectories within the drying chamber (and, thus, drying rates) makes it challenging to precisely study the links between the droplet drying kinetics and the resulting particle morphology in situ . , …”

Section: Introductionmentioning

confidence: 99%

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Drying Kinetics and Particle Formation from Dilute Colloidal Suspensions in Aerosol Droplets

et al. 2020

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Industrial processes such as spray drying of pharmaceutical and food products often involve the drying of aerosol droplets containing colloidal suspensions into powdered microparticles of desired properties. The morphology and surface properties of the final dry products/microparticles obtained after the drying process are strongly influenced by the parameters of the initial aerosol droplet composition and the drying conditions. In particular, the final dry microparticle morphology can be dependent on the dimensionless Péclet number (Pe), which expresses the relative competition between the diffusion of the dispersed particles within the droplet and the rate of solvent loss via evaporation. In this work, we examine how control over the gas phase drying conditions and initial aerosol droplet composition can be used to influence the aerosol droplet drying kinetics in the gas phase for a range of Péclet numbers. We used a single-particle levitation instrument, the electrodynamic balance, to measure the drying kinetics of colloidal silica droplets (0.10 -0.60 % v/v) under controlled gas phase drying conditions of temperature (263 -326 K) and relative humidity (0 -90 %) and obtained Péclet numbers ranging from 4.05 -184.5. We demonstrate that, for aerosol droplets with initially dilute feed colloid concentrations and within the constant evaporation regime, the starting composition does not strongly influence the solvent evaporation rate with the included nanoparticles (NPs) acting as spectators. However, the gas phase drying conditions, temperature, and relative humidity, directly influences the droplet temperature via evaporative cooling as well as the droplet drying kinetics and the final dry microparticle properties. With a priori knowledge of the droplet drying kinetics from the single droplet measurements, we further demonstrate the possibility of tailoring the morphology of the dried microparticles. Dried silica microparticles collected at Pe = 23.8 had dense spherical morphologies whiles those at the highest Pe = 180.0 had crumpled surface morphologies with a transition in morphology between these limiting Pe values. Our results extend the fundamental understanding of the mechanisms controlling the drying of aerosol droplets in colloidal suspensions across a wide range of application areas extending from spray drying, to the drying of respiratory fluid droplets containing bacteria and viruses, and the drying of atmospheric aerosol droplets.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drying Kinetics and Particle Formation from Dilute Colloidal Suspensions in Aerosol Droplets

et al. 2020

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“…However, the inlet temperature also influences the wet-bulb temperature inside the chamber, which is the temperature reached when the gas is saturated with the vapor from the liquid. At an optimum wet bulb temperature, a constant evaporation rate can be reached, in which the droplet water diffuses rapidly from the core to its surface, providing a constant loss of moisture [ 54 , 55 ].…”

Section: Granulation Factorsmentioning

confidence: 99%

Granulation of Silicon Nitride Powders by Spray Drying: A Review

et al. 2022

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Spray drying is a widely used method of converting liquid material (aqueous or organic solutions, emulsions and suspensions) into a dry powder. Good flowability, narrow size distribution, and controllable morphology are inherent in powders produced by spray drying. This review considers the granulation factors that influence the final properties of the silicon nitride dried powders. The first group includes the types of atomizers, manifolds, and drying chamber configurations. The process parameters fall into the second group and include the following: inlet temperature, atomizing air flow, feed flow rate, drying gas flow rate, outlet temperature, and drying time. Finally, the last group, feedstock parameters, includes many factors such as feed surface tension, feed viscosity, solvent type, solid particle concentration, and additives. Given the large number of factors affecting morphology, particle size and moisture, optimizing the spray drying process is usually achieved by the “trial and error” approach. Nevertheless, some factors such as the effect of a solvent, dispersant, binder, and sintering additives considered in the literature that affect the Si3N4 granulation process were reviewed in the work. By summarizing the data available on silicon nitride powder production, the authors attempt to tackle the problem of its emerging demand in science and industry.

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Preparation of additive manufacturing powder by external field–enabled: a comparative assessment

Feng,

Jia,

et al. 2023

Int J Adv Manuf Technol

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Influence of Process Parameters on the Morphology of Spray‐Dried BaCl₂ Powders

Cited by 6 publications

References 33 publications

Drying Kinetics and Particle Formation from Dilute Colloidal Suspensions in Aerosol Droplets

Drying Kinetics and Particle Formation from Dilute Colloidal Suspensions in Aerosol Droplets

Granulation of Silicon Nitride Powders by Spray Drying: A Review

Preparation of additive manufacturing powder by external field–enabled: a comparative assessment

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Influence of Process Parameters on the Morphology of Spray‐Dried BaCl2 Powders

Cited by 6 publications

References 33 publications

Drying Kinetics and Particle Formation from Dilute Colloidal Suspensions in Aerosol Droplets

Drying Kinetics and Particle Formation from Dilute Colloidal Suspensions in Aerosol Droplets

Granulation of Silicon Nitride Powders by Spray Drying: A Review

Preparation of additive manufacturing powder by external field–enabled: a comparative assessment

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Product

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Influence of Process Parameters on the Morphology of Spray‐Dried BaCl₂ Powders