Numerical simulation of mono-disperse droplet spray dryer: Coupling distinctively different sized chambers

Xiao, Jie; Yang, Shuzhen; George, Oluwafemi Ayodele; Putranto, Aditya; Wu, Winston Duo; Chen, Xiao

doi:10.1016/j.ces.2019.01.030

Cited by 9 publications

(2 citation statements)

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“…[13][14][15]44,45] In addition, on the theoretical side, studies were mostly restricted to employing only one type of nanoparticle. [39,46] The potential of structural and compositional diversity, and therefore, versatile properties when using not only monomodal nanoparticles but also a variety of building blocks, renders it important to study what structures might emerge from such combinations. Indeed, previous studies have also investigated the segregation of different nanoparticles during the process of drying droplets.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the Morphology of Spray‐Dried Supraparticles: Effects of Building Block Size and Concentration

Zhou

Pujales‐Paradela

Groppe

et al. 2022

Part & Part Syst Charact

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fields, such as photonic devices, [5,6] biomaterials, [7][8][9][10] energy conversion, [11,12] and smart, interactive, and "communicating" materials. [13][14][15] Moreover, the resulting properties of supraparticles can be strongly affected not only by the properties of the single nanoparticle building blocks but also by the structures of their hierarchical units. Therefore, different assembled morphologies resulting in supraparticles providing distinct properties, lead to diverse applications. [5,[16][17][18][19][20] For example, shape-anisotropic (e.g., doughnut-like structure) particles were proposed to be utilized in catalysis due to their high surface area and hierarchical porosity, while composition-anisotropic ones (e.g., single-patch magnetic particles) were suggested as, for example, promising drug delivery systems due to their easy manipulation with a magnet. [19,20] There are many developed experimental methods to fabricate supraparticles. The surface-templated evaporationdriven method is a frequently used one, assembling nanoparticles to supraparticles on liquid-repellent surfaces, [21] such as superhydrophobic [19,22] and superamphiphobic one. [23] Another technique is the emulsion-templated self-assembly, in which nanoparticles dispersed in oil droplets within an oil-in-water emulsion (or other phase combinations), arrange themselves into supraparticles. [24] In addition, lately, the microfluidic technique has been applied for the self-assembly of colloids into well-defined structures. [25,26] Apart from the above mentioned approaches, spray-drying also widely draws attention to itself as a fast, economic method to fabricate micron-scale particle powders from solutions or suspensions. [27][28][29][30] It permits to influence the obtained supraparticles by varying the feeding materials or adapting process parameters. Thus, it is a flexible way of assembling single nanoparticles into hierarchical supraparticles.The morphology of the product is strongly influenced by process parameters, such as the drying gas temperature, [10,28,31] the gas flow rate, [10] and the type of nozzle. [30,31] Exemplarily, it varies from spherical to non-spherical structures as a result of fast evaporation of the solvent at high-temperature conditions. [10,28,31,32] Furthermore, the resulting size of the particles can be reduced by increasing the flow rate of the drying gas, which breaks up the dispersion into droplets. [10] Controlling the morphology of spray-dried supraparticles via adjustments at the nanoparticle dispersion level has also been Tuning the morphology of supraparticles can crucially influence their final properties and is, thus, important for their application in chemical, pharmaceutical, and food industries. The present study reveals how varied nanoparticle sizes, concentrations, and weight ratios in multicomponent dispersions influence the morphology of supraparticles assembled by these nanoparticle building blocks via spray-drying. In a droplet containing monodisperse nanoparticles, smaller nanoparticles ...

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