Agglomeration front dynamics: Drying in sessile nano-particle laden droplets

Sanyal, Apratim; Basu, Saptarshi; Chaudhuri, Swetaprovo

doi:10.1016/j.ces.2014.11.020

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…Sessile droplets with suspended insoluble solids, especially nanoparticles were investigated by Zhong et al, Sanyal et al, and Crivoi and Duan . The investigations address evaporation fundamentals, particle self‐assembly and deposition pattern in these sessile nanofluid droplets.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the morphology of salt deposits from drying sessile droplets by white‐light interferometry

Sondej

Peglow

Bück³

et al. 2018

AIChE Journal

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This study presents a new approach to investigate the drying behavior and the structure of deposit resulting from drying of solid containing micro droplets. It is shown that deposit structure (porosity and "footprint") depends on drying conditions. This dependency may contribute to better understanding of particle-forming processes, such as fluidized bed coating. In the framework of this study, sessile droplets containing sodium benzoate dissolved in water were dried on thin glass plates in a small drying chamber. The drying conditions (temperature, moisture content and flow rate of drying gas) and material parameters (solid content of solution) were systematically varied. The drying rate of droplets was determined from the moisture balance of the drying gas. The final three-dimensional shape of dried sessile droplets was measured using white-light interferometry and transformed into a two-dimensional profile using a Monte Carlo method. Moreover the mean porosity of dried droplets was calculated. By comparison of structural information and process conditions it is shown that the drying process may have a large influence on deposit structure. T g,in , gas inlet temperature; _ V air , gas volume flow rate; Y in , inlet air moisture content; c s , initial solid mass fraction.

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Section: Introductionmentioning

confidence: 99%

“…Experimental investigations and analysis of the dried structures on substrates have until now mostly been two‐dimensional (2D) with lateral or overhead view using SEM, CCD camera systems, laser microscopes, etc . Still rare is the investigation by 3D surface analysis systems such as interferometry.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the morphology of salt deposits from drying sessile droplets by white‐light interferometry

Sondej

Peglow

Bück³

et al. 2018

AIChE Journal

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“…As evaporation progresses, the agglomeration front shows a radially inward growth and nally extends till the centre. 26 In case 1 [Fig. 1a], nanosilica droplet of 4 wt% by concentration is initially dispensed on glass slide and allowed to naturally evaporate.…”

Section: Methodsmentioning

confidence: 99%

“…In such a scenario, we proposed the double droplet methodology of material stacking that uses capillary ow within the rst deployed sessile particle laden droplet to form an initial solid dam like structure. 26 This inner edge of this solid structure (Fig. 1; referred to as agglomeration front (A f )) has demonstrated the ability to contain liquid from subsequent droplet additions without spillage.…”

Section: Introductionmentioning

confidence: 97%

Deployment strategy for controlled morphologies in sessile, mixed colloidal droplets

2015

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“…Bruning et al 6 investigated the structure formation within single salt‐containing droplets. Zhong et al 7 and Sanyal et al 8 respectively studied the corresponding formation for droplets containing nanoparticles. Potential possibilities for coating layers resulting from the investigated coffee‐ring structures were discussed by Brutin et al, 9 while Yunker et al 10 pointed out the different associated problems.…”

Section: Introductionmentioning

confidence: 99%

In‐depth investigation of incremental layer build‐up from dried deposited droplets

Janocha

Tsotsas

2021

AIChE Journal

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This study presents an approach to closely investigate the process of incremental layer build‐up from convectively dried sessile droplets. In a droplet‐by‐droplet manner, three layers of sodium benzoate solution droplets are consecutively applied on a glass substrate and successively dried in a laboratory‐scale drying chamber. The morphology of the simplified layer structure that incrementally forms from the individual deposits is analyzed via white‐light interferometry, after every addition of a new droplet. Furthermore, complementary X‐ray micro‐tomography measurements of the deposits were carried out to monitor inner structure development. Recurring steps and phenomena throughout the experimental build‐up process were identified and could be characterized through these methods. Moreover, these phenomena could be linked to specific combinations of droplet positioning and drying conditions. Finally, the overall influence of convective drying parameters as well as droplet properties on the layer formation process was investigated with regard to morphology and porosity.

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Agglomeration front dynamics: Drying in sessile nano-particle laden droplets

Cited by 10 publications

References 23 publications

Experimental investigation of the morphology of salt deposits from drying sessile droplets by white‐light interferometry

Experimental investigation of the morphology of salt deposits from drying sessile droplets by white‐light interferometry

Deployment strategy for controlled morphologies in sessile, mixed colloidal droplets

In‐depth investigation of incremental layer build‐up from dried deposited droplets

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