Oil droplet breakup during pressure swirl atomization of emulsions: Influence of emulsion viscosity and viscosity ratio

Taboada, Martha L.; Müller, Eva; Fiedler, Nora; Karbstein, Heike P.; Gaukel, Volker

doi:10.1016/j.jfoodeng.2022.110941

Cited by 8 publications

(8 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As demonstrated in Figure F, it is also observed that the particle size correlates with the viscosity of the system, as higher DCM content, which results in lower viscosity, , yields larger particles. The increasing trend is especially sharp in the case of using pure DCM, due to the nonlinear dependency of particle size and viscosity of the dispersed phase during emulsification. , The observed upward trend is ascribed to the suppressed droplet breakup and enhanced coalescence by decreasing the viscosity of the dispersed phase during the emulsification stage …”

Section: Resultsmentioning

confidence: 93%

“…The increasing trend is especially sharp in the case of using pure DCM, due to the nonlinear dependency of particle size and viscosity of the dispersed phase during emulsification. 52,53 The observed upward trend is ascribed to the suppressed droplet breakup and enhanced coalescence by decreasing the viscosity of the dispersed phase during the emulsification stage. 51 Self-Assembly and Janus Balance.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Tailored Morphology in Polystyrene/Poly(lactic acid) Blend Particles: Solvent’s Effect on Controlled Janus/Core–Shell Structures

Esteki,

Masoomi,

Asadinezhad

2023

Langmuir

View full text Add to dashboard Cite

Controlling the morphology of polymeric particles is vital for their diverse applications. In this study, we explored how solvent composition influences the morphology of poly(styrene)/poly(lactic acid) (PS/PLA) particles prepared via the emulsion solvent evaporation method. We used toluene, dichloromethane (DCM), and various mixtures to prepare these particles. We investigated phase separation within the PS/PLA/solvent system using the Flory–Huggins ternary phase diagram and MesoDyn simulation, revealing pronounced immiscibility and phase separation in both PS/PLA/DCM and PS/PLA/toluene systems. We employed scanning electron microscopy (SEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) to characterize the resulting morphologies. Our study unveiled the substantial impact of solvent composition on particle structure. Using pure toluene resulted in acorn-shaped Janus particles. However, incorporating DCM into the solvent induced a transition from Janus to core–shell morphology. Remarkably, core–shell particles exhibited a single-core structure in a mixed toluene/DCM solvent, indicating thermodynamic stability. In contrast, pure DCM favored kinetically controlled multicore morphology, leading to lower PLA crystallinity due to increased PS–PLA interfaces. Samples with high Janus balance formed a self-assembled, two-dimensional (2-D) monolayer film, demonstrating the interfacial activity of the Janus particles. This 2-D monolayer film exhibits desirable emulsification properties with potential applications in various fields. Our study combines theoretical and experimental analyses, shedding light on the profound impact of solvent composition on the PS/PLA particle morphology. We observed transitions from Janus to core–shell structures, highlighted the influence of solvent viscosity on particle size, and uncovered the formation of self-assembled 2-D monolayer films. These insights are pivotal for tailoring polymeric particle structures. Furthermore, our findings advance macromolecular science in interface design, offering promising prospects for innovative materials development.

show abstract

Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 99%

Tailored Morphology in Polystyrene/Poly(lactic acid) Blend Particles: Solvent’s Effect on Controlled Janus/Core–Shell Structures

Esteki,

Masoomi,

Asadinezhad

2023

Langmuir

View full text Add to dashboard Cite

show abstract

“…For pressure-swirl nozzles, atomization pressure and viscosity ratio between oil and emulsion have been identified as other relevant parameters for oil droplet breakup. Limited impact was found for the initial oil droplet size [7], while no significant impact was found for the emulsion viscosity [8]. When atomizing emulsions with high oil concentrations, the droplet size is not only determined by breakup, but also coalescence [13].…”

Section: Introductionmentioning

confidence: 94%

“…Understanding the influence of atomization conditions on the oil droplet breakup is necessary in order to enable a targeted, understanding-based product design. It has been shown in previous studies [7][8][9][10][11][12] that the oil droplet size is influenced by the atomization step, depending on the kind of atomizer and the energy input. For pressure-swirl nozzles, atomization pressure and viscosity ratio between oil and emulsion have been identified as other relevant parameters for oil droplet breakup.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed increasing oil droplet breakup with increasing shear rates in the liquid lamella at the outlet orifice, and it was concluded that laminar shear stresses in the liquid lamella at the outlet orifice dominate the oil droplet breakup. Furthermore, the model was used in Taboada et al [8] to estimate capillary numbers for different emulsion viscosities and viscosity ratios. The authors used Equation (2) to fit their experimental data, proving it to be effective in describing oil droplet sizes after atomization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Nozzle Geometry and Scale-Up on Oil Droplet Breakup in the Atomization Step during Spray Drying of Emulsions

Höhne,

Taboada,

Schröder

et al. 2024

Fluids

Self Cite

View full text Add to dashboard Cite

Spray drying of oil-in-water emulsions is a widespread encapsulation technique. The oil droplet size (ODS) significantly impacts encapsulation efficiency and other powder properties. The ODS is commonly set to a specific value during homogenization, assuming that it remains unchanged throughout the process, which is often inaccurate. This study investigated the impact of atomizer geometry and nozzle dimensions on oil droplet breakup during atomization using pressure-swirl atomizers. Subject of the investigation were nozzles that differ in the way the liquid is set in motion, as well as different inlet port and outlet orifice dimensions. The results indicate that nozzle inlet port area may have a significant impact on oil droplet breakup, with x90,3 values of the oil droplet size distribution decreasing from 5.29 to 2.30 µm with a decrease of the inlet area from 2.0 to 0.6 mm. Good scalability of the findings from pilot to industrial-scale was shown using larger nozzles. A simplified theoretical model, aiming to predict the ODS as a function of calculated shear rates, showed reasonable agreement to the experimental data for different atomization pressures with coefficients of determination of up to 0.99. However, it was not able to predict the impact of different nozzle dimensions, most likely due to changes in flow characteristics. These results suggest that the stress history of the oil droplets might have a larger influence than expected. Further studies will need to consider other zones of high stress in addition to the outlet orifice.

show abstract

Characterization of physiochemical and thermo oxidative properties of inaja fruit oil (Maximiliana maripa)

Rolim,

Freire,

Muniz

et al. 2024

Food Bioscience

View full text Add to dashboard Cite

Oil droplet breakup during pressure swirl atomization of emulsions: Influence of emulsion viscosity and viscosity ratio

Cited by 8 publications

References 26 publications

Tailored Morphology in Polystyrene/Poly(lactic acid) Blend Particles: Solvent’s Effect on Controlled Janus/Core–Shell Structures

Tailored Morphology in Polystyrene/Poly(lactic acid) Blend Particles: Solvent’s Effect on Controlled Janus/Core–Shell Structures

Influence of Nozzle Geometry and Scale-Up on Oil Droplet Breakup in the Atomization Step during Spray Drying of Emulsions

Characterization of physiochemical and thermo oxidative properties of inaja fruit oil (Maximiliana maripa)

Contact Info

Product

Resources

About