Influence of Different Silica Nanoparticles on Drop Size Distributions in Agitated Liquid‐Liquid Systems

Röhl, Susanne; Hohl, Lena; Kempin, Maresa Vivien; Enders, Frauke; Jurtz, Nico; Kraume, Matthias

doi:10.1002/cite.201900049

Cited by 10 publications

(10 citation statements)

References 66 publications

(134 reference statements)

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“…4a)). The related standard deviations σ 0 / d 32 give a constant mean value of 0.31 ± 0.02 being in accordance with values reported for stirred systems under addition of surfactants or nanoparticles 8, 25. While for surfactant‐stabilized emulsions prepared via an in‐line high‐shear Silverson no clear correlation between span and rotor speed could be found 26, the width of the drop size distribution ( span 0 ) can be correlated with the ratio of tip speed and gap width using a power law model in this work (Fig.…”

Section: Resultssupporting

confidence: 89%

What Governs Pickering Emulsion Properties During Preparation via Batch Rotor‐Stator Homogenizers?

Kempin

Drews

2020

Chemie Ingenieur Technik

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Pickering emulsions have received increasing interest in many fields of application recently. In designing Pickering emulsion properties, focus is typically laid on composition whereas the preparation process as another possible leverage is not considered in detail. Here, Pickering emulsions of constant composition were prepared using two dispersing heads of a rotor‐stator homogenizer and compared in terms of Sauter mean diameters and rheology. It was found that the ratio of tip speed and gap width between rotor and stator is a better correlating parameter than tip speed only.

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Section: Resultssupporting

confidence: 89%

What Governs Pickering Emulsion Properties During Preparation via Batch Rotor‐Stator Homogenizers?

Kempin

Drews

2020

Chemie Ingenieur Technik

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“…Furthermore, Mickler et al used gap widths less than 5 mm to detect droplets in an isododecane−water system in an extraction column 33 and Roḧl et al used a gap width of 0.6 mm to study droplet sizes in an agitated n-heptane/water system with different silica nanoparticles. 29 Furthermore, Lichti and Bart studied air bubbles in mixtures of propanol/water and glycerol/water and used gap widths of 6.5 and 8 mm for these gas−liquid systems. 37 A measuring gap height of 3 mm is therefore argued to be a pragmatic choice for the olefin/water system.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Measuring Droplet Sizes Generated by 3D-Printed Stirrers in a Lean Gas–Liquid–Liquid System Using Borescopy

Schrimpf

Graefe

Vorholt

et al. 2022

Ind. Eng. Chem. Res.

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Photo-optical probes with automated image analysis are among the most promising measurement techniques for gas−liquid− liquid systems, but the literature on the application in lean water-in-oil dispersions is scarce. Taking water-in-1-octene as a model system, adhering droplets that severely cloud the images are successfully prevented using a polymeric disc made of polycarbonate or fluorinated ethylene propylene. Sharp bright-field imaging is enabled using a neither fully diffuse nor specular reflection pane. Various 3D-printed stirrers are characterized by their energy input, including gas-inducing modifications. Gas induction impairs the energy input of the stirrer and the imaging of droplets. Nevertheless, the measurement technique reliably provides droplet size distributions that exclude gas bubbles. Axial stirrers are preferable if one position at high stirring speeds is measured, as the homogeneity of droplet sizes along the reactor height is promoted. Radial stirrers are preferable if the stirring speed is varied, as the same trend of the droplets sizes is measurable along the reactor height. For radial stirring, the most beneficial position of the probe is close or slightly above the stirrer. The use of borescopy is thus found to be feasible if adhering droplets can be prevented and vision on droplets is not obstructed by too many bubbles.

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“…Up to now, image-based measurement methods are rather applied in liquid-liquid [9,10] and multiphase systems [11][12][13] together with bubble columns [14][15][16]36]. Analysis of droplet dispersions in a surrounding gas phase remain scarce.…”

Section: Image-based Measurement Methodsmentioning

confidence: 99%

Qualification of Image‐Based Measurement Systems for Characterization of Sprays

Schulz

Schunk²,

Schleicher³

et al. 2021

Chemie Ingenieur Technik

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Image-based measurement techniques become increasingly popular and expedite digitalization in chemical engineering. This article demonstrates their potential by testing two inline probes, namely modified optical multimode online probe (OMOP) and process microscope. Validations are performed with static monodisperse standards (9.2 mm to 406 mm) and fast-moving droplets (68.6 mm to 860.7 mm; 24.5 m s -1 to 11 m s -1 ). Screening of a lithography attests both probes great distortion-free image quality. A 1951 USAF chart attests a low optical resolution of 8 mm or 7 mm with respect to the OMOP or process microscope, respectively. The modified OMOP and process microscope reaches accuracies of 7.6 % or 5.9 % for particles and 8.2 % or 6.8 % for droplets.

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Influence of Different Silica Nanoparticles on Drop Size Distributions in Agitated Liquid‐Liquid Systems

Cited by 10 publications

References 66 publications

What Governs Pickering Emulsion Properties During Preparation via Batch Rotor‐Stator Homogenizers?

What Governs Pickering Emulsion Properties During Preparation via Batch Rotor‐Stator Homogenizers?

Measuring Droplet Sizes Generated by 3D-Printed Stirrers in a Lean Gas–Liquid–Liquid System Using Borescopy

Qualification of Image‐Based Measurement Systems for Characterization of Sprays

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