Influence of Nanoparticles and Drop Size Distributions on the Rheology of w/o Pickering Emulsions

Hohl, Lena; Röhl, Susanne; Stehl, Dmitrij; Klitzing, Regine von; Kraume, Matthias

doi:10.1002/cite.201600063

Cited by 35 publications

(43 citation statements)

References 50 publications

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“…The applied sonication time led to stabilized suspensions without sedimentation in the relevant time scales. The reproducibility of the suspension preparation was described in more detail by Hohl et al . This is in agreement with results from Mondragon et al who investigated the influence of suspension sonication time for hydrophilic fumed silica particles in an aqueous phase and their influence on the reproducibility of rheology flow curve measurements.…”

Section: Methodssupporting

confidence: 86%

“…A detailed investigation on oscillating and rotational rheology measurements of the benzoyl chloride‐free system was performed by Hohl et al. . The shear thinning flow behavior for the suspension of 1‐dodecene with benzoyl chloride and partly hydrophobized silica nanoparticle suspensions is in agreement with previous results.…”

Section: Resultssupporting

confidence: 74%

“…The shear thinning flow behavior for the suspension of 1‐dodecene with benzoyl chloride and partly hydrophobized silica nanoparticle suspensions is in agreement with previous results. The addition of nanoparticles to the mixture leads to similar effects as in pure 1‐dodecene due to the equivalent flow curves . The higher viscosities of the organic phase (dispersed phase) in the presence of nanoparticles could induce an increase of the droplet sizes in stirred systems in comparison to particle‐free systems.…”

Section: Resultsmentioning

confidence: 94%

“…Fumed partly hydrophobized silica nanoparticles HDK H20® (Wacker) synthesized from silicon tetrachloride at high temperatures by a flame hydrolysis‐oxidation were applied. These pyrogenic particles form non‐spherical, chemically bonded aggregates , . The properties of the investigated nanoparticles are depicted in Tab.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Mass Transfer and Drop Size Distributions in Reactive Nanoparticle‐Stabilized Multiphase Systems

Petzold

Röhl

Hohl

et al. 2017

Chemie Ingenieur Technik

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Mass transfer in stirred liquid-liquid systems with and without silica nanoparticles is investigated for the saponification of benzoyl chloride. The mass transfer area is positively affected by the nanoparticles which lead to an increase of the liquidliquid interfacial area due to droplet coalescence hindrance. However, an additional mass transfer resistance induced by particles at the liquid-liquid interface was observed for all particle concentrations, since the high occupancy diminishes the available area for mass transfer. The ratio of the two oppositional effects needs to be determined to identify suitable nanoparticle reaction systems.

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Section: Methodssupporting

confidence: 86%

Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Mass Transfer and Drop Size Distributions in Reactive Nanoparticle‐Stabilized Multiphase Systems

Petzold

Röhl

Hohl

et al. 2017

Chemie Ingenieur Technik

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“…The fused aggregates of primary particles possess an average size of F v = 150 nm and F h = 50 nm . The irregular shape of the particles is clearly visible in scanning electron microsopy (SEM) images, as depicted for example in , .…”

Section: Methodsmentioning

confidence: 99%

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

Röhl

Hohl

Kempin

et al. 2019

Chemie Ingenieur Technik

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The impact of different silica nanoparticles on rheology, interfacial tension and drop size distributions in liquid‐liquid systems is determined experimentally. The particles vary in wettability and specific surface area. In contrast to commonly used high‐energy devices for Pickering emulsion preparation, low energy input by stirring allows to quantify drop breakage and coalescence in steady state and dynamic conditions. The experiments can provide essential information for drop size model development in nanoparticle‐stabilized emulsions.

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Continuous phase separation of stable emulsions from biphasic whole‐cell biocatalysis by catastrophic phase inversion

Janssen

Sadowski

Brandenbusch

2023

Biotechnology Journal

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The main bottleneck for the industrial implementation of highly promising multi-phase whole-cell biocatalytic processes is the formation of stable Pickering-type emulsions, hindering efficient downstream processing. Especially for the crucial step of phase separation, state-of-the-art processes require time-consuming and costly process steps (excessive centrifugation/use of de-emulsifiers). In contrast, using the phenomenon of catastrophic phase inversion (CPI), efficient phase separation can be achieved by addition of an excess dispersed phase within minutes. To show applicability of CPI as an innovative process step, a fully automated lab-scale prototype was designed and constructed within this work. A simple mixer-settler set-up enabled a continuous phase separation using CPI termed applied catastrophic phase inversion (ACPI). Test runs were conducted using emulsions from biphasic whole-cell biocatalysis (Escherichia coli JM101 and Pseudomonas putida KT2440 cells). Solvents used included n-heptane, ethyl oleate or 1-octanol as organic phase. These investigations revealed ideal process settings for a stable ACPI process (e.g., flow/stirring rates and volumetric phase ratios between organic and water phase). The knowledge of the CPI point is most crucial, as only the inverted state of emulsion is successfully destabilized.

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Influence of Nanoparticles and Drop Size Distributions on the Rheology of w/o Pickering Emulsions

Cited by 35 publications

References 50 publications

Mass Transfer and Drop Size Distributions in Reactive Nanoparticle‐Stabilized Multiphase Systems

Mass Transfer and Drop Size Distributions in Reactive Nanoparticle‐Stabilized Multiphase Systems

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

Continuous phase separation of stable emulsions from biphasic whole‐cell biocatalysis by catastrophic phase inversion

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