Emulsification synergism in mixtures of polyelectrolyte brush-grafted nanoparticles and surfactants

Saigal, Trishna; Xu, Joyce; Matyjaszewski, Krzysztof; Tilton, Robert D.

doi:10.1016/j.jcis.2014.12.047

Cited by 12 publications

(7 citation statements)

References 38 publications

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“…This complexation creates a rich landscape for tailoring emulsification. Adding small SDS concentrations to a Si‐PDMAEMA suspension was found to synergistically enhance emulsification efficiency for cyclohexane‐in‐water and xylene‐in‐water, even though SDS by itself did not yield particularly stable emulsions . Synergism resulted from the increased hydrophobicity of the complex.…”

Section: High Efficiency Emulsifiersmentioning

confidence: 97%

Opportunities for complex fluids engineering with nanoparticulate polymer brushes

Tilton

2018

AIChE Journal

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Section: High Efficiency Emulsifiersmentioning

confidence: 97%

Opportunities for complex fluids engineering with nanoparticulate polymer brushes

Tilton

2018

AIChE Journal

Self Cite

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“…Saigal and coworkers investigated the interactions between poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA)-grafted silica nanoparticles and three kinds of molecular surfactants, the anionic surfactant SDS, the non-ionic water-soluble surfactant Triton X-100 and the non-ionic oil-soluble surfactant Span 85, respectively (Saigal et al, 2015 ). Emulsification efficacy was improved with SDS at low concentrations range, where particle absorption is enhanced due to the complexation between PDMAEMA and SDS.…”

Section: Tailoring the Wettability By Surface Chemistrymentioning

confidence: 99%

Tailoring the Wettability of Colloidal Particles for Pickering Emulsions via Surface Modification and Roughness

Xiao

Zhang

et al. 2018

Front. Chem.

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Pickering emulsions are water or oil droplets that are stabilized by colloidal particles and have been intensely studied since the late 90s. The surfactant-free nature of these emulsions has little adverse effects such as irritancy and contamination of environment and typically exhibit enhanced stability compared to surfactant-stabilized emulsions. Therefore, they offer promising applications in cosmetics, food science, controlled release, and the manufacturing of microcapsules and porous materials. The wettability of the colloidal particles is the main parameter determining the formation and stability of Pickering emulsions. Tailoring the wettability by surface chemistry or surface roughness offers considerable scope for the design of a variety of hybrid nanoparticles that may serve as novel efficient Pickering emulsion stabilizers. In this review, we will discuss the recent advances in the development of surface modification of nanoparticles.

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“…It is very likely that the complex interactions between these three entities contribute to the extra stability of the MPE formed. 21 Eventually, a monodispersed MPE was prepared and used as a modeled system for the study of magnetophoretic separation under a low gradient magnetic field at the macroscopic and microscopic scale. 22 Particularly, the mathematical analysis will be conducted on the kinetics data collected at the macroscale and transport phenomena data collected at the microscale.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Here, we propose the combinatorial use of IONPs, polystyrenesulfonate (PSS), and cetrimonium bromide (CTAB) as the mixture of emulsifiers to stabilize the MPE. It is very likely that the complex interactions between these three entities contribute to the extra stability of the MPE formed . Eventually, a monodispersed MPE was prepared and used as a modeled system for the study of magnetophoretic separation under a low gradient magnetic field at the macroscopic and microscopic scale .…”

Section: Introductionmentioning

confidence: 99%

Magnetophoresis of Magnetic Pickering Emulsions Under Low Field Gradient: Macroscopic and Microscopic Motion

Tham

Leong

et al. 2021

Langmuir

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Monodispersed iron oxide nanoparticles (IONPs) coated with polystyrenesulfonate (PSS) and cetrimonium bromide (CTAB) have been used to stabilize magnetic Pickering emulsions (MPEs). Magnetophoresis of MPEs under the influence of a low gradient magnetic field (∇B < 100 T/m) was investigated at the macroscopic and microscopic scale. At the macroscopic scale, for the case of pH 7, the MPE achieved a magnetophoretic velocity of 70.9 μm/s under the influence of ∇B at 93.8 T/m. The magnetic separation efficiency of the MPE at 90% was achieved within 30 min for pH 3, 7, and 10. At pH 10, the colloidal stability of the MPE was the lowest compared to that for pH 3 and 7. Thus, MPE at pH 10 required the shortest time for achieving the highest separation efficiency, as the MPE experienced cooperative magnetophoresis at alkaline pH. The creaming rate of the MPE at all conditions was still lower compared to magnetophoresis and was negligible in influencing its separation kinetics profiles. At the microscopic scale, the migration pathways of the MPEs (with diameters between 2.5 and 7.5 μm) undergoing magnetophoresis at ∇B ∼ 13.0 T/m were recorded by an optical microscope. From these experiments, and taking into consideration the MPE size distribution from the dynamic light scattering (DLS) measurement, we determined the averaged microscopic magnetophoretic velocity to be 7.8 ± 5.5 μm/s. By making noncooperative magnetophoresis assumptions (with negligible interactions between the MPEs along their migration pathways), the calculated velocity of individual MPEs was 9.8 μm/s. Such a value was within the percentage error of the experimental result of 7.8 ± 5.5 μm/s. This finding allows for an easy and quick estimation of the magnetophoretic velocity of MPEs at the microscale by using macroscopic separation kinetics data.

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Emulsification synergism in mixtures of polyelectrolyte brush-grafted nanoparticles and surfactants

Cited by 12 publications

References 38 publications

Opportunities for complex fluids engineering with nanoparticulate polymer brushes

Opportunities for complex fluids engineering with nanoparticulate polymer brushes

Tailoring the Wettability of Colloidal Particles for Pickering Emulsions via Surface Modification and Roughness

Magnetophoresis of Magnetic Pickering Emulsions Under Low Field Gradient: Macroscopic and Microscopic Motion

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