scholarly journals Colloid–oil–water-interface interactions in the presence of multiple salts: charge regulation and dynamics

2017 ◽  
Vol 19 (22) ◽  
pp. 14345-14357 ◽  
Author(s):  
J. C. Everts ◽  
S. Samin ◽  
N. A. Elbers ◽  
J. E. S. van der Hoeven ◽  
A. van Blaaderen ◽  
...  
Keyword(s):  
Colloidal Particles ◽  
Water Interface ◽  
Charge Regulation ◽  
Oil Water

The salt-induced dislodgement of charged colloidal particles from an oil–water interface is investigated theoretically and experimentally.

scholarly journals Anomalous Long-Range Attraction in Colloidal Binary Mixtures at Fluid–Fluid Interfaces

2020 ◽  
Vol 4 (3) ◽  
pp. 36
Author(s):  
Zonglin Yi ◽  
To Ngai
Keyword(s):  
Long Range ◽  
Colloidal Particles ◽  
Experimental Result ◽  
Colloidal System ◽  
Fluid Interfaces ◽  
Water Interface ◽  
Two Dimensional ◽  
Colloidal Systems ◽  
Oil Water ◽  
Theoretical Side

The properties of binary colloidal systems have gained the interest of researchers because they have much richer structures than their one-component counterpart. Continuing efforts are being made on the theoretical side on binary colloidal systems, while many issues remained unsolved for the lack of solid experimental supports, especially for study in the field of two-dimensional (2D) binary colloids system. Oil–water interfaces can serve as a good stringent 2D confinement for colloidal particles and can avoid anomalous problems caused by the quasi-two-dimensional environment in previous experimental reports. In this work, we conduct experimental research of binary colloids system in an oil–water interface to revisit theoretical predication. We measure an ultra-long-range attraction and discuss the possible mechanism of this attraction by comparing the experimental result with existing model and theory. This study could contribute more understanding of the binary colloidal system in both experimental aspects and theoretical aspects.

scholarly journals Preparation of Pickering emulsions through interfacial adsorption by soft cyclodextrin nanogels

2015 ◽  
Vol 11 ◽  
pp. 2355-2364 ◽  
Author(s):  
Shintaro Kawano ◽  
Toshiyuki Kida ◽  
Mitsuru Akashi ◽  
Hirofumi Sato ◽  
Motohiro Shizuma ◽  
...  
Keyword(s):  
Colloidal Particles ◽  
Adsorption Property ◽  
Building Blocks ◽  
Pickering Emulsion ◽  
Surface Active Property ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Surface Active ◽  
Oil Water ◽  
Interfacial Adsorption

Background: Emulsions stabilized by colloidal particles are known as Pickering emulsions. To date, soft microgel particles as well as inorganic and organic particles have been utilized as Pickering emulsifiers. Although cyclodextrin (CD) works as an attractive emulsion stabilizer through the formation of a CD–oil complex at the oil–water interface, a high concentration of CD is normally required. Our research focuses on an effective Pickering emulsifier based on a soft colloidal CD polymer (CD nanogel) with a unique surface-active property. Results: CD nanogels were prepared by crosslinking heptakis(2,6-di-O-methyl)-β-cyclodextrin with phenyl diisocyanate and subsequent immersion of the resulting polymer in water. A dynamic light scattering study shows that primary CD nanogels with 30–50 nm diameter assemble into larger CD nanogels with 120 nm diameter by an increase in the concentration of CD nanogel from 0.01 to 0.1 wt %. The CD nanogel has a surface-active property at the air–water interface, which reduces the surface tension of water. The CD nanogel works as an effective Pickering emulsion stabilizer even at a low concentration (0.1 wt %), forming stable oil-in-water emulsions through interfacial adsorption by the CD nanogels. Conclusion: Soft CD nanogel particles adsorb at the oil–water interface with an effective coverage by forming a strong interconnected network and form a stable Pickering emulsion. The adsorption property of CD nanogels on the droplet surface has great potential to become new microcapsule building blocks with porous surfaces. These microcapsules may act as stimuli-responsive nanocarriers and nanocontainers.

Heterogeneous interface adsorption of colloidal particles

Soft Matter ◽  
2017 ◽  
Vol 13 (36) ◽  
pp. 6234-6242 ◽  
Author(s):  
Dong Woo Kang ◽  
Jin Hyun Lim ◽  
Bum Jun Park
Keyword(s):  
Colloidal Particles ◽  
Electrolyte Concentration ◽  
Water Phase ◽  
Water Interface ◽  
Oil Water ◽  
Particle Adsorption

Particle adsorption to an oil–water interface depends on the electrolyte concentration in the water phase.

scholarly journals Transition Behaviors of Configurations of Colloidal Particles at a Curved Oil-Water Interface

Materials ◽  
2016 ◽  
Vol 9 (3) ◽  
pp. 138 ◽  
Author(s):  
Mina Lee ◽  
Ming Xia ◽  
Bum Park
Keyword(s):  
Colloidal Particles ◽  
Water Interface ◽  
Oil Water

Surface Charge Regulation of Carboxyl Terminated Polystyrene Latex Particles and Their Interactions at the Oil/Water Interface

Langmuir ◽  
2014 ◽  
Vol 30 (41) ◽  
pp. 12164-12170 ◽  
Author(s):  
KyuHan Kim ◽  
Kyuheong Park ◽  
Gahee Kim ◽  
Hyunjung Kim ◽  
Myung Chul Choi ◽  
...  
Keyword(s):  
Surface Charge ◽  
Polystyrene Latex ◽  
Water Interface ◽  
Latex Particles ◽  
Charge Regulation ◽  
Oil Water ◽  
Polystyrene Latex Particles

Influence of an Additive-Free Particle Spreading Method on Interactions between Charged Colloidal Particles at an Oil/Water Interface

Langmuir ◽  
2016 ◽  
Vol 32 (19) ◽  
pp. 4909-4916 ◽  
Author(s):  
Peng Gao ◽  
Zonglin Yi ◽  
Xiaochen Xing ◽  
To Ngai ◽  
Fan Jin
Keyword(s):  
Colloidal Particles ◽  
Free Particle ◽  
Water Interface ◽  
Oil Water ◽  
Particle Spreading

Interaction between colloidal particles on an oil–water interface in dilute and dense phases

2015 ◽  
Vol 27 (19) ◽  
pp. 194119 ◽  
Author(s):  
Lucia Parolini ◽  
Adam D Law ◽  
Armando Maestro ◽  
D Martin A Buzza ◽  
Pietro Cicuta
Keyword(s):  
Colloidal Particles ◽  
Water Interface ◽  
Oil Water

Finite Ion-Size Effects Dominate the Interaction between Charged Colloidal Particles at an Oil-Water Interface

2010 ◽  
Vol 105 (4) ◽  
Author(s):  
Kasper Masschaele ◽  
Bum Jun Park ◽  
Eric M. Furst ◽  
Jan Fransaer ◽  
Jan Vermant
Keyword(s):  
Size Effects ◽  
Colloidal Particles ◽  
Water Interface ◽  
Oil Water ◽  
Ion Size

scholarly journals Measuring Inter-Particle Forces at an Interface With Optical Tweezers and a Long Working-Distance Objective Lens

2009 ◽  
Author(s):  
Daniel R. McAdams ◽  
Daniel G. Cole
Keyword(s):  
Optical Tweezers ◽  
Colloidal Particles ◽  
Force Measurement ◽  
Dipole Interaction ◽  
Mineral Oil ◽  
Objective Lens ◽  
Water Interface ◽  
Polystyrene Microspheres ◽  
Oil Water ◽  
Working Distance

In this effort, an optical tweezers setup is used to measure the forces between polystyrene microspheres on the interface between mineral oil and water. Colloidal interaction between particles on an interface is more complicated than their interaction in bulk. Knowing the forces between colloidal particles on an oil-water interface is important in order to improve aggregation and emulsion models and understand many phenomena in fluid dynamics and rheology. A two beam trap is used to control the distance between two interfacial particles. A long working-distance objective allows for the interface to be significantly far from the coverslip and for an extremely sensitive force measurement. The forces were found to follow a combination of Coulomb’s law and dipole-dipole interaction, but for much less charge than is specified by the manufacturer to be on the surface of the microspheres. These measurements will aid in the creation of models that can predict interfacial colloid phenomena.

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