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 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.

scholarly journals Molecular Dynamics Simulation of Distribution and Diffusion Behaviour of Oil–Water Interfaces

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1905 ◽  
Author(s):  
Chengbin Zhang ◽  
Hanhui Dai ◽  
Pengfei Lu ◽  
Liangyu Wu ◽  
Bo Zhou ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Interface Roughness ◽  
Dynamics Simulation ◽  
Water Phase ◽  
Water Molecules ◽  
Water Interface ◽  
Oil Water ◽  
And Diffusion ◽  
Diffusion Behaviors

The distribution and diffusion behaviors of microscopic particles at fluorobenzene–water and pentanol–water interfaces are investigated using molecular dynamics simulation. The influences of Na+/Cl− ions and the steric effects of organic molecules are examined. The concentration distributions of different species, the orientations of oil molecules at the interface, and oil–water interface morphology as well as the diffusion behaviors of water molecules are explored and analyzed. The results indicate that a few fluorobenzene molecules move into the water phase influenced by Na+/Cl− ions, while the pentanol molecules at the interface prefer orientating their hydrophilic groups toward the water phase due to their large size. The water molecules more easily burst into the pentanol phase with larger molecular spaces. As the concentration of ions in the water phase increases, more water molecules enter into the pentanol molecules, leading to larger interface roughness and interface thickness. In addition, a lower diffusion coefficient for water molecules at the fluorobenzene–water interface are observed when introducing Na+/Cl− ions in the water phase, while for the pentanol–water system, the mobility of interfacial water molecules are enhanced with less ions and inhibited with more ions.

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

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

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.

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

Particle adsorption at the oil–water interface studied with second harmonic generation

Soft Matter ◽  
2019 ◽  
Vol 15 (38) ◽  
pp. 7672-7677 ◽  
Author(s):  
Wei Wu ◽  
Xinxin Liu ◽  
Shun-Li Chen ◽  
Qunhui Yuan ◽  
Wei Gan
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Water Interface ◽  
Polystyrene Nanoparticles ◽  
Oil Water ◽  
Particle Adsorption

In this work, energetics of the adsorption of polystyrene nanoparticles at the hexadecane–water interface was studied with second harmonic generation, which highlighted the significance of van der Waals interaction between oil phase and particles.

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