scholarly journals Inner Rotation of Pickering Janus Emulsions

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3312
Author(s):  
Rajarshi Roy Raju ◽  
Joachim Koetz
Keyword(s):  
Magnetic Field ◽  
Gold Nanoparticles ◽  
Olive Oil ◽  
Silicone Oil ◽  
Core Shell ◽  
Water Interface ◽  
Pickering Emulsions ◽  
The Core ◽  
Oil Water ◽  
Inner Parts

Janus droplets were prepared by vortex mixing of three non-mixable liquids, i.e., olive oil, silicone oil and water, in the presence of gold nanoparticles (AuNPs) in the aqueous phase and magnetite nanoparticles (MNPs) in the olive oil. The resulting Pickering emulsions were stabilized by a red-colored AuNP layer at the olive oil/water interface and MNPs at the oil/oil interface. The core–shell droplets can be stimulated by an external magnetic field. Surprisingly, an inner rotation of the silicon droplet is observed when MNPs are fixed at the inner silicon droplet interface. This is the first example of a controlled movement of the inner parts of complex double emulsions by magnetic manipulation via interfacially confined magnetic nanoparticles.

scholarly journals Modeling of Sedimentation and Creaming in Suspensions and Pickering Emulsions

Fluids ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 186 ◽  
Author(s):  
Rajinder Pal
Keyword(s):  
Modeling And Simulation ◽  
Strong Influence ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Hindered Settling ◽  
Drift Flux ◽  
Three Phase ◽  
Oil Water ◽  
Single Droplets ◽  
Emulsions And Suspensions

Suspensions and emulsions are prone to kinetic instabilities of sedimentation and creaming, wherein the suspended particles and droplets fall or rise through a matrix fluid. It is important to understand and quantify sedimentation and creaming in such dispersed systems as they affect the shelf-life of products manufactured in the form of suspensions and emulsions. In this article, the unhindered and hindered settling/creaming behaviors of conventional emulsions and suspensions are first reviewed briefly. The available experimental data on settling/creaming of concentrated emulsions and suspensions are interpreted in terms of the drift flux theory. Modeling and simulation of nanoparticle-stabilized Pickering emulsions are carried out next. The presence of nanoparticles at the oil/water interface has a strong influence on the creaming/sedimentation behaviors of single droplets and swarm of droplets. Simulation results clearly demonstrate the strong influence of three-phase contact angle of nanoparticles present at the oil/water interface. This is the first definitive study dealing with modeling and simulation of unhindered and hindered creaming and sedimentation behaviors of nanoparticle-stabilized Pickering emulsions.

Aromatic thiol-modulated Ag overgrowth on gold nanoparticles: tracking the thiol's position in the core–shell nanoparticles

Nanoscale ◽  
2019 ◽  
Vol 11 (37) ◽  
pp. 17471-17477 ◽  
Author(s):  
Jiaqi Chen ◽  
Dejing Meng ◽  
Hui Wang ◽  
Haiyun Li ◽  
Yinglu Ji ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Growth Process ◽  
Shell Growth ◽  
Core Shell ◽  
Internal Reference ◽  
Shell Nanoparticles ◽  
Aromatic Thiol ◽  
The Core ◽  
Spatial Trajectory ◽  
Core Shell Nanoparticles

Using DMAB as the Raman internal reference, the spatial trajectory of modulating 4-ATP molecules was tracked during the shell growth process.

Gelation of a Monoclonal Antibody at the Silicone Oil–Water Interface and Subsequent Rupture of the Interfacial Gel Results in Aggregation and Particle Formation

2015 ◽  
Vol 104 (4) ◽  
pp. 1282-1290 ◽  
Author(s):  
Shyam B. Mehta ◽  
Rachael Lewus ◽  
Jared S. Bee ◽  
Theodore W. Randolph ◽  
John F. Carpenter
Keyword(s):  
Monoclonal Antibody ◽  
Silicone Oil ◽  
Particle Formation ◽  
Water Interface ◽  
Oil Water

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 Designing biopolymer-coated Pickering emulsions to modulate in vitro gastric digestion: a static model study

2019 ◽  
Vol 10 (9) ◽  
pp. 5498-5509 ◽  
Author(s):  
Andrea Araiza-Calahorra ◽  
Anwesha Sarkar
Keyword(s):  
Static Model ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Gastric Digestion ◽  
Electrostatic Deposition ◽  
Model Study ◽  
Oil Water

The aim of this study was to restrict the degree of gastric destabilization of Pickering emulsions by using electrostatic deposition of a biopolymeric layer at the proteinaceous particle–laden oil–water interface.

A Thermogravimetric Study of Alakanethiolate Monolayer-Capped Gold Nanoparticle Catalysts

2003 ◽  
Vol 789 ◽  
Author(s):  
Mathew M. Maye ◽  
Sandy Chen ◽  
Wai-Ben Chan ◽  
Lingyan Wang ◽  
Peter Njoki ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Composition ◽  
Model System ◽  
Core Shell ◽  
Oxidation Of Co ◽  
Nanoparticle Catalysts ◽  
The Core ◽  
Catalytic Application ◽  
Treatment Conditions ◽  
Shell Composition

ABSTRACTThe application of molecularly-capped gold nanoparticles (1–5 nm) in catalysis (e.g., electrocatalytic oxidation of CO and methanol) requires a thorough understanding of the surface composition and structural properties. Gold nanoparticles consisting of metallic or alloy cores and organic encapsulating shells serve as an intriguing model system. One of the challenges for the catalytic application is the ability to manipulate the core and the shell properties in controllable ways. There is a need to understand the relative core-shell composition and the ability to remove the shell component under thermal treatment conditions. In this paper, we report results of a thermogravimetric analysis of the alkanethiolate monolayer-capped gold nanoparticles. This investigation is aimed at enhancing our understanding of the relative core-shell composition and thermal profiles.

scholarly journals Мёссбауэровские исследования состава и магнитной структуры нанокомпозитов Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/γ-Fe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- типа ядро-оболочка во внешнем магнитном поле (Часть 2)

2020 ◽  
Vol 62 (11) ◽  
pp. 1919
Author(s):  
А.С. Камзин ◽  
I.M. Obaidat ◽  
А.А. Валлиулин ◽  
В.Г. Семенов ◽  
I.A. Al-Omari
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Structure ◽  
Magnetic Moments ◽  
Core Shell ◽  
Fe2o3 Nanoparticles ◽  
Synthesis Conditions ◽  
The Core ◽  
Canted Spin ◽  
Shell Particles

The results of Mössbauer studies of the composition and magnetic structure of Fe3O4 / -Fe2O3 nanoparticles placed in an external magnetic field with a strength of 1.8 kOe, which is a continuation of the work [A.S. Kamzin, I.M. Obaidat, A.A. Valliulin, V.G. Semenov, I.A. Al-Omari. FTT No. 10/2020]. It is shown that the thickness of the maghemite (-Fe2O3) shell can be changed by the synthesis conditions. It was found that on the surface of the maghemite (-Fe2O3) shell in the Fe3O4 / -Fe2O3 nanocomposites there is a layer in which the magnetic moments are not oriented collinearly to the moments located in the depth of the shell, i.e., there is a canted spin structure. An intermediate layer in the spin-glass state is formed between the core and the shell. The data obtained on the structure of core / shell particles are important for understanding the properties of nanocomposites, which are of great interest for applications in various fields, including biomedicine.

Sign in / Sign up

Export Citation Format

Share Document