scholarly journals Single-Conidium Encapsulation in Oil-in-Water Pickering Emulsions at High Encapsulation Yield

2021 ◽  
Vol 9 ◽  
Author(s):  
Liliya Kotliarevski ◽  
Karthik Ananth Mani ◽  
Reut Amar Feldbaum ◽  
Noga Yaakov ◽  
Eduard Belausov ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Droplet Size ◽  
Pickering Emulsion ◽  
Mineral Oil ◽  
High Yield ◽  
Pickering Emulsions ◽  
Amine Functionalized ◽  
Oil In Water ◽  
The Stability

This study presents an individual encapsulation of fungal conidia in an oil-in-water Pickering emulsion at a single-conidium encapsulation yield of 44%. The single-conidium encapsulation yield was characterized by analysis of confocal microscopy micrographs. Mineral oil-in-water emulsions stabilized by amine-functionalized titania dioxide (TiO2-NH2 or titania-NH2) particles were prepared. The structure and the stability of the emulsions were investigated at different compositions by confocal microscopy and a LUMiSizer® respectively. The most stable emulsions with a droplet size suitable for single-conidium encapsulation were further studied for their individual encapsulation capabilities. The yields of individual encapsulation in the emulsions; i.e., the number of conidia that were individually encapsulated out of the total number of conidia, were characterized by confocal microscopy assay. This rapid, easy to use approach to single-conidium encapsulation, which generates a significantly high yield with eco-friendly titania-based emulsions, only requires commonly used emulsification and agitation methods.

Preparation of a synergistically stabilized oil-in-water paraffin Pickering emulsion for potential application in wood treatment

Holzforschung ◽  
2018 ◽  
Vol 72 (6) ◽  
pp. 489-497 ◽  
Author(s):  
Jun Jiang ◽  
Jinzhen Cao ◽  
Wang Wang ◽  
Haiying Shen
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Size Distribution ◽  
Droplet Size ◽  
Surface Hardness ◽  
Pickering Emulsion ◽  
Silica Particles ◽  
Morphological Properties ◽  
Pickering Emulsions ◽  
Oil In Water

AbstractPickering emulsions (emulsions stabilized by solid-state additives) are attractive as they have strong similarities with traditional surfactant-based emulsions. In this study, an oil-in-water (O/W) paraffin Pickering emulsion system with satisfying stability and small droplet size distribution was developed by hydrophilic silica particles and traditional surfactants as mixed emulsifiers. The droplet morphology and size distribution were observed by optical microscopy and a laser particle analyzer. The emulsion stability was improved and the droplet size was reduced after addition of a suitable amount of silica particles. The silica concentration of 1% showed the optimal effect among all the levels observed (0.1, 0.5, 1 and 2%). Wood was impregnated with the prepared emulsion, and the chemical and morphological properties of the product were investigated by Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) combined with energy-dispersed X-ray analysis (SEM-EDXA). Moreover, the hydrophobicity, thermal properties, surface hardness, axial compression strength (CS) and dynamic mechanical properties were tested. The silica was evenly distributed in the wood cell wall and thus there was a synergistic positive effect from the paraffin and silica in the cell wall leading to better hydrophobicity, improved surface hardness and mechanical properties including the thermal stability.

scholarly journals An Oligoimide Particle as a Pickering Emulsion Stabilizer

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1071 ◽  
Author(s):  
Yu-Jin Cho ◽  
Dong-Min Kim ◽  
In-Ho Song ◽  
Ju-Young Choi ◽  
Seung-Won Jin ◽  
...  
Keyword(s):  
Particle Concentration ◽  
Pickering Emulsion ◽  
Pickering Emulsions ◽  
Step Method ◽  
Wetting Properties ◽  
Emulsion Droplets ◽  
Step Procedure ◽  
Oil In Water ◽  
One Step ◽  
Oil Emulsions

A pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA)-based oligoimide (PMDA-ODA) was synthesized by a one-step procedure using water as a solvent. The PMDA-ODA particles showed excellent partial wetting properties and were stably dispersed in both water and oil phases. A stable dispersion was not obtained with comparison PMDA-ODA particles that were synthesized by a conventional two-step method using an organic solvent. Both oil-in-water and water-in-oil Pickering emulsions were prepared using the oligoimide particles synthesized in water, and the size of the emulsion droplet was controlled based on the oligoimide particle concentration. The oligoimide particles were tested to prepare Pickering emulsions using various kinds of oils. The oil-in-water Pickering emulsions were successfully applied to prepare microcapsules of the emulsion droplets. Our new Pickering emulsion stabilizer has the advantages of easy synthesis, no need for surface modification, and the capability of stabilizing both oil-in-water and water-in-oil emulsions.

scholarly journals Surfactant-Free Cellulose Filaments Stabilized Oil in Water Emulsions

2021 ◽  
Author(s):  
Amir Varamesh ◽  
Ragesh Prathapan ◽  
Ali Telmadarreie ◽  
Jia Li ◽  
Keith Gourlay ◽  
...  
Keyword(s):  
Droplet Size ◽  
Fluorescent Protein ◽  
Fluorescent Microscopy ◽  
Cellulose Nanofibrils ◽  
Continuous Phase ◽  
Carbohydrate Binding ◽  
Pickering Emulsions ◽  
Cellulosic Material ◽  
Oil In Water ◽  
Wide Range

Abstract There has been significant interest over recent years in the production and application of sustainable and green materials. Among these, nanocellulose has incurred great interest because of its exceptional properties and wide range of potential applications, including in Pickering emulsions. However, the production cost of these cellulosic materials has limited their application. In this study, the capability of a new type of cheaper cellulosic material, cellulose filaments (CFs), in formulating stable oil in water Pickering emulsions was investigated and compared with three conventional nanocelluloses, namely cellulose nanocrystals (CNCs), cellulose nanofibrils (CNFs) and TEMPO-oxidized CNFs (TEMPO-CNFs). Results showed that CFs can provide stable surfactant-free emulsions over wide ranges of salt concentration (0 – 500 mM) and pH (2 – 10), as indicated by the near constant oil droplet size and dewatering index of the emulsions. This is due to the ability of CFs to strongly adsorb to the oil and water interface, as evidenced by visualizing labeled CFs with engineered carbohydrate-binding module (CBM2a) conjugated with green fluorescent protein (CBM2a-eGFP) under fluorescent microscopy. Compared to the emulsions stabilized by other types of nanocelluloses, the CFs-stabilized emulsion demonstrated a larger average droplet size and comparable (with CNFs) or better (than CNCs and TEMPO-CNFs) stability, which is partially attributed to the higher viscosity of continuous phase in the presence of CFs. The results of this study demonstrate the use of CFs as a novel and cheaper cellulosic material for stabilizing emulsions, which opens the door to a range of markets from the food industry to engineering applications.

Effect of process parameters on emulsion stability and droplet size of pomegranate oil-in-water

2021 ◽  
Vol 72 (2) ◽  
pp. e410
Author(s):  
A.H. Kori ◽  
S.A. Mahesar ◽  
S.T.H. Sherazi ◽  
U.A. Khatri ◽  
Z.H. Laghari ◽  
...  
Keyword(s):  
Droplet Size ◽  
Process Parameters ◽  
Emulsion Stability ◽  
Methyl Cellulose ◽  
Carboxy Methyl Cellulose ◽  
Instability Index ◽  
Oil In Water ◽  
Food Applications ◽  
The Stability ◽  
Carboxy Methyl

The development of efficient emulsion is essential and requires a good understanding of the parameters that govern the formation and stability of the emulsion. The droplet size significantly affects the stability of the emulsion. In this study, the stability of pomegranate oil-in-water emulsions (0.5 to 7.0% v/v) was investigated using various emulsifiers in terms of droplet size and instability index during 16 days of storage. The Mastersizer and Lumisizer were used to measure the droplet size and instability index. It was observed that the minimum droplet size was achieved by using 0.3% carboxy methyl cellulose (5.37 μm) and maximum with 1.0/2.5% whey protein/maltodextrin (24.26 μm). The Lumisizer results during storage revealed the higher emulsion stability of carboxy methyl cellulose due to smaller droplet size and high thickness as compared to other emulsions studied. The findings of the present study would be useful for food applications to obtain fine and stable microcapsules.

Pickering-Type Emulsions of ODSA Sizing Agent Stabilized by Nano-Montmorillonite and N-Dodecane

2013 ◽  
Vol 319 ◽  
pp. 233-238 ◽  
Author(s):  
De Hai Yu ◽  
Zhao Yun Lin ◽  
You Ming Li
Keyword(s):  
Particle Concentration ◽  
Ph Value ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Paper Sizing ◽  
Oil In Water ◽  
Effects Of Ph ◽  
Oil Water ◽  
The Stability ◽  
Hydrolysis Resistance

Octadecenylsuccinic anhydride (ODSA) is an internal sizing agent used to hydrophobize paper and paper board in the process of papermaking. Nano-montmorillonite (MMT) particles and n-dodecane were used as the stabilizer to prepare stable ODSA Pickering emulsions. The effects of pH value, particle concentration, hydrolysis resistance and paper sizing performance of the ODSA Pickering emulsions were investigated. It was found that the stability of ODSA emulsions first increased and then decreased as the pH value decreased. More stable oil-in-water (o/w) emulsion can be made using 10 vol.% n-dodecane. Particle concentration was linked to the formation of particle films at oil–water interface, with a required minimum particle concentration of 1.5 wt.%. Paper sizing degree analysis indicated that the ODSA Pickering emulsions show increased hydrolysis resistance and good sizing performance.

scholarly journals Application of Pickering emulsion in oil drilling and production

2021 ◽  
Vol 11 (1) ◽  
pp. 26-39
Author(s):  
Lipei Fu ◽  
Qianli Ma ◽  
Kaili Liao ◽  
Junnan An ◽  
Jinmei Bai ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Petroleum Industry ◽  
Pickering Emulsion ◽  
Pickering Emulsions ◽  
Gas Field ◽  
Oil Drilling ◽  
Wide Range ◽  
Reservoir Conditions ◽  
Oil And Gas Field ◽  
The Stability

Abstract When surfactant is used as emulsifier, the stability of emulsion is often greatly reduced with the influence of reservoir conditions (temperature, pressure, salinity, etc.), which shortens the validity period of emulsion. Pickering emulsion has a wide range of applications in the oil and gas field due to its advantages of good stability and easy regulation. In this article, the formation, stabilization mechanism, and influencing factors of Pickering emulsions were introduced, and the application status and prospects of Pickering emulsions in oil and gas field were summarized. It was pointed out that Pickering emulsion has many advantages and important research value when applied in deep strata and complicated reservoirs. It is expected that this article can effectively reflect the application value of Pickering emulsion in oil and gas field and promote the application of Pickering emulsion in petroleum industry.

scholarly journals Rapid demulsification of pickering emulsions triggered by controllable magnetic field

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hui Yang ◽  
Shujuan Wang ◽  
Wei Zhang ◽  
Jiazhong Wu ◽  
Siyu Yang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Oil Recovery ◽  
Solid Particles ◽  
Pickering Emulsions ◽  
Irreversible Adsorption ◽  
Practical Applications ◽  
Oil In Water ◽  
Cyclic Utilization ◽  
The Stability ◽  
Promising Avenue

Abstract Pickering emulsions with on–off properties provide significant advantages over simple solid-stabilized emulsions for the development of novel materials, such as oil-displacing agents for enhanced oil recovery and templates for the fabrication of porous materials. However, the irreversible adsorption of particles as emulsion stabilizers endows the Pickering emulsions with kinetically stable property, resulting in a huge challenge to break the stability. Here we fabricated microscale Pickering emulsions, by the use of paramagnetic particles, which possess excellent stability for several months and more interestingly perform complete demulsification under controllable magnetic fields in several minutes. The alternating asymmetrical magnetic field endows oil-in-water droplets ‘‘big’’ N and S poles on the outer particle layers, and attracts the solid particles to the bottom of the vial after the coalescence and the deformation of the droplets, bringing the prevention of re-emulsion and the cyclic utilization. This facile strategy to produce stable Pickering emulsions with a magnetic-response opens a promising avenue for various practical applications including oil recovery, wastewater treatment, and sludge removal.

Sign in / Sign up

Export Citation Format

Share Document