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.

Oil recovery method in ice conditions by means of magnetic field and finely dispersed magnetite

2020 ◽  
Vol 10 (5) ◽  
pp. 514-521
Author(s):  
Аlexander V. Salnikov ◽  
◽  
Аlexander А. Lyutoev ◽  
Mikhail A. Troshin ◽  
Arina V. Nikolaeva ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Oil Recovery ◽  
Magnetic Particles ◽  
Oil Spills ◽  
Solid Particles ◽  
Spherical Particles ◽  
Pickering Emulsions ◽  
Recovery Method ◽  
Oil Emulsion ◽  
Innovative Solution

The oil spill response using skimmer systems in the glacial seas continues to be relevant in world practice. A complex approach based on the combination of oil slick dispersion by solid fine magnetic particles and skimmer cleaning, the operative parts of which are equipped with metallic magnetized bristles, has been proposed as a promising and innovative solution. Application of finely dispersed magnetite – ferromagnetic spherical particles (iron oxides) as fine solid particles to create stable Pickering emulsions with formation of oil-ferromagnetic units is considered. Mathematical modeling has been performed to estimate the possibility of extraction of such oil-ferromagnetic units from water-oil emulsion under the influence of nonhomogeneous magnetic field created by magnetized steel bristles of skimmer operative parts. The results obtained confirmed the possibility of a practical application of the solution proposed by the authors to improve the efficiency of mechanical cleaning of oil spills in glacial seas.

scholarly journals New Trends in Natural Emulsifiers and Emulsion Technology for the Food Industry

2021 ◽  
Author(s):  
Arantzazu Santamaria-Echart ◽  
Isabel P. Fernandes ◽  
Samara C. Silva ◽  
Stephany C. Rezende ◽  
Giovana Colucci ◽  
...  
Keyword(s):  
Circular Economy ◽  
Food Industry ◽  
Solid Particles ◽  
Microbial Fermentation ◽  
Bibliometric Data ◽  
Pickering Emulsions ◽  
Double Emulsions ◽  
Oil In Water ◽  
Food Applications ◽  
New Generation

The food industry depends on using different additives, which increases the search for effective natural or natural-derived solutions, to the detriment of the synthetic counterparts, a priority in a biobased and circular economy scenario. In this context, different natural emulsifiers are being studied to create a new generation of emulsion-based products. Among them, phospholipids, saponins, proteins, polysaccharides, biosurfactants (e.g., compounds derived from microbial fermentation), and organic-based solid particles (Pickering stabilizers) are being used or start to gather interest from the food industry. This chapter includes the basic theoretical fundamentals of emulsions technology, stabilization mechanisms, and stability. The preparation of oil-in-water (O/W) and water-in-oil (W/O) emulsions, the potential of double emulsions, and the re-emerging Pickering emulsions are discussed. Moreover, the most relevant natural-derived emulsifier families (e.g., origin, stabilization mechanism, and applications) focusing food applications are presented. The document is grounded in a bibliographic review mainly centered on the last 10-years, and bibliometric data was rationalized and used to better establish the hot topics in the proposed thematic.

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 Индуцированные магнитным полем спин-модуляционные переходы в эпитаксиальных плeнках BiFeO-=SUB=-3-=/SUB=- с ориентацией (001)

2019 ◽  
Vol 61 (2) ◽  
pp. 248
Author(s):  
Н.Е. Кулагин ◽  
А.Ф. Попков ◽  
С.В. Соловьёв ◽  
А.К. Звездин
Keyword(s):  
Magnetic Field ◽  
Strain Engineering ◽  
Homogeneous State ◽  
Induced Anisotropy ◽  
Practical Applications ◽  
Homogeneous Phase ◽  
Growing Domain ◽  
The Stability ◽  
Induced Changes ◽  
The Magnetic Field

AbstractAlterations in the ground state of thin (001) films of a BiFeO_3 (BFO)-type multiferroic in a magnetic field are studied theoretically, with changes in the energy of induced anisotropy taken into account. The anisotropy vs. field phase diagrams identifying the stability regions of homogeneous antiferromagnetic states and the regions of emergence of spatially modulated antiferromagnetic states are constructed for three mutually orthogonal orientations of applied magnetic field. We show that, as the magnetic field decreases, the transformation of a homogeneous phase into a spatially modulated state occurs at the instability point of the homogeneous state via gradual emergence of the conical phase that transforms into a planar cycloid with the decreasing magnetic field. A multiferroic film grown on a (001) substrate develops considerable anisotropy of the energy of spatially modulated state, depending on the modulation orientation. Meanwhile, cycloids with different orientations undergo the transitions from incommensurate phase into the homogeneous state differently: either the conical cycloid is formed followed by its collapse into the homogeneous state or an unlimitedly growing domain of the homogeneous phase is formed within the flat cycloid. Examples of field-induced changes in magnetization, with changes in spin states taken into account, are provided. These results are of value in practical applications of multiferroic strain engineering.

scholarly journals Directional motion of the foam carrying oils driven by the magnetic field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiaoxiao Dou ◽  
Zhewen Chen ◽  
Pingcheng Zuo ◽  
Xiaojian Cao ◽  
Jianlin Liu
Keyword(s):  
Magnetic Field ◽  
Oil Recovery ◽  
Magnetic Particles ◽  
Scaling Laws ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Micro Fluidics ◽  
Directional Motion ◽  
The Stability ◽  
Foam Flooding

AbstractFoams are substances widely used the foam flooding technology, which aim to greatly improve the residual oil recovery. In the present study, we perform a comprehensive investigation on the oil removal process driven by the foam embedded with magnetic particles, under the action of the magnetic force. The experiment shows that the addition of magnetic particles has little effect on the stability of the foam. During the motion of the foam, its maximum displacement and maximum acceleration are fully explored. Such factors as the volume of the foam, the volume of the oil droplet, the mass concentration of magnetic particles, and the Young’s contact angle of surfactant on solid are surveyed in detail. The function curves of the maximum displacement and the maximum acceleration with respect to these variables are obtained in the experiment, and the selection of some optimal parameters is advised. Moreover, the dimensional analysis has been conducted and several scaling laws are given, which are in agreement with the experimental results. These findings are beneficial to understand the oil displacement with the aid of magnetic field, which also provide some inspirations on drug delivery, robots and micro-fluidics.

Surfactants

2019 ◽  
Author(s):  
Bob Aveyard
Keyword(s):  
Liquid Crystalline ◽  
Film Formation ◽  
Thin Liquid Film ◽  
Colloidal Dispersions ◽  
Surface Forces ◽  
Solid Particles ◽  
Pickering Emulsions ◽  
Adsorbed Particle ◽  
Particle Adsorption ◽  
The Stability

Characteristically, surfactants in aqueous solution adsorb at interfaces and form aggregates (micelles of various shapes and sizes, microemulsion droplets, and lyotropic liquid crystalline phases). This book is about the behaviour of surfactants in solution, at interfaces, and in colloidal dispersions. Adsorption at liquid/fluid and solid/liquid interfaces, and ways of characterizing the adsorbed surfactant films, are explained. Surfactant aggregation in systems containing only an aqueous phase and in systems with comparable volumes of water and nonpolar oil are each considered. In the latter case, the surfactant distribution between oil and water and the behaviour of the resulting Winsor systems are central to surfactant science and to an understanding of the formation of emulsions and microemulsions. Surfactant layers on particle or droplet surfaces can confer stability on dispersions including emulsions, foams, and particulate dispersions. The stability is dependent on the surface forces between droplet or particle surfaces and the way in which they change with particle separation. Surface forces are also implicated in wetting processes and thin liquid film formation and stability. The rheology of adsorbed films on liquids and of bulk colloidal dispersions is covered in two chapters. Like surfactant molecules, small solid particles can adsorb at liquid/fluid interfaces and the final two chapters focus on particle adsorption, the behaviour of adsorbed particle films and the stabilization of Pickering emulsions.

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.

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