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.

Magnetorheological fluid based on amorphous Fe-Si-B alloy magnetic particles

2021 ◽  
pp. 1045389X2110643
Author(s):  
Chuncheng Yang ◽  
Zhong Liu ◽  
Xiangyu Pei ◽  
Cuiling Jin ◽  
Mengchun Yu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Rheological Property ◽  
Magnetic Particles ◽  
Annealing Treatment ◽  
Magnetorheological Fluid ◽  
The Stability ◽  
The Magnetic Field ◽  
Amorphous Particle ◽  
Better Than

Magnetorheological fluids (MRFs) based on amorphous Fe-Si-B alloy magnetic particles were prepared. The influence of annealing treatment on stability and rheological property of MRFs was investigated. The saturation magnetization ( Ms) of amorphous Fe-Si-B particles after annealing at 550°C is 131.5 emu/g, which is higher than that of amorphous Fe-Si-B particles without annealing. Moreover, the stability of MRF with annealed amorphous Fe-Si-B particles is better than that of MRF without annealed amorphous Fe-Si-B particles. Stearic acid at 3 wt% was added to the MRF2 to enhance the fluid stability to greater than 90%. In addition, the rheological properties demonstrate that the prepared amorphous particle MRF shows relatively strong magnetic responsiveness, especially when the magnetic field strength reaches 365 kA/m. As the magnetic field intensified, the yield stress increased dramatically and followed the Herschel-Bulkley model.

Design of the Magnetic Stamp Film for Electromagnetic-Assisted Transfer Printing

2021 ◽  
Vol 88 (7) ◽  
Author(s):  
Qingmin Yu ◽  
Anran Li ◽  
Xudong Yu ◽  
Honglei Zhou ◽  
Huanyu Cheng
Keyword(s):  
Magnetic Field ◽  
Theoretical Model ◽  
Applied Magnetic Field ◽  
Flexible Electronics ◽  
Interfacial Adhesion ◽  
Magnetic Particles ◽  
Magnetic Film ◽  
Transfer Printing ◽  
Maximum Displacement ◽  
Printing Process

Abstract As a critical step to integrate micro-nano electronic components on the soft substrate, transfer printing allows the facile fabrication of flexible electronics. The key to a successful transfer printing process is to modulate the interfacial adhesion strength at the stamp/device interface. As an advanced approach, electromagnetic-assisted transfer printing explores a sealed chamber with a magnetic stamp film at the bottom that can be reversibly actuated by the externally applied magnetic field. The deflected magnetic stamp film changes the pressure inside the chamber to modulate the interfacial adhesion at the stamp/device interface. Here, we investigate various design considerations and demonstrate a magnetic stamp film with magnetic NdFeB particles dispersed in a silicone polymer. A theoretical model is first established to study the reversible upward (or downward) deformation of the magnetic stamp film in a positive (or negative) magnetic field. The theoretical model reveals the effects of the mass fraction of the magnetic particles, the thickness of the magnetic film, and the magnetic field intensity on the deformation of the film and the transfer printing process. The theoretically predicted linear relationship between the maximum displacement of the magnetic film and the applied magnetic field is validated by finite element analysisand experimental results.

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.

Stability and Flow Properties of Oil-Based Foam Generated by CO2

SPE Journal ◽  
2019 ◽  
Vol 25 (01) ◽  
pp. 416-431 ◽  
Author(s):  
Songyan Li ◽  
Qun Wang ◽  
Zhaomin Li
Keyword(s):  
Porous Media ◽  
Oil Recovery ◽  
Foam Stability ◽  
Mobility Control ◽  
Flow In Porous Media ◽  
Recovery Efficiency ◽  
Oil Viscosity ◽  
Aqueous Foam ◽  
The Stability ◽  
Foam Flooding

Summary Foam flooding is an important method used to protect oil reservoirs and increase oil production. However, the research on foam fluid is generally focused on aqueous foam, and there are a few studies on the stability mechanism of oil-based foam. In this paper, a compound surfactant consisting of Span® 20 and a fluorochemical surfactant is determined as the formula for oil-based foam. The foam volume and half-life in the bulk phase are measured to be 275 mL and 302 seconds, respectively, at room temperature and atmospheric pressure. The stability mechanism of oil-based foam is proposed by testing the interfacial tension (IFT) and interfacial viscoelasticity. The lowest IFT of 18.5 mN/m and the maximum viscoelasticity modulus of 16.8 mN/m appear at the concentration of 1.0 wt%, resulting in the most-stable oil-based foam. The effect of oil viscosity and temperature on the properties of oil-based foam is studied. The foam stability increases first and then decreases with the rising oil viscosity, and the stability decreases with rising temperature. The apparent viscosity of oil-based foam satisfies the power-law non-Newtonian properties, and this viscosity is much higher than that of the phases of oil and CO2. The flow of oil-based foam in porous media is studied through microscopic-visualization experiments. Bubble division, bubble merging, and bubble deformation occur during oil-based-foam flow in porous media. The oil-recovery efficiency of the oil-based-foam flooding is 78.3%, while the oil-recovery efficiency of CO2 flooding is only 28.2%. The oil recovery is enhanced because oil-based foam reduces CO2 mobility, inhibits gas channeling, and improves sweep efficiency. The results are meaningful for CO2 mobility control and for the application of foam flooding for enhanced oil recovery (EOR).

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 Improving the Performance of Composite Hollow Fiber Membranes with Magnetic Field Generated Convection Application on pH Correction

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 445
Author(s):  
Aurelia Cristina Nechifor ◽  
Alexandru Goran ◽  
Vlad-Alexandru Grosu ◽  
Constantin Bungău ◽  
Paul Constantin Albu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Oil Recovery ◽  
Hollow Fiber ◽  
Power Plants ◽  
Magnetic Particles ◽  
Thermal Power ◽  
Variable Magnetic Field ◽  
Winter Period ◽  
Used Cooking Oil ◽  
Aluminum Ions

The membranes and membrane processes have succeeded in the transition from major technological and biomedical applications to domestic applications: water recycling in washing machines, recycling of used cooking oil, recovery of gasoline vapors in the pumping stations or enrichment of air with oxygen. In this paper, the neutralization of condensation water and the retention of aluminum from thermal power plants is studied using ethylene propylene diene monomer sulfonated (EPDM-S) membranes containing magnetic particles impregnated in a microporous propylene hollow fiber (I-PPM) matrix. The obtained membranes were characterized from the morphological and structural points of view, using scanning electron microscopy (SEM), high resolution SEM (HR-SEM), energy dispersive spectroscopy analysis (EDAX) and thermal gravimetric analyzer. The process performances (flow, selectivity) were studied using a variable magnetic field generated by electric coils. The results show the possibility of correcting the pH and removing aluminum ions from the condensation water of heating plants, during a winter period, without the intervention of any operator for the maintenance of the process. The pH was raised from an acidic one (2–4), to a slightly basic one (8–8.5), and the concentration of aluminum ions was lowered to the level allowed for discharge. Magnetic convection of the permeation module improves the pH correction process, but especially prevents the deposition of aluminum hydroxide on hollow fibers membranes.

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

scholarly journals Engineering motile aqueous phase-separated droplets via liposome stabilisation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shaobin Zhang ◽  
Claudia Contini ◽  
James W. Hindley ◽  
Guido Bolognesi ◽  
Yuval Elani ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Marangoni Effect ◽  
Living Systems ◽  
Biological Processes ◽  
Biological Applications ◽  
Emulsion System ◽  
Biotechnological Potential ◽  
New Directions ◽  
Directional Motion ◽  
The Stability

AbstractThere are increasing efforts to engineer functional compartments that mimic cellular behaviours from the bottom-up. One behaviour that is receiving particular attention is motility, due to its biotechnological potential and ubiquity in living systems. Many existing platforms make use of the Marangoni effect to achieve motion in water/oil (w/o) droplet systems. However, most of these systems are unsuitable for biological applications due to biocompatibility issues caused by the presence of oil phases. Here we report a biocompatible all aqueous (w/w) PEG/dextran Pickering-like emulsion system consisting of liposome-stabilised cell-sized droplets, where the stability can be easily tuned by adjusting liposome composition and concentration. We demonstrate that the compartments are capable of negative chemotaxis: these droplets can respond to a PEG/dextran polymer gradient through directional motion down to the gradient. The biocompatibility, motility and partitioning abilities of this droplet system offers new directions to pursue research in motion-related biological processes.

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