scholarly journals Conformance Control in Oil Reservoirs by Citric Acid-Coated Magnetite Nanoparticles

ACS Omega ◽  
2021 ◽  
Vol 6 (13) ◽  
pp. 9001-9012
Author(s):  
Hassan Divandari ◽  
Abdolhossein Hemmati-Sarapardeh ◽  
Mahin Schaffie ◽  
Maen M. Husein ◽  
Mohammad Ranjbar
Keyword(s):  
Citric Acid ◽  
Magnetite Nanoparticles ◽  
Oil Reservoirs ◽  
Conformance Control

A Study on a Copolymer Gelant With High Temperature Resistance for Conformance Control

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Lei Zhang ◽  
Cheng Jing ◽  
Jing Liu ◽  
Khan Nasir
Keyword(s):  
High Temperature ◽  
Oil Recovery ◽  
Oil Reservoirs ◽  
Conformance Control ◽  
Temperature Resistance ◽  
High Temperature Resistance ◽  
Long Time ◽  
Stable Performance ◽  
Water Cut ◽  
Hydrolyzed Polyacrylamide

Due to the limited temperature resistance, the deep conformance control technology of using the conventional hydrolyzed polyacrylamide (HPAM) gel failed to enhance oil recovery in high-temperature heterogeneous oil reservoirs. Therefore, it is necessary to develop a gelant with high temperature resistance to meet the demands of increasing oil production and decreasing water cut in high-temperature heterogeneous oil reservoirs. In this paper, a copolymer is first synthesized by the method of inverse emulsion polymerization using 2-acrylamide-2-tetradecyl ethyl sulfonic acid (AMC16S), acrylamide (AM), and acrylic acid (AA). The developed copolymer has a highly branching skeleton and can resist temperature up to 100 °C. And then, a gelant with high temperature resistance and good shear resistance can be formed by mixing a certain proportion of the developed copolymer and polyethyleneimine (PEI). After the controllable gelation, a copolymer gel is formed and the formed gel can maintain the stable performance for a long time in the high-temperature environment. Experimental results show that the developed gelant can be applied in the conformance control of high-temperature heterogeneous oil reservoir.

Evaluation of the Antimicrobial Activity of Citric Acid Functionalized Magnetite Nanoparticles

2020 ◽  
Vol EJMM29 (4) ◽  
pp. 143-149
Author(s):  
Ahmed M. El-Khawaga ◽  
Ayman A. Farrag ◽  
Ahmed I. El-Batal ◽  
Mohamed A. Elsayed
Keyword(s):  
Antimicrobial Activity ◽  
Citric Acid ◽  
Magnetite Nanoparticles ◽  
Pathogenic Bacteria ◽  
Average Particle Size ◽  
Maximum Activity ◽  
Precipitation Method ◽  
Average Particle ◽  
Effective Prevention ◽  
Fe3o4 Nps

Background: Antimicrobial resistance (AMR) has emerged as one of the principal public health problems of the 21st century that threatens the effective prevention and treatment of an ever-increasing range of infections caused by bacteria no longer susceptible to the common medicines used to treat them. Objectives: To development of Fe3O4 NPs with specific sizes and shapes Potential as a new antibacterial agent. Methodology: In this study magnetite nanoparticles (Fe3O4 NPs) were synthesized through an aqueous co-precipitation method and functionalized with citric acid for outstanding their antimicrobial potential. Fe3O4 NPs were characterized by XRD, TEM, SEM, EDX and FTIR to analyze crystallinity, average particle size, morphology and functional groups, respectively. Antimicrobial activity was investigated against pathogenic bacteria as zone of inhibition (ZOI) and minimum inhibitory concentration (MIC). Results: Antimicrobial results showed that CA- Fe3O4 NPs owns maximum activity against Staphylococcus aureus and E. coli by 18.0 and 15.0mm ZOI, respectively. Conclusion: It should be noted that (CA-Fe3O4) NPs are also active upon Gram-positive than Gram- negative bacteria. The synthesized (CA-Fe3O4) NPs are promising for potential applications as antimicrobial agent and in drug delivery fields.

Hydrophilic Magnetite Nanoparticles Enhance Anticancer Activity of Anthracyclines In Vitro

2016 ◽  
Vol 69 (11) ◽  
pp. 1247
Author(s):  
Bin Yang ◽  
Lin Luo ◽  
Ying Ma ◽  
Chunyan Chen ◽  
Xiaoming Chen ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Light Scattering ◽  
Citric Acid ◽  
Anticancer Activity ◽  
Magnetite Nanoparticles ◽  
Resonance Light Scattering ◽  
Novel Method ◽  
Dna Chain ◽  
Nano Fe3o4

A novel method for enhancing the anticancer activity of anthracyclines in vitro was proposed by using hydrophilic magnetic nanoparticles. Citric acid-coated magnetite nanoparticles Fe3O4 (nano-Fe3O4-CA) interacted with anthracyclines by electrostatic and hydrophobic forces, resulting in the formation of aggregates (nano-Fe3O4-CA-drug). The aggregate was studied by resonance light scattering and fluorescence spectroscopy. The results indicated that in comparison with anthracyclines, the nano-Fe3O4-CA-drug showed high activity towards incorporation in the DNA chain. Furthermore, the cytotoxicity of nano-Fe3O4-CA-drug was investigated by cytotoxicity experiment and cell morphology study. The results confirmed that the nano-Fe3O4-CA-drug could inhibit the growth of cells more effectively than the drug alone. In conclusion, usage of nano-Fe3O4-CA affords reduction of the dosage of anthracyclines in vitro.

scholarly journals Stability and Relaxation Mechanisms of Citric Acid Coated Magnetite Nanoparticles for Magnetic Hyperthermia

2013 ◽  
Vol 117 (10) ◽  
pp. 5436-5445 ◽  
Author(s):  
M. Elisa de Sousa ◽  
Marcela B. Fernández van Raap ◽  
Patricia C. Rivas ◽  
Pedro Mendoza Zélis ◽  
Pablo Girardin ◽  
...  
Keyword(s):  
Citric Acid ◽  
Magnetite Nanoparticles ◽  
Magnetic Hyperthermia

Mechanistic Investigation of Surfactant-Free Emulsion Polymerization Using Magnetite Nanoparticles Modified by Citric Acid as Stabilizers

Langmuir ◽  
2020 ◽  
Vol 36 (28) ◽  
pp. 8290-8300
Author(s):  
Keran Li ◽  
Linfeng Xie ◽  
Bin Wang ◽  
Jiahe Yan ◽  
Haoru Tang ◽  
...  
Keyword(s):  
Citric Acid ◽  
Emulsion Polymerization ◽  
Magnetite Nanoparticles ◽  
Mechanistic Investigation
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