Oleic acid coating on the monodisperse magnetite nanoparticles

2006 ◽  
Vol 253 (5) ◽  
pp. 2611-2617 ◽  
Author(s):  
Ling Zhang ◽  
Rong He ◽  
Hong-Chen Gu
Keyword(s):  
Oleic Acid ◽  
Magnetite Nanoparticles ◽  
Acid Coating

scholarly journals High Encapsulation Efficiency of Magnetite Nanoparticles in Hydrophobic Polymer Microcapsules using Microsuspension Conventional Radical Polymerization

2019 ◽  
Vol 35 (2) ◽  
pp. 516-522 ◽  
Author(s):  
Jittaya Sadchaiyaphum ◽  
Pongsathon Phapugrangkul ◽  
Preeyporn Chaiyasat ◽  
Amorn Chaiyasat
Keyword(s):  
Aqueous Solution ◽  
Oleic Acid ◽  
Radical Polymerization ◽  
Magnetite Nanoparticles ◽  
Driving Force ◽  
Encapsulation Efficiency ◽  
Polymer Particle ◽  
Polymer Shell ◽  
Hydrophobic Polymer ◽  
Co Precipitation

High encapsulation efficiency of magnetite nanoparticles (MNPs; Fe3O4) in microcapsules using PDVB as a hydrophobic polymer shell was successfully achieved by microsuspension conventional radical polymerization (ms CRP). MNPs were initially synthesized by co-precipitation of Fe2+/Fe3+ in a binary phase. During the nucleation of MNPs in alkaline aqueous solution existing oleic acid (OA), MNPs were coated with OA (MNPs-OA) before moving to the toluene phase with the addition of salt. At OA concentration of 0.3 wt%, most of the nucleated MNPs were hydrophobic and well dispersed in the toluene phase. Using DVB as a monomer for ms CRP, high encapsulation efficiency (92 %EE) of MNPs-OA was obtained, with low free polymer particle formation. By contrast, large amounts of free polymer particles were observed at low %EE (32%) of MNPs. The main driving force for high %EE was obtained by coating the surface of the MNPs by OA which increased hydrophobicity.

Demulsification of Oleic-Acid-Coated Magnetite Nanoparticles for Cyclohexane-in-Water Nanoemulsions

2014 ◽  
Vol 28 (9) ◽  
pp. 6172-6178 ◽  
Author(s):  
Jiling Liang ◽  
Haiping Li ◽  
Jingen Yan ◽  
Wanguo Hou
Keyword(s):  
Oleic Acid ◽  
Magnetite Nanoparticles

scholarly journals Synthesis of functionalized magnetite nanoparticles using only oleic acid and iron (III) acetylacetonate

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Eupídio Scopel ◽  
Patrick Pires Conti ◽  
Daniel Grando Stroppa ◽  
Cleocir José Dalmaschio
Keyword(s):  
Oleic Acid ◽  
Magnetite Nanoparticles

Influence of citric acid and oleic acid coating on the dc magnetic properties of Fe3O4 magnetic nanoparticles

2020 ◽  
Vol 20 ◽  
pp. 21-24 ◽  
Author(s):  
M. Polichetti ◽  
M. Modestino ◽  
A. Galluzzi ◽  
S. Pace ◽  
M. Iuliano ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oleic Acid ◽  
Magnetic Nanoparticles ◽  
Citric Acid ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Acid Coating

Magnetite nanoparticles coated with oleic acid: accumulation in hepatopancreatic cells of the mangrove crab Ucides cordatus

2018 ◽  
Vol 25 (35) ◽  
pp. 35672-35681
Author(s):  
Hector Aguilar Vitorino ◽  
Priscila Ortega ◽  
Roxana Y. Pastrana Alta ◽  
Flavia Pinheiro Zanotto ◽  
Breno Pannia Espósito
Keyword(s):  
Oleic Acid ◽  
Magnetite Nanoparticles ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Acid Accumulation

scholarly journals Cloud condensation nuclei activity of CaCO<sub>3</sub> particles with oleic acid and malonic acid coatings

2018 ◽  
Vol 18 (10) ◽  
pp. 7345-7359 ◽  
Author(s):  
Mingjin Wang ◽  
Tong Zhu ◽  
Defeng Zhao ◽  
Florian Rubach ◽  
Andreas Wahner ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Malonic Acid ◽  
Volume Fraction ◽  
Cloud Condensation Nuclei ◽  
Water Soluble ◽  
Coating Process ◽  
Condensation Nuclei ◽  
Mineral Particles ◽  
Acid Coating ◽  
Ccn Activity

Abstract. Condensation of carboxylic acids on mineral particles leads to coatings and impacts the particles' potential to act as cloud condensation nuclei (CCN). To determine how the CCN activity of mineral particles is impacted by carboxylic acid coatings, the CCN activities of CaCO3 particles and CaCO3 particles with oleic acid and malonic acid coatings were compared in this study. The results revealed that small amounts of oleic acid coating (volume fraction (vf) ≤4.3 %) decreased the CCN activity of CaCO3 particles, while more oleic acid coating (vf ≥16 %) increased the CCN activity of CaCO3 particles. This phenomenon has not been reported before. In contrast, the CCN activity of CaCO3 particles coated with malonic acid increased with the thickness of the malonic acid coating (vf =0.4–40 %). Even the smallest amounts of malonic acid coating (vf =0.4 %) significantly enhanced the CCN activity of CaCO3 particles from κ=0.0028±0.0001 to κ=0.0123±0.0005. This indicates that a small amount of water-soluble organic acid coating may significantly enhance the CCN activity of mineral particles. The presence of water vapor during the coating process with malonic acid additionally increased the CCN activity of the coated CaCO3 particles, probably because more CaCO3 reacts with malonic acid when sufficient water is available.

A facile green approach for synthesizing monodisperse magnetite nanoparticles

2010 ◽  
Vol 25 (5) ◽  
pp. 810-813 ◽  
Author(s):  
Ling Li ◽  
Jun Ding ◽  
Junmin Xue
Keyword(s):  
Oleic Acid ◽  
Magnetite Nanoparticles ◽  
Synthetic Methods ◽  
Capping Agent ◽  
High Quality ◽  
Green Approach ◽  
Surfactant Complex ◽  
Acid Ratio ◽  
Size And Morphology ◽  
Controllable Size

The synthesis of monodisperse magnetite nanoparticles (Fe3O4 NPs) has been widely investigated over the last decade. Among the various synthetic methods, thermal decomposition of iron acetylacetonate, Fe(acac)3, or the premade iron-surfactant complex, was demonstrated to be promising to obtain monodisperse Fe3O4 NPs with controllable size and morphology. However, toxic and expensive precursors or tedious experimental procedures are normally required in these approaches. In this communication, we report a facile chemical top-down method to synthesize monodisperse magnetite NPs by using rust, which is mainly composed of γ-Fe2O3, as the iron source and oleic acid as the capping agent. The particle size, and hence the magnetization, of NPs can be readily controlled by adjusting the rust/oleic acid ratio and reaction temperature. This process is a green chemical approach and is easy to be reproduced and scaled up, which could be developed as an effective way to convert waste materials into high quality nanocrystals.

Electrically conductive and hydrophobic cotton fabrics by polypyrrole-oleic acid coating

2013 ◽  
Vol 14 (5) ◽  
pp. 703-709 ◽  
Author(s):  
Alessio Varesano ◽  
Fabio Rombaldoni ◽  
Cinzia Tonetti
Keyword(s):  
Oleic Acid ◽  
Cotton Fabrics ◽  
Electrically Conductive ◽  
Acid Coating
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