Effect of Oleic Acid Surface Modification on Dispersion Stability and Breakdown Strength of Vegetable Oil-Based Fe3O4Nanofluids

In this paper, Fe3O4magnetic nanoparticles were synthesized by chemical co-precipitation method and their surface was modified by sodium oleate. The γ-Fe2O3magnetic nanoparticles were achieved by thermal oxidizing of Fe3O4. The γ-Fe2O3magnetic fluid was prepared by using silicone oil as carrier liquid and oleic acid as surface modification agent, and the saturation magnetization of prepared γ-Fe2O3magnetic fluid hits 14.25emu/g.

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Fabrication and characterization of polyimide/Al2O3 composite films via surface modification and ion exchange technique

Pigment & Resin Technology ◽

10.1108/prt-01-2015-0009 ◽

2016 ◽

Vol 45 (1) ◽

pp. 30-37 ◽

Cited By ~ 3

Author(s):

M.Y. Zhang ◽

L.Z. Liu ◽

L. Weng ◽

W.W. Cui ◽

K.S. Hui

Keyword(s):

Surface Modification ◽

Ion Exchange ◽

Breakdown Strength ◽

Composite Films ◽

Annealing Treatment ◽

Ambient Air ◽

Ammonia Solution ◽

Excellent Thermal Stability ◽

Content Type ◽

General Importance

Purpose – The aim of this study was to fabricate polyimide (PI)/Al2O3 composite films via surface modification and ion exchange techniques, and examine their properties. Design/methodology/approach – The method involves hydrolyzing the PI film double surface layers in an aqueous potassium hydroxide (KOH) solution and incorporating aluminium ions (Al3+) into the hydrolyzed layers of the PI film via subsequent ion exchange, followed by a treatment of the Al3+-loaded PI films with an aqueous ammonia solution, which leads to the formation of Al(OH)3 in the surface-modified layers. After a final thermal annealing treatment in ambient air, the Al(OH)3 decomposes to Al2O3, and forms composite layers on both surfaces of the re-imidized PI film. Findings – The PI/Al2O3 composite film obtained with a 6 hours of KOH treatment exhibited excellent thermal stability, good mechanical properties and better electric breakdown strength and corona-resistance properties than the pristine PI film. Practical implications – The method for obtaining the composite films in this paper is worth consideration, but additional research will be needed. Furthermore, this method is of general importance for the fabrication of composite PI films with tailored properties. Originality/value – This study showed that surface modification and ion-exchange techniques are powerful methodologies for the fabrication of PI/Al2O3 composite films.

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Surface modification of carbon black by vegetable oil?Its effect on the rheometric, hardness, abrasion, rebound resilience, tensile, tear, and adhesion properties

Journal of Applied Polymer Science ◽

10.1002/app.10320 ◽

2002 ◽

Vol 84 (2) ◽

pp. 256-260 ◽

Cited By ~ 16

Author(s):

P. P. Kundu ◽

T. R. Kukreja

Keyword(s):

Surface Modification ◽

Carbon Black ◽

Vegetable Oil ◽

Adhesion Properties

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Surface-modification of SiO2 nanoparticles with oleic acid

Applied Surface Science ◽

10.1016/s0169-4332(03)00259-9 ◽

2003 ◽

Vol 211 (1-4) ◽

pp. 315-320 ◽

Cited By ~ 164

Author(s):

Zongwei Li ◽

Yongfa Zhu

Keyword(s):

Surface Modification ◽

Oleic Acid ◽

Sio2 Nanoparticles

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Surface Modification and Dispersion Stability Control of Nanoparticles in Non-Aqueous Solvents

Journal of the Japan Society of Colour Material ◽

10.4011/shikizai.89.163 ◽

2016 ◽

Vol 89 (5) ◽

pp. 163-167

Author(s):

Motoyuki IIJIMA

Keyword(s):

Surface Modification ◽

Stability Control ◽

Dispersion Stability

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Influence of Monodisperse Fe3O4Nanoparticle Size on Electrical Properties of Vegetable Oil-Based Nanofluids

Journal of Nanomaterials ◽

10.1155/2015/560352 ◽

2015 ◽

Vol 2015 ◽

pp. 1-9 ◽

Cited By ~ 8

Author(s):

Bin Du ◽

Jian Li ◽

Feipeng Wang ◽

Wei Yao ◽

Shuhan Yao

Keyword(s):

Vegetable Oil ◽

Breakdown Strength ◽

Electrical Breakdown ◽

Electrical Potential ◽

Volume Resistivity ◽

Dielectric Strength ◽

Potential Measurement ◽

Dielectric Characteristics ◽

Space Charge Distribution ◽

Electrical Breakdown Strength

Insulating oil modified by nanoparticles (often called nanofluids) has recently drawn considerable attention, especially concerning the improvement of electrical breakdown and thermal conductivity of the nanofluids. In this paper, three sized monodisperse Fe3O4nanoparticles were prepared and subsequently dispersed into insulating vegetable oil to achieve nanofluids. The dispersion stability of nanoparticles in nanofluids was examined by natural sedimentation and zeta potential measurement. The electrical breakdown strength, space charge distribution, and several dielectric characteristics, for example, permittivity, dielectric loss, and volume resistivity of these nanofluids, were comparatively investigated. Experimental results show that the monodisperse Fe3O4nanoparticles not only enhance the dielectric strength but also uniform the electric field of the nanofluids. The depth of electrical potential well of insulating vegetable oils and nanofluids were analyzed to clarify the influence of nanoparticles on electron trapping and on insulation improvement of the vegetable oil.

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