Study on the Preparation of Fe3O4 Nano-Magnetic Fluid for Seal

2010 ◽  
Vol 139-141 ◽  
pp. 34-38
Author(s):  
Bing Chen ◽  
Yu Guang Fan
Keyword(s):  
Saturation Magnetization ◽  
Sodium Oleate ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Heating Temperature ◽  
Nano Particles ◽  
Orthogonal Experimental Design ◽  
Optimum Process ◽  
Factors Affecting ◽  
Naoh Solution

Water-based Fe3O4 nano-magnetic fluid for seal was prepared by coprecipitation. In order to obtain nano-magnetic fluid preparation technology which can produce industrially, the choice of second coating surfactant has been studied. Factors affecting nano-particle size and particle saturation magnetization were investigated using five factors and three level orthogonal experimental design. The size of nano-particles and particle saturation magnetization were characterized by transmission electron microscopy (TEM) and WSM vibration magnetometer. The results showed that the adding speed of NaOH solution and heat-maintaining time after adding, adding speed and reaction temperature of sodium oleate solution, as well as the heating temperature of sodium oleate solution influence the properties of nano-magnetic particles more. With the optimum process parameters, Fe3O4 nano-magnetic fluid which is below 15nm and can meet the nano-magnetic fluid sealing technology requirements has been prepared.

Study on Preparation of Oil-Based Fe3O4 Nano Magnetic Fluid

2010 ◽  
Vol 148-149 ◽  
pp. 808-811
Author(s):  
Bing Chen ◽  
Yu Guang Fan ◽  
San Pin Zhou
Keyword(s):  
Saturation Magnetization ◽  
Magnetic Fluid ◽  
Heating Temperature ◽  
Orthogonal Design ◽  
Nano Particles ◽  
Reaction Conditions ◽  
Mechanical Dispersion ◽  
Naoh Solution ◽  
Vibration Magnetometer ◽  
The Stability

Adopting chemical coprecipitation and mechanical dispersion to prepare oil based magnetic fluid is a good way to increase the stability of magnetic fluid. This paper uses orthogonal design to analyze the influences from different factors, and The size of nano-particles and saturation magnetization were characterized by TEM and WSM vibration magnetometer. The results show that the NaOH solution adding speed of 0.4 ml/s and reaction temperature of 50 ~55 , sodium oleate solution adding speed of 0.3ml/s and heating temperature of 65 , heat-maintaining time of 20min are proper reaction conditions.

Effects of Process Conditions on Properties of Nano-Magnetic Fluid

2011 ◽  
Vol 194-196 ◽  
pp. 700-703
Author(s):  
Bing Chen ◽  
Yu Guang Fan
Keyword(s):  
Saturation Magnetization ◽  
Sodium Oleate ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Process Condition ◽  
Nano Particles ◽  
Process Conditions ◽  
Co Precipitation

In order to analyze the influences of process condition on kerosene-based Fe3O4, which are prepared in chemical co-precipitation, orthogonal experiment was used. How process condition influenced the size of nano-particles and saturation magnetization was studied, and the best process condition as 40ml•min-1 NaOH adding speed, 10ml•min-1 sodium oleate adding speed, 45°C reaction temperature, 15min holding time and pH value of 2 of coating sodium oleate was obtained. The performance of magnetic particles was characterized by transmission electron microscopy (TEM) and WSM vibration magnetometer. The diameter of Fe3O4 nano-particles was less than 10nm, saturation magnetization was 2.66×104A•m-1, viscosity of nano-magnetic fluid was 18mPa•s, and density was 1.13×103kg•m-3. This research enhanced the foundation of using nano-magnetic fluid.

Effect of Different pH on Characterization of Oil-Based Magnetic Fluid

2014 ◽  
Vol 574 ◽  
pp. 338-341
Author(s):  
Zi Fen Zhao ◽  
Hui Ping Shao ◽  
Sen Sun
Keyword(s):  
Saturation Magnetization ◽  
Sodium Oleate ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Precipitation Method ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Co Precipitation

In this paper, the oil-based magnetic fluid was prepared by chemical co-precipitation method and sodium oleate was the surfactant. The effect of different pH on the characterization of magnetic fluid was studied. The characterization was detected by Fourier Transform Infrared spectroscopy (FT-IR), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). The results show that the nanoparticles were coated successfully by sodium oleate at pH=5. And the saturation magnetization of Fe3O4 magnetic nanoparticles is 58.0 emu/g, the saturation magnetization of magnetic fluid prepared is 20.2 emu/g, and the Fe3O4 particles are dispersed well. Although the Fe3O4 magnetic particles coated by sodium oleate at pH = 10.5 has a higher saturation magnetization (67.8 emu/g), but the magnetic fluid is less stable and has an obvious settlement phenomenon.

Study on γ-Fe2O3 Magnetic Fluid by Thermal Oxidizing of Fe3O4 Nanoparticles

2015 ◽  
Vol 713-715 ◽  
pp. 2916-2919
Author(s):  
Hang Zheng ◽  
Hui Ping Shao ◽  
Zi Fen Zhao
Keyword(s):  
Surface Modification ◽  
Oleic Acid ◽  
Magnetic Nanoparticles ◽  
Saturation Magnetization ◽  
Sodium Oleate ◽  
Magnetic Fluid ◽  
Silicone Oil ◽  
Precipitation Method ◽  
Carrier Liquid ◽  
Co Precipitation

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.

Synthesis of Diester Based Magnetic Fluid

2012 ◽  
Vol 217-219 ◽  
pp. 721-724 ◽  
Author(s):  
Hai Rong Cui ◽  
Xue Feng Wang
Keyword(s):  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Research Field ◽  
Nano Particles ◽  
Molar Ratio ◽  
Engineering Research ◽  
Carrier Liquid ◽  
Proper Size ◽  
Environment Temperature ◽  
Magnetic Nano Particles

Diester based magnetic fluid is a novel intelligent material which use diester as carrier liquid and magnetic iron ore as magnetic nano-particles combined together with proper surfactant. Its specially unique characteristic contributes to wide applications in engineering research field such as magnetic fluid based seals, magnetic fluid based dampers and so on. This paper provides a method of diester-based magnetic fluid synthesis and analysis for the properties of prepared diester magnetic fluid as well as effective influencing parameters. The results show that for getting proper size and magnetization of magnetic particles, the proper reacted temperature is around 60~80°C, appropriate molar ratio of reacted solution is 1.75 and concentration of forerunner is about 0.6 mol/L. It is also found that the viscosity of diester-based magnetic fluid is decreased with environment temperature while the viscosity as well as saturation magnetization increases with the increment of density.

Kerosene Based Magnetic Fluid Used in Magnetic Fluid Inclination Sensor

2011 ◽  
Vol 211-212 ◽  
pp. 411-415 ◽  
Author(s):  
Hai Rong Cui ◽  
Ming Li Sun ◽  
Xue Feng Wang
Keyword(s):  
Saturation Magnetization ◽  
Ferric Chloride ◽  
Magnetic Fluid ◽  
Ph Value ◽  
Physical Property ◽  
Nano Particles ◽  
Molar Ratio ◽  
Iron Ion ◽  
Ferrous Chloride ◽  
Magnetic Nano Particles

Kerosene based magnetic fluid which use kerosene as carrier liquid is characterized by better liquidity and higher magnetization which is qualified enough to use in magnetic fluid based inclination sensor. This paper provides several preparative parameters to control the physical property of kerosene based magnetic fluid during manufacture processing which use ferrous chloride and ferric chloride as forerunner reaction mass. The results show that the proper consistency of ferrous chloride and ferric chloride is 0.6mol/L. Secondly, the saturation magnetization of magnetic nano-particles is highest when the molar ratio between trivalent iron ion and bivalent iron ion is equal to 1.75. Thirdly, the proper reacted temperature is between 60~80°C and pH value should be controlled in a weak alkaline situation while six hours should be necessary for surfactant encapsulated enough around the magnetic nano-particles surface. At last, the saturation magnetization of kerosene based magnetic fluid increases with the increment of density and viscosity of magnetic fluid.

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

The Analysis on the Starting Friction Torque Increase of Magnetic Fluid Revolving Sealing

2013 ◽  
Vol 275-277 ◽  
pp. 429-432 ◽  
Author(s):  
Yu Qiang Cai ◽  
Na Xing
Keyword(s):  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Influence Factor ◽  
Magnetic Field Gradient ◽  
Friction Torque ◽  
Key Factor ◽  
Lower Temperature ◽  
Change Of Microstructure ◽  
Starting Torque ◽  
Main Influence

Abstract. Magnetic fluid revolving sealing is widely used in modern industry. In the process of application, it is founded that the starting friction torque is very large, particularly at lower temperature. This problem has become a key factor restricting the application of magnetic fluid rotation sealing. In this paper, the mechanism of starting torque increase is analyzed, based on the change of microstructure and its viscosity. After analysis , such conclusion is obtained , which can be described: to a certain sealing structure, the type of magnetic fluid, size distribution of magnetic particles as well as the working condition concluding temperature, magnetic field gradient and the revolving velocity of shaft is the main influence factor of starting friction torque . It is very useful to reduce the starting friction torque.

Theory Analysis for Magnetic Fluid Inclination Sensor

2010 ◽  
Vol 168-170 ◽  
pp. 1295-1298
Author(s):  
Ming Li Sun ◽  
Hai Rong Cui ◽  
Bin Wang ◽  
Shuang Lu
Keyword(s):  
Magnetic Fluid ◽  
Linear Dependence ◽  
Output Voltage ◽  
Vertical Plane ◽  
Signal Frequency ◽  
Theory Analysis ◽  
Peak Voltage ◽  
Factors Affecting ◽  
Sensor Sensitivity ◽  
Inclination Angles

The paper presents an inclination transducer with magnetic fluid, being dedicated to measure little inclination angles in comparison with a horizontal or a vertical plane. The functioning principle is submitted. The results of theory analysis show that output voltage of sensor and inclination angles are linear dependence. The factors affecting the sensor sensitivity are inspected, which include the exciting signal frequency, the peak voltage and the susceptibility of magnetic fluid.

Study on Hydrophilic Modification of Acrylic Yarn

2014 ◽  
Vol 1061-1062 ◽  
pp. 287-290
Author(s):  
Yin Wang ◽  
Zheng Qin Liu ◽  
Kai Qiang Liu ◽  
Cui Ping Zhang ◽  
Qiu Mei Wang
Keyword(s):  
Moisture Absorption ◽  
Cyano Group ◽  
Fiber Surface ◽  
Cross Linking ◽  
Optimum Process ◽  
Hydrolysis Time ◽  
Experimental Conditions ◽  
Hydrophilic Modification ◽  
Orthogonal Experiments ◽  
Naoh Solution

In order to improve the moisture absorption of the acrylic yarn, the acrylic yarn was firstly hydrolyzed in the caustic soda (NaOH) solution to convert the cyano group molecular into hydrophilic group, then the reticulated coatings was formed on fiber surface by chemical crosslink. Furthermore, the effect of the acrylic hydrolysis temperature, NaOH dosage, ethanol, cross-linking agent (CLA) on acrylic affinity for moisture was discussed through the contrast experiments. The best experimental conditions were investigated by the orthogonal experiments, and the optimum process parameters were obtained. The results indicate that under the condition of NaOH concentration of 6%, hydrolysis time of 15 min, temperature of 80°C, and cross-linking agent concentration of 0.09% on weight the yarn (owf), the moisture regain of modified acrylic yarn has increased by 245.4% as compared with that of untreated acrylic yarn and the water absorption has been improved greatly.

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