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.

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.

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.

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.

Study on the Enzyme Desizing Process for Cotton Fabric Using Ultrasonication

2011 ◽  
Vol 331 ◽  
pp. 261-264 ◽  
Author(s):  
Qi Ming Zhao ◽  
Shan Yan Zhang
Keyword(s):  
Cotton Fabric ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Research Result ◽  
Strength Loss ◽  
Cotton Fabrics ◽  
Optimum Process ◽  
Process Conditions ◽  
Fabric Strength ◽  
Enzyme Dosage

The auxiliary devices of ultrasonic treatment was designed and manufactured. The cotton fabric was desized using 2000L desizing enzyme with the conventional enzyme desizing process and ultrasonic enzyme desizing process respectively. Through the orthogonal experiment, the optimum process conditions of conventional enzyme desizing process and ultrasonic enzyme desizing process were determined. For the conventional enzyme desizing process, the optimized desizing conditions of cotton fabrics were: desizing enzyme dosage was 1.5g/l, temperature was 80°C, PH value was 6, and time was 60mins. The optimum process conditions of ultrasonic enzyme desizing process were: desizing enzyme dosage was 1.5g/l, temperature was 50°C, PH value was 6 and time was 45minutes. The research result indicates that, under the same desizing condition, ultrasonication can improve the desizing percentage and whiteness of cotton fabric, but the fabric strength loss increases slightly. And for the same required desizing percentage, the ultrasonic enzyme desizing process saved time and reduced the temperature of experiments compared with traditional enzyme desizing process

scholarly journals Study on Aqueous Enzymatic Extraction Process of Common Pistache Oil

2021 ◽  
Vol 251 ◽  
pp. 02058
Author(s):  
Feng Xuehua ◽  
Tao Ali ◽  
Song Zurong ◽  
Gong Panpan
Keyword(s):  
Ph Value ◽  
Orthogonal Experiment ◽  
Extraction Process ◽  
Optimal Time ◽  
Process Conditions ◽  
Optimal Process ◽  
Enzymatic Extraction ◽  
Hydrolysis Time ◽  
Aqueous Enzymatic Extraction ◽  
The Common

The aqueous enzymatic method was applied to extract the common pistache oil and the optimal extraction process conditions were identified. By observing the effect of enzymatic hydrolysis time, pH value, temperature on aqueous enzymatic extraction process and performing the orthogonal experiment based on the single factor test, the optimal process parameters were obtained, namely, the optimal time, temperature, and pH value were respectively 3 h, 50℃, and 7 with a final extraction rate of 25.38 %.

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.

scholarly journals MAGNETIC NANOPARTICLES IN BIOCATALYSIS

2021 ◽  
pp. 66-72
Author(s):  
Александрина Михайловна Сульман ◽  
Ольга Валентиновна Гребенникова ◽  
Анастасия Евгеньевна Филатова
Keyword(s):  
Magnetic Nanoparticles ◽  
Horseradish Peroxidase ◽  
Kinetic Parameters ◽  
Magnetic Particles ◽  
Ph Value ◽  
Co Precipitation ◽  
Optimal Ph

В работе изучены свойства ферментативных систем на основе иммобилизованной на магнитные частицы пероксидазы корня хрена (HRP). Магнитные наночастицы FeO были синтезированы методом соосаждения. Затем на их поверхность двумя способами была иммобилизована пероксидаза корня хрена путем ковалентной сшивки. Для этого, в первом случае, FeO последовательно обрабатывали тетраэтоксисиланом, 3-аминопропилтриэтоксисиланом, глутаровым диальдегидом и HRP. Во втором, перед иммобилизацией HRP на поверхность носителя были последовательно нанесены 3-аминопропилтриэтоксисилан, глутаровым диальдегидом и HRP. Активность синтезированных биокатализаторов оценивалась спектрофотометрически в реакции окисления 2,2'-азино-бис(3-этилбензотиазолин-6-сульфонат) аммония пероксидом водорода. В работе также были рассчитаны кинетические параметры K и V для всех типов катализаторов, в том числе для нативной HRP. Среди всех биокаталитических систем лучшие значения, по сравнению с нативным ферментом (K = 4 ммоль/л и V = 12.6∙10, ммоль/л∙с) , были получены для первого типа биокатализатора (K = 5 ммоль/л и V = 2.5∙10, ммоль/л∙с). Было также определено, что оптимальным значением рН является 7.2. The synthesis of biocatalytic systems based on horseradish peroxidase immobilized on magnetic particles was investigated. The method of co-precipitation was used to obtain magnetic nanoparticles. Two types of magnetic particles were studied: untreated and pretreated with tetraethoxysilane. The basic kinetic parameters KM and Vm were calculated for all types of biocatalysts. The optimal pH value was determined for the biocatalyst that showed the greatest activity during oxidation

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.

Study on Preparation Technology Optimization of Sultamicillin Tosilate-β-Cyclodextrin

2015 ◽  
Vol 1120-1121 ◽  
pp. 873-876
Author(s):  
Xiang Qun Xu ◽  
Nian Hong ◽  
Jie Yang ◽  
You Quan Zhong ◽  
Lin Cheng
Keyword(s):  
Orthogonal Experiment ◽  
Process Condition ◽  
Molar Ratio ◽  
Process Conditions ◽  
Preparation Technology ◽  
Inclusion Process ◽  
Cyclodextrin Inclusion ◽  
Main Factors ◽  
Time Of Reaction

To study the process conditions for preparing sultamicillin tosilate β-cyclodextrin inclusion.Method: Choose the usage ration of sultamicillin tosilate with β-cyclodextrin, the inclusion temperature and the time of reaction as the main factors, and use the inclusion yield as evaluated indicators and the process condition to conduct the L9 (34) orthogonal experiment Optimization Pack sultamicillin tosilate.Outcome: The optimum inclusion process condition: molar ratio of the sultamicillin tosilate with β-cyclodextrin is 1:8, inclusion temperature is 47°C, inclusion time is 40 minutes.Conclusion: The process condition of using β-cyclodextrin inclusion to inconcluse sultamicillin tosilate is feasible, effective, and of applicative value.

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