Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Improved ferroferric oxide magnetic fluid and method for preparing same

A ferroferromagnetic and ferroferric oxide technology, which is applied in the fields of magnetic liquid, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of large particle size, limited application, impure products, etc., and achieve particle size Small diameter, wide application, and uniform particle size

Inactive Publication Date: 2010-06-30
SHANGHAI UNIV
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-magnetic fluids of different sizes have been prepared, but the prepared magnetic particles have problems such as harsh reaction conditions, large particle size, easy agglomeration, and impure products, which limit their application in the field of biomedicine

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Dissolve 0.8mol / L ferric salt and 0.4mol / L ferrous salt in 45mL deionized water, the ferric salt is FeCl 3 ·6H 2 O, the ferrous salt is FeSO 4 ·7H 2 O, after being transferred into a three-necked flask, vacuumize and fill with nitrogen, add 25% to 28% (mass percentage) ammonia water to adjust the pH of the system to 9, stir and react at 100°C for 1h, wash with ethanol and deionized water to remove excess unreacted iron salt ions.

[0014] Divide the ferroferric oxide obtained by the reaction into two parts, the first part is dispersed in 200mL, 3mol / L trisodium citrate solution for 1h, and washed with ethanol and deionized water for several times until the pH is neutral, and the surface potential ferrofluid for -19.0mV. The second part was dispersed in 200 mL, 6 mol / L nitric acid solution for 1 h, and washed with ethanol and deionized water for several times until the pH was neutral to obtain a magnetic fluid with a surface potential of +18.5 mV. The part...

Embodiment 2

[0015] Example 2: Dissolve 1.4mol / L ferric salt and 0.7mol / L ferrous salt in 60mL deionized water, the ferric salt is FeCl 3 ·6H 2 O, the ferrous salt is FeSO 4 ·7H 2 O, after being transferred into a three-necked flask, vacuumize and fill with nitrogen, add 25% to 28% (mass percentage) ammonia water to adjust the pH of the system to 9, stir and react at 90°C for 1h, wash with ethanol and deionized water to remove excess unreacted iron salt ions.

[0016] The ferric ferric oxide obtained by the reaction is divided into two parts, the first part is dispersed in 150mL, 2.5mol / L trisodium citrate solution for 1.5h, and washed with ethanol and deionized water for several times until the pH is neutral to obtain A ferrofluid with a surface potential of -15.6mV. After the second part was dispersed in 150 mL, 3.5 mol / L nitric acid solution for 1.5 h, it was washed with ethanol and deionized water several times until the pH was neutral, and a magnetic fluid with a surface potential ...

Embodiment 3

[0017] Example 3: Dissolve 2.6mol / L ferric salt and 1.3mol / L ferrous salt in 25mL deionized water, the ferric salt is FeCl 3 ·6H 2 O, the ferrous salt is FeSO 4 ·7H 2 O, after transferring into a three-necked flask, vacuumize and fill with nitrogen, add 25% to 28% (mass percentage) ammonia water to adjust the pH of the system to 9, stir and react at 95°C for 1.5h, wash with ethanol and deionized water to remove excess unreacted iron salt ions .

[0018] Divide the ferroferric oxide obtained by the reaction into two parts, the first part is dispersed in 300mL, 2mol / L trisodium citrate solution for 2h, and washed with ethanol and deionized water for several times until the pH is neutral, and the surface potential for -23.9mV ferrofluid. The second part was dispersed in 300mL, 4mol / L nitric acid solution for 2h, washed with ethanol and deionized water several times until the pH was neutral, and a magnetic fluid with a surface potential of +17.1mV was obtained. The particle s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The ferroferric oxide nano magnetic fluid prepared with the method has the particle size of 8-17 nm. The ferroferric oxide particles modified by trisodium citrate have negative electricity on the surfaces, and the Zeta potential measurement shows that the potential on the surfaces of the ferroferric oxide particles is -8.6 mV to -23.9 mV. The ferroferric oxide particles modified by nitric acid have positive electricity on the surface, and the Zeta potential measurement shows that the potential on the surfaces of the ferroferric oxide particles is +6.7 mV to +18.5 mV. Compared with the prior art, because the invention adopts lower synthesis temperature, and the nitrogen protection prevent the oxidation of divalent iron salt, the prepared magnetic particles have small and even size and electricity on surfaces, can disperse stably for a long time without agglomerating and are super paramagnetic particles which can move directionally under the condition that the magnetic field exists. The method for preparing the improved ferroferric oxide magnetic fluid comprises the following steps: adjusting the pH value of solution containing trivalent iron salt and bivalent iron salt solution to 9-10 with aqueous ammonia under the nitrogen protection, stirring the aqueous ammonia to the solution to make the aqueous ammonia react with the solution at 70-100 DEG C for 1-4h, washing the product of reaction with ethanol and deionized water repeatedly until the pH value of the product of reaction being neutral, dispersing the prepared nano magnetic ferroferric oxide in the trisodium citrate solution or the nitric acid solution, and washing the product of reaction with acetone and deionized water repeatedly to obtain the ferroferric oxide nano magnetic fluid with negative electricity or positive electricity.

Description

technical field [0001] The invention relates to two methods of modifying iron oxide nanometer magnetic fluid and its preparation method. Background technique [0002] In recent years, ferroferric oxide nanomaterials have become a hotspot in the research of magnetic nanomaterials because of their controllable size and shape and the wide application of their composites in many fields. Because of a series of unique properties such as superparamagnetism, high coercive force, low Curie temperature, and broadband strong absorption, it has been widely used in stealth absorbing materials, magnetic recording materials, and magnetic refrigeration materials. With the deepening of research and cross-infiltration between disciplines, the preparation and research of multifunctional magnetic composite microspheres that can be used in biomedicine and separation engineering related fields such as drug release and biomacromolecule separation have become a hot spot. The surface properties and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01F1/44H01F41/00
Inventor 颜世峰张瑛朱捷范寅清郑嬿珍尹静波
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com