Customized Magnetic Colloids

Customized Magnetic Colloids


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Alfa Chemistry utilizes extensive knowledge and technology in colloid chemistry to provide customers with customized services for magnetic colloids. We are able to prepare magnetic particles of different nanometer sizes and select the appropriate base fluid and surfactant according to the needs. Our products have the advantage of uniform particle sizes and strong stability.

Customized Magnetic Colloids


Magnetic colloid, also known as magnetic fluid, is a special functional material composed of magnetic solid particles (nano-scale), base liquid and surfactant. As a synthetic colloidal system, ferrofluid has both the magnetizability of a solid and the fluidity of a liquid, and exhibits superparamagnetic properties under the action of a magnetic field.[1] The application field of magnetic fluid involves aerospace, machinery, electronics, energy, chemical industry, metallurgy, medical treatment, etc. It is a high-tech material with a wide range of uses.

Customized Magnetic ColloidsFig.1 The composition of magnetic fluid[2]; Classification of magnetic fluids by the size of nanoparticles.[3]

Our Abilities

The table below shows our custom range of ferrofluids, which, combined with the many preparation methods we have, enables a broad product portfolio to be obtained in a very short period of time.If the product you need is not included in the table, please contact our technical staff for more product catalogues.

Magnetic particles:γ-Fe2O3, MeFe2O4 (Me=Co‚Mn‚Ni, etc.), Fe3O4, Ni, Co, Fe, FeCo and NiFe alloys, etc.
Base fluid:water, mineral oil, kerosene, organic compounds, esters and diesters, polyphenyl ethers, mercury, etc.
Surfactant:emulsifier OP-7, oleic acid, lauric acid, myristic acid, sodium dodecylbenzenesulfonate, sodium oleate, ethylene glycol, Tween-20 (T-20), nonylphenol Polyoxyethylene ether(Oπ-10), sodium gluconate, silane coupling agent KH560, polyethylene glycol, lignosulfonate, etc.

Our preparation methods include:

  • Mechanical grinding method
  • Chemical co-precipitation method
  • Thermal decomposition method
  • Plasma CVD method
  • Vacuum evaporation method
  • Organic phase dispersion method
  • Electrodeposition method
  • Gas phase liquid phase reaction method
  • Gas phase reduction method
  • Aqueous solution reduction method


After the successful preparation of the target colloid, we carry out a series of tests to ensure that the product meets your needs. Our testing items include but are not limited to the following types:

  • Magnetic particle phase analysis: X-ray diffraction (XRD)
  • Magnetic particle morphology analysis: Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM)
  • Hysteresis loop of ferrofluid
  • Anisotropy of Magnetic Fluids

In addition to the detection services described above, we are also able to study the particle size distribution of ferrofluids, as well as the size and shape of individual nanoparticles, using improved methods of dynamic light scattering and depolarized dynamic light scattering.

Customized Magnetic ColloidsFig 2. Laser correlation spectrometer. 1—laser radiation source; 2—aspherical focusing lens; 3—input polarizer; 4—cuvette with the fluid studied; 5—output diaphragms; 6—output rotating polarizer; 7—focusing lens; 8—optical fiber; 9—photomultiplier; 10— analog-to-digital converter; 11—computer.[4]


  1. Hui Shen, et al. Magnetic fluid and its preparation method. China Academic Conference on Functional Materials and Their Applications. 1998.
  2. Hao R, et al. Preparation and Parameters Measurement of Magnetic Fluid. Journal of Physics: Conference Series. 2020.
  3. Novopashin S A, et al. Methods of magnetic fluid synthesis (review). 2015, 22(4):397-412.
  4. Velichko E N, et al. Characterization of Magnetite–Silica Magnetic Fluids by Laser Scattering. Applied Sciences. 2020, 11(1):183.

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