Hydrothermal Treatment of Nano-Magnesium Hydroxide in the Presence of Ionic Surfactants

This paper reviews the research on hydrothermal treatment of nano magnesium hydroxide in the presence of nonionic surfactants. Through the hydrothermal method, nano magnesium hydroxide with high dispersibility and specific morphology can be prepared under the action of specific nonionic surfactants. This study explores the mechanism of action of nonionic surfactants and their effects on product morphology, size and dispersibility.

Nano magnesium hydroxide is widely used in many fields due to its excellent performance. Hydrothermal treatment is a commonly used method for synthesizing nanomaterials, which can adjust the morphology and size of the product by precisely controlling the reaction conditions. Nonionic surfactants play an important role in hydrothermal synthesis due to their mild surface activity and good compatibility.

2. Experimental part

Raw materials: magnesium hydroxide precursor, nonionic surfactant (such as polyethylene glycol PEG, sodium dodecyl sulfate SDS, etc.).

Instruments: autoclave, constant temperature water bath, centrifuge, scanning electron microscope SEM, X-ray diffractometer XRD, etc.

Experimental steps:

Add magnesium hydroxide precursor and nonionic surfactant to the autoclave, and add appropriate amount of water.

The autoclave was sealed and placed in a constant temperature water bath, and heated at a set temperature for a certain time.

After the reaction was completed, the product was separated by centrifugation and washed several times with deionized water.

Finally, the product was dried in a vacuum drying oven.

3. Results and Discussion

Morphology control: The morphology and size of nano magnesium hydroxide can be effectively controlled by adjusting the type and concentration of non-ionic surfactants.

Dispersibility: The presence of non-ionic surfactants helps to improve the dispersibility of nano magnesium hydroxide and avoid particle agglomeration.

Mechanism of action of surfactants: Non-ionic surfactants act as templates in hydrothermal reactions, and affect the growth direction and speed of crystals by interacting with magnesium hydroxide precursors.

Hydrothermal treatment in the presence of non-ionic surfactants can effectively prepare nano magnesium hydroxide with controllable morphology and good dispersibility. The quality of the product can be further improved by selecting appropriate surfactants and optimizing reaction conditions. This preparation method lays the foundation for the large-scale production and application of nano magnesium hydroxide.