The commonly used dispersants in tungsten oxide dispersions are as follows:
- Ionic surfactants: such as anionic surfactants (such as sodium lauryl sulfate), cationic surfactants (such as cetyltrimethylammonium bromide) and nonionic surfactants (such as polyoxyethylene stearate), etc. Ionic surfactants have good dispersibility and stability, and can adjust the surface tension of the solution and the interaction between particles.
- Polymer dispersant: Polymer dispersant can provide high dispersion and stability. Commonly used polymers include polyvinyl alcohol (PVA), sodium polyacrylate (PAA), polyvinylpyrrolidone (PVP), etc. These polymers can prevent particle agglomeration and deposition by interacting with the surface of tungsten oxide particles.
- Surface modifier: The surface modifier is a compound that can chemically react with the surface of tungsten oxide particles, which can change the surface properties of the particles and improve the dispersion and stability. Commonly used surface modifiers include silane coupling agents, carboxylic acids, amines, and the like.
- Colloidal protective agent: The colloidal protective agent can protect the particles by forming a stable micelle structure or adsorbing on the surface of the particles, preventing particle agglomeration and deposition. Common colloidal protective agents include gelatin, hydroxypropylmethylcellulose (HPMC), hydroxyethylcellulose (HEC), and the like.
The selection of a suitable dispersant needs to consider factors such as the surface properties of the particles, solution conditions, and application requirements. Different dispersants may have different effects in different systems, so it is necessary to conduct experiments and optimize selection according to specific conditions.
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