Due to the small size effect, surface effect, quantum size effect and macroscopic quantum tunneling effect of nanoparticles, they are different from conventional particles in terms of heat, light, magnetism, sensitivity and surface stability. How to evenly disperse nanoparticles into the matrix is ​​a key technology in nanotechnology. The use of ultrasonic ultrasonic cavitation to disperse agglomerated particles is currently the most effective physical dispersion method. It is to place the desired particle suspension (liquid) into a super-strong sound field and treat it with appropriate ultrasonic amplitude and duration of action. The FS series of ultrasonic processors are often used to disperse nano-materials, and the effect is remarkable. It has become an essential instrument for material chemists at home and abroad.
Material dispersion Medium selection:
Most inorganic salts, oxides, silicate particles and inorganic powders are easily dispersed in organic polar liquids. Most non-polar particles are easily dispersed in non-polar liquids. The sedimentation medium generally selected for powder testing should have a wetting effect on the powder, and at the same time take into account the low cost.
Non-toxic, non-corrosive. In order to reduce the sedimentation rate of the powder particles, a method of adding a tackifier may also be employed. The sedimentation media commonly used are:
Water, water + glycerin, ethanol, ethanol + water, ethanol + glycerol, cycloethanol and the like. When the powder is coarse, water or water plus glycerin sedimentation medium may be used.
The role of the dispersant:
Due to the inherent characteristics of powder particle agglomeration, for some powders which are not well dispersed in the medium, an appropriate amount of dispersing agent may be added to maintain a dispersed stable state. Commonly used dispersing agents are: sodium hexametaphosphate, sodium pyrophosphate, ammonia, etc., and the concentration is generally 0.1--0.2%.
Ultrasonic dispersion time control:
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