Introduction to Sample Pretreatment Methods---Ultrasonic Crushing
Ultrasonic wave is a kind of sound wave with a frequency higher than 20,000 Hz. It has good directionality, strong penetrating ability, easy to obtain concentrated sound energy, and has a long distance in water. It can be used for distance measurement, speed measurement, cleaning, welding, crushing stone. , sterilization and so on. There are many applications in medicine, military, industry, and agriculture.
Ultrasonic effect: When ultrasonic waves propagate through a medium, physical and chemical changes occur in the medium due to the interaction of the ultrasonic waves with the medium, resulting in a series of ultrasonic effects:
1 mechanical effect. The mechanical action of the ultrasonic waves can contribute to the emulsification of the liquid, the liquefaction of the gel, and the dispersion of the solid.
2 cavitation. When ultrasonic waves act on a liquid, a large number of small bubbles are generated, which collide at a negative electric current to generate a large amount of energy.
3 thermal effects. Due to the high frequency of the ultrasonic wave and the high energy, it can produce significant thermal effects when absorbed by the medium.
4 chemical effects. The action of ultrasound can cause certain chemical reactions to occur or accelerate.
Ultrasonic application:
1. Ultrasonic extraction of bio-nano: In the ultrasonic extraction of nano-materials, the key role is the cavitation effect of ultrasonic waves. Graphene is widely used nowadays.
2, ultrasonic pharmaceutical 1) Dispersion of pharmaceutical substances for injection 2) Herbal extraction 3) Preparation of suspension 4) Preparation of vaccine
3. Ultrasonic Dispersion of Cosmetics: The use of ultrasonic waves can further extract the essence of the drug and the micronization of the particles, and save production costs, achieve dispersion and emulsification effects, and make the cosmetics penetrate deep into the inner layer of the skin to exert the efficacy and effect of the drug.
4. Ultrasonic alcoholization of alcohol: The main controlling factor of wine is the chemical change, ie the formation of acid, and further esterification. The ester is involved in the association of ethanol and water. Ultrasonic treatment with a power of 1.6KW and a frequency of 17.5~22KHZ for 5~10min can shorten the ripening time of wine by 1/3 to 1/2.
Shanghai Shujun Instrument Equipment Co., Ltd. is the exclusive agent for the US SONICS ultrasonic breaker VCX150/VCX800/VCX1600HV.
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