Pipette Uses Viscoelastic Properties of Polymer Materials to Work

In order to reduce the noise generated by the vibration of the vehicle during driving and improve the comfort and heat preservation of the vehicle, after the primer is sprayed, it is generally applied to the inner surface of the door panel, the roof, the sidewall, and the hood and the upper surface of the floor. Finish the sound insulation damping paint.

According to the needs of the user object and the use environment, damping coatings often have certain functions of damping, heat insulation, and sound insulation. The basic principle of the pipette is to use the viscoelastic energy of the polymer material to absorb part of the vibration energy of the vibration source and then release it in the form of “heat”, that is, the so-called mechanical loss occurs to achieve the suppression of vibration and reduce noise. purpose.

Standard 8 & 12 Channel Adjustable Pipettes

1. High precision rinse

In addition to ordinary liquid rinsing, when absorbing organic solvents or highly volatile liquids, volatile gases will form negative pressure in the white sleeve chamber, resulting in liquid leakage. At this time, pre-washing is required 4-6 times to allow When the gas in the white sleeve room reaches saturation, the negative pressure will disappear automatically.

Note: Please do not rinse off liquids with high or low temperature (below the freezing point)! Consider pipettes with external pistons.

2. Pipetting with a pipette

1) The angle of pipetting and immersion: Keep it vertical, and at most, it cannot exceed 20°. Tilt aspiration will change the air pressure and increase the pipetting error.
2) Tip immersion depth: (as shown in the figure below) The correct tip immersion depth can effectively reduce the error of liquid extraction. Troublesome liquid high viscous liquid pipette.
3) Liquid suction speed: uniform speed. Too fast aspiration speed will easily cause the sample to form a vortex and generate bubbles; the sample liquid will easily enter the sleeve and cause damage to the piston and sealing ring; bring in aerosol and cause cross-contamination of the sample; especially for liquids above 1ml, it is easy to cause the liquid to wash up. After inhalation can stay on the liquid surface for 1-3 seconds.
4) Draining and blowing:
Draining: Press the piston to the position to drain;
Blowing liquid: Continue to press the piston button until it reaches the second stop point or passes through the second stop point to the bottom.
5) The pipette must be removed from the tip before it can be placed flat on the bench because any remaining liquid will flow back to the pipette rod when it is flat. (I have to admit that I often overlook this when doing experiments…)

3. Maintenance of pipette

The service life of an object, in general, 6 points depends on the correct use method, 4 points depends on the correct maintenance.
1) If the pipette needs to be used every day, it is recommended to clean and calibrate it every three months or six months.
2) If you don’t use it for a long time, you should adjust the range of the pipette to the scale of the value. Not paying attention to this point will easily cause the piston to fail to rebound.
3) If the liquid enters the piston chamber accidentally, the contaminants must be removed in time.
4) Before high-temperature disinfection, make sure that the pipette can adapt to high temperature, and avoid deformation in a high-temperature place, which may cause leakage or inaccuracy.
The above is all the sharing about the work of the pipette using the viscoelasticity of the polymer material.