Method for using forced resonance torsional pendulum instrument for measuring liquid continuous frequency conversion viscoelasticity

Abstract

The invention provides a method for measuring liquid continuous frequency-changing viscoelasticity by using a forced resonance torsion pendulum instrument, which firstly measures resonance curves after unloading and loading liquid to be measured through the forced resonance torsion pendulum instrument, and the resonance curves include an angular displacement-frequency curve (Theta-Omega) and a phase-frequency curve (Phi-Omega), then the viscoelasticity of the corresponding liquid under the driving frequency (Omega) can be directly obtained through each pair of data points of the resonance curves, namely, the viscoelasticity (G1, G2 or Eta) of liquid can be calculated through the corresponding angular displacement (Theta) and phase (Phi) of each driving frequency (Omega). The invention provides a completely new method to overcome the defect that the existing forced resonance torsion pendulum instrument can only measure the liquid viscoelasticity under a specific frequency, and the new method realizes the continuous frequency-changing measurement of liquid viscoelasticity by the forced resonance torsion pendulum instrument in a real sense.

Description

technical field The invention belongs to the technical field of liquid viscoelasticity measurement, in particular to a method for measuring liquid continuous frequency conversion viscoelasticity based on a forced resonance gyrometer. technical background Soft matter is ubiquitous in daily life: liquid crystals, polymers, surfactants, biofilms, colloids, emulsions, foams, granular substances, and living systems are all examples of soft matter. The measurement and research of the viscoelasticity of soft matter can not only help people explore the profound substances in nature, but also help to promote the development of manufacturing, pharmaceutical and food industries, petroleum industry, agriculture and other fields, which have a very important relationship with people's lives . At present, the most popular measurement and research instruments for the viscoelasticity of soft matter mainly include commercial rheometers, torsion meters and microrheology, etc. The measuremen...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the forced resonance pendulum is that it can only measure the viscoelastic coefficient of one or several frequencies at a time.

How to realize the high-precision continuous frequency conversion measurement of liquid viscoelasticity with the pendulum instrument has always been a problem that scientists have paid attention to but has not yet been fully resolved.

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