Adhesive force measurement method and device

Abstract

The invention relates to an adhesive force measurement method and device. Two high-elasticity steel wires are selected; one end of one steel wire is fixed on a piezoelectric micro-cantilever sensor; a micro particle is adhered at each of the close ends of the two steel wires; liquid is dropped on the contact point of the two micro particles; the piezoelectric micro-cantilever sensor is bent by a millivolt generator to drive the connected steel wires and the micro particles adhered on the steel wires to move at a constant speed; the two micro particles are separated gradually, and a liquid bridge is formed by the liquid between the micro particles; voltage output by bending of the piezoelectric micro-cantilever sensor is acquired and recorded by an oscilloscope, so that tension, namely micro adhesive force can be measured. The device is reasonable in constituent and structure, easy and convenient to operate and accurate in measurement, so that measurement of the micro adhesive force between the two micro particles can be really realized under the action of the liquid ridge, and verification can be provided for theoretical analysis of the adhesive force. The method and the device can be used for analyzing the adhesive force, and a data support and quantitative analysis are provided for enhanced agglomeration of PM2.5 or deagglomeration of nano particles.

Description

technical field [0001] The invention belongs to the field of micro force measurement, in particular to a method and device for measuring adhesion. Background technique [0002] Particle agglomeration is a common phenomenon in the fields of chemical industry, materials and environmental protection. In dust removal, the larger the particle size, the easier it is to collect, otherwise it is difficult to collect, so the PM 2.5 When the particles are agglomerated, the diameter becomes larger, which is beneficial to dust removal; and the tighter the agglomerates formed by the agglomeration, the harder it is to disperse and destroy again. The root of measuring the effect of particle agglomeration is the tiny adhesion force between the agglomerated particles. The micro-adhesion force between particles mainly includes van der Waals force, liquid bridge force, electrostatic force and magnetic field force, etc. Under wet conditions, the liquid bridge force is 1-2 orders of magnitude ...

AI Technical Summary

Problems solved by technology

The US patent "Apparatus form measuring cohesion force of particulate materials" (US4279165) can be used to measure the force between particles, but this measurement device puts many particles together, because it is difficult for a large number of particles to have the same particle size, this device can only reflect a certain particle The adhesion force within the diameter range cannot reflect the actual adhesion force between two particles

The micro-cantilever sensor can measure the micro-force of the micro-Newton level, such as the Chinese patent "Measurement structure of critical contact length and adhesion force of micro-cantilever contact adhesion" (CN102980506B), but its structure is complicated and difficult to measure two Adhesion force between particles under the action of liquid bridge

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