Thixotropy


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Related to Thixotropy: Rheopexy

thixotropy

[thik′sä·trə·pē]
(physical chemistry)
Property of certain gels which liquefy when subjected to vibratory forces, such as ultrasonic waves or even simple shaking, and then solidify again when left standing.

Thixotropy

 

the ability of certain structured disperse systems to revert spontaneously to an initial structure that had been disrupted by mechanical action.

Thixotropy is manifested in gels, pastes, suspensions, and other systems with coagulation disperse structures. Such systems liquefy when shaken or stirred with sufficient intensity and then thicken or harden after the mechanical action stops. Thixotropic restoration of structure is a mechanically reversible, isothermal process that can be repeated many times. In the broader sense, thixotropy is a temporary reduction in the effective viscosity of a viscous fluid or plastic system that results from deformation of the system and is independent of the physical nature of the changes occurring in the system.

Thixotropy is of great practical importance. Thixotropic materials are used in the technology of silicate and plastic technology and in food engineering. Some soils (quicksands), biological structures, and technological materials (drilling muds, paints, greases) also have thixotropic properties.

REFERENCES

Voiutskii, S. S. Kurs kolloidnoi khimii, 2nd ed. Moscow, 1975. Page 317.
Nauka o kolloidakh, vol. 1. Edited by H. R. Kruyt. Moscow, 1955. (Translated from English.)

L. A. SHITS

References in periodicals archive ?
But, thixotropy is a reversible effect, probably by a certain rearrangement of the starch molecules to cope with the mechanical stress.
A Study on the Thixotropy of Egyptian Bentonite Suspensions" Petroleum Science and Technology, 31: 1980-1991.
shear rate profile, thixotropy calculation, creep behavior, recovery after flow, and temperature sensisitivity.
The composition can contain a resin, a filler, a thixotropy agent, and hardeners.
Influence of thixotropy on stability characteristics of cement grout and concrete, ACI Materials Journal 99(3): 234-241.
This, the company says, is where Araldite AW 4856/Hardener HW 4856's chemical thixotropy can deliver significant advantages in developing non-slump properties very quickly after mixing and offering controlled flow as well as resistance to sagging.
According to the rheological concept--study of deformation and flow of various substances-structural-mechanical properties of ointment preparations include plasticity, structural viscosity and thixotropy.
11) Dispersion in water, even at relatively low concentrations, causes significant viscosity increase and thixotropy.
Part III addresses casting and the rheological behavior of concrete, offering four chapters on modeling the flow of self-compacting concrete, thixotropy, formwork pressure generated by fresh concrete, and pumping of conventional vibrated and self-compacting concrete.