the property exhibited by a fluid that is in a liquid state when flowing and in a semisolid, gelled state when at rest. Most drilling fluids must be thixotropic so that cuttings will remain in suspension when circulation is stopped.
Reversible gel-sol-gel transition that is characterized by a reduction in viscosity upon the application of shearing stress.
A property of paint whereby it has a gelled structure when undisturbed but when stirred is quite mobile. This is caused by weak chemical bonds that set up in the paint when it is static, but are easily broken down when stirred. Products are usually made thixotropic to aid application. Tomato ketchup is an everyday example of a thixotropic product.
Decrease in consistency, as a result of shearing/followed by an increase in hardening after the shearing stopped.
Any change in the consistency of a paint or enamel, which occurs when it is allowed to stand in an undisturbed condition. If the material increased in “body,” it is called “positive thixotropy,” whereas if the body decreases, the term is “negative thixotropy” is used. Thixotropic generally infers a heavy bodied paint.
The property of a coating or other material that enables it to stiffen in a relatively short time on standing at rest buy upon isothermal agitation to change to a very soft consistency or to a fluid of high viscosity, the process being completely reversible. (The material becomes fluid if stirred and thickens when agitation ceases.)
The ability of a coating material to thicken on standing but to regain flow with agitation.
This is a property that is exhibited by certain gels. A thrixopic gel maintains its shape and appears solid, but if it is subjected to certain forms of disturbance, such as shaking, it will start to flow like liquid. Possible explanation for bleeding statues etc.
Gel - fluid reversible change of viscosity between resting and stressed state.
The property of certain gelatin systems of becoming fluid on agitation, and coagulating again when left at rest. This type material is called thixotropic
Property of certain materials which liquefy when they are subjected to vibratory forces such as simple stirring or shaking and then solidify when left standing.
The characteristic of certain viscous substances to become less viscous through mechanical action (stirring). Thixotropic materials are used in offset printing inks to enhance the quality of multi-color printing. The lower viscosity inks in the inking unit solidify to a certain degree on the printing stock before drying, and additional printing processes are thus optimized.
The property of certain gels to become liquid upon being shaken or agitated and to coagulate again when left in an undisturbed condition.
The tendency for the viscosity of a liquid to be shear-rate dependent. When a liquid is rapidly shaken, brushed, or otherwise mechanically disturbed the viscosity decreases rapidly.
The ability of certain clay suspensions to thicken up on standing; characteristic of partially or over-flocculated slips.
time dependant shear-thinning behaviour. All thixotropic materials are shear thinning, however all shear thinning materials need not be thixotropic..
tendency of grease or other material to soften of flow when subjected to a shearing stress, followed by a return to original consistency when the stress is removed.
The property of a material that causes it to change from a thick, pasty consistency to a fluid consistency upon agitation, brushing, or rolling.
When slip, liquified clay, is over flocculated it becomes somewhat thick and gelatinous. This is called thixotropy.
Term which describes the flow character of a liquid or paste. Liquids that are thixotropic flow under shear but flow less when the shear is removed. Best example is ketchup.
False body. The property of a paste or fluid to thicken or set up to a paste or semi-gel when allowed to stand. Agitation breaks it down but further standing will again permit a viscosity rise.
Memory’ property of a fluid (especially of solder paste) whereby its viscosity (resistance to flow) depends on its recent history of flow and not just on the force applied to it. See also shear thinning.
The property of a lubricating grease to revert to its original consistency when the consistency has been decreased as a result of shearing.
The property of a lubricant to become momentarily softer or thinner due to mechanical action such as stirring or kneading.
Property of certain materials, such as gels, to soften or liquify upon agitation (viscosity decreases upon application of shear), and to stiffen to its original state when allowed to rest (viscosity increases). A product that possesses thixotropy can resist the pull of gravity.
The tendency of a material to cling to a vertical surface.
Thixotropy is the property of some non-newtonian pseudoplastic fluids to show a time-dependent change in viscosity; the longer the fluid undergoes shear, the lower its viscosity. A thixotropic fluid is a shear-thinning fluid which takes a finite amount of time to reach an equilibrium viscosity when introduced to a step change in shear rate. However, this is not a universal definition; the term is sometimes applied to pseudoplastic fluids without a viscosity/time component.