Thixotropy arises because particles or structured solutes require time to organize. Some fluids are anti-thixotropic: constant shear stress for a time causes an increase in viscosity or even solidification. Fluids which exhibit this property are sometimes called rheopectic.
What is the thixotropic behavior of suspension?
Suspensions show thixotropic behavior when the suspended phase is capable of forming a structure and the steady state degree of aggregation is a function of the steady state rate of shear.
How does thixotropic effect work?
Thixotropy is that property of a body by virtue of which the apparent viscosity is temporarily reduced by previous deformation. This means that with thixotropic: material the viscosity depends on the time of stirring as compared with a pseudoplastic material which depends on the rate of shear.
What does thixotropy mean?
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Is ice cream thixotropic fluid?
This type of flow behaviour is shown by all gel-forming systems. Typical examples of thixotropic fluids are yoghurt, mayonnaise, margarine, ice cream and brush paint.
Is milk a thixotropic fluid?
Human milk showed non-Newtonian, shear-thinning, thixotropic behavior with both yield and flow stresses. Storage and aging increased milk density and decreased viscosity.
What is the rheopectic fluid?
Rheopectic fluids are liquids or gases whose viscosity of the fluid increases with stress over time. The behaviour of these fluids can be described as a time-dependent dilatant behaviour. Thus, these fluids are a rare class of non-Newtonian fluids.13 May 2020
What is the meaning of thixotropic?
Definition of thixotropy : the property of various gels of becoming fluid when disturbed (as by shaking) … says that blood liquefaction can be explained in terms of a phenomenon called thixotropy.
What is thixotropic solution?
A thixotropic solution at rest is a weak, often pourable, gel. In other words, a thixotropic solution has properties of a gel (at rest) and properties of a fluid when a shear force is applied. Alginates (Chapter 14). are examples of hydrocolloids whose solutions can exhibit thixotropic behavior.
What makes a material thixotropic?
Thixotropic materials display a viscosity that decreases with shear rate and time of shear as well. They possess a solid structure that requires time to form under high pressure (or low temperature) and that structure is disrupted by shear stress.
Is toothpaste a thixotropic fluid?
Thixotropy is the property that explains why personal care products like hair gels and toothpaste are liquid when squeezed out of the tube but recover to their initial solid state afterwards in order to remain in place.
What is the importance of thixotropy?
Thixotropy is important for applications that require the material to flow easily during dispensing but then must stay in place once they are dispensed. This allows materials to be dispensed in exact patterns and shapes without any sagging or slumping after application.
What is the role of thixotropy in formulation?
Thixotropic property plays a key role in liquid filling of hard gelatin capsules, and there is a positive relationship between the dispersed phase for the proper filling of molten dispersions into capsules and apparent viscosity of the formulation [59].5 Jun 2009