Why do we study rheology?

In simpler terms, rheology is used to establish the relationship between strains and stresses of substances with complex microstructures and establish predictions for the mechanical behavior of these substances. Rheology measurements are focused on the rheological properties of materials: Shear stress τ (mPa-s)

Why rheology is important?

Researchers believe that rheological characterization is essential for the development, optimization, and processing of foods. Food rheology also determines the food texture. Rheological flow properties deal with the perception of food when we touch or put it into our mouth.

Why is it necessary to study the rheological property of polymers?

Understanding the rheological properties of polymers through laboratory testing can help to optimize products and process conditions, thereby saving costs and minimizing potential waste.

What does the science of rheology study?

Rheology is the science of measurement of deformation. Virtually all materials deform in response to an imposed stress ('everything breaks if you hit it hard enough') and the materials present in the eye range from liquid-like to soft-solid behaviour.

What is rheology and its applications?

Rheology is science which treats the deformation and flow of materials. The science of rheology is applied to the physics, chemistry, engineering, medicine, dentistry, pharmacy, biology and so on. Classical theory of elasticity treats the elastic solid which is accordant to Hooke's law [ 1].

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What are the importance of rheology in practice of pharmacy?

Rheology is therefore crucially important as it will directly affect the way a drug is formulated and developed, the quality of the raw and finished product, the drug efficacy, the way a patient adheres to the prescribed drug, and the overall healthcare cost.

Why is rheology important in cosmetics?

Characterization of the rheological properties of a system, and understanding the interaction of the various ingredients that build up the complex structure of cosmetic products is critical since it reveals why the system behaves the way it behaves under various conditions and leads to the required modifications needed ...

What does rheology depend on?

Rheology is the scientific field that encompasses the flow phenomena of matter (solids, liquids, and gases) and notably involves time-dependent behavior under the influence of stresses.

What is the difference between rheology and viscosity?

Viscosity is a quantitative measurement that is useful in chemistry. These two terms are related to fluids such as liquids and gases. The key difference between rheology and viscosity is that rheology is the study of the flow of matter whereas viscosity is a measure of its resistance to deformation.

What does rheology mean in chemistry?

Rheology is defined as the study of the deformation and flow of a fluid. It is an important property of a molten polymer; it relates the viscosity with the temperature and shear rate, and is consequently linked to polymer processability.

What is meant by rheological properties?

Rheology is the branch of physics in which we study the way in which materials deform or flowin response to applied forces or stresses. The material properties that govern the specific way in which these deformation or flow behaviors occur are called rheological properties.

What are examples of rheological properties?

The most common rheological properties are yield stress, relaxation times, viscosity and compliance. Rheological properties study the behavior of fluids under mechanical loading. The solid structure, having a defined shape, deforms and stresses when subjected to a load.

What is rheology modifiers in cosmetics?

Rheology modifiers are often referred to as thickeners, and whilst increasing the apparent viscosity will confer a feeling of “quality” to the formulation, this is only one aspect of rheological control. The product itself can be Newtonian or pseudoplastic, thixotropic, be a ringing gel or a stringy flowable liquid.

Is lotion Pseudoplastic fluid?

According to the ana - lysis of a down-curve at lower shear rates (0–600 s-1) it was con- firmed that samples of body lotions are pseudoplastic sub- stances and the pow- er law model, t = Kg·p, was used (regression coefficients higher than 0.98) to deter- mine consistency parameter, K, and flow index, p.

Why is viscosity important in pharmaceutical industry?

Viscosity is a key indicator of quality in a wide range of biotech applications, from pharmaceuticals and mechanical devices to medical laboratories and research centers. Viscosity measurement is important when it comes to determining a wide range of data points—such as at what point can a fluid flow through a syringe?

Why viscosity is important in pharmacy?

The viscosity of liquid and semi-solid preparations has to be maintained batch-to-batch to ensure uniform drug potency through all stages of production. Testing the viscosity is a very important practice by quality control in the pharmaceutical manufacturing industry.

Why do we study physical pharmacy?

It covers areas such as solubility, pharmacokinetics and drug delivery. Physical pharmacy serves as principles that guide the pharmaceutical developments. It also serves as a basis for the understanding of drug absorptions, distributions, metabolism, and eliminations that happen during the course of drug treatment.

What is rheology control?

With HDK^® pyrogenic silica, liquid coating formulations retain an optimum rheology profile throughout their product life cycle. During storage, settling is prevented while, in the application phase, leveling and sagging behavior are perfectly balanced.

How many types of rheological additives are there?

We offer six classes of rheological additives for paints and coatings: Rheovis^® AS: Alkali swellable emulsions (ASE) Rheovis^® HS: Hydrophobically modified alkali swellable emulsions (HASE) Rheovis^® PU: Hydrophobically modified polyurethanes (HEUR)

What is Carbopol used for?

Carbopol® (Carbomer)

In the cosmetic industry, Carbopol is used as a thickener in lotions, creams and gels. It is also used to stabilize, suspend, and control the release of pharmaceutical products. At low concentrations, suspensions flow easily with a slippery feel.

What is the pH of Carbopol?

Carbopol is a polyacrylicacid (PAA) polymer, which shows a sol to gel transition in aqueous solution as the pH is raised above its pK_a of about 5.5 [10].

What type of polymer is Carbopol?

Carbopol^® 676 polymer is a highly crosslinked polyacrylic acid polymer. It has short flow characteristics and relatively high viscosity performance.

How do rheology modifiers manage viscosity?

Rheology Modifiers Manage Viscosity

KU viscometers are associated with mid-shear fluid flow, such as paint viscosity as it's being loaded onto a brush or roller or as the brush or roller leaves the applied surface. Finally, Cone and Plate viscometer are associated with high-shear flow.

How do rheology modifiers work?

While a surfactant is the key ingredient used to control surface tension, a rheology modifier is the ingredient used to control the viscosity of the ink, or more precisely the rheology profile of the ink, which includes the yield stress and the viscosity at different shear modes and rates.