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.

Why is rheology important in cosmetics?

Rheological measurements provide information about storage stability, processability or flow properties of liquid and semi-solid formulations, which are essential for quality control and further product development.

What are the different types of rheological additives?

Is xanthan gum a rheology modifier?

Structuring formulations in acidic conditions has been a difficult industry challenge as the standard rheology modifier, xanthan gum, does not function well at low pH.

What is rheological agent?

Rheological agents are multi-functional, ubiquitous ingredients found in most formulations that can significantly impact stability and performance. Nothing is more fundamental to a formulation than creating structure.

Rheology Modifiers ! Cosmeceutical Excipients ! Cosmetic Science ! Unit-1 L-5

What is rheology used for?

Rheology is used to describe and assess the deformation and flow behavior of materials. Fluids flow at different speeds and solids can be deformed to a certain extent.

What are the examples of rheology?

Many physiological materials and fluids exhibit complicated rheology. Within the eye, examples include the vitreous humour, the liquid in the tear film, and the blood in capillaries.

How is xanthan gum used as an emulsifier?

First create the emulsion like you usually would. Then blend in a pinch of xanthan gum. It will thicken the liquid slightly and help the emulsion hold for a much longer time. For an even stronger emulsion you can add some soy lecithin at a ratio of 0.1% to 0.5%.

How does xanthan gum increase viscosity?

The increase of viscosity with increasing xanthan gum concentration has been attributed to intermolecular interaction or entanglement that increases the effective macromolecule dimensions and molecular weight [4].

Is viscosity a rheological property?

The property of rheology is viscosity, which is defined as the measure of the resistance of a fluid to gradual deformation by shear or tension.

What is PU thickener?

Polyurethane thickener is a low-odor, solvent-free water-based non-ionic associative rheology modifier (hydrophobic modified polyurethane), providing excellent flow and leveling, uniform film-forming performance, and gloss display Performance and high thickening efficiency.

What kinds of rheological materials are paint and grease?

Solvent-based rheological additive

Our solvent-based rheology additive is used as gelling and thickening agents. They have major applications such as paints, coatings, grease lubricants, oil drilling fluids, and inks.

Why is rheology important in pharmaceutical industry give examples?

Rheological characterization tools, such as viscometers, allow drug producers to directly affect how a drug is formulated and developed, cutting across parameters and conditions to arrive at product characteristics that can be quantified.

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.

What is xanthan gum used for in cosmetics?

Xanthan gum is a natural product which is non-toxic and non-irritating. It can be used in combination with other thickeners and stabilizers to improve texture, flow behavior, stability and appearance. All these properties make xanthan gum a very effective thickening and stabilizing agent for cosmetics and toiletries.

What is the ratio of xanthan gum to liquid?

To use xanthan gum in recipes, use about 1/8 teaspoon per cup of liquid and combine these in a blender, not by hand. It will "gum" almost instantly and form clumps if not constantly in motion while it is being incorporated into the liquid.

What does xanthan gum do for skin?

The fermentation process uses the bacteria Xanthomonas campestris, which is where this ingredient's name is derived. Xanthan gum in skin care is used as a thickening agent, texture enhancer, and to stabilize emulsions, which is a general term for mixtures of unlike substances such as oil and water.

How do viscosity modifiers work?

Viscosity modifiers are polymeric molecules that are sensitive to temperature. At low temperatures, the molecule chain contracts and does not impact the fluid viscosity. At high temperatures, the chain relaxes and an increase in viscosity occurs.

What is viscosity enhancer?

To increase the duration of action, some artificial tears, made viscous by the addition of high-molecular-weight agents such as water-soluble polymers of syn- thetic, semisynthetic, or natural origin, have been introduced. These compounds are usually referred to as viscosity enhancers.

How do you increase viscosity?

The simplest way to increase the viscosity of oil while maintaining its purity is to reduce its temperature. Obtain a small refrigerator. You could use the refrigerator in your kitchen, but you risk contaminating your food and beverages with oil fumes. Nothing fancy or overly powerful is required.

What is also known as rheology?

Rheology is the science of flow and deformation of matter and describes the interrelation between force, deformation and time. The term comes from Greek rheos meaning to flow. Rheology is applicable to all materials, from gases to solids.

What does the word rheological mean?

: a science dealing with the deformation and flow of matter also : the ability to flow or be deformed.

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.

Why are rheological properties important?

Rheological properties are important to the design of flow processes, quality control, storage and processing stability measurements, predicting texture, and learning about molecular and conformational changes in food materials (Davis, 1973).