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Viscosity of Fluid

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.

Viscosity

Viscosity

When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...

Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

Types of Fluids

Types of Fluids

Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...

Superplasticizers

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...

Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Stimuli-responsive viscosity modifiers.

Bhargavi Bhat¹, Silabrata Pahari¹, Joseph Sang-Il Kwon²

¹Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.

Advances in Colloid and Interface Science

|October 23, 2023

Summary

Stimuli responsive viscosity modifiers change flow properties with triggers like pH or temperature. These smart materials are key for advanced applications in medicine, energy, and beyond.

Keywords:

Packing parameter Rheology Self assembly Stimuli responsive systems Supramolecular materials Viscosity modifiers

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Area of Science:

Materials Science
Rheology
Polymer Chemistry

Background:

Stimuli responsive viscosity modifiers are crucial for smart material development.
Applications span biomedical fields (tissue engineering, drug delivery) and industries (energy, automotive).
Material properties and rheology are sensitive to stimuli like pH, temperature, light, and salinity.

Purpose of the Study:

To overview structures for stimuli responsive viscosity modification.
To analyze rheological theories and their correlation with structural changes.
To present key mechanisms driving stimuli responsive viscosity changes.

Main Methods:

Literature review of stimuli responsive materials and rheological theories.
Analysis of models like molecular packing parameter, tube reptation, and stress relaxation.
Categorization of five primary viscosity modification mechanisms.

Main Results:

Five mechanisms identified: packing parameter modification (functional groups, dynamic bonds), mesh formation, chain conformation changes, and particle jamming.
Exploration of structure-property relationships in stimuli responsive systems.
Overview of recent literature employing these concepts for novel materials.

Conclusions:

Stimuli responsive viscosity modifiers offer tunable rheological properties.
Multi-stimuli responsive systems provide enhanced functionality for precise applications like drug delivery.
Understanding structure-property relationships is vital for designing advanced smart materials.