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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Viscosity01:17

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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...
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Viscosity01:27

Viscosity

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Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a...
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Surface Tension, Capillary Action, and Viscosity02:57

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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...
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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Viscosity of Fluid01:19

Viscosity of Fluid

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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.
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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How to decrease the viscosity of suspension with the second fluid and nanoparticles?

Menghan Xu1, Haifeng Liu, Hui Zhao

  • 1Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, P.O. Box 272, No.130 Meilong Road, Shanghai 200237, People's Republic of China.

Scientific Reports
|November 6, 2013
PubMed
Summary
This summary is machine-generated.

Adding a secondary fluid to suspensions can decrease viscosity and yield stress by forming a hydrophobic membrane. Hydrophobic nanoparticles create composite particles with hierarchical structures, enhancing surface properties and reducing suspension flow resistance.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Secondary fluid addition typically increases suspension viscosity.
  • Recent findings suggest secondary fluids can also decrease viscosity.

Purpose of the Study:

  • Investigate the effect of secondary fluid on suspension properties.
  • Develop composite particles with enhanced hydrophobicity and reduced viscosity.

Main Methods:

  • Forming a hydrophobic membrane around particles using a secondary fluid.
  • Incorporating hydrophobic nanoparticles (nano-CaCO3) to create hierarchical structures.
  • Measuring contact angle, viscosity, and yield stress of suspensions.

Main Results:

  • Secondary fluid formed a hydrophobic membrane, decreasing viscosity and yield stress.
  • Composite particles with hierarchical structures exhibited higher contact angles.
  • Suspensions of composite particles showed significantly lower viscosity and yield stress.

Conclusions:

  • Hydrophobic membrane formation by secondary fluid is key to viscosity reduction.
  • Hierarchical structures on composite particles enhance surface hydrophobicity.
  • This approach offers a novel method for controlling suspension rheology.