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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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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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When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through...
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Micro and macrorheology at fluid-fluid interfaces.

Joseph R Samaniuk1, Jan Vermant

  • 1Department of Chemical Engineering, KU Leuven, University of Leuven, W. de Croylaan 46, bus 2423, Heverlee, 3001, Belgium. joseph.samaniuk@cit.kuleuven.be.

Soft Matter
|June 18, 2014
PubMed
Summary
This summary is machine-generated.

Discrepancies in interfacial rheology measurements between micro and macrorheological methods were investigated. Artifacts in particle-tracking microrheology can cause significant underestimations of surface viscosity, but can be resolved for some materials.

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Area of Science:

  • Interfacial Science
  • Physical Chemistry
  • Materials Science

Background:

  • Interfacial transport phenomena are crucial for emulsions, foams, and membranes.
  • Discrepancies exist between micro- and macrorheological measurements of interfacial properties.
  • Understanding these differences is key to accurate interfacial characterization.

Purpose of the Study:

  • To compare interfacial rheological measurements using both microrheological and macrorheological methods.
  • To identify artifacts in particle-tracking microrheology that lead to significant measurement discrepancies.
  • To reconcile differences in surface viscosity measurements for various monolayers.

Main Methods:

  • Employed both particle-tracking microrheology and macrorheological techniques.
  • Investigated different monolayers at an air-water interface.
  • Utilized an interfacial stress rheometer (ISR) with varying needle aspect ratios.

Main Results:

  • Identified artifacts like unintentional tracking of non-interfacial particles, interfacial heterogeneities, and static noise as sources of error in microrheology.
  • Achieved good agreement between micro- and macrorheological methods for poly(tert-butyl methacrylate) (PtBMA) and dipalmitoylphosphatidylcholine (DPPC) after addressing artifacts.
  • Observed orders-of-magnitude disagreement for hexadecanol, potentially due to compressibility or Marangoni stress effects.

Conclusions:

  • Artifacts in particle-tracking microrheology can lead to substantial underestimation of surface viscosity.
  • Resolved discrepancies for PtBMA and DPPC suggest microrheology can be reliable when artifacts are managed.
  • Further investigation into compressibility and Marangoni effects is needed to explain discrepancies in systems like hexadecanol.