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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Membrane Fluidity

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Mosaic nature of the membrane
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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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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Switchable viscosity triggered by CO2 using smart worm-like micelles.

Xin Su1, Michael F Cunningham, Philip G Jessop

  • 1Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6.

Chemical Communications (Cambridge, England)
|February 26, 2013
PubMed
Summary
This summary is machine-generated.

Two aqueous solutions exhibit switchable viscosity in response to carbon dioxide (CO2). One forms worm-like micelles with CO2, while the other shows high viscosity without CO2.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Colloid Science

Background:

  • Developing smart materials with tunable properties is crucial for advanced applications.
  • Carbon dioxide (CO2) responsive systems offer unique opportunities for stimuli-responsive materials.
  • Surfactant-based aqueous solutions can exhibit complex phase behavior and rheological properties.

Purpose of the Study:

  • To investigate the CO2-responsiveness of aqueous solutions containing specific surfactants and additives.
  • To characterize the switchable viscosity behavior of these solutions under varying CO2 conditions.
  • To explore the formation of supramolecular structures like worm-like micelles in response to CO2.

Main Methods:

  • Preparation of aqueous solutions of sodium octadecyl sulfate (SOS) with 2-(dimethylamino)ethanol (DMAE).
  • Preparation of aqueous solutions of sodium stearate with sodium nitrate.
  • Rheological measurements and visual observations under controlled CO2 presence and absence at 60 °C.

Main Results:

  • The SOS/DMAE solution formed viscoelastic worm-like micelles in the presence of CO2 at 60 °C, exhibiting switchable viscosity.
  • The sodium stearate/sodium nitrate solution displayed high viscosity specifically in the absence of CO2 at 60 °C.
  • Both systems demonstrated reversible viscosity changes dependent on CO2 concentration.

Conclusions:

  • Two distinct CO2-responsive aqueous systems with switchable viscosity have been successfully developed.
  • These systems showcase tunable rheological properties based on the presence or absence of CO2.
  • The findings open possibilities for applications in areas requiring controlled fluid behavior, such as smart fluids or drug delivery.