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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...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...

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Smectic foams.

Torsten Trittel1, Thomas John, Ralf Stannarius

  • 1Institut für Experimentalphysik, Otto-von-Guericke-Universität Magdeburg, 39106 Magdeburg, Germany. trittel@st.ovgu.de

Langmuir : the ACS Journal of Surfaces and Colloids
|February 26, 2010
PubMed
Summary
This summary is machine-generated.

Stable two-dimensional foams were created using thermotropic smectic mesogens (8CB) in the smectic A phase. These foams exhibit distinct aging stages, evolving towards hexagonal cells and self-similar scaling, driven by gas exchange rather than film rupture.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Physical Chemistry

Background:

  • Thermotropic smectic mesogens possess layered structures enabling stable foam formation.
  • Previous research has explored liquid crystal phases but not extensively their foam stability and dynamics.

Purpose of the Study:

  • To investigate the formation and structural evolution of two-dimensional foams using 8CB in the smectic A phase.
  • To analyze the aging dynamics and identify the mechanisms driving foam coarsening.
  • To explore foam stability across phase transitions into the nematic state.

Main Methods:

  • Preparation of 2D foams of 8CB in the smectic A phase.
  • Microscopic observation and structural analysis of foam cells over time.
  • Quantitative measurement of aging dynamics, including cell structure and gas exchange.

Main Results:

  • Three distinct stages of foam evolution were identified: initial multilayers, development of hexagonal cells, and an asymptotic structure with self-similar scaling.
  • Gas exchange between cells was confirmed as the primary mechanism for structural changes, with film rupture being negligible in the smectic phase.
  • Smectic foams demonstrated stability up to several degrees above the transition to the nematic phase due to surface smectic ordering.
  • Nematic foams coarsened rapidly, dominated by film rupture, and foams could not be prepared with 5CB, which lacks a smectic phase.

Conclusions:

  • The study quantitatively confirms predicted distributions and asymptotic scaling laws for smectic foams.
  • Smectic ordering at film surfaces allows foams to persist into the nematic phase, albeit with accelerated coarsening.
  • The layered structure of thermotropic smectic mesogens is crucial for forming stable 2D foams, with gas diffusion governing aging dynamics.