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Reversible transition between SDS@2β-CD microtubes and vesicles triggered by temperature.

Chengcheng Zhou1, Xinhao Cheng, Yun Yan

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, People's Republic of China.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 8, 2014
PubMed
Summary
This summary is machine-generated.

Temperature changes can reversibly switch self-assembled structures like vesicles and microtubes in supramolecular systems of sodium dodecyl sulfate (SDS) and β-cyclodextrin (β-CD). This discovery offers new insights into temperature-triggered responsive materials.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Responsive materials often rely on host-guest complex association/dissociation.
  • Cyclodextrins (CDs) are widely used in host-guest chemistry.
  • Non-amphiphilic self-assemblies offer unique material properties.

Purpose of the Study:

  • To investigate temperature-triggered self-assembly transitions in SDS-β-CD supramolecular systems.
  • To explore the role of water and CD hydrogen bonding in these transitions.
  • To demonstrate a novel temperature-responsive mechanism for CD-based host-guest systems.

Main Methods:

  • Preparation of SDS-β-CD supramolecular systems at a 1:2 molar ratio.
  • Observation of self-assembled structures (vesicles, microtubes) using microscopy.
  • Control experiments in heavy water to probe hydrogen bonding roles.
  • Temperature variation studies to induce and observe structural transitions.

Main Results:

  • SDS and β-CD form channel-type SDS@2β-CD units that self-assemble into vesicles and microtubes.
  • Vesicles and microtubes reversibly interconvert with changes in temperature.
  • Water molecules dominate hydrogen bonding at higher temperatures/lower concentrations, while CD-CD interactions dominate at lower temperatures/higher concentrations.
  • Specific transitions observed: vesicle to microtube (decreasing temperature, 5% system) and microtube to vesicle (increasing temperature, 10% system).

Conclusions:

  • Temperature is a viable trigger for self-assembly transitions in SDS-β-CD supramolecular systems.
  • The findings reveal a new temperature-responsive behavior for CD host-guest systems.
  • This work provides a foundation for designing advanced temperature-responsive materials.