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Organic nanofibers embedding stimuli-responsive threaded molecular components.

Vito Fasano1, Massimo Baroncini, Maria Moffa

  • 1Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento , via Arnesano I-73100 Lecce, Italy.

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Researchers created smart polymer nanofibers with molecular machines that change stiffness when exposed to acid or base. This breakthrough enables new chemical sensors and responsive materials.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Nanotechnology

Background:

  • Interfacing molecular machines with solid-state materials is crucial for sensing and actuation applications.
  • Polymer nanofibers offer a platform for manipulating and organizing functional molecules.

Purpose of the Study:

  • To develop electrospun nanocomposites embedding a stimuli-responsive rotaxane system.
  • To investigate the integration of molecular machines within polymer nanofibers for enhanced functionality.

Main Methods:

  • Electrospinning of polymer nanofibers containing a self-assembling rotaxane system.
  • Utilizing optical (UV-vis light) and chemical (acid/base) stimuli to actuate the molecular machines.
  • Characterizing the changes in mechanical properties of the nanofibers.

Main Results:

  • The rotaxane system within nanofibers responded to acid/base vapors and light, similar to solution-phase behavior.
  • Nanoscale mechanical changes in the molecular machines led to measurable macroscopic property variations in the nanofibers.
  • Young's modulus of aligned nanofibers significantly increased upon dethreading of the rotaxane components.

Conclusions:

  • The developed composite nanosystems demonstrate potential for chemical sensors and photonic actuators.
  • The integration of molecular machines into nanofibers enables the creation of environmentally responsive materials.
  • This work highlights the importance of interfacing supramolecular systems with solid-state nanostructures.