HYBRID EVENT: You can participate in person at Singapore or Virtually from your home or work.

2nd Edition of International Conference on

Materials Science and Engineering

March 28 -30, 2022 | Singapore

2021 Speakers

Integration of molecular machines and motors into supramolecular materials: structural properties studied by small-angle neutron and X-ray scattering

Eric Buhler, Speaker at
The University of Paris, France
Title : Integration of molecular machines and motors into supramolecular materials: structural properties studied by small-angle neutron and X-ray scattering

Abstract:

Switchable functional molecules capable of producing mechanical work constitute an active focus in nanotechnologies as they can be a source of components for molecular-based devices and materials. In particular, the dynamic nature of mechanically interlocked molecules allows their components to undergo relative internal movements, which can be exploited in translation and circumrotation. When it comes to using molecular machines to facilitate the creation of materials on the macro-scale, the primary concern is whether the nano-sized machines will be able to amplify their mechanical behavior to create a response in the bulk material. Hence, one of the most fundamental and challenging objectives associated to nano-machines rests on their coupling (in space and time) in order to transfer controlled motions from the molecular arena to the supramolecular and macroscopic scale.
In the present work, we have developed two kinds of responsive contractile polymeric materials, which can behave as artificial muscles: i) The first one concerns nano-machines linked into a supramolecular polymer in which we produced micrometric motions (contraction/extension) by the integration of thousands of single contractile nano-switches by altering the pH of the solution; just like myofibrils do when packed in bundles in muscles. ii) The second one is based on the connection of light-driven rotary motors acting as reticulation units in an entangled polymer network. Small-angle neutron scattering (coupled with light and X-ray scattering) has been used to investigate the structure of the supramolecular self-assemblies of nano-machines before and after the induced structural changes as well as the dynamics of the contraction process at different length and time scales. We discuss here the relation between the local and overall structure of the self-assemblies and the properties of the materials. We show that these findings open up new possibilities of using molecular machines in smart responsive materials.

Audience Take Away:

  • How integrating molecular motors and machines into polymeric materials
  • New responsive materials, actuation between macroscopic phases
  • Structure as seen using scattering techniques

Biography:

Prof. Eric Buhler currently holds a Full Professor position in soft condensed matter at Université de Paris (France). In 1996, he received his Ph.D. degree in physics at the University of Strasbourg investigating the structural and dynamical properties of wormlike micelles. Prof. E. Buhler subsequently obtained a postdoctoral position (1996-1998) at the University of North Carolina at Chapel Hill (USA), where he studied the structural behavior of copolymers in supercritical carbon dioxide using scattering techniques. In 1998, he joined the University of Grenoble, France, where he obtained an Associate Professor position (1998-2006). He spent two years (2002-2004) at the French National Research Center (CNRS) of Montpellier (Charles Coulomb Institute) as a Visiting Professor. In 2006, he joined Université de Paris, where he is currently a Full Professor. His research focuses on the structure and dynamics of supramolecular polymers, polyelectrolytes, nanoparticles complexes, and nano-machines. He has published more than 80 research articles in peer review journals.

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