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Pumping Small Molecules Selectively through an Energy-Assisted Assembling Process at Nonequilibrium States.

Huimin Fu1, Nengjie Cao1, Wang Zeng2

  • 1South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China.

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Researchers achieved controlled molecular distribution in non-equilibrium systems by actively transporting molecules against concentration gradients. This selective process, demonstrated with acid orange (AO7), shows potential for artificial active materials.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Precise spatial and temporal control of molecular distribution is vital in biological systems and artificial active materials.
  • Understanding nonequilibrium processes is key to developing advanced functional materials.

Purpose of the Study:

  • To demonstrate active transport and controlled accumulation of small molecules against concentration gradients.
  • To investigate the coassembly mechanism of acid orange (AO7) with transient anhydrides.
  • To explore the potential of chemical fuels in directing molecular self-organization.

Main Methods:

  • Utilized acid orange (AO7) and TMC10COOH in an aqueous solution.
  • Employed 1-ethyl-3-(3-(dimethylamino)propyl) carbodiimide hydrochloride (EDC) as a chemical fuel.
  • Observed molecular coassembly and transport phenomena using spectroscopic and visual methods.

Main Results:

  • AO7 molecules coassembled with transient anhydride (TMC10CO)2O, forming larger structures.
  • Active transport of AO7 molecules against the concentration gradient was achieved.
  • Accumulation of AO7 at the EDC injection site was observed and maintained.
  • The process operated under nonequilibrium conditions with high selectivity.

Conclusions:

  • Demonstrated selective, active transport and accumulation of small molecules in nonequilibrium states.
  • The coassembly mechanism driven by a chemical fuel offers a pathway for controlled molecular distribution.
  • This approach holds promise for the design of sophisticated artificial active materials.