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Local Energy Conversion in Catalytic Janus “Micro-motors”

Event Details

Event Dates: 

Thursday, February 27, 2014 - 12:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Mykola Tasinkevych

Speaker Affiliation(s): 

Max Planck Institute, Stuttgart
Seminar Type/Subject

Scientific Seminar Type: 

  • Condensed Matter Seminar

Event Details & Abstract: 

Synthetic micro-motors which can move cargo in a well controlled way through a liquid environment are of significant interest for applications such as renewable energy research, targeted drug delivery, biosensing, and shuttle-transport of living cells. One promising approach is to use catalytically active Janus colloidal particles as model micro-motors. This type of particles harvest “chemical” free energy from the surrounding liquid environment and then transform it into mechanical energy. Due to an asymmetric decoration of their surface with a catalyst, which promotes a specific chemical reaction in the surrounding liquid, concentration gradients of the reaction products develop along the surface of the particle. Depending on the systems, various self-propulsion mechanisms emerge, such as bubble propulsion, self-electrophoresis, or self-diffusiophoresis, which in some systems can be activated by light. In this talk only the last mechanism, i.e. self-propulsion due to self-generated electrically neutral solute gradients, shall be considered.