In this talk we shall discuss the dynamics of an active polymer in a porous matrix and show that the long-time diffusion coefficient can be largely tuned with an optimal geometric criterion stating that the run length of the particle equals roughly the geometric pore size [1]. We shall further address the case of dense entangled active polymer solutions and extract new scaling laws generated by activity [2]. Finally breathing particles such as microgel particles an oscillatory temperature field will be discussed. The breathing process can be exploited to anneal crystalline defects [3].
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