Description of catalytic rates in stimuli-responsive nanoreactors

Jan 26, 2017 | 04:00 PM

Location

Dr. Rafael Roa, EM-ISFM Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin

In recent years, the use of stimuli-responsive polymer coatings has come out as a possible new way to control the catalytic activity of colloids and nanoparticles [1-3]. The polymer coating not only prevents particles from coagulation or aggregation, but actively participates in the catalytic pro- cess by changing the local environment for the reactants. The catalytic rate can be thus flexibly tuned and switched, e.g., by the temperature [1-3], ionic strength, or pH.

In this work we present a comprehensive theoretical framework that, by extending concepts from the Debye-Smoluchowski theory of diffusion [3-5], allows to qualitatively and quantitatively describe the influence of all major experimentally tunable parameters on the nanoreactors’ catalytic rate. We pay special attention to the case of multicomponent systems by analyzing the distribution of reac- tants and products. Thistheoretical framework is also useful to find out whatparameters most sensitively tune such rate, therefore providing theory-guided design principle for stimuli- responsive nanoreactors’ synthesis.

[1] S. Wu, J. Dzubiella, J. Kaiser, M. Drechsler, X. Guo, M. Ballauff, and Y.
Lu, Angewandte Chemie 51, 2229 (2012).
[2] H. Jia, R. Roa, S. Angioletti-Uberti, K. Henzler, A. Ott, X. Lin, J. Möser, Z. Kochovski, A. Sch- negg, J. Dzubiella, M. Ballauff, and Y. Lu, J. Mat. Chem. A, 4, 9677 (2016).
[3] S. Angioletti-Uberti, Y. Lu, M. Ballauff, and J. Dzubiella, J. Phys. Chem. C 119, 15723 (2015). [4] D. F. Calef, and J. M. Deutch, Ann. Rev. Phys. Chem. 34, 493 (1983).
[5] R. Roa, W. K. Kim, M. Kanduč, J. Dzubiella, and S. Angioletti-Uberti. In preparation.

Time & Location

Jan 26, 2017 | 04:00 PM

Seminar Room T 2 (1.4.03)