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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Island Ripening via a Polymerization-Depolymerization Mechanism.

Martin Hesse1, Bernhard von Boehn1, Andrea Locatelli2

  • 1Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3-3a, D-30167 Hannover, Germany.

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|October 10, 2015
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Summary
This summary is machine-generated.

Catalytic methanol oxidation drives the movement and merging of ultrathin vanadium oxide islands on Rh(111). This 2D island ripening is governed by a reaction-sensitive polymerization-depolymerization equilibrium.

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Area of Science:

  • Surface Science
  • Catalysis
  • Materials Science

Background:

  • Ultrathin vanadium oxide layers on Rh(111) are model systems for studying surface reactions.
  • Catalytic reactions can significantly influence the morphology and dynamics of supported nanomaterials.

Purpose of the Study:

  • To investigate the dynamic behavior of ultrathin vanadium oxide (VOx) islands during catalytic methanol oxidation.
  • To elucidate the mechanism controlling the 2D ripening and coalescence of VOx islands under reaction conditions.

Main Methods:

  • In situ surface science techniques were employed to monitor VOx island evolution during methanol oxidation.
  • Analysis focused on the movement and coalescence of VOx islands on the Rh(111) surface.

Main Results:

  • A distinct 2D ripening of VOx islands was observed, directly controlled by the catalytic reaction.
  • Neighboring VOx islands were found to migrate and coalesce under reaction conditions.
  • The observed island dynamics were explained by a polymerization-depolymerization equilibrium sensitive to adsorbate coverage gradients.

Conclusions:

  • Catalytic methanol oxidation actively controls the morphology of ultrathin VOx layers.
  • The reaction-induced movement and coalescence of VOx islands are driven by a dynamic chemical equilibrium.
  • Understanding these surface dynamics is crucial for designing efficient catalytic systems.