Programme

Unfurtunately the monastery Irsee has been closed by the Bavarian government due to the corona virus.

Therefore we have decided to offer the conference as a web conference only.

In those unpredictable times, protecting our participants’ health has the highest priority for us!

The scientific exchange must not come to a complete standstill and we believe that with this web solution we have found a way to keep the scientific community going.

In order to participate in the livestream of the conference as easy as possible and to give your presentation, we recommend the use of the web browsers Google Chrome or Microsoft Edge.

Here you can find detailed instructions for using the livestream.

As a participant of the Bioinspired 2020 you have received an e-mail containing the login data for the web conference.

The login data for the sessions are provided daily.

In order to allow all conference participants access to the posters, we ask you to upload your poster by login on the conference homepage and clicking on the button "My Submission" in the upper right corner of the conference homepage. Then select the submission to which you want to upload the poster and upload the poster at the bottom of the page.

Furthermore we would like to ask all poster authors to prepare 4 PowerPoint slides to present your poster to the audience.
Please also include your contact details on the digital poster to allow participants to reach you with questions.

Please note that your poster will be pictured publically.

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Click on "My Submissions" in the upper right corner at the homepage.

Poster documents can be found by opening the respective abstract in the online programme.
If a poster document has already been uploaded for the abstract, it can then be opened and downloaded.

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Please use for this the Q&A (F&A) button!

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Back to overview

Lecture

In the curl: Interface-mediated formation of polymer/mineral microscrolls

Wednesday (18.03.2020)
09:50 - 10:10

The formation of curled architectures is a wide-spread phenomenon in biogenic materials, most prominently observed in the plant kingdom. As a common principle, bending, curling and coiling of film structures are based on a bilayer or gradient configuration/construction, such that heterogeneities with respect to composition or structure give rise to a non-uniform mechanical response of the material to external stimuli such as drying/swelling, heating or an electrochemical potential. The pronounced internal stress resulting from a misfit between the different layers of the film is ultimately released by bending, which can lead to complex folding patterns. While coiling mechanisms in organic matter are intensely studied, reports on self-rolling in inorganic systems remain extremely scarce due to the high curvature and bending strain which have to be accommodated.

 

We here explore a bio-inspired approach, in which a cobalt(II) hydroxide carbonate precursor with layered crystallographic structure is precipitated in the presence of synthetic polyelectrolytes, acting as mimics of the soluble structure-directing matrix associated with biological mineralization processes. We demonstrate that extended mineral sheets with µm-thickness can be formed at the air-solution interface when precipitation occurs via slow gas diffusion. Intriguingly, the film fragments isolated after drying characteristically show bent and even curled morphologies. In the presence of polymer additives this strain-induced spiralling effect is substantially more pronounced such that micro scrolls composed of a polymer/mineral hybrid material are obtained. This remarkable observation inspired us to systematically investigate film formation and curling behavior in interface-grown basic cobalt carbonates depending on the functionalization of the polymer additive as well as the interface geometry and composition.

 

Calcination then leads to a pseudomorphic transformation of the precursors into the functional cobalt(II,III) oxide phase, which finds applications in a wide range of technological fields, including gas sensing and clean energy conversion, where nanostructured Co3O4 may provide a cost-efficient alternative to Pt- and Ir-based catalysts for electrocatalytic water-splitting. Therefore, our method endows us with the possibility to generate compact microelectrodes with spiral morphology and mesoscale channels promoting the transport of reagents and products.

Speaker:
Prof. Dr. Anna Schenk
University of Bayreuth
Additional Authors:
  • Viktoria Gruen
    University of Bayreuth