Tübingen Science Bridge - Connecting Brazil Germany

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Tübingen Science Bridge - Connecting Brazil Germany

“From nature to organic (bio)electronics: melanin-inspired materials”

By Brasilien-Zentrum der Universität Tübingen

Date and time

Wednesday, May 4, 2022 · 7:30 - 9:15am PDT

Location

Online

About this event

***Deutsche Version unten*** | *** Versão em português abaixo***

Seeking for internationalization of Science and Research and new impulses for cooperation between the University of Tübingen and partner universities in Brazil, Baden-Württembergisches Brasilien-Zentrum at the Universität Tübingen, launches the Program Tübingen Science Bridge - Connecting Brazil Germany, starting April, 2022. The program's goal is to promote and expand science, in addition intensify research cooperation through a sequence of lectures, online.

Scientists from several partner institutions will present their latest research data, promoting an integrated and constructive environment for scientific interaction and also contributing global knowledge.

The second webinar, which takes place on May 4 at 11:30 am BRT (04:30 pm MEZ), will focus on the area of Physic and has the participation of Prof. Dr. Carlos Frederico Graeff, at the São Paulo State University (UNESP), School of Sciences, Department of Physics. He will put on the agenda the theme “From nature to organic (bio)electronics: melanin-inspired materials”.

The webinar will be held in English on the ZOOM platform in order to allow discussion and interaction.

Lecture Briefing: Melanin is a generic term evoked for a broad class of indole/quinone-based natural pigment, mainly known due to its primary role in photoprotection. Besides, throughout the last couple of decades, synthetic melanin and melanin-like materials garner a lot of attention as a soft biocompatible functional material for bioelectronic and optoelectronic material due to their water-dependent conductivity and excellent biocompatibility (1). In the earlier days, the limited solubility and the low electronic conductivity of this class of compounds have hindered their progression in organic electronics and bioelectronics helms. Currently, such issues have been overcome by different strategies. In our research group, we combine organic and physical chemistry of condensed matter to develop different melanin derivatives and study their physicochemical properties. We have found years ago, that by synthesizing melanin in DMSO thin films could be produced (2). In this synthesis melanin are functionalized with sulfonated groups which makes this derivative soluble in DMSO. We have also synthesized melanin under oxygen pressure in water. Under this condition melanin is functionalized with CO2 and the synthesis time is accelerated. This CO2 rich melanin is closer to natural melanin and is less insoluble in water. The results obtained suggest that these new melanin derivatives are quite attractive alternatives for the manufacture of (bio) electronic devices. We have produced a pH sensor using an extended gate field effect transistor (EGFET) based on melanin thin films as active layer. The results revealed that EGFETs with melanin deposited on ITO and on gold substrates showed sensitivities ranging from 31.3 mV/pH to 48.9 mV/pH, depending on the melanin precursor solution and the substrate used for deposition. In another work (3) we demonstrate a highly sensitive pH sensor (62 mV pH−1 ± 7) over a pH range from 5 to 8, with high stability and superior performance when compared with a number of existing devices and making it suitable for physiological applications. Hence, the chemical tailoring procedures and physical-chemical properties of melanin-inspired material will be presented emphasizing their technological problems and applications.

*** Versão em português ***

Na busca da internacionalização da Ciência e Pesquisa, e de novos impulsos para a cooperação entre a Universidade de Tübingen e universidades parceiras do Brasil, o Brasilien-Zentrum de Baden-Württemberg lança, a partir de abril de 2022, o programa Tübingen Science Bridge - Connecting Brazil Germany. Além de aproximar e fortalecer o trabalho colaborativo por meio de uma sequência de palestras (on-line), a iniciativa tem como objetivo promover e expandir a ciência.

Cientistas de diversas instituições parceiras apresentarão seus últimos dados de pesquisa. O segundo webinar, que acontece no dia 4 de maio às 11:30 am BRT (04:30 pm MEZ), terá como foco a área da Física e conta com a participação do Prof. Dr. Prof. Dr. Carlos Frederico Graeff, da Universidade Estadual Paulista (UNESP), School of Sciences, Department of Physics. Ele colocará em pauta a temática “From nature to organic (bio)electronics: melanin-inspired materials”.

O evento será realizado através da plataforma ZOOM, em inglês, para permitir a discussão e interacção entre os participantes.

***Deutsche Version ***

Das Baden-Württembergische Brasilien-Zentrum legt ein neues Programm auf, um der Zusammenarbeit zwischen der Universität Tübingen und ihren Partneruniversitäten in Brasilien neue Impulse zu geben. Das Programm Tübingen Science Bridge – Connecting Brazil Germany, das einen Beitrag zur Internationalisierung von Wissenschaft und Forschung leistet, startet im April.

In einer Online-Vortragsreihe präsentieren hochkarätige Wissenschaftler:innen der verschiedenen Partnerinstitutionen ihre neuesten Forschungsergebnisse und tragen damit zu einer gemeinsamen und konstruktiven Basis für die wissenschaftliche Zusammenarbeit bei.

Das zweite Webinar, das am 4. Mai um 04:30 pm MEZ (11:30 am BRT) stattfindet, befasst sich mit dem Bereich Physik und wird von Prof. Dr. Carlos Frederico Graeff, at the São Paulo State University (UNESP), School of Sciences, Department of Physics. Das Thema lautet „From nature to organic (bio)electronics: melanin-inspired materials”.

Die Veranstaltung findet auf Englisch über die Plattform ZOOM statt, um eine Diskussion und Interaktion zu ermöglichen.

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