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Seminario INMA-Junior: “Photoactive Pi-functional organic molecules in photovoltaic applications” y “Aqueous seeded raft polymerization for the preparation of self-assemblies containing nucleobase analogues”.- Miércoles 7 de junio

El próximo miércoles 7 de junio a las 12:00 h tendrá lugar el próximo Seminario INMA- Junior en la Sala de Grados, Edificio A, Facultad de Ciencias, Campus San Francisco.

Tras el seminario tendrá lugar un picoteo al que todos los asistentes podrán acudir.

Ponente 1: Raquel Royo

Título: PHOTOACTIVE π-FUNCTIONAL ORGANIC MOLECULES IN PHOTOVOLTAIC APPLICATIONS

Resumen de la charla:

π−conjugated systems attract great interest due to the large scope of their properties, useful for a wide range of applications. In particular, the optical and electronic properties of π-bridged compounds have fostered their study and integration into optoelectronic and electronic devices. Third-generation photovoltaics are able to produce high efficiency photon to electricity conversion devices at a cheaper and more suitable way in comparison with silicon devices.  In this seminar, I will focus on the design and synthesis of D-p-A (donor- p -acceptor) organic dyes as photoactive component in dye-sensitized solar cells (DSSCs). The photovoltaic behavior of three series of dyes based on a 4H-piranilidene donor have been studied, paying attention to the influence of the chemical structure on the efficiency.

Moreover, I will present a novel spiro-type molecule as a hole transport material (HTM). We investigated the Spiro-HTM effects on the performance of inverted PSCs (iPSCs) based on triple cation CsFAMA perovskite. This HTM compound allows the formation of very thin layers (<15 nm) which promotes hole mobility without the need for doping. In comparison with the PEDOT: PSS reference devices, the iPSC based on Spiro-HTM exhibit a higher VOC leading to a higher PCE.

Ponente 2: Miriam Abad

Título: AQUEOUS SEEDED RAFT POLYMERIZATION FOR THE PREPARATION OF SELF-ASSEMBLIES CONTAINING NUCLEOBASE ANALOGUES

Resumen de la charla:

Amphiphilic block copolymers can self-assemble in water leading to different structures with sizes at the nanoscale and potential uses in different fields, including the biomedical one. The majority of self-assembly methodologies are post-polymerization processes which consist of time-consuming multiple steps and provide highly diluted block copolymer dispersions. Over the past years, polymerization-induced self-assembly (PISA) has emerged as an attractive one-step alternative where self-assembly occurs during the polymerization, thus avoiding multiple processing or purification steps and also providing highly concentrated self-assembly dispersions with good colloidal stability. In this work, self-assemblies containing the nucleobase analogue 2,6-diacylaminopyridine (DAP) have been successfully prepared for the first time by aqueous seeded RAFT polymerization in high concentrations. For this purpose, a diblock copolymer containing poly(ethylene glycol) (PEG) and DAP polymethacrylate blocks was used as a macro-chain-transfer agent (PEG124-b-PDAP9-CTA) for the polymerization of 2-hydroxypropyl methacrylate (HPMA) in water. From the systematic variation of the degree of polymerization and solid concentration, a phase diagram has been generated that correlates both variables with the morphologies of this new system. Self-assemblies have been characterized by TEM and DLS, observing morphologies from low to high order (from spherical micelles to worms and to vesicles). In addition, H-bonding supramolecular functionalization of the DAP repeating units during aqueous seeded RAFT polymerization has been examined by functionalization with a cross-linker with four thymine groups. Finally, the loading and the subsequent release of Nile Red have been proven in both supramolecular cross-linked and non-cross-linked self-assemblies.

Se van a enviar certificados de asistencia al ciclo de Seminarios Junior del INMA por la asistencia a al menos dos de las sesiones del ciclo. Pedimos a los interesados que nos manden un email a cualquiera de los organizadores:

Beatriz Zornoza (bzornoza@unizar.es)

Gabriel Alfranca (alfrancagabriel@gmail.com)

Zsuzsa Baranyai (zsuzsabaranyai@unizar.es)

Cristina Momblona (cristinamomblona@unizar.es)

Marta Haro (mharo@unizar.es)

Alberto Concellón (aconcellon@unizar.es)

Jorge Pérez (jorgepb@unizar.es)

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