9 documents found, page 1 of 1
Novel benzothiazole Boc-Phe-Phe-Bz derivative dipeptide forming fluorescent and...
Baptista, Rosa Maria Ferreira; Santos, Daniela; Cunha, N. F.; Castro, Maria Cidália Rodrigues; Rodrigues, Pedro António Veiga; Machado, A. V.This work explores the self-assembly and optical properties of a novel chiral, aromatic-rich Boc-Phe-Phe dipeptide derivative functionalized with a benzothiazole bicyclic ring that forms supramolecular structures. Leveraging the well-known self-assembling capabilities of diphenylalanine dipeptides, this modified derivative introduces a heterocyclic benzothiazole unit that significantly enhances the fluorescence...
Bioinspired cyclic dipeptide functionalized nanofibers for thermal sensing and ...
Santos, Daniela; Baptista, Rosa Maria Ferreira; Handa, Adelino; Almeida, B. G.; Rodrigues, Pedro V.; Torres, Ana R.; Machado, A. V.; Belsley, M.Nanostructured dipeptide self-assemblies exhibiting quantum confinement are of great interest due to their potential applications in the field of materials science as optoelectronic materials for energy harvesting devices. Cyclic dipeptides are an emerging outstanding group of ring-shaped dipeptides, which, because of multiple interactions, self-assemble in supramolecular structures with different morphologies ...
A polymorph of dipeptide halide glycyl-L-alanine hydroiodide monohydrate: cryst...
Baptista, Rosa Maria Ferreira; Gomes, Clara S. B.; Silva, Bruna Machado; Oliveira, joão; Almeida, B. G.; Castro, Maria Cidália RodriguesA polymorph of glycyl-L-alanine HI.H2O is synthesized from chiral cyclo-glycyl-L-alanine dipeptide. The dipeptide is known to show molecular flexibility in different environments, which leads to polymorphism. The crystal structure of the glycyl-L-alanine HI.H2O polymorph is determined at room temperature and indicates that the space group is polar (P21), with two molecules per unit cell and unit cell parameters...
Electrospun microstructured biopolymer fibers containing the self-assembled Boc...
Handa, Adelino; Baptista, Rosa Maria Ferreira; Santos, Daniela; Silva, Bruna; Rodrigues, Ana Rita Oliveira; Oliveira, João; Almeida, B. G.Hybrid biomaterials were engineered using the electrospinning technique, incorporating the dipeptide Boc–L-phenylalanyl–L-isoleucine into microfibers composed of biocompatible polymers. The examination by scanning electron microscopy affirmed the morphology of the microfibers, exhibiting diameters ranging between 0.9 and 1.8 µm. The dipeptide self-assembles into spheres with a hydrodynamic size between 0.18 and...
Self-assembly of Boc-p-nitro-l-phenylalanyl-p-nitro-l-phenylalanine and Boc-l-p...
Baptista, Rosa Maria Ferreira; Lopes, Paulo Estevão Caldeira; Rodrigues, Ana Rita O.; Cerca, Nuno; Belsley, M.; de Matos Gomes, EtelvinaSelf-assembly of two N-tert-butoxycarbonyl (Boc) protected analogues of diphenylalanine dipeptide, Boc-p-nitro-l-phenylalanyl-p-nitro-l-phenylalanine and Boc-l-phenylalanyl-l-tyrosine, respectively, Boc-pNPhepNPhe and Boc-PheTyr, in 1,1,1,3,3,3-hexafluoro-2-propanol/ethanol(water) solvents and into electrospun fibers is studied. Uncommon dual self-assembly is found for Boc-pNPhepNPhe, with the formation of nano...
Lead-free MDABCO-NH4I3 perovskite crystals embedded in electrospun nanofibers
Baptista, Rosa Maria Ferreira; Moreira, Gonçalo; Silva, Bruna; Oliveira, João; Almeida, B. G.; Castro, Maria Cidália RodriguesIn this work, we introduce lead-free organic ferroelectric perovskite N-methyl-N′-diazabicyclo [2.2.2]octonium)–ammonium triiodide (MDABCO-NH4I3) nanocrystals embedded in three different polymer fibers fabricated by the electrospinning technique, as mechanical energy harvesters. Molecular ferroelectrics offer the advantage of structural diversity and tunability, easy fabrication, and mechanical flexibility. Organ...
High Piezoelectric Output Voltage from Blue Fluorescent N,N-Dimethyl-4-nitroani...
Baptista, Rosa Maria Ferreira; Silva, Bruna; Oliveira, João; Bayzi Isfahani, Vahideh; Almeida, Bernardo; Pereira, Mário R.; Cerca, Nuno; Castro, CidáliaN,N-dimethyl-4-nitroaniline is a piezoelectric organic superplastic and superelastic charge transfer molecular crystal that crystallizes in an acentric structure. Organic mechanical flexible crystals are of great importance as they stand between soft matter and inorganic crystals. Highly aligned poly-l-lactic acid polymer microfibers with embedded N,N-dimethyl-4-nitroaniline nanocrystals are fabricated using th...
Functionalized magnetic composite nano/ microfibres with highly oriented van de...
Isfahani, Vahideh Bayzi; Da Silva, João Filipe Horta Belo; Boddapati, Loukya; Rolo, Anabela G.; Baptista, Rosa Maria Ferreira; Deepak, Francis LeonardThis study reports on the synthesis of highly oriented chromium triiodide (CrI3) magnetic inclusions inside nano/microfibres with a polyethylene oxide matrix, prepared by the electrospinning technique. The structural, microstructural and spectroscopic analysis shows uniformly dispersed CrI3 nanosized inclusions inside the fibres, presenting a C2/m monoclinic structure at room temperature, where their c-axis is ...
Corantes azo para impressão a jacto de tinta com boa solidez à água
Baptista, Rosa Maria FerreiraO uso de impressoras a jacto de tinta e a elaboração de tintas especiais para a impressão em papel ou outras superfícies tem sido objecto de uma exaustiva investigação ao longo dos últimos anos. Corantes solúveis em água têm fornecido os componentes coloridos utilizados em algumas tintas, embora os pigmentos tenham encontrado também um grande crescimento. Contudo, do uso de pigmentos advêm muitos problemas, a m...