Luminescent composites bsed on bacterial celullose and lanthanides

• Autor(a) principal: Perez de Albeniz, Naia Gandiaga
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/12602
• topic: Química; Materiais luminescentes; Lantanídeos

The development of innovative bio-based materials has gained considerable attention during the last decades because of the increasing society awareness regarding environmental issues and sustainable development. Cellulose is the most abundant natural polymer and therefore represents one of the most relevant raw materials from renewable resources. For example, the combination of natural polymers, as cellulose, with inorganic compounds with specific properties is a quite interesting and versatile strategy for the design of novel functional materials. In this context, the aim of this work was to prepare and characterize novel luminescent organic-inorganic hybrid films obtained by combination of cellulose acetate (prepared by almost complete acetylation bacterial cellulose nanofibrils) and a lanthanide ß-diketone complex (Tb(acac)3). All the obtained films were very homogeneous and transparent and displayed improved thermal and mechanical properties, in comparison with the undoped cellulose acetate films. The photoluminescence analysis confirmed the high ability of lanthanides to provide luminescence properties to different materials. Finally, the addition of partially acetylated bacterial cellulose nanofibrils to the films improved the mechanical properties without affecting the transparency and luminescence in a great extent.