resumo
Lead zirconate titanate (PZT, 53/47) fibers are prepared by sol-gel method using organic acids - acrylic and methacrylic acid - to modify the precursors. The macroscopic properties, molecular structure, crystallization behaviour and microstructure of the fibers are investigated as a function of the content and type of acid. Organic acids produce long gel and ceramic fibers, due to the beneficial effect of the long polymeric chains that are generated in the precursor gel. However the longest, strongest, densest and with the highest homogeneity fibers are obtained when acrylic acid is used. The linear shape of the molecular structure of acrylic acid, together with a lower content of organic species to be released, is favourable to the preparation of round and crack free PZT fibers, when acrylic acid is used. (c) 2011 Published by Elsevier Ltd.
palavras-chave
ACETIC-ACID; PZT FIBERS; PRECURSOR; COMPOSITES; H-1
categoria
Materials Science
autores
Zhang, M; Vilarinho, PM; Salvado, IMM; Silva, A
nossos autores
Isabel Margarida Miranda Salvado
Professor associado
Paula Maria Lousada Silveirinha Vilarinho
Vice-DiretorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
The authors acknowledge the financial support from FEDER, QREN, COMPETE, FCT and CICECO. One of the authors (ZM) acknowledges the financial support of the Foundation for Science and Technology of Portugal (FCT) under the postdoctoral Grant No. SFRH/BPD/3589/2000 and the National Science Foundation of China under the Grant Nos. 50402022, 50672006.