Carbon nanotubes prepared in situ in a cellular ceramic by the gelcasting-foam method |
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| Affiliation: | 1. D.I.E.T, Ganguru, Vijayawada 521139, India;2. PNC&VIJAI Institute of Engineering & Technology, Guntur 522529, India;1. Programa de Pós-Graduação em Engenharia de Minas, Metalurgica e de Materiais, PPGE3M, Universidade Federal do Rio Grande do Sul-UFRGS, Porto Alegre, RS 90035-190, Brazil;2. Escola de Ciências, Pontifícia Universidade Católica do Rio Grande do Sul-PUCRS, Porto Alegre, RS 90610-900, Brazil;3. Ciências Tecnológicas, Universidade Franciscana - UFN. Rua dos Andradas 1614, Santa Maria, RS 97010-032, Brazil;4. Programa de Pós-Graduação em Engenharia de Produção e Transporte, PPGEP, Universidade Federal do Rio Grande do Sul-UFRGS, Porto Alegre, RS 90035-190, Brazil |
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| Abstract: | The synthesis of carbon nanotubes from an oxide solid solution foam is reported for the first time. A foam of Mg0.9Co0.1Al2O4 solid solution is prepared by the gelcasting-foam method using notably mono- and di-functional acrylate monomers. Using a surfactant in the alkylpolyglucoside family allows to prevent structure changes in the foam before the onset of polymerisation. The wet ceramic foam is dried in air, producing a foam with an open porosity. Total porosity is equal to about 98% and the diameter of the pores is in the range 25–300 μm, about 90% being smaller than 200 μm. The Mg0.9Co0.1Al2O4 foam is reduced in H2–CH4 atmosphere, giving rise to a CNTs–Co–MgAl2O4 composite foam. Using the foam instead of the corresponding powder allows a four-fold increase in the production of carbon nanotubes, more than 95% of which have only 1 (70%) or 2 walls. |
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