Templated and Bioinspired Aqueous Phase Synthesis and Characterization of Mesoporous Zirconia

TitleTemplated and Bioinspired Aqueous Phase Synthesis and Characterization of Mesoporous Zirconia
Publication TypeJournal Article
Year of Publication2013
AuthorsLiu XP, Ge QW, Rawal A, Parada G, Schmidt-Rohr K, Akinc M, Mallapragada SK
Journal TitleScience of Advanced Materials
Volume5
Pages354-365
Date Published04
Type of ArticleArticle
ISBN Number1947-2935
Accession NumberWOS:000319176600007
KeywordsAqueous Media, bioinspired synthesis, biosynthesis, BLOCK-COPOLYMER, lysozyme, Mesoporous Zirconia, metal-oxides, nanocomposites, silica, stabilized zirconia, temperature, templating, THERMAL-STABILITY, TRANSFORMATION
Abstract

Mesoporous zirconia has attracted great attention from the research community due to its unique properties such as high surface area, uniform pore size distribution, and large pore volume. Self-assembled structures have been used as directing agents to synthesize mesoporous zirconia. Here, we investigate the use of self-assembling block copolymers conjugated to cationic biomolecules such as lysozyme, as well as self-assembling cationic block copolymers as templates for synthesis of mesoporous zirconia in completely aqueous media. We believe this is the first report for synthesis of mesoporous zirconia in completely aqueous media with biomolecules, thereby opening up opportunities for different mechanisms for controlling zirconia synthesis. TGA was used to determine the inorganic content of the nanocomposite. XRD, nitrogen adsorption, TEM, SEM, SANS, and solid state NMR were employed to characterize the structure and composition of the samples. The results showed that zirconia nanocrystals formed after calcination of the as-synthesized nanocomposite at 500 degrees C, and significant crystal growth was observed only after 900 degrees C calcination. The conjugate-templated zirconia showed a surface area of 174 m(2)/g after calcination at 500 degrees C, and retained its tetragonal structure even after calcining at 900 degrees C. The cationic pentablock copolymer-templated zirconia showed the highest surface area, 191 m(2)/g, after calcination at 500 degrees C, and also demonstrated improved thermal stability. This bioinspired method can be easily scaled up and potentially used for synthesis of other oxides.

URL<Go to ISI>://WOS:000319176600007
DOI10.1166/sam.2013.1465