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Synthesis of Mesoporous Zirconia Templated by Block Copolymer-Lysozyme Conjugate in Aqueous Media

TitleSynthesis of Mesoporous Zirconia Templated by Block Copolymer-Lysozyme Conjugate in Aqueous Media
Publication TypeJournal Article
Year of Publication2014
AuthorsGe, QW, Liu, XP, Parada, G, Mallapragada, SK, Akinc, M
JournalScience of Advanced Materials
Date Published10
Type of ArticleArticle
ISBN Number1947-2935
Accession NumberWOS:000345062900003
KeywordsBlock Copolymer, crystallization, high-surface-area, hydrous zirconia, mesoporous, morphology, nanocrystalline zirconia, nanoparticles, powder, precipitating agent, process parameters, sulfated zirconia, synthesis, Templation, Zirconia, zro2

A high surface area mesoporous zirconia/polymer nanocomposite was obtained using a block copolymer-lysozyme conjugate template and applying aqueous sol-gel method. The effects of several parameters, such as pH, zirconyl ion concentration, and calcination temperature on the structure and morphology of the resulting mesoporous zirconia were studied. Samples were characterized by X-ray diffraction (XRD), nitrogen sorption, and transmission electron microscopy (TEM). The results showed that tetragonal zirconia started to crystallize from amorphous precipitate above 300 degrees C, became fully crystalline above 500 degrees C, grew larger with higher temperatures, and a monoclinic phase formed above 900 degrees C. It was also found that a more dilute precursor solution led to more thermally stable and smaller particles with higher surface area. Likewise, higher pH (e. g., pH = 10) facilitated obtainment of higher surface area, thermally stable tetragonal zirconia with smaller particle sizes compared to samples precipitated at lower pH (e.g., pH = 4, 6, and 8). The aging at pH = 4 formed ill-defined gels rather than distinct particles. The surface area of the synthesized zirconia increased with calcination temperature up to 500 degrees C, reaching a maximum with a specific surface area of 348 m(2)/g using 0.08 mol/L [ZrO2+] and precipitating at pH = 10 before decreasing at higher temperatures.

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