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Aqueous Route Synthesis of Mesoporous ZrO 2 by Agarose Templation
Author(s) -
Ma Xing,
Klosterman Luke,
Hu YanYan,
Liu Xunpei,
SchmidtRohr Klaus,
Mallapragada Surya,
Akinc Mufit
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05417.x
Subject(s) - cubic zirconia , materials science , agarose , mesoporous material , specific surface area , fourier transform infrared spectroscopy , zirconium , chemical engineering , aqueous solution , scanning electron microscope , nuclear chemistry , chemistry , chromatography , organic chemistry , ceramic , catalysis , composite material , engineering , metallurgy
Mesoporous zirconia with high surface area has been synthesized using self‐assembling agarose gel as a template. Agarose gel was formed in the presence of aqueous zirconyl nitrate solutions followed by precipitation of zirconium (hydr)oxide in the gel framework. A porous zirconia structure is obtained by pyrolysis of agarose. Fourier transform infrared spectroscopy is employed to assess the agarose‐zirconia precursor interaction. Changes in the C – O absorption bands indicate zirconium association with the OH groups of the agarose. Solid state 13 C NMR studies of the nanocomposite showed a shift in intensity from 70 to 75 ppm indicating conversion of ~7% of C – O – H to C – O – Zr . Scanning electron microscopy reveals that both agarose/zirconia nanocomposite and zirconia have similar morphological features as that of pure agarose gel confirming agarose templation. Phase transformation of zirconia from amorphous to tetragonal between 300°C and 500°C, and gradually into monoclinic phase up to 900°C is observed using X ‐ray powder diffraction. Specific surface area and pore size distribution are determined using nitrogen adsorption, employing BET and Barrett–Joyner–Halenda methods, respectively. The specific surface area of porous zirconia after heat treatment at 500°C was determined to be 86 m 2 /g, which reduced with increasing temperature to 13 m 2 /g above 900°C. Transmission electron microscopy confirmed the hierarchical structure of porous zirconia.