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Séminaire Chimie ED459

Morphosyntheses of layered double hydroxides

Prof. Makoto Ogawa (Graduate School of Science & Engineering / Department of Earth Sciences, Waseda University, Tokyo, Japan)

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Le Lundi 30 Novembre 2009 à 16h00
ENSCM site La Galéra, salle de conférences de l’équipe MACS/ICGM
Dernière minute : conférence annulée

Layered double hydroxides (LDHs ; the general formula of which is : M2+1–xM3+x(OH)2 (An)x/nmH2O) are a class of layered materials consisting of positively charged brucite-like layers and the charge compensating interlayer exchangeable anions. The mechanism of the LDH formation and their structures, characteristics and intercalation chemistry have been investigated so far. The wide range of application of LDHs and their intercalates motivates researchers to develop a simple, economically viable synthetic method.

We have developed a simple synthetic method using magnesium hydroxide and aluminum hydroxide (brucite and gibbsite) as the inorganic sources for the synthesis of the Mg-Al LDH-deoxycholate intercalation compounds,[1] where aqueous suspension of magnesium hydroxide, aluminium hydroxide and deoxycholate was hydrothermally treated in a closed vessel. The hydrothermal LDH synthesis from aqueous suspension of magnesium hydroxide and aluminum hydroxide was applied to the synthesis of the sulfide containing Mg-Al LDHs using thioacetoamide as the sulfide source.[2] The method is an easy, environmentally friendly method potentially applicable to the preparation of a series of LDH with different structures and properties. Later on, similar LDH syntheses were reported by the hydrothermal treatment of gibbsite and MgO or Al2O3 and MgO.[3] Here, we report the synthesis of Zn-Al LDHs containing benzenesulfonate by the hydrothermal reactions of aqueous suspension of zinc oxide and gibbsite.

Preparation of LDHs by hydrothermal urea method will also be reported.[4] The well-shaped hexagonal platy particle of hydrotalcite obtained by the hydrothermal urea method was used as template to control the nanoporous silica particle morphology.[5]

References

1. M. Ogawa, S. Asai, Chem. Mater. 2000, 12, 3253.
2. M. Ogawa, F. Saito, Chem. Lett. 2004, 1030.
3. (a) S.P. Newman, W. Jones, P. O’Corner, D.N. Stamires, J. Mater. Chem. 2002, 12, 153 ; (b) Z.P. Xu, G.Q. Lu, Chem. Mater. 2005, 17, 1055.
4. (a) M. Ogawa, H. Kaiho, Langmuir 2002, 18, 4240 ; (b) M. Kayano, M. Ogawa, Clays Clay Miner. 2006, 54, 382 ; (c) M. Kayano, M. Ogawa, Bull. Chem. Soc. Jpn. 2006, 79, 1988 ; (d) Y. Arai, M. Ogawa, Appl. Clay Sci. 2009, 42, 601.
5. N. Shimura, M. Ogawa, J. Colloid Interface Sci. 2007, 312, 311.

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