Inorganic Nanostructured Materials Gerasimos Armatas.

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Presentation transcript:

Inorganic Nanostructured Materials Gerasimos Armatas

Research activities Research activities focused on design and synthesis of nanostructured mesoporous materials and their applications, including: Nanoporous metal oxides using ‘soft’ or ‘hard’ templated (nanocasting) self-assembly approaches Periodically ordered mesoporous polyoxometalate- containing frameworks Nanostructured inorganic semiconductors Structural and chemical modification of nanocomposite structures Applications in heterogeneous catalysis, absorption, optoelectronics and gas separation

Hexagonal Mesoporous Zirconia-POM Nanocomposites c 103 m 2 /g D p =5 nm Substrate Conversion (%) TOF (h -1 ) Selectivity epoxide:alcohol:ketone cyclooctene :0:0 cyclohexene :43:10 methyl- cyclohexene :8:11 Styrene :0:95 methyl- styrene :61:0 Epoxidation of alkenes with H 2 O 2 catalyzed by 37wt% PMo 12 /ZrO 2 Other catalytic systems include mesoporous ZrO 2 /[SiW 12 O 40 ] 4-, ZrO 2 /[PW 12 O 40 ] 3-, Al 2 O 3 /[PW 12 O 40 ] 3-, TiO 2 /[W 10 O 32 ] 4- nanocomposites. G.S Armatas et el., J. Mater. Chem. 2010, 20, 8631; G.S.Armatas et el., J. Mater. Chem. 2011, 21, 2997

SBA-15 Cr(NO 3 ) 3 H 3 PMo 12 O 40 SBA-15 Cr 2 O 3 /HPMo 400 o C HF b Mesoporous Cr 2 O 3 -Phosphomolybdic acid Solid Solution Frameworks 63wt% HPMo/Cr 2 O 3 H 2 O 2, 50 o C Catalytic oxidation of 1-phenylethanol* *Conv. 87%, TOF=103 h -1, 5 min, CH 3 CN Other materials are mesoporous Co 3 O 4 /[PW 12 O 40 ] 3-, CeO 2 /MoO 3, CeO 2 /Bi 2 O 3. Armatas et el., Chem. Mater. 2010, 22, c. XPS

Mesoporous Germanium Semiconducting Frameworks (collaboration with Northwestern University, USA) Band gap Evolution with Wall Thickness in a Nanostructured Semiconductor G.S. Armatas, M.G. Kanatzidis, Nano Lett. 2010, 10, 3330

Collaborators Prof. M. Kanatzidis (NU) Prof. M. Louloudi (UoI) Prof. P. Pomonis (UoI) Prof. K. Triantafyllidis (AUTH) Prof. I. Lykakis (AUTH) Prof. M. Stratakis (UoC) Dr. P. Chupas (ANL) Funding