INORGANIC / ORGANIC /POLYMERIC NANOCOMPOSITES

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INORGANIC / ORGANIC /POLYMERIC NANOCOMPOSITES 한양대 공업화학과 무기소재연구실 하 회 진 Inorganic Material Lab.

NANOCOMPOSITES TYPES OF NANOCOMPOSITE Inorganic Material Lab. Types Examples Low temperature sol-gel derived nanocomposites Mullite/SiO2; Al2O3/SiO2; SiO2/MgO ... Structural ceramic nanocomposites Al2O3/SiC; Si3N4/SiC ... Glass ceramic: glass/metal nanocomposites Photosensitive glasses Electroceramic nanocomposites Co/Cr Nanocomposites films nanocomposites Lead zirconate titanate (PZT)/nickel Entrapment-type Zeolite/metallic or organic complex Layered nanocomposites Pillared clays Metal/ceramic nanocomposites Fe Cr/Al2O3; Ni/Al2O3 Organoceramic nanocomposites Polymeric matrix/PbTiO3 Inorganic Material Lab.

NANOCOMPOSITES CONTENTS Inorganic Material Lab.  Nanoparticles by ultrasound - Molybdenum oxide-, molybdenum carbide-silica & zinc sulfide-silica  Pillared layered nanocomposites - Vanadium pentoxide doped aluminium oxide pillared clays (VAPCs) & p-toluenesulfonic acid doped aluminium oxide pillared clays (TSPCs)  Encapsulation nanoparticles by two-step process - Silica-magnetite/maghemite  Nanoclusters in block copolymer films (nanoreactor) - NORCOOH method, NORCOONa method, ring-opening metathesis polymerization (ROMP)  Molecular imprinting - Surface molecular imprinted polymer Inorganic Material Lab.

Ultrasonic Method - Nanoparticle 1 N. A. Dhas and A. Gedanken, Chem. Mater., 1997, 9, 3144 N. A. Dhas, A. Zaban, and A. Gedanken, Chem. Mater., 1999, 11, 806 Sonochemical synthesis System MOS composite 2Mo(CO)6 + 17/2 O2 → Mo2O5(s) + 2CO2(g) Mo2O5 + SiO2 → Mo2O5-SiO2 --------------------------------- 2Mo(CO)6 + SiO2 + 17/2 O2 → Mo2O5-SiO2(s) + 12CO2(g) MCS composite 2Mo(CO)6 → 2Mo(s) + 12CO(g) 2CO → C(s) + CO2(g) 2Mo + C → Mo2C(s) Mo2C + SiO2 → Mo2C-SiO2(s) ------------------------------- 2Mo(CO)6 + SiO2 → Mo2C-SiO2(s) + CO2(g) + 10CO(g) MOS(Molybdenum Oxide-Silica) Sonication for 3h, Mo(CO)6, silica in decane under ambient air MCS(Molybdenum Carbide-Silica) Sonication for 3h, Mo(CO)6, silica in decane under argon - Decomposition of the precursor into the required coating phase - Breaking of the strained siloxane link of the silica - Colliding with each other and depositing Inorganic Material Lab.

Ultrasonic Method - Nanoparticle 2 System ZnS Formation H2O ))))) H + OH 2H + RS → H2S + R (RS = thioacetamide) H2S + Zn(Ac)2 → ZnS + 2AcH ZSS (ZnS-SiO2) Sonication for 3h, Zn(ac)6, SiO2, TA(thioacetamide, MeCSNH2) in water under ambient air Sonochemistry Formation, growth, & Implosive collapse of bubbles in liq. → hot spots (~5000K, 1800 atm, cooling rates 108 K/s) Inorganic Material Lab.

Nanocomposites based on pillared clays J. Wang, J. Merino, P. Aranda, J.-C. Galvan and E. R.-Hitzky, J. Mater. Chem., 1999, 9, 161 Pillared clays ADVANTAGES VAPCs easily prepared, not expensive, easily separated and recovered after rexn., good thermal stability TSPCs excellent catalytic activity and good selectivity V2O5 or p-toluenesulfonic acid with oxidant or strong acid character Porous materials REACTIVITIES Oxidation (alcohol→carbonyl) : benzyl alcohol to benzaldehyde Synthesis of methyl tert-butyl ether (MTBE) and bisphenol A Inorganic Material Lab.