한양대 공업화학과무기소재연구실

하 회 진

INORGANIC / ORGANIC/POLYMERIC

NANOCOMPOSITES

INORGANIC / ORGANIC/POLYMERIC

NANOCOMPOSITES

Inorganic Material Lab.Inorganic Material Lab.

Inorganic Material Lab.Inorganic Material Lab.

TYPES OF NANOCOMPOSITE

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.Inorganic Material Lab.

CONTENTS

Nanoparticles by ultrasound - Molybdenum oxide-, molybdenum carbide-silica & zinc sulfide-silica

Pillared layered nanocomposites - Vanadium pentoxide doped aluminium oxide pillared clays (VAPCs) & p-toluenesu

lfonic 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

Sonochemical synthesis

SystemMOS 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

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

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

N. A. Dhas and A. Gedanken, Chem. Mater., 1997, 9, 3144 N. A. Dhas, A. Zaban, and A. Gedanken, Chem. Mater., 1999, 11, 806

Inorganic Material Lab.Inorganic Material Lab.

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 waterunder ambient air

ZSS (ZnS-SiO2)Sonication for 3h, Zn(ac)6, SiO2,TA(thioacetamide, MeCSNH2) in waterunder ambient air

Inorganic Material Lab.Inorganic Material Lab.

Sonochemistry

Formation, growth, & Implosive collapse of bubbles in liq.→ hot spots (~5000K, 18

00 atm, cooling rates 108 K/s)

REACTIVITIES

Oxidation (alcohol→carbonyl) : benzyl alcohol to benzaldehyde

Synthesis of methyl tert-butyl ether (MTBE) and bisphenol A

with oxidantor strong acid

character

J. Wang, J. Merino, P. Aranda, J.-C. Galvan and E. R.-Hitzky, J. Mater. Chem., 1999, 9, 161

V2O5 orp-toluenesulfonic acid

Pillaredclays

Porousmaterials

ADVANTAGES

VAPCs easily prepared, not expensive, easily separated and recovered after rexn., good thermal stabilityTSPCs excellent catalytic activity and good selectivity

Inorganic Material Lab.Inorganic Material Lab.