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Sol-gel Processing 1. Principles ??????? (organometallic precursors, ex : alkoxide) ? ? ?? ???? (hydrolysis)?? 1¦Ìm ?? ??? ??? ???? ???? ?? ?(sol)? ?? ??, ???? (poly- condensation)? ??? ? ???? 3??? ???? (3-D network)? ??? ?(gel) ??? ??? ??? ???? ? ?, ???, ???? ?? 2. ?? ? ?? 1) high purity 2) high homogeneity 3) low processing temperatures 4) preparing multi-component system 5) ??? ???? 6) ??? ?? 3. Sol-gel ??? ???? ?? 4. ?? ?? ?? 1) pH 2) solution composition 3) temperature
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????? 2007.06.27 ????? 2007.06
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    Sol-gel Processing
    1. Principles
    ??????? (organometallic precursors, ex : alkoxide) ?
    ? ?? ???? (hydrolysis)?? 1¦Ìm ?? ??? ???
    ???? ???? ?? ?(sol)? ?? ??, ???? (poly-
    condensation)? ??? ? ???? 3??? ???? (3-D
    network)? ??? ?(gel) ??? ??? ??? ???? ?
    ?, ???, ???? ??


    2. ?? ? ??
    1) high purity
    2) high homogeneity
    3) low processing temperatures
    4) preparing multi-component system
    5) ??? ????
    6) ??? ??



    3. Sol-gel ??? ???? ??



    4. ?? ?? ??
    1) pH
    2) solution composition
    3) temperature

    ??

    Sol-gel Processing
    1. Principles
    2. ?? ? ??
    3. Sol-gel ??? ???? ??
    4. ?? ?? ??
    5. Examples
    6. 3?? ????? ?? : precursor? ??? ??
    6-1. Silica Sol-Gel processing
    6-2 Metal Alkoxide Method
    6-3. Pechini Processing

    ????

    Sol-gel Processing
    1. Principles
    ??????? (organometallic precursors, ex : alkoxide) ?
    ? ?? ???? (hydrolysis)?? 1¦Ìm ?? ??? ???
    ???? ???? ?? ?(sol)? ?? ??, ???? (poly-
    condensation)? ??? ? ???? 3??? ???? (3-D
    network)? ??? ?(gel) ??? ??? ??? ???? ?
    ?, ???, ???? ??
    2. ?? ? ??
    1) high purity
    2) high homogeneity
    3) low processing temperatures
    4) preparing multi-component system
    5) ??? ????
    6) ??? ??
    3. Sol-gel ??? ???? ??
    4. ?? ?? ??
    1) pH
    2) solution composition
    3) temperature
    5. Examples
    6. 3?? ????? ?? : precursor? ??? ??
    1) silica¡¤sol-gel processing
    2) metal alkoxide processing
    3) Pechini-type processing
    6-1. Silica Sol-Gel processing
    1) Step 1. : Hydrolysis and Polycondensation
    - Precursor : liq. alkoxide, Si(OR)4 R = CH3, C2H5, C3H7
    - Reactant : Water
    - Catalyst : acid or ammonia
    - Hydrolysis reaction
    - Condensation reaction : forming ¡ÔSiOSi¡Ô bonds
    - Polycondensation reaction
    : linkage of additional hydrated silica tetrahedra(Si(OH)4)
    : forming a SiO2 network
    : the water remains in the pores of the network
    - Results : formation of the spherical silica particles as
    colloidal particles or a sol.

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