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FUNDAMENTALS                                           CH. 4 CONTROL OF NANOSTRUCTURE OF MATERIALS
                                                                 both the mesoscale and molecular scale even when
                                                                 this material is boiled in water for 8 h.
                                                                  Similar molecular-scale periodicity has been
                                                                 observed with biphenyl (–C H -C H –) [16], 1,3-
                                                                                           4
                                                                                         6
                                                                                                4
                                                                                              6
                                                                 benzene [23], and toluene.  Although a highly
                                                                 ordered mesostructure is formed with ethane and
                                                                 methane, which undergo weak interaction, a periodic
                                                                 structure does not develop on the pore walls. This
                                                                 indicates that strong interaction with the organic
                                                                 silane molecules plays a crucial role in the formation
                                                                 of the molecular-scale periodicity. A benzene-silica
                                                                 material with a lamellar mesostructure and a molec-
                                                                 ular-scale periodicity was also synthesized by con-
                                                                 trolling the synthesis conditions [24]. Crystallization
                                                                 of amorphous pore walls of mesoporous benzene-
                                                                 silica has also been performed as a post-treatment
                                                                 process [25].
                                                                  Silanol (Si-OH) or organic groups on the pore wall
                                                                 can be readily modified, and up to now, this method
                                                                 has been applied to introduce sulfone groups (-SO H)
                                                                                                         3
                                                                 and to solid acid catalysts [26–28].


                                                                                 References
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                  Figure 4.6.20                                      (2002).
                  TEM image of crystal-like mesoporous phenylene-silica.  [3] J.Y. Ying, C.P. Mehnet and M.S. Wong: Angew. Chem.
                                                                     Int. Ed., 38, 56–77 (1999).
                                                                 [4] A. Stein, B.J. Meldw and R.C. Schroden: Adv. Mater.,
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                                                                     (2001).
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                                                                 [11] T. Aefa, M.J. MacLachlan, N. Coombs and G.A. Ozin:
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                                                                 [12] K.  Nakajima, D.L. Lu, J.N. Kondo, I.  Tomita,
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                                                                 [14] S. Inagaki, S. Guan,  T. Ohsuan and O.  Terasaki:
                  Figure 4.6.21                                      Nature, 416, 304–307 (2002).
                  Simulation model of crystal-like mesoporous    [15] Y. Goto, S. Inagaki: Chem. Commun.[J], 2410–2411
                  phenylene-silica.                                  (2002).

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