中孔徑分子篩SBA-15的合成與型態學之探討

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中孔徑分子篩SBA-15的合成與型態學之探討

Synthesis and morphology of mesoporous sieve SBA-15 at low concentration

鄭旭軒 , Masters　　Advisor：鄭吉豐　　

繁體中文

SBA-15 ；型態學；中孔徑分子篩；低濃度酸； low acid concentration ； morphology ； SBA-15 ； mesoporous sieve

Abstract │ Reference (50) │ Times Cited (6) │ Altmetrics

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Mesoporous sieves SBA-15 could be synthesized at [H+] as low as 0.005 M. SBA-15 can be prepared at room temperature for 3 days and 90 ℃ for 1 day. The recipe of preparing SBA-15 is TEOS：P123：H2O ＝ 5~ 18：0.6 ~ 3.5：  at 0.1 to 0.005 M of [HCl] where good quality of SBA-15 can be obtained at the ratio of TEOS / P123 between 2 and 3.
Adequate proton concentration is needed to govern the interface between surfactant and silicate to obtain SBA-15 because amorphous would be obtained at pH ≧ 3  [SOH＋IO] is the interface interaction of formation in stead of  [SOH＋X－IO] proposed by Zhou et. al. because no chlorine ion can be observed in the product prepared in the aqueous solution of high and low [HCl].
Here, we proved the kinetics equation of mesoporous formation from the proposed mechanism. It is known, when SBA-15 was synthesized at low acid concentration, the rate constant versus the kinetic equation is allow first order. 
 Morphology of SBA-15 was gradually changed from long rod to curved rope-like disconnected-donut, donut, and ball with lowering acid concentration. The morphology of mesoporous SBA-15 is crucially dependent on the local curvature energy that is present at the interface of the inorganic silica and amphiphilic block copolymer species.

Reference ( 50 ) 〈TOP〉

1.McBain, J. W., The Sorption of Gases and Vapours by Solids, Rutledge and Sons, London, ch. 5, 1932.
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6.Behrens, P.; Stucky, G. D. Angew. Chem. Int. Ed. Engl. 1993, 32, 696.
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13.Lin, Y. C.; Chen, S. H.; Itri, R. J. Phys. : Condens. Mater. 1996, 8, 12169
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15.Zuna, R. Colloids Surf. 1997, 27, 123
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16.Chen, C.; Li, H.; Daris, M. E. Microporous Mater. 1993, 2, 17.
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