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The synthesis gel was prepared by hydrolyzing tetraethyl
orthosilicate (31.20 g, 150 mmol) in an ethanolic solution (0.527M)
of hexamethonium dihydroxide (HM(OH)2, 79.63 g, 42 mmol) with
continuous stirring until all the ethanol had completely evaporated.
Then, a 49 wt% aqueous solution of HF (3.495 g, 84 mmol) was
introduced and water was added to give a water/silica ratio of 7. The final gel composition had the following molar composition:
SiO2 : 0:28HM(OH)2 : 0:56HF : 7H2O
ÎÄÏ×Àï ethanolic solution (0.527M)µ½µ×Òª¼Ó¶àÉÙÒÒ´¼°¡£¿
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2Â¥2009-09-11 08:29:20
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2005kongying(½ð±Ò+2,VIP+0):ллŶ£¬ÎÒÒ²Ò»Ö±ÄÉÃÆÄØ 9-11 09:04
an ethanolic solution (0.527M)
of hexamethonium dihydroxide (HM(OH)2, 79.63 g, 42 mmol)
c=n/v  È±ÉÙ±äÁ¿£¬²»ÄÜÇó³öÒÒ´¼µÄÁ¿
ÔÚ´Ë£¬ÎÒ²ÂÓÐÁ½ÖÖ¿ÉÄÜ:
1)  0.527MÖÐMΪСдm£¬×÷ÕßÊÖÎó
2)  ×÷Õß¼ÓÈ붨Á¿ÒÒ´¼ºó£¬Á¿µÃÌå»ý£¬ÇóµÄc
СǮ
3Â¥2009-09-11 08:58:12
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