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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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2005kongying(½ð±Ò+1,VIP+0):544ÔõôËãµÄ°¡£¬ÎÒ²»»áËã 9-11 08:55
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an ethanolic solution (0.527M) of hexamethonium dihydroxide (HM(OH)2, 79.63 g, 42 mmol) c=n/v ȱÉÙ±äÁ¿£¬²»ÄÜÇó³öÒÒ´¼µÄÁ¿ ÔÚ´Ë£¬ÎÒ²ÂÓÐÁ½ÖÖ¿ÉÄÜ: 1) 0.527MÖÐMΪСдm£¬×÷ÕßÊÖÎó 2) ×÷Õß¼ÓÈ붨Á¿ÒÒ´¼ºó£¬Á¿µÃÌå»ý£¬ÇóµÄc |

3Â¥2009-09-11 08:58:12
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