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lda2370320金虫 (著名写手)
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[求助]
二氧化硅表面用巯丙基三甲氧基硅烷改性时的注意事项 已有1人参与
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大家好，最近我刚接触这一块，不了解情况，请教下大家关于这块的问题，看到一篇文献上说道：75ml的巯丙基三甲氧基硅烷和10g的纳米二氧化硅时，嫁接效率较高，达到16%左右。想请问，纳米二氧化硅使用分散剂分散前要在烘箱里干燥处理么？这样做的目的是什么？另外，是不是干燥完不等温度降下来就马上加加甲苯分散？我下午尝试了，从100℃烘箱里烘了16h，拿出来直接加了甲苯，观察到体系成了凝胶状，超声分散也不起作用，请问有做这一块的么？另外，附加一下，文献上的实验步骤。谢谢大家了。 2.2. Surface modification of nanosilica with MPTMS 10 g of nanosilica were kept in a vacuum chamber for 24 h at 100 C, and then dispersed in 150 mL anhydrous toluene under mechanical stirring and ultrasonic dispersing for 30 min. The mixture was stirred at 300 rpm for a further 1 h, and then dropped into another prepared mixture consisting of 10 mL water, 10 mL anhydrous ethanol, 2 mL formic acid (as pH adjuster) and different levels (25, 50, 75, 100 and 125 mL) of MPTMS under vigorously stirring. After continuously stirring for 4 h at 50 C, the obtained suspension was separated by centrifugation. After drying at 90 C under vacuum, the mixture was extracted using Soxhlet extractor for 12 h using toluene. Finally, the modified nanosilica was dried at 90 C under vacuum condition for 12 h. |
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5楼2018-10-14 15:22:30
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木虫之王 (文坛精英)
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2楼2018-08-30 08:32:39
lda2370320
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3楼2018-08-30 13:52:21
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4楼2018-08-30 22:16:47