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liuchuanao

铜虫 (小有名气)

[求助] 核壳催化剂制备过程原理

求大神指导,小弟刚接触此方面还不是很了解,最近看文献,有如下一段:(!)((1)Preparation of Nickel Cores.
         A mixture of Ni(acac) 2 (0.77g, 3.0 mmol) and TOP (4.0 mL, 9.0 mmol) in oleylamine (20mL) was slowly heated from room temperature to 493 K for 15 min under an inert atmosphere and was allowed to stir at 493 K for 45 min. After the reaction, the resulting black mixture was cooled at room temperature, and the particles were precipitated by adding ethanol (40 mL) and centrifuging at 10000 rpm for 20 min. Finally, the nickel nanoparticles were dispersed in cyclohexane.
其中加粗部分加入乙醇是起什么作用呀?
(2)Synthesis of Ni(3 nm)@SiO2 Yolk-Shell Nanocatalysts.
Cyclohexane (25 mL) was added into a mixture of igepal CO-630 (8.0 mL) and NH4OH aqueous solution (1.0 mL) and stirred for 10 min. The nickel particle dispersion in cyclohexane (25 mL, 60 mM with respect to the nickel precursor concentration) was added into the mixture and allowed to stir rapidly for 30 s. TMOS (1.0 mL) and C18TMS (1.0 mL) were added, and the mixture was stirred for 1 h at room temperature. The resulting Ni@SiO2 core -shell particles were precipitated by adding methanThe ethanol dispersion (30 mL) of the Ni@SiO2 core -shell particles (50 mM with respect to the nickel precursor concentration) was treated with hydrochloric acidol (10 mL), washed with ethanol thoroughly, and redispersed in ethanol. The ethanol dispersion (30 mL) of the Ni@SiO2 core -shell particles (50 mM with respect to the nickel precursor concentration) was treated with hydrochloric acid (10 mL, 0.45 M) at room temperature for 30 min. The product was collected by centrifugation at 10 000 rpm for 30 min and washed with ethanol thoroughly. After drying at room temperature, the powders were placed in the ceramic boat in a glass tube oven, heated at a ramping rate of 4 K/min to 773K, and calcined at 773 K for 2 h under a hydrogen flow of 200 cc/min. After calcination, the resulting powders were cooled to room tem-perature and immediately submerged into anhydrous ethanol (20 mL) under a hydrogen environment in order to prevent surface oxidation of the nickel cores.
其中加入盐酸的的作用是什么呀?
求大神帮忙呀,小弟万分感激!!!
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liuchuanao

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求助呀,小弟万分感谢!!!
2楼2013-09-06 08:09:38
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冰王子1

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感谢参与,应助指数 +1
jiangyun2: 金币-1, 应助指数-1, 这种回答就不要点应助了,警告一下~~ 2013-09-08 19:46:58
哥也不知道。。得点金币哈哈
3楼2013-09-08 18:37:59
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leedoubles

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missu001: 金币+1, 感谢交流 2013-09-09 10:16:50
醇可能是溶剂, 酸可能是用来调节PH值
4楼2013-09-09 10:14:27
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s091450

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jiangyun2: 金币+1, 谢谢回帖交流,欢迎常来~~ 2013-09-09 12:31:32
加入醇可以控制球形载体的分散情况  防止球形的聚一起
我的师兄做过   加入醇后 单个球形的可以分的很开
5楼2013-09-09 11:23:33
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ThxVV

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★ ★ ★ ★ ★ ★ ★ ★ ★
王晓萌: 金币+1, 谢谢分享,欢迎常来! 2013-11-12 13:25:49
liuchuanao: 金币+8, ★★★很有帮助 2013-11-13 09:53:52
这里你好好看一下 ,他做的是y-s不是c-s,c-s就是一般的核壳,y-k就像铃铛一样的核壳,里面一个小的核,外面一个壳,中间有空腔。c-s是core-shell,y-k是yolk-shell。这里Ni NPs和Ni@SiO2 C-S制备都能看得懂吧?加入盐酸的意思是刻蚀一部分的Ni,使Ni的粒径更小,从而得到y-k类型的核壳材料。不懂可以给我发短消息。
6楼2013-11-11 10:47:07
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liuchuanao

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引用回帖:
6楼: Originally posted by ThxVV at 2013-11-11 10:47:07
这里你好好看一下 ,他做的是y-s不是c-s,c-s就是一般的核壳,y-k就像铃铛一样的核壳,里面一个小的核,外面一个壳,中间有空腔。c-s是core-shell,y-k是yolk-shell。这里Ni NPs和Ni@SiO2 C-S制备都能看得懂吧?加入 ...

嗯,最近我也看了别的文献,相对比,明白加乙醇和盐酸的作用了,谢谢呀
7楼2013-11-12 13:13:25
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ThxVV

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引用回帖:
7楼: Originally posted by liuchuanao at 2013-11-12 13:13:25
嗯,最近我也看了别的文献,相对比,明白加乙醇和盐酸的作用了,谢谢呀...

恩 乙醇的作用应该就是沉降,利用纳米粒子在乙醇中溶解度低的原理
8楼2013-11-13 10:52:58
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chy-scu

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看英文的描述乙醇好像是沉淀剂,用盐酸一般可以有利于溶解,也可以调节粘稠度。建议通读全文。
9楼2013-11-13 11:38:06
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liuchuanao

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引用回帖:
9楼: Originally posted by chy-scu at 2013-11-13 11:38:06
看英文的描述乙醇好像是沉淀剂,用盐酸一般可以有利于溶解,也可以调节粘稠度。建议通读全文。

嗯,最近经过仔细看多篇文献对比才明白了。

现在主要是不明白三辛基磷的作用及机理。。。
10楼2013-11-13 17:21:27
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