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铁杆木虫 (正式写手)

[求助] 制备的金纳米棒如何确定浓度?

按照文献 制备金纳米棒:Chem. Mater. 2005, 17, 4636-4641
步骤如下:Gold Nanorod Synthesis. Gold nanorods were prepared exactly
as described by Sau et al.,33 but scaled up to increase the quantity.
Gold seed particles were prepared by adding 250 íL of 10 mM
HAuCl4a3H2O to 7.5 mL of 100 mM cetyltrimethylammonium
bromide (CTAB) with brief, gentle mixing. Next, 600 íL of freshly
prepared, ice-cold 10 mM NaBH4 solution was added followed by
mixing for 2 min. The pale brown seed solution was stable and
usable for several days. The nanorod growth solution was prepared
by adding the following reagents to a plastic tube in the following
order and then gently mixing: 40 mL of 100 mM CTAB, 1.7 mL
of 10 mM HAuCl4a3H2O, 250 íL of 10 mM AgNO3. Next, 270
íL of 100 mM ascorbic acid was added, which changed the solution
from brown-yellow to colorless. To initiate nanorod growth, 420íL of the seed solution was added to the growth solution, mixed gently, and left still for 3 h.
之后离心,纯化,得到的AuNR@CTAB储存在水中备用。
   接下来,文章中就用3 mL (25 nM) of the originalAuNR@CTAB in water.
我想知道的就是金纳米棒的浓度(25nM) 是如何得出的呢?离心后用多少量的水储存也没有说。
   制备出来的金棒溶液怎么计算其浓度?
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铁杆木虫 (正式写手)

怎么没有人回复我呢?伤心!
2楼2013-07-12 08:54:55
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铁杆木虫 (正式写手)

引用回帖:
3楼: Originally posted by CruiserD at 2013-07-12 10:12:49
难道是测的?取点样品消解后用AAS测一下(当然要做Au标准曲线)确定浓度?

Au的标准曲线怎么做呢?
4楼2013-07-12 10:50:12
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铁杆木虫 (正式写手)

引用回帖:
5楼: Originally posted by zihua886 at 2013-07-12 11:12:50
自己用氯金酸配一系列标准溶液。...

对于金棒浓度的测定 能说的详细一些吗?具体到步骤
6楼2013-07-13 22:23:06
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铁杆木虫 (正式写手)

引用回帖:
8楼: Originally posted by 小鱼1989 at 2013-07-14 18:09:42
有个粗略估计方法,Quantitation of Metal Content in the Silver-Assisted Growth of Gold Nanorods, 楼主看看

你给的文献我看了 ,可是我有个问题啊 ,他的不同横纵比的金棒的 Extinction Coefficients是怎么算出来的呢?我没弄明白呀。
9楼2013-07-15 22:49:40
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铁杆木虫 (正式写手)

送红花一朵
引用回帖:
11楼: Originally posted by 小鱼1989 at 2013-07-16 09:57:56
他是用精确的测量手段,即ICP,反推得到Extinction Coefficients;作者就提到他们这个用途就是估算金棒浓度,即我们测出纵向吸收峰,找出对应于作者计算得到的Extinction Coefficients,根据L=abc,即知道金棒的浓度 ...

文献中前面用icp已经测得了各个横纵比的金的浓度了,后面通过测得纵向吸收峰, Extinction Coefficients就算出来了,可是用算了,怎么和它的值不一样呢?所以没弄明白
12楼2013-07-16 22:27:16
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