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北京石油化工学院2026年研究生招生接收调剂公告
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zms1209

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[求助] 做扫描电镜 要把样条用液氮冻多久

注塑出来的样条  现在在用液氮冷冻   动过之后打断  然后用扫描电镜观察  想问一下冻多长时间比较好  可以冻上
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zznjut

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万里独行之江湖散人

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感谢参与,应助指数 +1
It depends upon the types of your samples.
For example, if your samples are very brittle, there is no necessity for a long time, since it might even tend to be fractured ASAP.

In contrast, if your samples are of high tougheness(elastomer, e.g), more time is required, since it hardly be totally broken.

In sum, you should unify the time in order to eliminate the experimental errors.
禾口言皆土也王求
2楼2012-11-07 14:54:55
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zms1209

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引用回帖:
2楼: Originally posted by zznjut at 2012-11-07 14:54:55
It depends upon the types of your samples.
For example, if your samples are very brittle, there is no necessity for a long time, since it might even tend to be fractured ASAP.

In contrast, if you ...

主要是橡胶和聚丙烯   8个小时够吗
3楼2012-11-07 15:52:30
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zznjut

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3楼: Originally posted by zms1209 at 2012-11-07 15:52:30
主要是橡胶和聚丙烯   8个小时够吗...

You may try. In our group, the sample's thickness is no more than 1mm. Even for the neat elastomer such as POE, half an hour is sufficient.

I can not give you a direct answer, because the normal thickness of PP prepared by injection is usually around 2 mm (Dumbell). Which might need more time.

Remember that the main purpose to use liquid nitrogeon is to eliminate the possible stress damage during the process of preparing samples.
禾口言皆土也王求
4楼2012-11-07 15:58:28
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