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[求助]
如何將成都有機(jī)物化所碳納米管切短到200nm?
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These cut tubes were prepared in a two-step process: cutting and polishing. In a typical example, 10 mg of the purified SWNT “bucky paper” (Fig. 1B) was suspended in 40 ml of a 3:1 mixture of concentrated H2SO4/HNO3 in a 100-ml test tube and sonicated in awater bath [Cole Palmer (Verona Hills, IL) model B3-R, 55 kHz] for 24 hours at 35° to 40°C. The resultant suspension was then diluted with 200 ml of water, and the larger cut SWNTs were collected on a 100-nm pore filter mem- brane (type VCTP; Millipore) and washed with 10 mM NaOH solution. The cut tubes were then further pol- ished by suspension in a 4:1 mixture of concentrated H2SO4:30% aqueous H2O2 and stirring at 70°C for 30 min. After filtering and washing again on a 100-nm pore filter, the cut nanotubes were suspended at a density of 0.1 mg/ml in water with the aid of 0.5 weight % Triton X-100 surfactant. 這是science上一片名為Fullerene Pipes上的文章中削短碳納米管的介紹,不明白的問題有二: 1.上面說的55kHz不會是真的吧,應(yīng)該是他那個儀器的最大頻率吧?我們實(shí)驗(yàn)室也有一個power130w,Frequency20kHz的超聲杯,我不知道要把AMPL設(shè)為百分之多少。 2.最后要加硫酸與雙氧水polishing是什么意思? 我的目的是把碳納米管切成200nm的長度來做排列,很糾結(jié),我感覺按照文獻(xiàn)上做也不正確,因?yàn)樵喜煌,我買的是成都有機(jī)物物化所的,不知道有誰做過切短的實(shí)驗(yàn)?我們學(xué)校做TEM很不方便,焦急中~~~ |
木蟲 (小有名氣)
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