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cuoce木蟲 (小有名氣)
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[求助]
二氧化硅包覆金棒后離心無法溶解在乙醇中的問題
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請教各位,我用二氧化硅包覆金棒,參考的文獻的方法是:the CTAB surfactants in the crude GNRs suspension (200 mL) were removed via two cycles of centrifugation/rinsing (12000 rpm, 15 min), and then re-dispersed in 50 mL Milli-Q water. Subsequently, it was transferred into an aqueous solution of CTAB (250 mL, 0.8 mM), and KOH solution (0.1 M) was added to adjust the pH value to ca. 10. After equilibration at 33 °C for 30 min, a solution of TEOS/APTES/ethanol (0.9 mL, 1/0.05/4 vol.) was added into the mixture by three times (0.3 mL per injection) under gentle stirring at 30-minute intervals. The reaction mixture was allowed to react at 33 °C for 12 h. The synthesized product was centrifuged (12,000 rpm, 15 min) and re-dispersed in ethanol. 按照如上方法包覆后離心一次分散在水中沒問題,但是吸收峰是藍移的,分散在乙醇中立馬顏色變?yōu)樽纤{色,測UV吸收峰發(fā)現(xiàn)沒有吸收峰了。請問問題出在哪兒呢? |
木蟲 (著名寫手)
木蟲 (著名寫手)
金蟲 (著名寫手)
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