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¿´µ½Ò»ÆªÎÄÏ×£¬Ì¼¹ÜÓÃSDBS·ÖÉ¢£¬³¬ÉùÀëÐĺ󣬳Áµíˮϴ¼¸´Î¶³¸É³ÆÖØ£¬ÒԴ˼ÆËãµÃµ½·ÖÉ¢ÒºµÄŨ¶È£¬½«´Ë·ÖÉ¢ÒºÖð¼¶Ï¡ÊÍ£¬»æÖÆÅ¨¶ÈºÍÎü¹â¶ÈµÄ±ê×¼ÇúÏߣ¬Õû¸ö¹ý³ÌÖØ¸´Îå´Î¡£ÄÇôÇë½Ì¸÷λ´óÉñ£¬Öظ´Îå´ÎºóÊǵõ½ÎåÌõÇúÏßÂð£¿ÄÇÕâÎåÌõÇúÏßÔõôÄâºÏ³ÉÒ»Ìõ£¿ÔÙÎÊÎÊÎÄÏ×µÄÒâ˼ÊDz»Í¬µÄ±íÃæ»îÐÔ¼ÁÐèÒª×ö²»Í¬µÄÇúÏßÂ𣿻¹ÊÇÖ»ÓÐÒ»Ìõ±ê×¼ÇúÏߣ¿Çó´óÉñÃÇ¿´¹ýÀ´ ¸½ÉÏÎÄÏ×ÔÎÄ£º Preparation of the calibration plot of SWNT dispersion in water: The calibration curve was obtained by plotting the absorbance vs concentration of SWNT in the dispersed state in water. To determine the quantity of nanotubes in dispersed state, SWNT (4mg) was added to an aqueous solution (16 mL) of SDBS (2.5mg/mL) to achieve an initial concentrationof SWNT in the aqueous mixture, 0.25 mg/mL. This aqueous suspension was tip sonicated for 10 min (at 40% power output) followed by bath sonicationfor 2h and tip sonication again for 10 min to prepare the aqueous dispersion of SWNT. Then the dispersion was centrifuged at 2300 g for 90 min. The supernatant was kept aside and used later. While the residue was washed well (3 times) so that it does not contain any trace of SDBS. Finally, theresidue was lyophilized to remove the residual water. The residue was then weighed which was found to be 0.24 mg. Therefore, the total amount of the dispersed SWNT in the supernatant was 0.16 mg i.e., the concentration of SWNT in dispersion was 0.1 mg/mL. For the determination of the absorbance, the optical density of this supernatant was measured at 550 nm through progressive dilution. The dilution was achieved by using SDBS solution (2.5mg/mL) to ensure that similar surfactant concentration is maintained while a successive dilution is obtained for the SWNT dispersions. The absorbance values were plotted as a function of quantity of SWNT in dispersed state. In every case, background correction was performed with the aqueous solution of the respective surfactants in the absence of SWNT. The entire process was repeated for 5 times. |
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