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求助 有关于无机化学的英语翻译
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高手帮忙哈 但绝对不能机器翻译 翻译的好再加金币哈 The chitosan used in this study to prepare the CS–MMT nanohydrogels was supplied by Aldrich–Sigma and used without purification. The same type of chitosan was used by Darder et al., who reported that it has an average molecular weight of 342,500 g mol1 and a deacetylation degree (DD) of ca. 75% [14]. Acetic acid and sodium phosphate for the preparation of buffers were purchased from Aldrich Chemicals. Vitamin B12 (Sigma–Aldrich Co.) was chosen as a model molecule to characterize the release behavior from the nanohydrogel. Na+-montmorillonite, supplied by Nanocor Co., is an Na+ form of layered smectite clay with a cationic exchange capacity (CEC) of 120 meq. (100 g)1. The MMT platelet shows a surface dimension of about 200–500 nm in length and several tens of nanometers in width. 2.2. Preparation of CS–MMT nanohydrogels To prepare the CS–MMT nanohydrogels, the preparation procedure is separated into two stages. The first stage is to prepare a suspension containing MMT and CS with a weight ratio of 1:2 (where the CS solution was prepared by dissolving predetermined amounts of CS in 1 wt.% acetic acid solution and stirring for about 4 h until the CS was completely dissolved). The CS–MMT suspensions were obtained by adding CS to an aqueous solution containing 2 wt.% MMT (i.e. 0.5 g of Na+-MMT dispersed in 25 ml of double-distilled water), followed by stirring at 50 C for 24 h. To enhance the formation of exfoliation of the MMT in the final nanohydrogel, the suspension with a CS to MMT ratio of 2:1 was then subjected to ball-milling for 24 h, after which the as-prepared final CS–MMT suspension was used to form nanohydrogel. In the second stage of the CS–MMT nanohydrogel preparation, 2 wt.% CS solution was obtained by dissolving CS in 1 wt.% acetic acid solution. A small amount of the ball-milled CS–MMT suspension was then added to the prepared CS solution to form a CS-rich suspension, with the MMT content controlled in the range of 1, 2, 3 and 4 wt.%, relative to the total weight of CS in the suspensions, under continuous stirring at 60 C for 1 h. This final suspension was then cast onto Petri dishes and dried at 30 C for 24 h, to form final dried nanohydrogels. The dried nanohydrogels were then rinsed with an aqueous solution of 1 M NaOH to remove any residual acetic acid, followed by washing with distilled water and drying for 1 week at 40 C in vacuum until use. The compositions of the nanohydrogels are expressed using the value of n to define the content of MMT in CS–MMTn, where n = C mmt, the content of the MMT incorporated in the nanohydrogels, which ranged from 1% to 4%. |
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melody-yhl
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