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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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2楼2010-04-16 21:38:33
melody-yhl
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3楼2010-04-16 21:50:47
melody-yhl
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4楼2010-04-16 22:45:21
melody-yhl
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709069180(金币+30, 翻译EPI+1):太迟了点啊 我东西都交上去了啊 呵呵 还是送你30个 希望不要介意啊 2010-04-18 16:51
wg423(金币+50): 代发 2011-04-10 13:02:39
709069180(金币+30, 翻译EPI+1):太迟了点啊 我东西都交上去了啊 呵呵 还是送你30个 希望不要介意啊 2010-04-18 16:51
wg423(金币+50): 代发 2011-04-10 13:02:39
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在本研究中用以制备CS–MMT 纳米水凝胶的壳聚糖是由Aldrich–Sigma提供,且未经提纯而使用。Darder等人报道了相同类型的壳聚糖,他报道该壳聚糖具有342,500 gmol-1的分子量及大约75%的脱乙酰化度(DD)[14]。用于制备缓冲液的醋酸及磷酸钠购自Aldrich Chemicals。选择维生素B12(Sigma–Aldrich Co.)作为表征自纳米水凝胶的释放行为的模型分子。由 Nanocor Co.供应的Na+蒙脱石为具有120 meq. (100 g) 1.阳离子交换容量的分层smectiteclay的Na+形式。MMT 血小板显示约200-500nm长及数十纳米宽的表面尺寸。 制备CS-MMT纳米水凝胶 为制备CS-MMT纳米水凝胶,制备方法分为两个阶段。 第一个阶段为:制备含MMT及CS的悬浮液,两者质量比为1:2(其中,将预确定量的CS 溶解在1 wt.%醋酸溶液中,并搅拌4 h 直到CS完全溶解来制备CS溶液)。第一个阶段为:制备含MMT及CS的悬浮液,两者质量比为1:2(其中,将预确定量的CS 溶解在1 wt.%醋酸溶液中,并搅拌4 h 直到CS完全溶解来制备CS溶液)。 将CS 添加到含2 wt.% MMT的水溶液中,接着在50 下搅拌24小时来获得CS-MMT悬浮液。 为增强最终纳米水凝胶中MMT的脱落形成,将CS与MMT比率为2:1的该悬浮液经受球磨历时24 h,然后将所制备的最终CS-MMT 悬浮液用以形成纳米水凝胶。 在制备CS-MMT纳米水凝胶的第二个阶段中,将CS溶解在1 wt.%的醋酸溶液中而获得2 wt.% CS 溶液。然后将少量的已球磨CS-MMT悬浮液添加至已制备的CS溶液中以形成富含CS的悬浮液,相对于悬浮液总CS的总质量,MMT含量控制在1、2、3及4%的范围内,在60°下连续搅拌1h。接着将该最终悬浮液投到皮氏培养皿(Petri dishes)中并在30°下干燥24 h,以形成最终干燥纳米水凝胶。 然后用1 M的NaOH 水溶液冲洗该干燥纳米水凝胶 ,接着再用蒸馏水洗涤并在40°真空下干燥1周直到使用。用定义CS-MMTn中的MMT含量的n值来表达纳米水凝胶的组成,其中n=C mmt,并入纳米水凝胶中的MMT含量 ,其在1%至4%范围内变动 |

5楼2010-04-17 08:15:52
melody-yhl
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6楼2010-04-17 08:24:55












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