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木虫 (小有名气)

应助: 0 (幼儿园)
金币: 2934.6
帖子: 204
在线: 28.3小时
虫号: 895199
注册: 2009-11-06
专业: 无机合成和制备化学

[交流] 求助有关于无机化学的英语翻译

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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