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Originally posted by gaochunxia at 2011-02-10 08:14:18:
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americanyk(½ð±Ò+3): »¶Ó­ÌÖÂÛ£¡ 2011-02-18 15:42:40
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For example :At first, PLA or PLGA sponges were prepared by a particulate-
leaching technique using sieved sodium chloride
particulates or pre-prepared ice particulates as a porogen.
After sodium chloride or pre-prepared ice particulates
were removed by washing with water or freeze-drying, porous
structures were formed.
http://onlinelibrary.wiley.com/d ... 55%3E3.0.CO;2-C/pdf
2F2001&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1646345283&_rerunOrigin=scholar.google&_acct=C000050561&_version=1&_urlVersion=0&_userid=4248650&md5=dec6c8e5e4709a045a21062afe8c00f6&searchtype=a#sec2.2
A solution of chitosan (1.5% in weight) in 0.5  aqueous acetic acid was prepared and one of soluble porogens such as sodium chloride, glucose and sucrose was then dissolved in it. The mixture was poured into the mould containing the dry chitosan film at its bottom. The mold was immediately frozen at −28¡ãC and then lyophilized in a freeze-dryer (FTSTM Systems Inc., USA) to give a porous sponge layer over the film.http://www.sciencedirect.com/sci ... _coverDate=02%2F15%
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5Â¥2011-02-18 14:16:25
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