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Two main causes of gel cracking have been identified: (1) Evaporation of solvents during the drying step, which occurs specifically on the outer surface of the capillary network, since the solid material at the drying front is exposed to ambient atmosphere. Shrinking results from stress caused by the existence of a meniscus at the liquid–vapour interface, which generates a differential capillary pressure within the gel as the solvent tends to evaporate [10]. (2) The syneresis which takes place as the gel ages. This consists in the continuous rearrangement of particles through further condensation reactions with the associated loss of structural solvents (i.e., water and ethanol). This process leads to a better packing of the gel body and also to the undesirable process of fracturing. |
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weichin
铁杆木虫 (职业作家)
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2楼2012-01-16 22:51:23
【答案】应助回帖
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爱与雨下(金币+1): 2012-01-17 20:00:32
xufeigao(金币+25): 2012-01-18 09:59:13
爱与雨下(金币+1): 2012-01-17 20:00:32
xufeigao(金币+25): 2012-01-18 09:59:13
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翻译如下： 已确定凝胶破裂的两个主要原因：（1）由于在正面干燥的固体材料暴露于外周空气中，尤其是在毛细管网外表面发生的干燥步骤期间溶剂蒸发。由于在液-汽界面弯月形面（meniscus）的存在导致的压力产生缩水的结果，其中所述界面随着溶剂挥发，在凝胶内产生毛细管压力的差异。（2）脱水代替成为凝胶的老化（ages）。通过伴随结构溶剂（即，水和乙醇）共同损失，这些脱水过程存在于粒子连续重排过程之中。这个过程导致更佳的凝胶主体填装，也导致不期望的破裂过程。 意思应该没有错误，中间有些词语需要斟酌，供参考！ |
3楼2012-01-17 10:59:49
