Flow of pH-responsive microcapsules in porous media

Flow of pH-responsive microcapsules in porous media
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pH 响应微胶囊在多孔介质中的流动

DOI:
10.1016/j.ces.2014.11.009
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发表时间:
2015
影响因子:
4.7
通讯作者:
Gun W
Gun W
中科院分区:
工程技术2区
文献类型:
--
作者:
Gun W

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本文研究了使用含有胶凝剂羟丙基纤维素 (HPC) 的微胶囊来改变多孔介质中的流动路径。目的是优先封锁高渗透率区域,从而将水流转移到相邻的未波及的低渗透率区域。使用聚(4-乙烯基吡啶)(PVP)作为壳材料,通过溶剂蒸发进行聚合物沉淀,制成直径为 2–7 µm 的微胶囊。建造了定制的流动罐以促进多孔介质流动,并进行了单渗透率和双渗透率实验。即使没有胶凝剂,微胶囊也会逐渐堵塞玻璃珠网络的孔喉。酸化后观察到渗透性下降。这是因为 PVP 壳的膨胀收缩了孔喉。观察到渗透率下降对于低渗透率区域更为显着。使微胶囊流过具有两个平行渗透性区域的罐,可以选择性地阻塞高渗透性区域。
This article investigates the use micro-capsules, containing a gelling agent hydroxypropyl cellulose (HPC), to alter flow paths in porous media. The aim is to preferentially block-off high permeability regions, thereby diverting the flow into adjacent un-swept low permeability regions. Micro-capsules with 2–7 µm in diameter were made by polymer precipitation through solvent evaporation using poly(4-vinyl pyridine) (PVP) as the shell material. A customised flow tank was constructed to facilitate porous media flow and both single and dual permeability experiments were conducted. Even without gelling agent, the micro-capsules gradually blocked the pore throats of the glass beads network. Following acidification a drop in permeability was observed. This was because swelling of the PVP shell constricted the pore throats. The permeability drop was observed to be more significant for low permeability regions. Flowing micro-capsules through the tank with two permeability regions in parallel allowed the high permeability region to be selectively blocked.
DOI: 10.1016/0021-9797(73)90046-5
发表时间: 1973-03
影响因子: 9.9
作者:
R. Avery;J. Ramsay
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