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Based on two template-free secondary growth methods, the formation mechanism of single-layer and multi-layer zeolite membranes was investigated. The composition of the synthesis solution did not affect the membrane structure, whereas the position-setting of the seeded support in the synthesis solution and the ageing process of the synthesis solution were two critical factors in the formation of the membrane. The synthesis solution with lower viscosity could easily penetrate into the gap between seeds boundaries, resulting in the formation of multi-layer membranes. 相似文献
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本研究利用碳纤维和芳纶纤维通过湿法造纸成形技术制备导电纸基复合材料(CPCMs),探讨了碳纤维含量、长度与CPCMs导电逾渗阈值的相关性;并通过数值仿真软件Geodict模拟了CPCMs的结构,用于计算其电性能及导电逾渗阈值。结果表明,3 mm碳纤维制备的CPCMs表面电导率逾渗阈值为2. 25%,体积电导率逾渗阈值为2. 86%;不同长度碳纤维制备的CPCMs具有不同的电导率逾渗阈值,碳纤维长度2~9 mm范围内,随着碳纤维长度的增加,CPCMs的电导率逾渗阈值逐渐下降。模拟计算结果表明,当模拟区域大小为1 mm2时,2 mm长碳纤维的CPCMs模型逾渗阈值模拟结果与实验结果有较好的对应性。 相似文献
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