Induction of Circular Patterns of Calcium Oxalate Monohydrate on Mica-Supported Defective Monolayer Films of Dipalmitoylphosphatidylcholine
Induction of Circular Patterns of Calcium Oxalate Monohydrate on Mica-Supported Defective Monolayer Films of Dipalmitoylphosphatidylcholine
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DOI：
10.1021/cg070431u
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发表时间：
2009-01
影响因子：
3.8
通讯作者：
Sui-Ping Deng;J. Ouyang
中科院分区：
文献类型：
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作者：
Sui-Ping Deng;J. Ouyang
用荧光显微镜和原子力显微镜观察了草酸钾（K2 C2 O 4）处理后的二棕榈酰磷脂酰胆碱（dipalmitoylphosphatidylcholine，DPO）转移到云母表面的液相凝聚（liquid condensed，LC）区和液相膨胀（liquid expanded，LE）区的微观结构。K2 C2 O 4破坏了单层中有序的分子阵列，尤其是在LC/LE边界处。结果，形成环状缺陷域。扫描电子显微镜结果表明，缺陷域可以诱导形成一水草酸钙（COM）晶体的圆形图案。随着K_2C_2O_4 [c（K_2C_2O_4）]浓度从0.3增加到5.0 mmol/L，K_2C_2O_4对单分子膜的作用逐渐增强。经0.3mmol/LK 2C 2 O 4处理后的单层膜中，COM晶体呈实心圆形排列，即COM晶体在畴内紧密排列。当c（K2 C2 O 4）增加到5.0 mmol/L时，图形变为环状，即出现了明显的斑点。
Fluorescence microscopy and atomic force microscopy were used to observe the microstructures of liquid condensed (LC) domains and liquid expanded (LE) phases in monolayers of dipalmitoylphosphatidylcholine transferred to a mica surface after treatment by potassium oxalate (K2C2O4). The orderly molecular arrays in the monolayers were destroyed by K2C2O4, especially at the LC/LE boundaries. As a result, circular defective domains were formed. Scanning electron microscopy results showed that the defective domains could induce the formation of circular patterns of calcium oxalate monohydrate (COM) crystals. As the concentration of K2C2O4 [c(K2C2O4)] increased from 0.3 to 5.0 mmol/L, the effect of K2C2O4 on the monolayers was gradually strengthened. The monolayers treated by 0.3 mmol/L K2C2O4 induced solid circular patterns of COM crystals; that is, the COM crystallites were compactly arrayed in the domains. When c(K2C2O4) was increased to 5.0 mmol/L, the patterns turned to a ring shape; that is, there were cr...