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利用原子力显微镜(AFM)研究了二棕榈酰磷脂酸(DPPA)的单层,双层和三层Langmuir-Blodgett膜的分子排列结构,发现相邻的(2～6个)DPPA分子的极性头磷酸基团通过分子间氢键形成局域超分子结构.分子分辨的AFM图象表明,DP-PA LB膜中分子排列具有长程的取向和位置有序.DPPA分子的晶格排列随着LB膜层数的增加由单层和双层的六方晶格转变成三层的正交(四方)晶格.探讨了不同的pH下的DPPA极性头磷酸基团的分子间氢键作用及其对膜分子有序排列以及云母基片对DPPALB膜中分子排列的晶格结构的影响.
The molecular arrangement of single, double and triple Langmuir-Blodgett membranes of dipalmitoylphosphatidic acid (DPPA) was investigated by atomic force microscopy (AFM), and the polarity head of adjacent (2-6) DPPA molecules was found The phosphate groups formed a local supramolecular structure through the intermolecular hydrogen bonding.The molecularly resolved AFM images showed that the molecular arrangement of DP-PA LB film has long-range orientation and orderly ordering.The lattice arrangement of DPPA molecules with the LB film The increase of the number of layers transforms from single-layer and double-layer hexagonal lattices into three-layer orthogonal (tetragonal) lattices. The intermolecular hydrogen bonding of DPPA polar headphosphate groups at different pHs and their effects on The orderly arrangement of the membrane molecules and the influence of the mica substrate on the molecular arrangement of the lattice structure in the DPPALB membrane.