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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Direct Observation of DPPC Phase Domain Motion on Mica Surfaces under Conditions of High Relative Humidity
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Direct Observation of DPPC Phase Domain Motion on Mica Surfaces under Conditions of High Relative Humidity

机译：在高相对湿度条件下对云母表面DPPC相域运动的直接观察

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摘要

Langmuir-Blodgett monolayers of L-α-dipalmitoylphosphatidylcholine (DPPC) doped with 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (diIC↓(18)) are studied under conditions of high relative humidity (RH). Monolayers transferred to a freshly cleaved mica surface in the liquid expanded (LE)-liquid condensed (LC) phase coexistence region of the pressure isotherm are studied with tapping-mode atomic force microscopy (TM-AFM), near-field scanning optical microscopy (NSOM), and confocal microscopy. As the RH is increased above 65%, the small LE and LC domains become mobile on the surface and aggregate to form larger domains of like phase. Analysis of the AFM images confirms that this process does not reflect phase transitions in the monolayer at increased RH but is driven by the energetically favorable decrease in the interfacial line energy of the lipid domains upon aggregation. NSOM measurements of the monolayer confirm that the evolution in the monolayer structure at high RH does not involve defect formation, collapse of the film, or removal of lipid. The evolution in monolayer properties at increasing RH is also found to be very sensitive to the composition of the subphase used in the film transfer process, which may be important for practical applications of these films.
机译：在相对湿度较高的条件下（1,18'-二十八烷基-3,3,3'，3'-四甲基吲哚碳菁高氯酸盐（diIC↓（18））掺杂了L-α-二棕榈酰磷脂酰胆碱（DPPC）的Langmuir-Blodgett单层膜RH）。用拍击模式原子力显微镜（TM-AFM），近场扫描光学显微镜（）研究了转移到压力等温线的液体膨胀（LE）-液体冷凝（LC）相共存区域中的新裂解云母表面的单层膜。 NSOM）和共聚焦显微镜检查。当RH增加到65％以上时，小的LE和LC域在表面上变得可移动并聚集形成相似相的较大域。对AFM图像的分析证实，该过程并未反映出在RH增大时单层中的相变，而是由脂质域在聚集时在能量上有利的降低所驱动。单层的NSOM测量证实，在高RH下单层结构的演变不涉及缺陷形成，膜塌陷或脂质去除。还发现在相对湿度增加时单层性能的演变对薄膜转移过程中使用的亚相的组成非常敏感，这对于这些薄膜的实际应用可能很重要。

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