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首页> 美国卫生研究院文献>Molecules >Interfacial Behavior of Oligo(Ethylene Glycol) Dendrons Spread Alone and in Combination with a Phospholipid as Langmuir Monolayers at the Air/Water Interface
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Interfacial Behavior of Oligo(Ethylene Glycol) Dendrons Spread Alone and in Combination with a Phospholipid as Langmuir Monolayers at the Air/Water Interface

机译：寡聚（乙二醇）树枝在空气/水界面处单独扩散并与作为Langmuir单分子层的磷脂结合的界面行为

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摘要

Dendrons consisting of two phosphonate functions and three oligo(ethylene glycol) (OEG) chains grafted on a central phenoxyethylcarbamoylphenoxy group were synthesized and investigated as Langmuir monolayers at the surface of water. The OEG chain in the position was grafted with a -Bu end-group, a hydrocarbon chain, or a partially fluorinated chain. These dendrons are models of structurally related OEG dendrons that were found to significantly improve the stability of aqueous dispersions of iron oxide nanoparticles when grafted on their surface. Compression isotherms showed that all OEG dendrons formed liquid-expanded Langmuir monolayers at large molecular areas. Further compression led to a transition ascribed to the solubilization of the OEG chains in the aqueous phase. Brewster angle microscopy (BAM) provided evidence that the dendrons fitted with hydrocarbon chains formed liquid-expanded monolayers throughout compression, whilst those fitted with fluorinated end-groups formed crystalline-like domains, even at large molecular areas. Dimyristoylphosphatidylcholine and dendron molecules were partially miscible in monolayers. The deviations to ideality were larger for the dendrons fitted with a fluorocarbon end-group chain than for those fitted with a hydrocarbon chain. Brewster angle microscopy and atomic force microscopy supported the view that the dendrons were ejected from the phospholipid monolayer during the OEG conformational transition and formed crystalline domains on the surface of the monolayer.
机译：合成了由两个膦酸酯官能团和三个连接在中心苯氧基乙基氨基甲酰基苯氧基上的低聚（乙二醇）（OEG）链组成的树枝，并将其作为水表面的Langmuir单层进行研究。该位置的OEG链接有-Bu端基，烃链或部分氟化的链。这些树突是与结构相关的OEG树突的模型，发现它们在接枝到其表面时可显着提高氧化铁纳米颗粒水分散体的稳定性。压缩等温线表明，所有OEG树突均在大分子区域形成液体膨胀的Langmuir单层。进一步压缩导致归因于水相中OEG链增溶的转变。布鲁斯特角显微镜（BAM）提供的证据表明，装有烃链的树枝状分子在整个压缩过程中形成了液体膨胀的单分子层，而装有氟化端基的树枝状分子即使在大分子区域也形成了晶体状结构域。二肉豆蔻酰基磷脂酰胆碱和树突分子在单层中可部分混溶。装有氟碳端基链的树突的理想偏差比装有烃链的树突的理想偏差大。布鲁斯特角显微镜和原子力显微镜支持这样一种观点，即在OEG构象转变过程中，树枝状分子从磷脂单层中弹出，并在单层表面形成晶畴。

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