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首页> 外文期刊>Chemistry: A European journal >Role of Capping Ligands on the Nanoparticles in the Modulation of Properties of a Hybrid Matrix of Nanoparticles in a 2D Film and in a Supramolecular Organogel
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Role of Capping Ligands on the Nanoparticles in the Modulation of Properties of a Hybrid Matrix of Nanoparticles in a 2D Film and in a Supramolecular Organogel

机译：纳米颗粒上的配体配体在二维膜和超分子有机凝胶中纳米颗粒杂化基质的性能调节中的作用。

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We incorporate various gold nanoparticles (AuNPs) capped with ifferent ligands in two-dimensional films and three-dimensional aggregates derived from N-stearoyl-l-alanine and Nlauroyl- l-alanine, respectively. The assembliesof N-stearoyl-l-alanine affordedstable ilms at the air–water interface. More compact assemblies were formed upon incorporation of AuNPs in the air–water interface of N-stearoyl- l-alanine. We then examined the effects of incorporation of various AuNPs functionalized with different capping ligands in three-dimensional assemblies of N-lauroyl-l-alanine, a compound that formed a gel in hydrocarbons. The profound influence of nanoparticle ncorporation into physical gels was evident from evaluation of various microscopic and bulk properties. The interaction of AuNPs with the gelator assembly was found to depend critically on the capping ligands protecting the Au surface of the gold nanoparticles. Transmission electron microscopy (TEM) showed a long-range directional assembly of certain AuNPs along the gel fibers. Scanning electron microscopy (SEM) images of the freeze-dried gels and nanocomposites indicate that the morphological transformation in the composite microstructures depends significantly on the capping agent of the nanoparticles. Differential scanning calorimetry (DSC) showed that gel formation from sol occurred at a lower temperature upon incorporation of AuNPs having capping ligands that were able to align and noncovalently interact with the gel fibers. Rheological studies indicate that the gel–nanoparticle composites exhibit significantly greater viscoelasticity compared to the native gel alone when the capping ligands are able to interact through interdigitation into the gelator assembly. Thus, it was ossible to define a clear relationship between the materials and the molecularlevel properties by means of manipulation of the information inscribed on the NP surface.
机译：我们在二维薄膜和分别来自N-硬脂酰基-1-丙氨酸和Nlauroyl-1-丙氨酸的三维聚集体中掺入了具有不同配体的各种金纳米颗粒（AuNPs）。 N-硬脂酰-1-丙氨酸的组装在空气-水界面提供了稳定的信息。在N-硬脂酰-1-丙氨酸的空气-水界面中掺入AuNP后，形成了更紧凑的组件。然后，我们在N-月桂酰-1-丙氨酸（在烃中形成凝胶的化合物）的三维组装中检查了用不同的封端配体官能化的各种AuNP的掺入效果。纳米粒子掺入物理凝胶的深远影响从各种微观和整体性质的评估中显而易见。发现金纳米粒子与胶凝剂组件的相互作用主要取决于保护金纳米粒子金表面的封端配体。透射电子显微镜（TEM）显示某些AuNPs沿凝胶纤维的长距离定向组装。冷冻干燥的凝胶和纳米复合材料的扫描电子显微镜（SEM）图像表明，复合物微观结构中的形态转变显着取决于纳米粒子的封端剂。差示扫描量热法（DSC）显示，在并入具有能够与凝胶纤维对齐并非共价相互作用的封端配体的AuNP时，由溶胶形成的凝胶在较低的温度下发生。流变学研究表明，当封端配体能够通过叉指化进入胶凝剂组件时，与单独的天然凝胶相比，凝胶-纳米颗粒复合材料表现出明显更高的粘弹性。因此，有可能通过操纵NP表面上刻写的信息来定义材料与分子水平性质之间的明确关系。

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