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首页> 外文OA文献 >Tuning the self-assembled monolayer formation on nanoparticle surfaces with different curvatures: Investigations on spherical silica particles and plane-crystal-shaped zirconia particles
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Tuning the self-assembled monolayer formation on nanoparticle surfaces with different curvatures: Investigations on spherical silica particles and plane-crystal-shaped zirconia particles

机译：调整具有不同曲率的纳米颗粒表面上的自组装单层形成：对球形二氧化硅颗粒和平面晶体状氧化锆颗粒的研究

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The ordering of dodecyl-chain self-assembled monolayers (SAM) on different nanoscopic surfaces was investigated by FT-IR studies. As model systems plane-crystal-shaped ZrO2 nanoparticles and spherical SiO2 nanoparticles were examined. The type of capping agent was chosen dependent on the substrate, therefore dodecylphosphonic acid and octadecylphosphonic acid were used for ZrO2 and dodecyltrimethoxysilane for SiO2 samples. The plane ZrO2 nanocrystals yielded more ordered alkyl-chain structures whereas spherical SiO2 nanoparticles showed significantly lower alkyl-chain ordering. Submicron-sized silica spheres revealed a significantly higher alkyl chain ordering, comparable to an analogously prepared SAM on a non-curved plane oxidized Si-wafer. In the case of ZrO2 nanocrystals an intense alkyl-chain alignment could be disturbed by decreasing the grafting density from the maximum of 2.1 molecules/nm2 through the variation of coupling agent concentration to lower values. Furthermore, the co-adsorption of a different coupling agent, such as phenylphosphonic acid for ZrO2 and phenyltrimethoxysilane for SiO2, resulted in a significantly lower alkyl-chain ordering for ZrO2 plane crystals and for large SiO2 spherical particles at high grafting density. An increasing amount of order-disturbing molecules leads to a gradual decrease in alkyl-chain alignment on the surface of the inorganic nanoparticles. In the case of the ZrO2 nanoparticle system it is shown via dynamic light scattering (DLS) that the mixed monolayer formation on the particle surface impacts the dispersion quality in organic solvents such as n-hexane.
机译：FT-IR研究了十二烷基链自组装单分子膜（SAM）在不同纳米表面上的有序性。作为模型系统，检查了平面晶体形状的ZrO2纳米颗粒和球形SiO2纳米颗粒。封端剂的类型取决于基材，因此十二烷基膦酸和十八烷基膦酸用于ZrO2，十二烷基三甲氧基硅烷用于SiO2样品。平面ZrO2纳米晶体产生更有序的烷基链结构，而球形SiO2纳米颗粒显示出明显较低的烷基链有序性。亚微米尺寸的二氧化硅球显示出明显更高的烷基链有序性，与在非弯曲平面氧化硅晶圆上类似制备的SAM相当。在ZrO2纳米晶体的情况下，通过将接枝剂浓度从最大2.1分子/ nm2降低到最大值（通过将偶联剂浓度变化到更低的值）可能会干扰强烈的烷基链排列。此外，不同偶联剂（例如ZrO2的苯基膦酸和SiO2的苯基三甲氧基硅烷）的共吸附导致ZrO2平面晶体和大SiO2球形颗粒在高接枝密度下的烷基链排列明显降低。数量级增加的扰乱分子导致无机纳米颗粒表面上的烷基链排列逐渐减少。在ZrO2纳米粒子系统的情况下，通过动态光散射（DLS）显示，粒子表面上混合的单层形成会影响在有机溶剂（例如正己烷）中的分散质量。

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