可再分散性杂化纳米粉体：氧化铈纳米粒子与磷酸化PEG低聚物的复合物
Redispersible Hybrid Nanopowders: Cerium Oxide Nanoparticle Complexes with Phosphonated-PEG Oligomers
摘要：
稀土氧化铈（二氧化铈）纳米粒子的稳定使用端功能膦酸化的PEG低聚物。所得到的混合核-壳单态纳米胶体的络合过程和结构的描述，其特征在于和建模使用光和中子散射数据。的吸附机制是非化学计量，产生的吸附链的数量每颗粒Nads = 270饱和。吸附等温线显示膦酸酯头对二氧化铈表面的高亲和力（吸附能~-16kT），表明络合的静电驱动力。通过形成覆盖有良好锚定的PEG层的纳米尺寸的氧化铈颗粒，突出了络合的容易性、效率和完整性，保持了原始溶胶的特性。这种溶剂化刷状层足以溶解颗粒并大大扩展原始溶胶的稳定范围直至pH = 9。我们强调定制溶胶的两个关键属性：i）官能化后的强UV吸收能力和ii）在冷冻干燥后作为粉末以不同浓度作为单线态纳米胶体在水性或有机溶剂中再分散的能力。这个强大的平台能够将矿物氧化物纳米颗粒的固有特性转化为关键的最终用途。
英文摘要：
Rare earth cerium oxide (ceria) nanoparticles are stabilized using end-functional phosphonated-PEG oligomers. The complexation process and structure of the resulting hybrid core-shell singlet nanocolloids are described, characterized and modeled using light and neutron scattering data. The adsorption mechanism is non-stoichiometric, yielding the number of adsorbed chains per particle Nads = 270 at saturation. Adsorption isotherms show a high affinity of the phosphonate head for the ceria surface (adsorption energy ~ -16 kT) suggesting an electrostatic driving force for the complexation. The ease, efficiency and integrity of the complexation is highlighted by the formation of nanometric sized cerium oxide particles covered with a well anchored PEG layer, maintaining the characteristics of the original sol. This solvating brush-like layer is sufficient to solubilize the particles and greatly expand the stability range of the original sol up to pH = 9. We underscore two key attributes of the tailored sol: i) strong UV absorption capability after functionalization and ii) ability to re-disperse after freeze-drying as powder in aqueous or organic solvents in varying concentrations as singlet nanocolloids. This robust platform enables translation of intrinsic properties of mineral oxide nanoparticles to critical end use.
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