Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
Nanoscale. 2011 Nov;3(11):4774-9. doi: 10.1039/c1nr10843c. Epub 2011 Oct 11.
Monodispersed magnesium fluoride nanoparticles are utilized for the first time to prepare transparent inorganic-organic nanocomposite materials with improved mechanical properties. The fluorolytic sol-gel synthesis route has been modified for the preparation of monodispersed magnesium fluoride nanoparticles with a size of 2-3 nm. MgF(2) particles are effectively stabilised against agglomeration by phosphonic acids, which strongly bind to the particles and lead to an increased compatibility of the inorganic particles with the organic polymers. This way, highly transparent nanocomposite materials with up to 20 wt% magnesium fluoride in different acrylates are obtained, featuring high dispersion of MgF(2) particles in the polymer matrix and an increased hardness by the factor of 2. The nature of interaction between phosphonic acids and magnesium fluoride is thoroughly investigated by IR and NMR showing a monodentate coordination of phosphonates to the particle's surface.
首次利用单分散氟化镁纳米颗粒制备了具有改善力学性能的透明无机-有机纳米复合材料。对氟解溶胶-凝胶合成路线进行了改进，以制备粒径为 2-3nm 的单分散氟化镁纳米颗粒。膦酸强烈结合到颗粒上，有效地稳定了氟化镁颗粒，防止了团聚，从而提高了无机颗粒与有机聚合物的相容性。通过这种方式，在不同的丙烯酸酯中可以获得高达 20wt%氟化镁的高透明纳米复合材料，其具有在聚合物基质中高度分散的 MgF2颗粒和硬度提高 2 倍的特点。通过红外和 NMR 对膦酸和氟化镁之间的相互作用进行了深入研究，结果表明膦酸与颗粒表面呈单齿配位。
