Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, USA.
ACS Appl Mater Interfaces. 2011 Jun;3(6):1865-72. doi: 10.1021/am200052a. Epub 2011 May 24.
The silica nanoparticles with a rough surface were developed using a silane precursor in a reverse microemulsion followed by a drying treatment. The surface roughness of the nanoparticles was adjustable by changing the amount of the precursor. Within a certain range, the roughness increased as the amount of the silane precursor increased. The rough surface provided a larger surface area than the smooth one. The produced nanoparticles were characterized using the transmission electron microscopy, ultraviolet-visible spectroscopy, energy-dispersive X-ray elemental analysis, and Brunauer-Emmet-Teller analysis technique. Additionally, the amount of surface functional amino groups on the nanoparticles was detected using the traditional acid-base titration and the dissociation constant of this functional group was calculated. On the basis of the experimental results, the mechanism of the formation of the rough surface was proposed. Finally, the produced silica nanoparticles were utilized as a carrier for the chemical binding of a near-infrared dye molecule and the adsorption of the gold nanoparticles. The results demonstrated that the rough surface provide the silica nanoparticles with a high capacity of surface chemical and supramolecular reactions.
采用硅烷前驱体在反胶束中制备了具有粗糙表面的纳米二氧化硅颗粒，然后进行干燥处理。通过改变前驱体的用量可以调节纳米颗粒的表面粗糙度。在一定范围内，随着硅烷前驱体用量的增加，粗糙度增加。粗糙表面比光滑表面提供了更大的表面积。采用透射电子显微镜、紫外-可见分光光度计、能谱仪和 Brunauer-Emmet-Teller 分析技术对所制备的纳米颗粒进行了表征。此外，还采用传统的酸碱滴定法检测了纳米颗粒表面功能氨基基团的含量，并计算了该功能基团的离解常数。根据实验结果，提出了粗糙表面形成的机理。最后，将制备的二氧化硅纳米颗粒用作近红外染料分子的化学键合和金纳米颗粒吸附的载体。结果表明，粗糙表面使二氧化硅纳米颗粒具有高的表面化学和超分子反应能力。
