Nistor Cristina Lavinia, Ianchis Raluca, Ghiurea Marius, Nicolae Cristian-Andi, Spataru Catalin-Ilie, Culita Daniela Cristina, Pandele Cusu Jeanina, Fruth Victor, Oancea Florin, Donescu Dan
R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
"Ilie Murgulescu" Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
Nanomaterials (Basel). 2016 Jan 5;6(1):9. doi: 10.3390/nano6010009.
The present study describes for the first time the synthesis of silica nanoparticles starting from sodium silicate and oleic acid (OLA). The interactions between OLA and sodium silicate require an optimal OLA/OLANa molar ratio able to generate vesicles that can stabilize silica particles obtained by the sol-gel process of sodium silicate. The optimal molar ratio of OLA/OLANa can be ensured by a proper selection of OLA and respectively of sodium silicate concentration. The titration of sodium silicate with OLA revealed a stabilization phenomenon of silica/OLA vesicles and the dependence between their average size and reagent's molar ratio. Dynamic light scattering (DLS) and scanning electron microscopy (SEM) measurements emphasized the successful synthesis of silica nanoparticles starting from renewable materials, in mild condition of green chemistry. By grafting octadecyltrimethoxysilane on the initial silica particles, an increased interaction between silica particles and the OLA/OLANa complex was achieved. This interaction between the oleyl and octadecyl chains resulted in the formation of stable gel-like aqueous systems. Subsequently, olive oil and an oleophylic red dye were solubilized in these stable aqueous systems. This great dispersing capacity of oleosoluble compounds opens new perspectives for future green chemistry applications. After the removal of water and of the organic chains by thermal treatment, mesoporous silica was obtained.
本研究首次描述了以硅酸钠和油酸（OLA）为原料合成二氧化硅纳米颗粒的过程。OLA与硅酸钠之间的相互作用需要一个最佳的OLA/OLANa摩尔比，以生成能够稳定通过硅酸钠溶胶 - 凝胶过程获得的二氧化硅颗粒的囊泡。通过适当选择OLA和硅酸钠浓度，可以确保OLA/OLANa的最佳摩尔比。用OLA滴定硅酸钠揭示了二氧化硅/OLA囊泡的稳定现象及其平均尺寸与试剂摩尔比之间的关系。动态光散射（DLS）和扫描电子显微镜（SEM）测量结果表明，在绿色化学的温和条件下，成功地从可再生材料合成了二氧化硅纳米颗粒。通过将十八烷基三甲氧基硅烷接枝到初始二氧化硅颗粒上，二氧化硅颗粒与OLA/OLANa络合物之间的相互作用增强。油酰基和十八烷基链之间的这种相互作用导致形成稳定的凝胶状水性体系。随后，将橄榄油和一种亲油性红色染料溶解在这些稳定的水性体系中。油溶性化合物的这种强大分散能力为未来的绿色化学应用开辟了新的前景。通过热处理除去水和有机链后，得到了介孔二氧化硅。
