Incorporating anionic dyes into silica nanoparticles by using a cationic polyelectrolyte as a bridge
Incorporating anionic dyes into silica nanoparticles by using a cationic polyelectrolyte as a bridge
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使用阳离子聚电解质作为桥将阴离子染料掺入二氧化硅纳米颗粒中
DOI：
10.1039/c0jm02946g
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Yang, Wensheng
中科院分区：
文献类型：
--
作者：
Liang, Jinglun;Lu, Ziyang;Yang, Wensheng
以聚二烯丙基二甲基氯化铵（PDADMAC）为桥连剂，将带负电荷的染料8-羟基芘-1，3，6-磺酸三钠盐（HPTS）成功地嵌入到二氧化硅基质中。PDADMAC的正电荷被HPTS部分中和，形成PDADMAC-HPTS复合物。在引入Stober系统并预水解有限时间后，由于带负电荷的二氧化硅物种在其表面上的吸附，复合物的表面电荷迅速从正反转为负，这对于避免复合物絮凝并允许二氧化硅颗粒生长是重要的。通过改变复合物的正电荷或Stober系统的预水解时间，可以调节复合物的稳定性以及由此得到的颗粒的尺寸。由于染料和二氧化硅颗粒之间的静电相互作用，二氧化硅颗粒的光学性能得到改善，并且染料从颗粒中的泄漏被大大抑制。
A negatively charged dye, 8-hydroxypyene-1,3,6-sulfonic acid trisodium salt (HPTS), was successfully incorporated into a silica matrix by using a positively charged polyelectrolyte, poly (diallyldimethylammoniumchloride) (PDADMAC) as a bridge. The positive charges of PDADMAC were partially neutralized by HPTS upon the formation of PDADMAC–HPTS complexes. After being introduced into a Stober system and pre-hydrolyzed for a finite time, the surface charge of the complexes was rapidly reversed from positive to negative due to the absorption of the negatively charged silica species on their surface, which was important to avoid flocculation of the complexes and allow the growth of the silica particles. Stability of the complexes and thus the size of resulting particles were tunable by changing either the positive charges of the complexes or the pre-hydrolyzation time of the Stober system. The optical performance of the silica particles was improved and the leakage of the dye from the particles was greatly suppressed due to the electrostatic interaction between the dye and polyelectrolyte.