Liu Hui, Wang Caiqin, Wang Peixi, Liu Nan, Du Qingfeng
School of Public Health, Lanzhou University, Lanzhou, China.
General Practice Center, Nanhai Hospital, Southern Medical University, Foshan, China.
Front Chem. 2019 Feb 1;7:26. doi: 10.3389/fchem.2019.00026. eCollection 2019.
Extremely stable and biocompatible 3D magnetically responsive photonic crystals (MRPCs) are successfully prepared in aqueous solution. Classic hydrothermal synthesis was applied for preparation of the FeO@C core. Modified Stöber method was then employed for synthesis of the different size of FeO@C@SiO. Unlike the traditional magnetic nanoparticles, the highly negative charged superparamagnetic nanospheres (SMNs), i.e., the double-shell structure FeO@C@SiO are capable of rapidly self-assembling into 3D MRPCs with full visible and various colors that can be periodically and reversibly tuned under different kinds of external magnetic fields (EMFs) within 1 s. The assembling behavior and mechanism of the 3D MRPCs under EMF were monitored and analyzed. The preparation is simple and the size of the SMN is easily controllable by adjusting the amount of catalyst. Compared with the previous works, the synthesized 3D MRPCs are hydrophilic, and exhibit extremely high stability after 6-month storage. To conclude, our study provides an effective two-step strategy for fabrication of biocompatible 3D MRPCs and it reveals great potentials in biological fields.
在水溶液中成功制备了极其稳定且具有生物相容性的三维磁响应光子晶体（MRPCs）。采用经典水热合成法制备FeO@C核。然后采用改进的Stöber法合成不同尺寸的FeO@C@SiO。与传统磁性纳米颗粒不同，高负电荷的超顺磁性纳米球（SMNs），即双壳结构的FeO@C@SiO，能够在1秒内迅速自组装成具有全可见光和各种颜色的三维MRPCs，这些颜色在不同类型的外部磁场（EMFs）下可以周期性且可逆地调节。监测并分析了三维MRPCs在EMF下的组装行为和机制。该制备方法简单，通过调节催化剂用量可轻松控制SMN的尺寸。与之前的工作相比，合成的三维MRPCs具有亲水性，储存6个月后仍表现出极高的稳定性。总之，我们的研究为制备生物相容性三维MRPCs提供了一种有效的两步策略，并揭示了其在生物领域的巨大潜力。
