光热驱动PS-PS@PDA偏心纳米马达的制备及运动性能研究

Preparation of Photothermal-Driven PS-PS@PDA Eccentric Nanomotors and Study on Their Motion Behavior

以聚苯乙烯(PS)纳米颗粒为模板,通过模板法制备了一种光热驱动聚苯乙烯-聚苯乙烯@聚多巴胺(PS-PS@PDA)偏心纳米马达,利用扫描电子显微镜、透射电子显微镜对其形貌结构进行了表征,并评价了其光热性能和运动性能。结果表明,PS-PS@PDA偏心纳米马达由1个挤出的PS小球和1个核壳结构PS@PDA大球组成,直径分别为(134.7±12.4)nm和(229.3±6.5)nm;在近红外激光照射下,纳米马达表现出良好的光热转换性能和光热稳定性;随着激光功率密度的增加,纳米马达的扩散系数逐渐增大,当功率密度为2.0 W·cm^(-2)时,扩散系数达到15.57μm^(2)·s^(-1),比布朗运动的扩散系数提高了约32倍;此外,纳米马达在不同的生物介质中依然能够维持高效驱动。

Taking polystyrene(PS)nanoparticles as a template,we prepared photothermal-driven polystyrene-polystyrene@polydopamine(PS-PS@PDA)eccentric nanomotors by using a template method.Moreover,we characterized the morphology by scanning electron microscopy and transmission electron microscopy,and evaluated the photothermal performance and motion performance.The results show that PS-PS@PDA eccentric nanomotor consists of a small extruded PS pellet and a large core-shell PS@PDA with the diameter of(134.7±12.4)nm and(229.3±6.5)nm,respectively.The nanomotor exhibits good photothermal conversion performance and photothermal stability under near-infrared light irradiation.With the increase of the laser power density,the diffusion coefficient of the nanomoter increases gradually.When the power density is 2.0 W·cm^(-2),the diffusion coefficient reaches 15.57μm^(2)·s^(-1),which is about 32 times higher than that of Brownian motion.In addition,the nanomotor can still maintain efficient movement in various biological media.