磁性纳米粒子

Abstract(#br)We report the development of magnetic nanocomposite sheets with superhydrophobic and supeoleophilic surfaces generated by laser ablation. Polydimethylsiloxane elastomer free-standing films, loaded homogeneously with 2% wt. carbon coated iron nanoparticles, were ablated by UV (248\u003cce:hsp sp=\"0.25\"/\u003enm), nanosecond laser pulses. The laser irradiation induces chemical and structural changes (both in micro- and nano-scale) to the surfaces of the nanocomposites rendering them superhydrophobic.

Abstract(#br)Soft actuators have grown to be a topic of great scientific interest. As the fabrication of soft actuators with conventional microfabrication methods are tedious, expensive, and time consuming, employment of 3-D printing fabrication methods appears promising as they can simplify fabrication and reduce the production cost. Complex structures can be fabricated with 3-D printing such as helical coils that can achieve actuation performances, which otherwise would be impossible with simpler geometries.

本工作表明，沉积在聚二甲基硅氧烷( PDMS )基底上的Ni-P薄膜可以影响金修饰磁性纳米颗粒( Fe3O4 / AuNPs )的磁团聚，提高其在表面增强拉曼散射( SERS )检测中的性能。采用简单、低成本的化学沉积工艺在PDMS ( PDMS-Ni-P )上沉积Ni-P薄膜。将PDMS-Ni-P基底与NdFeB永磁体结合，实现了Fe3O4 / AuNPs的团聚，对结晶紫的SERS信号比单独使用磁体团聚纳米颗粒的SERS信号提高了3个数量级。此外，使用PDMS-Ni-P基底对腺嘌呤和噻苯达唑的SERS信号也进行了改进，检出限分别为1.65和0.24 mg L-1。