磁性薄膜

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.

文摘( # br )报道了在聚二甲基硅氧烷( PDMS )膜上生长的褶皱Ni81Fe19 ( NiFe )薄膜的表面形貌和磁各向异性的研究。由于磁性膜层与弹性体PDMS基体弹性模量相差较大，在单轴预应变PDMS上生长的NiFe薄膜呈现一维( 1D )褶皱结构，沿褶皱方向呈现单轴磁各向异性( UMA )。相比之下，在双轴预应变PDMS上生长的NiFe薄膜表现出二维( 2D )锯齿状褶皱的表面形貌，以及由双轴预应力释放顺序决定方向的UMA。一维和二维皱纹NiFe薄膜的峰间距离和波浪状形貌的振幅均随着预应变的提高而减小和增大。褶皱NiFe薄膜的UMA起源于磁场作用时在波状形貌上产生的磁荷的表面效应。