铁磁流体

Abstract(#br)We print complex curvilinear microstructures in an elastomer matrix using a ferrofluid droplet as the print head. A magnetic field moves the droplet along a prescribed path in liquid polydimethylsiloxane (PDMS). The droplet sheds magnetic nanoparticle (MNP) clusters in its wake, forming printed features. The PDMS is subsequently heated so that it crosslinks, which preserves the printed features in the elastomer matrix.

Stimuli-responsive materials undergo physicochemical, and/or structural changes when a specific actuation is applied. They are heterogeneous composites, consisting of a non-responsive matrix where functionality is provided by the filler. Surprisingly, the synthesis of Polydimethylsiloxane (PDMS)-based stimuli-responsive elastomers (SRE) has seldomly been presented. Here we present the structural, biological, optical, magnetic and mechanical properties of several magnetic SRE (M-SRE) obtained by combining PDMS and isoparafin-based ferrofluid (FF).

利用电永磁体改变流聚焦结中磁流体油相的粘度，演示了一种新型的磁流体液滴发生器，可实现对水滴尺寸的控制。电永磁体具有快速开关能力( \u003c 100μ \\ document class [ 12pt ] { minimal \\ use package { amsmath } { isysym } { amsfonts } { amssymb } { amsbsy } { mathrsfs } { use package { upgreek } { set length {奇边缘} { -69pt } { start { document } $$\\upmu$$ { end { document } s )，具有与永磁体相当的磁场强度。开启时，磁粘效应增加了磁流体的粘度，从而增加了通道的流体阻力，减缓了油基相的流速，改变了液滴直径。我们已经演示了在足够快的速度下，按需调节液滴尺寸高达44 %，足以调节流中单个液滴的尺寸。由于供应管和聚二甲基硅氧烷( PDMS )微流控通道的柔顺性，液滴尺寸的变化以秒为时间尺度放松。通过集成一个基于被动尺寸的磁液滴分选阶段，演示了液滴尺寸调制的应用。