论文标题
用于控制和组装磁性微高的实验设计
An experimental design for the control and assembly of magnetic microwheels
论文作者
论文摘要
可以将超磁胶体颗粒可逆地组装成类似的轮毂结构，称为微螺旋（$μ$ wheels），由于摩擦而在表面上滚动，并可以使用旋转磁场以用户控制的速度和方向驱动。在这里，我们描述了创建和控制组装和直接车轮运动的磁场以及可视化它们的磁场的硬件和软件。由可移植性，适应性和低成本的动机，构建了装有高磁通透性核心的开放光学元件和音频扬声器线圈的挤压铝热量框架。开发开源软件是为了定义磁场的幅度，频率和方向，从而可以通过二维（2D）和三维（3D）流体环境对$μ$ Wheels进行实时操纵杆控制。使用硬件和软件的组合，使用0.75-2.5吨磁场的旋转频率为5-40 Hz，$μ$ Wheels的速度最高可达50美元$ $ m/s的样本尺寸，最多可达5 cm x 5 cm x 5 cm。铝线圈夹的热量耗散在环境温度的3 c内保持样品温度，这是有利于生物应用的范围。使用此设计，可以在2D和3D网络中操纵和成像$μ$ Wheels，以毫米的长度尺度到厘米
Superparamagnetic colloidal particles can be reversibly assembled into wheel-like structures called microwheels ($μ$wheels) which roll on surfaces due to friction and can be driven at user-controlled speeds and directions using rotating magnetic fields. Here, we describe the hardware and software to create and control the magnetic fields that assemble and direct wheel motion and the optics to visualize them. Motivated by portability, adaptability and low-cost, an extruded aluminum heat dissipating frame incorporating open optics and audio speaker coils outfitted with high magnetic permeability cores was constructed. Open-source software was developed to define the magnitude, frequency, and orientation of the magnetic field, allowing for real time joystick control of $μ$wheels through two-dimensional (2D) and three-dimensional (3D) fluidic environments. With this combination of hardware and software, $μ$wheels translate at speeds up to 50 $μ$m/s through sample sizes up to 5 cm x 5 cm x 5 cm using 0.75-2.5 mT magnetic fields with rotation frequencies of 5-40 Hz. Heat dissipation by aluminum coil clamps maintained sample temperatures within 3 C of ambient temperature, a range conducive for biological applications. With this design, $μ$wheels can be manipulated and imaged in 2D and 3D networks at length scales of micrometers to centimeters
