由聚合物枯竭引起的可逆微轮转换
Aaron K Ishiki1, Keith B Neeves2,3, David W M Marr1
1Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States.
Langmuir : the ACS journal of surfaces and colloids
|October 25, 2023
概括
微观机器人 (μbots) 可以从磁粒子组装起来,并沿着表面推进. 流体中的高分子量聚合物可以通过改变局部粘度来逆转μbot方向.
科学领域:
- 软物质物理学 软物质物理学
- 微型机器人技术的发展
- 结合体科学 结合体科学
背景情况:
- 微观机器人 (μbots) 需要在体内应用的运动性,其设计类似于螺旋式游泳器,可以通过散装液体进行翻译.
- 此前,我们已经证明了超偏磁性合性颗粒的可逆组装成微机器人,这些微机器人通过在旋转磁场下通过湿摩擦沿着表面转换.
研究的目的:
- 研究高分子量聚合物对微机器人 (μbots) 表面运输的影响.
- 确定聚合物排除及其对局部粘度的影响如何影响μbot运动和相互作用.
主要方法:
- 在水性系统中利用丹作为模型高分子量聚合物.
- 应用旋转磁场来组装和激活超偏磁性合体颗粒成为μbots.
- 分析了沿表面的μbot转换,重点关注聚合物耗尽和局部粘度变化的影响.
主要成果:
- 高分子量聚合物,接近微机器人表面间隙大小,被排除在界面之外.
- 聚合物耗尽对合物表面相互作用的影响很弱,但对局部粘度有显著影响.
- 局部粘度的变化足以引起μbot转换方向的逆转.
结论:
- 高分子量聚合物的存在可以严重影响微机器人 (μbot) 沿着表面的运输动态.
- 通过聚合物枯竭进行局部粘度调节是一个关键因素,超过了直接的表面相互作用效应.
- 这一发现对于控制复杂生物环境中的微机器人导航至关重要.
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