毛细管流MRI:在复杂分散中量化微观合作性
Klaudia W Milc1, Thomas Oerther2, Joshua A Dijksman3,4
1Laboratory of Biophysics, Wageningen University, 6708 WE Wageningen, The Netherlands.
Analytical chemistry
|October 5, 2023
概括
一个新的磁共振成像 (MRI) 速度测量平台精确地测量了受限复杂流体中的流量. 这项技术准确地量化了3D打印和化品中使用的材料中的粒子相互作用和流动行为.
科学领域:
- 流体动力学 流体动力学
- 生物物理学的生物物理.
- 材料科学 材料科学 材料科学
背景情况:
- 在3D打印和化品等应用中,有限的颗粒液体流量至关重要.
- 预测复杂流体中的合作流需要用于光学不透明介质的先进成像技术.
研究的目的:
- 开发一种高分辨率,压力驱动的磁共振成像 (MRI) 速度测量平台,用于局部分析受限复杂流体的流量.
- 在各种复杂的流体系统中量化合作流现象和非局部粒子相互作用.
主要方法:
- 一个压力驱动的MRI速度测量平台是使用压力控制器和具有可调壁性能和直径 (100-540μm) 的毛细血管开发的.
- 高空间分辨率 (9微米) 允许量化流合作长度尺度 (ξ) 到15微米的卡博波尔和脂肪晶体分散 (FCD).
主要成果:
- 该平台在Carbopol (颗粒大小d ~ 2μm) 中量化流合作长度尺度时实现了13%的准确性.
- 对于 Carbopol, ξ 是独立于流量条件的;对于 FCD, ξ 随着间隙大小和压力 (0.25-1 bar) 的增加而增加.
- 非局部相互作用涉及2-8个粒子,较小的域在较高的限制下占主导地位.
结论:
- 开发的流动MRI平台是研究受限复杂流体动态的多功能工具.
- 该平台对超高场的可扩展性为化学分辨速度测量和3D打印和体外研究中的应用提供了潜力.
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