Jellicoe Matt, Gardner Zoe, Alotaibi Amjad E H, Shoemaker Kaylee E, Scott James M, Wang Shiliang, Alotaibi Badriah M, Luo Xuan, Chuah Clarence, Gibson Christopher T, He Shan, Vimalanathan Kasturi, Gascooke Jason R, Chen Xianjue, Rodger Alison, Huang Han, Dalgarno Scott J, Antunes Elsa, Weiss Gregory A, Li Qin, Quinton Jamie S, Raston Colin L
Flinders Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, SA, 5042, Australia.
Department of Chemistry, University of California, Irvine, CA, 92697-2025, USA.
Small. 2025 May;21(20):e2409807. doi: 10.1002/smll.202409807. Epub 2025 Apr 3.
High shear spinning top (ST) typhoon-like fluid flow in a rapidly rotating inclined tube within a vortex fluidic device (VFD) approaches homochirality throughout the liquid with toroids of bundled single-walled carbon nanotubes (SWCNTs) twisted into stable chiral lemniscates (in the shape of Figure 8s), predominantly as the R-or S-structures, for the tube rotating clockwise (CW) or counterclockwise (CCW). However, this is impacted by the Earth's magnetic field (B). Theory predicts 1-20 MPa pressure for their formation, with their absolute chirality determined from scanning electron microscopy (SEM) and atomic force microscopy (AFM) images. Thus, the resultant lemniscate structures establish the absolute chirality of the inner and outer components of the ST flow. These chiral flows and lemniscates can be flipped to the opposite chirality by changing the orientation of the tube relative to the inclination angle of B, by moving the geographical location. Special conditions prevail where the tangential angle of the outer and inner flow of the ST becomes periodically aligned with B, which respectively dramatically reduce the formation of toroids (and thus lemniscates) and formation of lemniscates from the toroids formed by the double-helical (DH) flow generated by side wall Coriolis forces and Faraday waves.
在涡旋流体装置（VFD）中快速旋转的倾斜管内，高剪切纺丝顶（ST）类台风流体流动在整个液体中接近同手性，其中成束的单壁碳纳米管（SWCNT）的环面扭曲成稳定的手性lemniscates（呈图8s的形状），当管子顺时针（CW）或逆时针（CCW）旋转时，主要为R-或S-结构。然而，这会受到地球磁场（B）的影响。理论预测其形成时的压力为1 - 20兆帕，其绝对手性由扫描电子显微镜（SEM）和原子力显微镜（AFM）图像确定。因此，所得的lemniscate结构确定了ST流内部和外部组分的绝对手性。通过改变管子相对于B倾斜角的方向、移动地理位置，这些手性流和lemniscates可以翻转成相反的手性。在特殊条件下，ST内外部流的切向角会与B周期性对齐，这分别会显著减少环面（进而减少lemniscates）的形成以及由侧壁科里奥利力和法拉第波产生的双螺旋（DH）流形成的环面所形成的lemniscates的形成。
