Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals

被引:20
|
作者
Wychowaniec, Jacek K. [1 ,2 ,3 ]
Iliut, Maria [2 ]
Borek, Bartlomiej [4 ]
Muryn, Christopher [5 ,6 ]
Mykhaylyk, Oleksandr O. [7 ]
Edmondson, Steve [2 ]
Vijayaraghavan, Aravind [2 ,8 ]
机构
[1] Univ Manchester, Manchester Inst Biotechnol, Manchester M13 9PL, Lancs, England
[2] Univ Manchester, Dept Mat, Manchester M13 9PL, Lancs, England
[3] Univ Coll Dublin, Sch Chem, Dublin 4, Dublin, Ireland
[4] RHL Serv, Ul Budziszynska 74, PL-60179 Poznan, Poland
[5] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England
[6] Univ Manchester, Photon Sci Inst, Manchester M13 9PL, Lancs, England
[7] Univ Sheffield, Dept Chem, Soft Matter Analyt Lab, Sheffield S3 7HF, S Yorkshire, England
[8] Univ Manchester, Natl Graphene Inst, Manchester M13 9PL, Lancs, England
基金
英国工程与自然科学研究理事会;
关键词
OLDROYD-B FLUID; MOLECULAR THEORY; ALIGNMENT; RHEOLOGY; DISPERSIONS; ORIENTATION; PARTICLES;
D O I
10.1038/s41699-020-00193-x
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Graphene oxide (GO) forms a well-aligned lyotropic liquid crystal (LC) phase in aqueous dispersions at relatively low concentrations. Under a remarkably wide range of shear rates, we report hitherto unobserved shear-induced polarized light image patterns, a Maltese cross combined with shear banding, recorded in real time and in situ during rheological measurements. This is shown to be a result of elastic flow instabilities that manifest as a helical flow in alternating bands of left- and right-handed helices, arising from a combination of shear flow and Taylor-type vortex flow. The instability is observed for LCs formed from large aspect ratio GO particles owing to their unique viscoelastic properties, but not for smaller aspect ratio particles. This phenomenon coincides with rheopecty and anomalous small-angle X-ray scattering patterns under shear flow, which confirm the instabilities. The results presented here could lead to advanced control over macroscopic periodic alignment in technologically relevant dispersions of two-dimensional material particles.
引用
收藏
页数:10
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