Abstract
Introduction
Nanofiber orientation in suspensions determines the performance of nanoparticle suspensions which have potential applications in intelligent control.
Material and method
Na2Ti3O7 nanofibers were prepared with a hydrothermal method. The orientation degree of Na2Ti3O7 nanofibers in silicone oil has been studied by in situ small-angle X-ray scattering technique. Thünemann–Ruland method was used to extract the distribution widths of Na2Ti3O7 nanofibers in the suspensions.
Conclution
An empirical formula has been proposed to describe the dependence of nanofiber orientation degree on the external electric-field strength (E) and the nanofiber concentration (C). The results demonstrate that the response of nanofiber orientation to the electric field can be divided into exponential and linear stages before and after the inflection point of electric-field strength (Ec = 0.09 kV/mm). Low concentration of suspension is more sensitive to the external electric field. The increase in nanofiber concentration will decrease the response sensitivity of nanofiber orientation degree to the change of E. The critical concentration of Na2Ti3O7 nanofibers in the suspension is about 5 wt%. This study is expected to give new clue for the structurally responsive mechanism of anisotropic nanoparticles in suspensions to electric-field strength and particle concentration.
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Acknowledgements
This work is supported by the Ministry of Science and Technology of China (Grant No. 2017YFA0403000) and the National Natural Science Foundation of China (Grant No. 11405199).
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Wang, J., Zhao, X., Liu, Y. et al. Small-angle X-ray scattering study on the orientation of suspended sodium titanate nanofiber induced by applied electric field. Radiat Detect Technol Methods 3, 36 (2019). https://doi.org/10.1007/s41605-019-0118-y
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DOI: https://doi.org/10.1007/s41605-019-0118-y