TY - JOUR
T1 - Effect of Electric Field on the Hydrodynamic Assembly of Polydisperse and Entangled Fibrillar Suspensions
AU - Brouzet, Christophe
AU - Mittal, Nitesh
AU - Rosén, Tomas
AU - Takeda, Yusuke
AU - Söderberg, L. Daniel
AU - Lundell, Fredrik
AU - Takana, Hidemasa
N1 - Funding Information:
Part of this work was carried out under the JSPS Core-to-Core Program “International research core on smart layered material and structures on energy saving”, JSPS Kakenhi Program (grant # 19K04187), and the International Collaborative Research Project of the Institute of Fluid Science, Tohoku University. The authors sincerely thank Tomoki Nakajima for his technical support on this work.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/7/13
Y1 - 2021/7/13
N2 - Dynamics of colloidal particles can be controlled by the application of electric fields at micrometer-nanometer length scales. Here, an electric field-coupled microfluidic flow-focusing device is designed for investigating the effect of an externally applied alternating current (AC) electric field on the hydrodynamic assembly of cellulose nanofibrils (CNFs). We first discuss how the nanofibrils align parallel to the direction of the applied field without flow. Then, we apply an electric field during hydrodynamic assembly in the microfluidic channel and observe the effects on the mechanical properties of the assembled nanostructures. We further discuss the nanoscale orientational dynamics of the polydisperse and entangled fibrillar suspension of CNFs in the channel. It is shown that electric fields induced with the electrodes locally increase the degree of orientation. However, hydrodynamic alignment is demonstrated to be much more efficient than the electric field for aligning CNFs. The results are useful for understanding the development of the nanostructure when designing high-performance materials with microfluidics in the presence of external stimuli.
AB - Dynamics of colloidal particles can be controlled by the application of electric fields at micrometer-nanometer length scales. Here, an electric field-coupled microfluidic flow-focusing device is designed for investigating the effect of an externally applied alternating current (AC) electric field on the hydrodynamic assembly of cellulose nanofibrils (CNFs). We first discuss how the nanofibrils align parallel to the direction of the applied field without flow. Then, we apply an electric field during hydrodynamic assembly in the microfluidic channel and observe the effects on the mechanical properties of the assembled nanostructures. We further discuss the nanoscale orientational dynamics of the polydisperse and entangled fibrillar suspension of CNFs in the channel. It is shown that electric fields induced with the electrodes locally increase the degree of orientation. However, hydrodynamic alignment is demonstrated to be much more efficient than the electric field for aligning CNFs. The results are useful for understanding the development of the nanostructure when designing high-performance materials with microfluidics in the presence of external stimuli.
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U2 - 10.1021/acs.langmuir.1c01196
DO - 10.1021/acs.langmuir.1c01196
M3 - Article
C2 - 34176263
AN - SCOPUS:85110398273
VL - 37
SP - 8339
EP - 8347
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 27
ER -