Structural change and dynamics of colloidal gels under oscillatory shear flow
2015 · Soft Matter
저자
June Dong Park, 안경현 (Kyung Hyun Ahn), Seung Jong Lee
연구주제
Rheology and Fluid Dynamics Studies · Material Dynamics and Properties
NTIS 과학기술표준분류
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AI 연구 키워드·방법
콜로이드 겔 gel network structure oscillatory shear flow
키워드 (OpenAlex)
colloidal gels oscillatory shear small amplitude oscillatory shear large amplitude oscillatory shear network structure Bond number elastic stress linear viscoelasticity
초록
The dynamics and rheological behavior of colloidal gels under oscillatory shear flow have been studied by using the Brownian dynamics simulations. The dynamics is studied under the oscillatory shear of small, medium, and large amplitudes. In the small amplitude oscillatory shear (SAOS) regime, the colloidal gel retains a rigid-chain network structure. The colloidal gel oscillates with small structural fluctuations and the elastic stress shows a linear viscoelastic response. In the medium amplitude oscillatory shear (MAOS) regime, the rigid network structure is ruptured, and a negative correlation between the absolute value of strain and the average bond number is observed. The elastic stress shows a transient behavior in between the SAOS and LAOS responses. In the large amplitude oscillatory shear (LAOS) regime, the colloidal gel shows a soft chain structure. Contrary to the negative cor…
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연구주제 1
Rheology and Fluid Dynamics Studies