Microrheology of magnetorheological silicone elastomers during curing process under the presence of magnetic field

Abstract

A microrheological method is employed for the first time to continuously and undisturbedly monitor variations of viscoelasticity of magnetorheological elastomers (MREs) based on silica-coated carbonyl iron particles (SiCIPs)-filled silicone during the curing process. Results indicate that the elasticity of MREs dramatically increases with increasing magnetic field intensity, which is much more significant in comparison with the slow process of silicone curing at 25 % and 40 % SiCIPs. The formations of chain-like structure of SiCIPs and cured network of silicone are recognized, both contributing to the rheology of MREs, suggesting the possibility of developing a facile method for adjusting the rheology and fixing the structure of a wide range of MREs by applying magnetic field during the curing of matrix.

Magnetorheology: a review

“…Traditionally, Scanning Electron Micrographs (SEM) on MRE cutting planes are used to get information about particle structure and interfacial adhesion. 287 More recent approaches involve the use of microrheology to monitor MREs curation process in real time 288 and Atomic Force Microscopy (AFM), Magnetic Force Microscopy (MFM), Force/Distance (F/D) spectroscopy and nanoindentation to obtain information at the surface of the specimen. 289 Undoubtedly, a major breakthrough during the last ten years is the use of XlCT to evaluate interfacial adhesion and structuration in MREs.…”

Magnetorheological elastomer peristaltic pump capable of flow and viscosity control

“…In the numerical study, the magneto-fluid–solid interaction (MFSI) should be elucidated first. The magnetization curve (Wu et al, 2017; 2019a; 2019b) and Mooney–Rivlin model (Sun et al, 2014; Yang et al, 2017; Yu and Zhao, 2009) are utilized to represent magnetic-induced body force, and the equilibrium and constitutive equations of a mass point in MRE domain are written as follows…”

Magnetorheological elastomer peristaltic fluid conveying system for non-Newtonian fluids with an analogic moisture loss process

“…In the numerical study, the magnetization curve (Chen et al, 2007, 2008; Khoo and Liu, 2001; Wu et al, 2017; Xu et al, 2011), Mooney–Rivlin model (Sun et al, 2014), and Carreau model (Kutev et al, 2015) are employed to characterize the magnetism of the MRE, the constitutive equations of the MRE, and the rate-dependent viscosity of the conveying fluids (a solution of linear polystyrene in 1-chloronaphthalene), respectively. The fluid transport performance of the MRE-PFCS is decided on the interaction among the generated fluid pressure, viscous force, and the deformation of the inner walls of the MRE tube.…”

“…Nevertheless, these MRE pumps with valves are only capable of conveying fluids unidirectionally and exhibit intricate structures. The magnetic property of MREs is simplified by a constant relative magnetic permeability (Chen et al, 2007, 2008; Khoo and Liu, 2001; Wu et al, 2017; Xu et al, 2011). We develop a two-dimensional (2D) model of a smart MRE peristaltic pump with a magnetization curve for blood conveying, allowing bidirectional fluid transportation (Wu et al, 2019).…”