The effect of the green additive guar gum on the properties of magnetorheological fluid

Abstract

Magnetorheological (MR) fluid containing guar gum was prepared for the first time by ball-milling the guar gum powder together with silicone oil and carbonyl iron powder. By forming a coating layer over the ground carbonyl iron powder, the guar gum improves the sedimentation stability and thixotropy of the MR fluid effectively.

Reduced aggregation and sedimentation of zero-valent iron nanoparticles in the presence of guar gum

“…Data were captured and analyzed using the software package ASTRA, and the molecular weight was determined by solving the equation that relates the excess scattered light, measured at several angles, to the concentration of solute and the weight-average molar mass. Trial runs were conducted on dextran (35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45) from Sigma prior to the experiments to test the system's performance.…”

“…Guar gum is already being used to support the excavation walls for zero-valent iron permeable reactive barriers, where enzymes are then injected for its breakdown [2]. Recent studies have reported the effectiveness of guar gum in enhancing the sedimentation stability of magnetorheological fluids [37,38].…”

Challenges in Groundwater Remediation with Iron Nanoparticles: Enabling Colloidal Stability

“…Guar gum is already in use as a dispersing and stabilizing agent for many industrial applications (Bradley et al, 1989;Wang et al, 2000). It is also being investigated using stability enhancement experiments involving magnetorheological fluids (Fang et al, 2005;Wu et al, 2006). Its low cost and "green" attributes are appealing in a nanoparticle dispersant (Tiraferri et al, 2008).…”

Optimal Design Methodology of Magnetorheological Fluid Based Mechanisms

“…The possible maximum yield stress induced by MR effect is mainly determined by the lowest coercivity and the highest magnitude of saturation magnetization of the dispersed particles. Therefore, soft magnetic material with high purity such as carbonyl iron powder appears to be the main magnetic phase for most of the practical MRF composition [3]. Other than carbonyl iron, Fe-Co alloys and Fe-Ni alloys can also be used as MR materials, whereby, Fe contributes to the high saturation magnetization.…”