Laser-induced fragmentation of carbonyl iron as a clean method to enhance magnetorheological effect. (1st May 2020)

• Record Type: Journal Article
• Authors: Cvek, Martin; Torres-Mendieta, Rafael; Havelka, Ondrej; Urbanek, Michal; Plachy, Tomas; Cernik, Miroslav
• Is Part Of: Journal of cleaner production. Volume 254(2020)
• Publication Date: 2020-05-01
• Subjects: Magnetorheology -- Nanoparticle fabrication -- Laser fragmentation in liquids -- Magnetism -- Suspension -- Additive; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.120182
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Magnetic nanoparticles (NPs) are widely used as additives in magnetorheological (MR) suspensions to enhance their magnetic performance and kinetic stability. The synthesis of NPs is often resolved via chemical routes or complex manufacturing procedures, which require hazardous chemicals and generate waste products. In this study, a clean, laser-mediated strategy known as laser fragmentation in liquids (LFL) is proposed that enables the synthesis of NP-based additives directly from the given MR suspension, with the added advantage of limiting the production of waste during the fabrication process. The carbonyl iron (CI) microparticles dispersed in ethylene glycol were used as both the MR suspension and precursor agent in the production of the nanoscale additive. The size and crystalline structure of the NPs were investigated via TEM and XRD, respectively. The mixture of the MR suspension and laser-synthesized additive notably facilitated the magnetisation of the CI particles, incrementing the MR characteristics and dynamic yield stress values by up to 31% in a low-to-moderate field region, which are important aspects in various field-controlled robotic, damping and torque systems. The concept presented appears to be an effective and clean alternative for fabricating bidispersed MR suspensions through the nanoscale additive approach. Graphical abstract: Image 1 Highlights: Magnetorheological (MR) suspensions are enhanced using a nanoparticle (NP) additive. The NP additive is synthesized from the MR suspension without producing any waste. MR performance is enhanced in low-to-moderate magnetic field region. Laser-induced NP production constitutes a clean option for improving smart fluids.