title: Field-controlled adhesion in confined magnetorheological fluids.
abstract: The study of reversible, functional, and controllable adhesives is a matter of considerable practical interest, and academic research. We report the adhesive response of a magnetorheological fluid confined between two parallel plates under a probe-tack test, when it is subjected to an applied magnetic field. Our analytical approach is based on a Darcy-like law formulation which considers a magnetic field-dependent yield stress behavior. The adhesion force is calculated in closed form for two different configurations produced by a Helmholtz coils setup: uniform perpendicular, and nonuniform radial magnetic fields. In both cases, we verify that adhesion force is hugely increased as a result of the field-dependent nature of the yield stress. This provides a versatile way to obtain a shear resistant, tough structural adhesive through magnetic means.
authors.affiliation: Departamento de Física, LFTC, Universidade Federal de Pernambuco, Recife, PE, Brazil.
authors.forename: Sérgio A
authors.initials: SA
authors.lastname: Lira
authors.forename: José A
authors.initials: JA
authors.lastname: Miranda
mesh_terms: D000268:Adhesiveness; D003198:Computer Simulation; D008280:Magnetics; D008956:Models, Chemical; D012212:Rheology / Q000379:methods*; D012996:Solutions / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D012996:Solutions