Microfluidic magnetic switching valves based on aggregates of magnetic nanoparticles: Effects of aggregate length and nanoparticle sizes

Simple item page
dc.contributor.authorJiemsakul, Thanakorn
dc.contributor.authorManakasettharn, Supone
dc.contributor.authorKanharattanachai, Sivakorn
dc.contributor.authorWanna, Yongyuth
dc.contributor.authorWangsuya, Sujint
dc.contributor.authorPratontep, Sirapat
dc.date.accessioned2026-08-06T10:15:52Z
dc.date.available2026-08-06T10:15:52Z
dc.date.issued2017-01-15
dc.description.abstractWe demonstrate microfluidic switching valves using magnetic nanoparticles blended within the working fluid as an alternative microfluidic flow control in microchannels. Y-shaped microchannels have been fabricated by using a CO<inf>2</inf> laser cutter to pattern microchannels on transparent poly(methyl methacrylate) (PMMA) sheets covered with thermally bonded transparent polyvinyl chloride (PVC) sheets. To examine the performance of the microfluidic magnetic switching valves, an aqueous magnetic nanoparticle suspension was injected into the microchannels by a syringe pump. Neodymium magnets were then employed to attract magnetic nanoparticles and form an aggregate that blocked the microchannels at a required position. We have found that the maximum volumetric flow rate of the syringe pump that the magnetic nanoparticle aggregate can withstand scales with the square of the external magnetic flux density. The viscosity of the fluid exhibits dependent on the aggregate length and the size of the magnetic nanoparticles. This microfluidic switching valve based on aggregates of magnetic nanoparticles has strong potentials as an on-demand flow control, which may help simplifying microfluidic channel designs.
dc.identifier.citationJournal of Magnetism and Magnetic Materials, 422, 434-439, 2017
dc.identifier.doi10.1016/j.jmmm.2016.09.040
dc.identifier.issn03048853
dc.identifier.other2-s2.0-84987956581
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/7441
dc.sourceJournal of Magnetism and Magnetic Materials
dc.subjectAggregates of magnetic nanoparticles
dc.subjectMagnetic nanoparticles
dc.subjectMicrochannels
dc.subjectMicrofluidic magnetic switching valves
dc.subjectMicrofluidics
dc.subjectSPIONs
dc.titleMicrofluidic magnetic switching valves based on aggregates of magnetic nanoparticles: Effects of aggregate length and nanoparticle sizes
dc.typeArticle

Files

Collections

Research