Magnetically responsive dry fluids

authors	Sousa, FL; Bustamante, R; Millan, A; Palacio, F; Trindade, T; Silva, NJO
nationality	International
journal	NANOSCALE
keywords	WATER; NANOPARTICLES; EMULSIONS; PARTICLES; FOAMS
abstract	Ferrofluids and dry magnetic particles are two separate classes of magnetic materials with specific niche applications, mainly due to their distinct viscosity and interparticle distances. For practical applications, the stability of these two properties is highly desirable but hard to achieve. Conceptually, a possible solution to this problem would be encapsulating the magnetic particles but keeping them free to rotate inside a capsule with constant interparticle distances and thus shielded from changes in the viscosity of the surrounding media. Here we present an example of such materials by the encapsulation of magnetic ferrofluids into highly hydrophobic silica, leading to the formation of dry ferrofluids, i.e., a material behaving macroscopically as a dry powder but locally as a ferrofluid where magnetic nanoparticles are free to rotate in the liquid.
publisher	ROYAL SOC CHEMISTRY
issn	2040-3364
year published	2013
volume	5
issue	16
beginning page	7229
ending page	7233
digital object identifier (doi)	10.1039/c3nr01784b
web of science category	Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
subject category	Chemistry; Science & Technology - Other Topics; Materials Science; Physics
unique article identifier	WOS:000322315600015