Magnetic surfaces and uses thereof
Modified surfaces of the present disclosure include a surface or substrate material, a magnetic field, which may be generated through the use of a magnet placed at a distance beneath the surface or substrate, or placed above the surface or substrate, or through the use of a magnetic surface or substrate, and a magnetic fluid, such as ferrofluid or ferrogel, deposited in a layer on the top of the surface or substrate. The modified surfaces may be icephobic. In addition, a droplet of liquid placed on the modified surface can be manipulated through placement of a local heat source in proximity to the droplet, without contacting the droplet.
1. A method for improving icephobicity of a material, comprising:
depositing a layer of magnetic fluid on a surface of the material, wherein the magnetic fluid is an oil-based ferrofluid; and
placing a magnet in proximity to the surface, wherein the magnet produces a magnetic field that contacts the layer of magnetic fluid, and wherein the magnetic field holds the layer of magnetic fluid on the surface to coat the surface, and wherein the layer of magnetic fluid on the surface of the material improves icephobicity of the material due to immiscibility of water with the layer of magnetic fluid and attraction of the layer of magnetic fluid to the magnet.
2. The method of claim 1 , wherein the magnet is placed above or beneath the surface.
3. The method of claim 1 , wherein the layer of magnetic fluid has a thickness of about 10 nm to about 10 mm.
4. The method of claim 1 , wherein the magnetic field has a strength of about 1 mT to about 10 T.