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Ferrofluidic seals rely on the general principle of ferrofluids - fluids that display magnetic attraction.Following research on ferrofluids during the 1960s, the ferrofluidic seal was first patented in 1971 by R.E. Rosensweig (USP 3,620,584), who subsequently founded Ferrofluidics Corporation with R. Moskowitz.
With ferrofluids, energy harvester designs no longer need solid structure. One example of ferrofluid based energy harvesting is to place the ferrofluid inside a container to use external mechanical vibrations to generate electricity inside a coil wrapped around the container surrounded by a permanent magnet. [ 40 ]
The company XeelTech and CK Materials Lab in Korea use magnetorheological fluid to generate the haptic feedback of their HAPTICORE rotary switches. The MR actuators are primarily used as input devices with adaptive haptic feedback to enable new possibilities in user interface design. The HAPTICORE technology functions like a miniature MR brake.
Caulk (also known as caulking and calking) [1] is a material used to seal joints or seams against leakage in various structures and piping. The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on wooden boats or ships. Cast iron sewerage pipes were formerly caulked in a similar way.
Bis-GMA (bisphenol A-glycidyl methacrylate) is a resin commonly used in dental composite, dental sealants. [1] [2] and dental cement. It is the diester derived from methacrylic acid and the bisphenol A diglycidyl ether. Bearing two polymerizable groups, it is prone to form a crosslinked polymer that is used in dental restorations. [3]
Structure of the backbone of a cyanoacrylate polymer. Cyanoacrylates are a family of strong fast-acting adhesives with industrial, medical, and household uses. They are derived from ethyl cyanoacrylate and related esters. The cyanoacrylate group in the monomer rapidly polymerizes in the presence of water to form long, strong chains. [1]
Iron(II) fluoride or ferrous fluoride is an inorganic compound with the molecular formula FeF 2. It forms a tetrahydrate FeF 2 ·4H 2 O that is often referred to by the same names. The anhydrous and hydrated forms are white crystalline solids.
This is accomplished by using a material that enables the easy removal of favorable interactions at the adhesive-backing or adhesive-adhesive interface, or by making both surfaces immiscible in one another. Two common materials used in polyacrylate-based adhesive tapes are fluorosilicones [9] and vinyl carbamates. [6]