US2006019096A1PendingUtilityA1

Field-responsive superparamagnetic composite nanofibers and methods of use thereof

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Individually held — no corporate assignee on recordPriority: Jun 1, 2004Filed: Jun 1, 2005Published: Jan 26, 2006
Est. expiryJun 1, 2024(expired)· nominal 20-yr term from priority
Inventors:T. Alan HattonGregory C. RutledgeHarpreet SinghMao-Chin Wang
D01F 6/14D01D 5/0038Y10T428/2913D01F 6/16D01D 5/0007D01F 1/10
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Claims

Abstract

The present invention relates to magnetic field-responsive fibers, which comprise magnetite particles and a polymeric matrix. The invention also provides methods of producing the same, in particular via electrospinning of a stably dispersed or monodispersed polymer solution, either aqueous or organic, comprising the magnetite particles, and applications thereof.

Claims

exact text as granted — not AI-modified
1 . A superparamagnetic fiber comprising magnetite particles and a polymeric matrix.  
   
   
       2 . The superparamagnetic fiber of  claim 1 , wherein said fiber is a nanofiber.  
   
   
       3 . The superparamagnetic fiber of  claim 2 , wherein said nanofiber is less than 500 nm in diameter.  
   
   
       4 . The superparamagnetic fiber of  claim 2 , wherein said nanofiber diameter ranges -from 10 nm-1 μm.  
   
   
       5 . The superparamagnetic fiber of  claim 1 , wherein said matrix comprises polyethylene oxide, polyvinyl alcohol or a combination thereof.  
   
   
       6 . The superparamagnetic fiber of  claim 1 , wherein said polymeric matrix comprises a polysaccharide, an oligosaccharide, a surfactant, a polyethylene glycol, a lignosulfonate, a polyacrylamide, a polypropylene oxide, a cellulose derivative a polyacrylic acid or a combination thereof.  
   
   
       7 . The superparamagnetic fiber of  claim 1 , wherein said polymeric matrix comprises any polymer that can be electrospun from solution.  
   
   
       8 . The superparamagnetic fiber of  claim 1 , wherein said superparamagnetic fiber is magnetic field-responsive.  
   
   
       9 . The superparamagnetic fiber of  claim 1 , wherein said magnetite nanoparticles are stably dispersed within said polymeric matrix.  
   
   
       10 . A device or apparatus comprising the superparamagnetic fiber of  claim 1 .  
   
   
       11 . The device or apparatus of  claim 10 , wherein said device or apparatus is used as a filter or a sensor.  
   
   
       12 . The device or apparatus of  claim 10 , wherein said device or apparatus is used for information storage.  
   
   
       13 . The device or apparatus of  claim 10 , wherein said device or apparatus is used for magnetic imaging.  
   
   
       14 . The device or apparatus of  claim 10 , wherein said device or apparatus is used for magnetic shielding.  
   
   
       15 . The device or apparatus of  claim 10 , wherein said device or apparatus is used as a tunable mechanical reinforcement component in a composite  
   
   
       16 . The device or apparatus of  claim 10 , wherein said device or apparatus is used as a piezomagnetic transducer  
   
   
       17 . A fabric comprising the superparamagnetic fiber of  claim 1 , wherein said fabric may be woven or nonwoven.  
   
   
       18 . A field-responsive fiber comprising ferromagnetic nanoparticles and an organic polymeric matrix.  
   
   
       19 . The fiber of  claim 18 , wherein said fiber is a nanofiber.  
   
   
       20 . The fiber of  claim 19 , wherein said nanofiber has a diameter ranging from 10-500 nm.  
   
   
       21 . The fiber of  claim 18 , wherein said matrix comprises polymethyl methacrylate.  
   
   
       22 . The fiber of  claim 18 , wherein said nanoparticles are monodispersed within said polymeric matrix.  
   
   
       23 . The fiber of  claim 18 , wherein said fiber has a high saturation magnetization, ranging from 250 kA/m to 2000 kA/m.  
   
   
       24 . The fiber of  claim 18 , wherein said fiber has a tunable Nèel relaxation time which ranges from 2 milliseconds to 4 seconds.  
   
   
       25 . The fiber of  claim 24 , wherein said tunable Nèel relaxation time is a function of nanoparticle size.  
   
   
       26 . A device, apparatus or fabric comprising the fiber of  claim 18 .  
   
   
       27 . A method of producing a field-responsive fiber comprising magnetite particles and a polymeric matrix, the method comprising the step of electrospinning a polymer solution comprising magnetic nanoarticles.  
   
   
       28 . The method of  claim 27 , wherein said field-responsive fiber is a nanofiber.  
   
   
       29 . The method of  claim 27 , wherein said nanofiber is less than 500 nm in diameter.  
   
   
       30 . The method of  claim 29 , wherein said nanofiber diameter ranges from 10 nm-1 μm.  
   
   
       31 . The method of  claim 27 , wherein said field-responsive fiber is superparamagnetic.  
   
   
       32 . The method of  claim 31 , wherein said polymer solution comprises polyethylene oxide.  
   
   
       33 . The method of  claim 32 , wherein said polyethylene oxide is at a concentration of between 1% and 3% by weight.  
   
   
       34 . The method of  claim 33 , wherein said polymer solution has a conductivity of between 0.1 and 10000 μS/cm.  
   
   
       35 . The method of  claim 31 , wherein said polymer solution comprises polyvinyl alcohol.  
   
   
       36 . The method of  claim 35 , wherein said polyvinyl alcohol is at a concentration of between 6.5% and 15% by weight.  
   
   
       37 . The method of  claim 31 , wherein said polymer solution comprises SDS.  
   
   
       38 . The method of  claim 31 , wherein said polymer solution comprises a polysaccharide, an oligosaccharide, a surfactant, a polyethylene glycol, a lignosulfonate, a polyacrylamide, a polypropylene oxide, a cellulose derivative a polyacrylic acid or a combination thereof.  
   
   
       39 . The method of  claim 31 , wherein said polymer solution is an aqueous solution.  
   
   
       40 . The method of  claim 27 , wherein said field-responsive fiber is ferromagnetic.  
   
   
       41 . The method of  claim 40 , wherein said matrix comprises polymethyl methacrylate.  
   
   
       42 . The method of  claim 40 , wherein said nanoparticles are monodispersed within said polymeric matrix.  
   
   
       43 . The method of  claim 40 , wherein said fiber has a high saturation magnetization, ranging from 250 kA/m to 2000 kA/m.  
   
   
       44 . The method of  claim 40 , wherein said fiber has a tunable Nèel relaxation time which ranges from 2 milliseconds to 4 seconds.  
   
   
       45 . The method of  claim 44 , wherein said tunable Nèel relaxation time is a function of nanoparticle size.  
   
   
       46 . The method of  claim 40 , wherein said polymer solution is an organic solution.  
   
   
       47 . The method of  claim 27 , wherein said polymer solution comprises any polymer that can be electrospun from solution.  
   
   
       48 . A superparamagnetic fiber produced by the method of  claim 27.

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