Glass composite including dispersed rare earth iron garnet nanoparticles
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B05D-001/24
B05D-001/22
출원번호
US-0914288
(2004-08-10)
발명자
/ 주소
Taketomi,Susamu
Sorensen,Christopher M.
Klabunde,Kennth J.
출원인 / 주소
Matsumoto Yushi Seiyaku Co., Ltd.
대리인 / 주소
Milbank, Tweed, Hadley &
인용정보
피인용 횟수 :
7인용 특허 :
7
초록▼
Glass/nanoparticle composites are provided which include a glass matrix with a high density of heterologous nanoparticles embedded therein adjacent the outer surfaces of the composite. Preferably, the glass matrix is formed of porous glass and the nanoparticles are yttrium-iron nanocrystals which ex
Glass/nanoparticle composites are provided which include a glass matrix with a high density of heterologous nanoparticles embedded therein adjacent the outer surfaces of the composite. Preferably, the glass matrix is formed of porous glass and the nanoparticles are yttrium-iron nanocrystals which exhibit the property of altering the polarization of incident electromagnetic radiation; the composites are thus suitable for use in electrooptical recording media. In practice, a glass matrix having suitable porosity is contacted with a colloidal dispersion containing amorphous yttrium-iron nanoparticles in order to embed the nanoparticles within the surface pores of the matrix. The treated glass matrix is then heated under time-temperature conditions to convert the amorphous nanoparticles into a crystalline state while also fusing the glass matrix pores. Nanoparticle loadings on the order of 109 nanoparticles/mm2 of glass surface area are possible, allowing construction of recording media having a recordable data density many times greater than conventional media.
대표청구항▼
We claim: 1. A method of forming a composite comprising of the steps of: providing a porous glass body; contacting said body with a dispersion including amorphous nanoparticles, and causing at least some of said nanoparticles to locate within pores of said body; and fusing said pores to embed said
We claim: 1. A method of forming a composite comprising of the steps of: providing a porous glass body; contacting said body with a dispersion including amorphous nanoparticles, and causing at least some of said nanoparticles to locate within pores of said body; and fusing said pores to embed said nanoparticles located in said body; wherein said fusing step comprises the step of heating said body by progressively increasing the temperature of said body to a maximum temperature of about 650째 C. to about 900째 C. for a time period of about 0.5 to about 20 hours, whereby said fusing is effected and said amorphous nanoparticles are converted into nanocrystals. 2. The method of claim 1, said contacting step comprising the step of forming a colloidal dispersion of said nanoparticles, and soaking said body in said colloidal dispersion. 3. The method of claim 1, said maximum temperature being about 800째 C. 4. The method of claim 1, including the step of progressively increasing the temperature of said body to said maximum heating temperature, keeping the temperature for a period of time ranging from 0 to 0.5 hours, followed by cooling of the body to ambient temperature. 5. The method of claim 4, said maximum temperature being from about 850째 C. to 950째 C. 6. The method of claim 5, said maximum temperature being about 900째 C. 7. The method of claim 4, including the step of heating said body at a rate of at least about 100째 C. per hour until said maximum heating temperature is reached. 8. The method of claim 7, said rate being at least about 200째 C. per hour or faster. 9. The method of claim 4, including the step of cooling said body at a rate of at least about 100째 C. per hour until ambient temperature is reached. 10. The method of claim 9, said rate being at least about 200째 C. hour or faster. 11. The method of claim 1, said nanoparticles having a diameter of up to about 300 nm. 12. The method of claim 1, there being at least about 10-109 nanocrystals per mm2 of a surface of said body. 13. The method of claim 12, said nanocrystals being present at a level of from about 107-109 nanocrystals per mm 2 of said body surface. 14. The method of claim 1, there being at least about 10 3-3횞1013 nanoparticles per mm3 of surface layer of said body. 15. The method of claim 14, said nanoparticles being present at a level of from about 3횞1010-3횞1013 nanoparticles per mm3 of said surface layer of said body. 16. The method of claim 1, at least certain of said nanoparticles within said dispersion being yttrium-iron garnet nanoparticles. 17. The method of claim 1, said nanocrystals being rare earth iron garnet nanocrystals. 18. The method of claim 17, said rare earth iron garnet nanocrystals having the formula of Fe5Y3-x-yMx NyO12 where M and N are different and are respectively taken from the group consisting of Bi, Gd, In, La, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tn, Yb and Ln, and x and y are selected to satisfy the equation of 0≦x+y≦1. 19. The method of claim 1, said porous glass body being thirsty glass. 20. The method of claim 1, said nanoparticles being formed by the alkoxide method. 21. The method of claim 1, said dispersion comprising a kerosene and surfactant mixture, said dispersion formed by agitating said nanoparticles in said mixture so as to coat said nanoparticles with said surfactant. 22. A method of forming a composite comprising of the steps of: providing a porous glass body; contacting said body with a dispersion including amorphous nanoparticles, and causing at least some of said nanoparticles to locate within pores of said body; and fusing said pores to embed said nanoparticles located in said body; wherein said nanoparticles are converted to yttrium iron garnet nanocrystals having the formula Fe5Y3O12 . 23. The method of claim 22, wherein said fusing step comprises the step of heating said body by progressively increasing the temperature of said body to a maximum temperature of about 650째 C. to about 900째 C. for a time period of about 0.5 to about 20 hours, whereby said fusing is effected and said amorphous nanoparticles are converted into nanocrystals. 24. The method of claim 22, said contacting step comprising the step of forming a colloidal dispersion of said nanoparticles, and soaking said body in said colloidal dispersion. 25. The method of claim 23, said maximum temperature being about 800째 C. 26. The method of claim 23, including the step of progressively increasing the temperature of said body to said maximum heating temperature, keeping the temperature for a period of time ranging from 0 to 0.5 hours, followed by cooling of the body to ambient temperature. 27. The method of claim 26, said maximum temperature being from about 850째 C. to 950째 C. 28. The method of claim 27, said maximum temperature being about 900째 C. 29. The method of claim 26, including the step of heating said body at a rate of at least about 100째 C. per hour until said maximum heating temperature is reached. 30. The method of claim 29, said rate being at least about 200째 C. per hour or faster. 31. The method of claim 26, including the step of cooling said body at a rate of at least about 100째 C. per hour until ambient temperature is reached. 32. The method of claim 31, said rate being at least about 200째 C. per hour or faster. 33. The method of claim 22, said nanoparticles having a diameter of up to about 300 nm. 34. The method of claim 22, there being at least about 10-109 nanocrystals per mm2 of a surface of said body. 35. The method of claim 34, said nanocrystals being present at a level of from about 107-109 nanocrystals per mm 2 of said body surface. 36. The method of claim 22, there being at least about 10 3-3횞1013 nanoparticles per mm3 of surface layer of said body. 37. The method of claim 36, said nanoparticles being present at a level of from about 3횞1010-3횞1013 nanoparticles per mm3 of said surface layer of said body. 38. The method of claim 22, said porous glass body being thirsty glass. 39. The method of claim 22, said nanoparticles being formed by the alkoxide method. 40. The method of claim 22, said dispersion comprising a kerosene and surfactant mixture, said dispersion formed by agitating said nanoparticles in said mixture so as to coat said nanoparticles with said surfactant.
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