US2008271570A1PendingUtilityA1
Method to prepare nanoparticles suspension in ionic liquids
Individually held — no corporate assignee on recordPriority: May 1, 2007Filed: May 1, 2007Published: Nov 6, 2008
Est. expiryMay 1, 2027(~0.8 yrs left)· nominal 20-yr term from priority
B22F 1/0545B22F 2999/00C01B 17/20B22F 2009/165C01B 21/06C01B 21/0821C01P 2004/64C01B 32/90C01B 13/32B82Y 30/00B22F 9/12
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Claims
Abstract
A method to preparing suspensions of metal or metal alloy nanoparticles in an ionic liquid involves the physical vapor deposition of a metal or a mixture of metals onto an ionic liquid. The method can be modified by the introduction of a reagent during or after formation of the suspension to yield nanoparticles of a metal salt. The nanoparticles can be isolated from the suspension by the thermal decomposition of the ionic liquid under conditions where the decomposition products are gaseous.
Claims
exact text as granted — not AI-modified1 . A method for preparing a suspension of nanoparticles comprising the steps of:
providing one or more ionic liquids; and depositing as a vapor at least one metal into said ionic liquid wherein metal containing nanoparticles become suspended in said ionic liquid.
2 . The method of claim 1 , wherein said metal containing nanoparticles comprise a single metal.
3 . The method of claim 1 , wherein said metal containing nanoparticles comprise an alloy.
4 . The method of claim 1 , wherein said metal containing nanoparticles comprise a mixture of different metal nanoparticles.
5 . The method of claim 1 , wherein said depositing step is carried out in an atmosphere of a reactive gas wherein the resulting nanoparticles comprise metal oxides, metal sulfides, metal nitride, metal oxysulfides, or metal oxynitrides.
6 . The method of claim 5 , wherein said reactive gas is selected individually or in combination from the group consisting of oxygen, nitrogen, ammonia, and hydrogen sulfide.
7 . The method of claim 1 , wherein said metal comprises platinum, silver, gold, cobalt, nickel, iron, manganese, rhodium, palladium, rhenium, ruthenium, iridium or osmium.
8 . The method of claim 1 , wherein said ionic liquid comprises cations selected from the group consisting of:
1-alkyl-3-methylimidizolium
where R═C 1 to C 8 , alkyl,
N-alkyl pyridinium
where R═C 1 to C 8 , alkyl,
mono-, di-, tri- or tetraalkyl ammonium
where R=independently H, C 1 to C 8 alkyl, where at least one R≠H, and
mono-, di-, tri- or tetraalkylphosphonium
where R=independently H, C 1 to C 8 alkyl and at least one R≠H, and anions selected from the group consisting of Cl − , Br − , I − , NO 3 − , BF 4 − , PF 6 − , CF 3 CO 2 − , CF 3 SO 3 − , (CF 3 SO 2 ) 2 N − , CH 3 (CH 2 ) x CO 2 − where x=0to 18, and BR 4 − where R=independently C 1 C 8 alkyl.
9 . The method of claim 1 , wherein the step of depositing comprises sputtering.
10 . The method of claim 1 , further comprising the step of introducing a source of oxygen, sulfur or nitrogen at a sufficiently high temperature to the suspension of said nanoparticles comprising a metal, wherein said suspension is converted into a suspension of nanoparticles comprising metal oxides, metal sulfides, or metal nitrides.
11 . A method for preparing nanoparticles comprising the steps of:
providing an ionic liquid; depositing as a vapor at least one metal onto said ionic liquid wherein metal containing nanoparticles are suspended in said ionic liquid; and heating said suspension to decompose said ionic liquid into gaseous neutral molecules wherein said remaining nanoparticles are essentially free of said ionic liquid, decomposition products of said ionic liquid, and other impurities.
12 . The method of claim 11 , wherein said metal containing nanoparticles comprise a metal.
13 . The method of claim 11 , wherein said metal containing nanoparticles comprise an alloy.
14 . The method of claim 11 , wherein said metal containing nanoparticles comprise a mixture of different metal nanoparticles.
15 . The method of claim 11 , wherein said step of depositing is carried out in an atmosphere of a reactive gas wherein the resulting nanoparticles comprise metal oxides, metal sulfides, metal nitride, metal oxysulfides, or metal oxynitrides.
16 . The method of claim 15 , wherein said reactive gas is selected individually or in combination from the group consisting of oxygen, nitrogen, ammonia, and hydrogen sulfide.
17 . The method of claim 11 , wherein said metal comprises platinum, silver, gold, cobalt, nickel, iron, manganese, rhodium, palladium, rhenium, ruthenium, iridium or osmium.
18 . The method of claim 11 , wherein said ionic liquid comprise cations selected from the group consisting of
1-alkyl-3-methylimidizolium
where R═C 1 to C 8 , alkyl,
N-alkyl pyridinium
where R═C 1 to C 8 , alkyl,
mono-, di-, tri- or tetraalkyl ammonium
where R=independently H,C 1 to C 8 alkyl, where at least one R≠H, and
mono-, di-, tri- or tetraalkylphosphonium
where R=independently H,C 1 to C 8 alkyl and at least one R≠H, and anions selected from the group consisting of Cl − , Br − , I − , NO 3 − , BF 4 − , PF 6 − , CF 3 CO 2 − , CF 3 SO 3 − , (CF 3 SO 2 ) 2 N − , CH 3 (CH 2 ) x CO 2 − where x=0to 18, and BR 4 − where R=independently C 1 to C 8 alkyl.
19 . The method of claim 11 , wherein the step of depositing comprises evaporation, pulsed laser deposition or sputtering.Join the waitlist — get patent alerts
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