Carbon coated magnetic nanoparticles and their use in separation processes
AssigneeETH Zurich
InventorsRobert N. Grass, Wendelin Jan Stark
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Abstract
The invention relates to a process for separating a dispersed phase from a continuous phase comprising the steps of i) contacting said phases with an effective amount of nanoparticles; ii) applying a magnetic field gradient to the obtained system; iii) separating the obtained phases wherein said nanoparticles are of the core shell type, said core consists of a metal or alloy having soft magnetic properties and said shell contains a graphene layers which are optionally functionalized; to new nanoparticles and method of manufacturing such nanoparticles.
Claims23
A method for separating a dispersed phase or a dissolved material from a continuous phase comprising the steps of
- i) contacting said phases with an effective amount of nanoparticles;
- ii) applying a magnetic field gradient to the obtained system;
- iii) separating the obtained phases
- wherein said nanoparticles are of the core shell type, said core consists of a metal or alloy having soft magnetic properties and said shell contains one or more graphene-layers
- said nanoparticles having saturation magnetization of at least 120 A m2/kg,
- said graphene layer having a thickness between 0.3-5 nm,
- said graphene layer being functionalized by one or more of the groups according to formula (I):
- wherein
- n is an integer between 1 and 5;
- m is an integer between 0 and 20;
- Z represents a spacer selected from the group of alkyl, alkenyl, alkyloxy, peptides, amino acids saccharides;
- FG represents independent from each other OH, OR, NO2, NH2, NHR, NR2, COH, COR, COOH, COOR, SO2, SOR, SO2R, halogen, P(O)OH, P(O)OR, P(O)2OH, P(O)2OR
- R represents C1-C4alkyl, C1-C4alkoxy, C3-C10cyclo-alkyl, C4-C10 aryl,
- or a 5-membered heterocycle containing at least one atom selected from the group of N, O, S
- or a 6-membered heterocycle containing at least one atom selected from the group of N, O, S
- or a metal chelating group selected from the group consisting of polycarboxylic acids, polyamides, polyamides, amino acids, polyaminocarboxylates, polyamines, polysulfides;
- and its salts.
A method for separating a dissolved material from a continuous phase comprising the use of nanoparticles of the core shell type, wherein said core consists of a metal or alloy having soft magnetic properties and said shell consists essentially of one or more graphene layers
- said nanoparticles having saturation magnetization of at least 120 A m2/kg,
- said graphene layer having a thickness between 0.3-5 nm,
- said graphene layer being functionalized by one or more of the groups according to formula (I):
- wherein
- n is an integer between 1 and 5;
- m is an integer between 0 and 20;
- Z represents a spacer selected from the group of alkyl, alkenyl, alkyloxy, peptides, amino acids saccharides;
- FG represents independent from each other OH, OR, NO2, NH2, NHR, NR2, COH, COR, COOH, COOR, SO2, SOR, SO2R, halogen, P(O)OH, P(O)OR, P(O)2OH, P(O)2OR
- R represents C1-C4alkyl, C1-C4alkoxy, C3-C10cyclo-alkyl, C4-C10 aryl,
- or a 5-membered heterocycle containing at least one atom selected from the group of N, O, S
- or a 6-membered heterocycle containing at least one atom selected from the group of N, O, S
- or a metal chelating group selected from the group consisting of polycarboxylic acids, polyamides, polyamides, amino acids, polyaminocarboxylates, polyamines, polysulfides;
- and its salts.
Nanoparticle of the core shell type, wherein said core consists of a metal or alloy having soft magnetic properties and said shell contains one or more graphene layers,
- said nanoparticles having saturation magnetization of at least 120 A m2/kg,
- said graphene layer having a thickness between 0.3-5 nm,
- said graphene layer being functionalized by one or more of the groups according to formula (I):
- wherein
- n is an integer between 1 and 5;
- m is an integer between 0 and 20;
- Z represents a spacer selected from the group of alkyl, alkenyl, alkyloxy, peptides, amino acids saccharides;
- FG represents independent from each other OH, OR, NO2, NH2, NHR, NR2, COH, COR, COOH, COOR, SO2, SOR, SO2R, halogen, P(O)OH, P(O)OR, P(O)2OH, P(O)2OR
- R represents C1-C4alkyl, C1-C4alkoxy, C3-C10cyclo-alkyl, C4-C10 aryl,
- or a 5-membered heterocycle containing at least one atom selected from the group of N, O, S
- or a 6-membered heterocycle containing at least one atom selected from the group of N, O, S
- or a metal chelating group selected from the group consisting of polycarboxylic acids, polyamides, polyamides, amino acids, polyaminocarboxylates, polyamines, polysulfides;
- and its salts.
A method for manufacturing a nanoparticle according to claim 12 comprising the step of reacting a nanoparticle of the core shell type, with a diazo-compound of formula (II)
- wherein
- X represents a suitable anion,
- m, n, Z, FG are as defined in claim 17,
- optionally in the presence of a diluent and
- optionally in the presence of a reaction aid
- wherein said core of the core shell type nanoparticle consists of a metal or alloy having soft magnetic properties and said shell of the core shell type nanoparticle contains graphene layers.
Dependencies are inferred from the claim text.