CN111378326B - Magnetic quantum dot, preparation method thereof and ink box - Google Patents

Magnetic quantum dot, preparation method thereof and ink box Download PDF

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Publication number
CN111378326B
CN111378326B CN201811629746.3A CN201811629746A CN111378326B CN 111378326 B CN111378326 B CN 111378326B CN 201811629746 A CN201811629746 A CN 201811629746A CN 111378326 B CN111378326 B CN 111378326B
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magnetic
quantum dot
magnetic nanoparticle
dot layer
nanoparticle core
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CN111378326A (en
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罗植天
向超宇
张滔
朱佩
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TCL Technology Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/54—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing zinc or cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/74—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing arsenic, antimony or bismuth
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements

Abstract

The invention discloses a magnetic quantum dot, a preparation method thereof and an ink box. The quantum dots are magnetically doped to make them magnetic. The magnetic quantum dots are prepared into the ink with different colors according to actual requirements, the obtained ink also has certain magnetism, the obtained ink and the common ink are mixed and injected into the ink box provided by the invention, the content of the magnetic ink in the discharged ink is controlled by controlling the intensity of an electromagnetic field arranged at a nozzle of the ink box, the components of the discharged ink are adjusted, and the printing efficiency and the utilization rate of the ink box are effectively improved.

Description

Magnetic quantum dot, preparation method thereof and ink box
Technical Field
The invention relates to the technical field of quantum dots, in particular to a magnetic quantum dot, a preparation method thereof and an ink box.
Background
The quantum dot is a special material which is limited to the nanometer order of magnitude in three dimensions, and the remarkable quantum confinement effect enables the quantum dot to have a plurality of unique nanometer properties: the emission wavelength is continuously adjustable, the light-emitting wavelength is narrow, the absorption spectrum is wide, the light-emitting intensity is high, the fluorescence lifetime is long, the biocompatibility is good, and the like. The characteristics enable the quantum dots to have wide application prospects in the fields of biomarkers, flat panel display, solid-state lighting, photovoltaic solar energy and the like.
In the display field, all functional layers of a light-emitting element can be prepared by ink-jet printing, evaporation and other methods, and the ink-jet printing method becomes one of common methods for preparing quantum dot light-emitting diodes due to the advantages of high deposition speed, good uniformity, low equipment investment, high material utilization rate and the like. In the ink-jet printing process, the quantum dots in the ink generally used do not have some special properties such as magnetism, and cannot be controlled by using an electromagnetic field, and when the ink is loaded into an ink box, the component ratio of the ink is difficult to adjust.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a magnetic quantum dot, a method for preparing the same, and an ink cartridge, which are used to solve the problems that when an inkjet printing is used to prepare a quantum dot light emitting diode in the prior art, the ink in the ink cartridge has no magnetism, and the ink components are not easily adjusted.
The technical scheme of the invention is as follows:
the magnetic quantum dot comprises a magnetic nanoparticle core, a quantum dot layer coated on the outer surface of the magnetic nanoparticle core, and an organic shell layer coated on the outer surface of the quantum dot layer.
The magnetic quantum dot, wherein the quantum dot constituting the quantum dot layer and the magnetic nanoparticle constituting the magnetic nanoparticle core are both modified with an organic ligand on the surface thereof, and the magnetic nanoparticle core and the quantum dot layer are bonded by the organic ligand.
The surface of the quantum dot layer facing the magnetic nanoparticle core is modified with an organic ligand, the surface of the quantum dot layer facing away from the magnetic nanoparticle core is further modified with a surfactant, and a hydrophobic end of the surfactant is bonded with the corresponding organic ligand.
The magnetic quantum dot, wherein the hydrophilic end of the surfactant is bonded to the organic shell layer on the outer surface of the quantum dot layer.
The magnetic quantum dot, wherein the magnetic nanoparticle core material is selected from Fe3O4、γ-Fe2O3、CoFe2O4、Ni Fe2O4And Mn Fe2O4At least one of (1).
A preparation method of magnetic quantum dots comprises the following steps:
adding quantum dots and magnetic nanoparticles into a water solution containing a surfactant, and mixing to coat the quantum dots on the outer surface of the magnetic nanoparticle cores to obtain a micellar solution with a quantum dot layer coating the magnetic nanoparticle cores;
and mixing the micellar solution of the quantum dot layer coated with the magnetic nanoparticle core with an organic shell material to coat the organic shell material on the outer surface of the quantum dot layer to obtain the magnetic quantum dot.
The preparation method of the magnetic quantum dot comprises the step of preparing an aqueous solution containing the surfactant, wherein the surfactant in the aqueous solution containing the surfactant is selected from one of tetradecyl ammonium bromide, hexadecyl trimethyl ammonium bromide and dodecyl trimethyl ammonium bromide.
The preparation method of the magnetic quantum dot comprises the following steps of adding the quantum dot and the magnetic nano-particles into a water solution containing a surfactant, mixing to coat the quantum dot on the outer surface of the magnetic nano-particle core, and obtaining a micellar solution with a quantum dot layer coating the magnetic nano-particle core, wherein the preparation method specifically comprises the following steps:
dissolving quantum dots and magnetic nanoparticles in an organic solvent to obtain a mixed solution;
adding the mixed solution into an aqueous solution containing a surfactant, and then enabling the mixed solution and the aqueous solution to generate relative motion;
and introducing inert gas to remove the organic solvent in the relative movement process so as to enable the magnetic nanoparticle cores to be agglomerated, wherein part of the surfactant on the surface of the quantum dot falls off to expose the organic ligand, and the organic ligand on the surface of the magnetic nanoparticle form a solvophobic effect, so that the micellar solution of the quantum dot layer coated on the magnetic nanoparticle cores is obtained.
The preparation method of the magnetic quantum dot comprises the following steps of mixing a micellar solution of the quantum dot layer coated with the magnetic nanoparticle core with an organic shell material, and coating the organic shell material on the outer surface of the quantum dot layer to obtain the magnetic quantum dot, and specifically comprises the following steps:
and adding the micellar solution of the quantum dot layer coating the magnetic nanoparticle core into a solution containing a shell layer material, so that the organic shell layer material is coated on the outer surface of the quantum dot layer, thereby obtaining the magnetic quantum dot.
An ink box comprises an ink box body and a nozzle, wherein an electromagnetic field generator is arranged between the ink box body and the nozzle; the ink box body contains ink, and the ink contains magnetic quantum dots and non-magnetic quantum dots; the magnetic quantum dots are prepared by the magnetic quantum dots or the preparation method of the magnetic quantum dots.
Has the advantages that: the quantum dots provided by the invention are magnetically doped to have certain magnetism, then the quantum dots with magnetism are used in ink for ink-jet printing, the ink with magnetism and the ink without magnetism are injected into the same ink box, the content of the magnetic ink in the ink is controlled by controlling the intensity of an electromagnetic field arranged at a nozzle of the ink box, the components of the ink are adjusted, and the printing efficiency and the utilization rate of the ink box are effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a specific embodiment of the magnetic quantum dot of the present invention.
Fig. 2a is a schematic structural diagram of organic ligands bonded to the surfaces of quantum dots and magnetic nanoparticles in the process of preparing magnetic quantum dots according to the present invention.
Fig. 2b is a schematic structural diagram of the quantum dots and the magnetic nanoparticles after DTAB modification in the process of preparing the magnetic quantum dots.
FIG. 2c is a schematic structural diagram of a process of forming QD-MNP-micelle by the hydrophobic solvent action of quantum dots and magnetic nanoparticles in the process of preparing magnetic quantum dots.
FIG. 3 is a schematic view of the ink cartridge of the present invention.
Detailed Description
The present invention provides a method for automatic backlight adjustment, and in order to make the objects, technical solutions, and effects of the present invention clearer and clearer, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention provides a magnetic quantum dot, as shown in fig. 1, the magnetic quantum dot includes a magnetic nanoparticle core 10 formed by magnetic agglomeration of a plurality of magnetic nanoparticles, a quantum dot layer 20 coated on an outer surface of the magnetic nanoparticle core, and an organic shell layer 30 coated on an outer surface of the quantum dot layer. Wherein, the quantum dots forming the quantum dot layer and the magnetic nanoparticles forming the magnetic nanoparticle core are both modified with organic ligands on the surface, and the magnetic nanoparticle core and the quantum dot layer are combined through the organic ligands.
In the invention, the magnetic nano-particles with organic ligands on the surfaces and the quantum dots are mixed and then added into the aqueous solution containing the surfactant, and the selected magnetic nano-particles form magnetic nano-particle cores due to magnetic agglomeration during stirring. The formed magnetic nanoparticle core and the quantum dot form a micelle under the action of a solvophobic agent. And coating an organic shell layer with a protective effect on the outer layer of the micelle to obtain the magnetic quantum dot ultra-nano particles. The existing common quantum dots are provided with magnetism, and new functions are given to the quantum dots.
Specifically, quantum dots with organic ligands on the surfaces and magnetic nanoparticles with organic ligands on the surfaces are modified by a surfactant, the modified quantum dots and the modified magnetic nanoparticles can be uniformly dispersed in an aqueous solution, and the modified quantum dots and the modified magnetic nanoparticles are partially peeled off by high-speed stirring or vibration, so that hydrophobic ligands on the surfaces of the quantum dots and hydrophobic ligands on the surfaces of the magnetic nanoparticles are exposed, and micelles are formed by the hydrophobic ligands on the surfaces of the magnetic nanoparticles and the hydrophobic parts of the quantum dots through the interaction between the ligands. And then coating the micelle with an organic material to form the magnetic nano-particles. The surface of the quantum dot layer facing the magnetic nanoparticle core in the formed magnetic nanoparticle is modified with an organic ligand, the surface of the quantum dot layer facing away from the magnetic nanoparticle core is further modified with a surfactant, and a hydrophobic end of the surfactant is combined with the corresponding organic ligand.
Preferably, the material of the magnetic nanoparticle core is selected from ferrite particles, including but not limited to superparamagnetic nano-Fe of nanometer scale3O4、γ-Fe2O3、CoFe2O4、Ni Fe2O4And Mn Fe2O 4. Further preferably, the material of the magnetic nanoparticle core is selected from superparamagnetic nano-Fe3O4（MNP）。
Preferably, the quantum dots constituting the quantum dot layer are core-shell quantum dots, and the material of the quantum dot core is a group II element and a group VI element. The group II elements include, but are not limited to, Zn, Cd, Hg, Cn, and the like; the group VI elements include, but are not limited to, O, S, Se, Te, Po, Lv, and the like. The quantum dots are CdSe-CdS core-shell quantum dots as an example.
Preferably, the organic shell material is polyvinylpyrrolidone. Because the quantum dot layer and the magnetic nano particle core are combined together by depending on the function of the solvophobic agent, in order to ensure the stable existence of the quantum dot layer, an organic shell layer is coated outside the quantum dot layer.
Preferably, the surfactant in the surfactant-containing aqueous solution is selected from one of tetradecyl ammonium bromide, hexadecyl trimethyl ammonium bromide and dodecyl trimethyl ammonium bromide. The solvophobic agent used in the present invention functions as a surfactant.
The invention also provides a preparation method of the magnetic quantum dot, which comprises the following steps:
adding quantum dots and magnetic nanoparticles into a water solution containing a surfactant, and mixing to coat the quantum dots on the outer surface of the magnetic nanoparticle cores to obtain a micellar solution with a quantum dot layer coating the magnetic nanoparticle cores;
and mixing the micellar solution of the quantum dot layer coated with the magnetic nanoparticle core with an organic shell material to coat the organic shell material on the outer surface of the quantum dot layer to obtain the magnetic quantum dot.
The magnetic quantum dot prepared by the method takes the magnetic nano-particles as the core, and the quantum dot layer is coated outside the core, so that the performance of the quantum dot is not influenced, the quantum dot is magnetic, and the quantum dot layer is protected by coating the organic layer outside the quantum dot layer, thereby enhancing the stability of the particles.
Preferably, in the preparation method of the magnetic quantum dot, organic ligands are bonded to the surfaces of the quantum dot and the magnetic nanoparticle. The ligands combined on the surfaces of the quantum dots and the magnetic nanoparticles can be the same or different, and the organic ligand is a sulfydryl-containing organic ligand. Preferably, the thiol-group-containing organic ligand is selected from one or more of mono-thiol, di-thiol, thiol alcohol, thiol amine and thiol acid. Further preferably, the monothiol is selected from one or more of hexanethiol, octanethiol, nonanethiol, decanethiol, undecanethiol, dodecanethiol, tridecanethiol, tetradecanethiol, hexadecanethiol and octadecanethiol.
Further preferably, in the preparation method of the magnetic quantum dot, the quantum dot and the magnetic nanoparticle are dissolved in an organic solvent to obtain a mixed solution; the organic solvent includes, but is not limited to, chloroform, n-octane, n-hexane, and toluene. And injecting the mixed solution dissolved with the quantum dots and the magnetic nanoparticles into an aqueous solution containing a surfactant, and carrying out relative motion on the mixed solution and the aqueous solution by adopting modes of vortex stirring, vibration and the like to thoroughly mix. In the process of relative movement, because the magnetic nanoparticles have magnetism, parts of the magnetic nanoparticles are gathered together under the action of magnetic force after the relative movement, so that magnetic nanoparticle cores are formed, meanwhile, in the process of relative movement, a hydrophobic agent combined with the quantum dots and the magnetic nanoparticle ligands can partially fall off, so that hydrophobic surface ligands are exposed, and because the solvent is water and the ligands are hydrophobic, the quantum dots can be combined with the magnetic nanoparticles under the influence of the action of the hydrophobic solvent, so that quantum dot layers are coated on the surfaces of the magnetic nanoparticle cores.
Further preferably, in the preparation method of the magnetic quantum dot, the magnetic nanoparticle core and the quantum dot form a micelle by the hydrophobic ligand on the surface of the quantum dot and the hydrophobic ligand on the surface of the magnetic nanoparticle core, and inert gas is blown into the solution at room temperature, wherein the inert gas may be nitrogen, argon, helium and the like. And blowing the organic solvent out to obtain a clear aqueous solution of the quantum dot-magnetic nanoparticle core micelle.
Preferably, the preparation method of the magnetic quantum dot is to obtain an aqueous solution of the quantum dot-magnetic nanoparticle core micelle. Mixing at room temperature, in one example, stirring at 600-800rpm during the mixing process, rapidly injecting into the solvent containing the organic material, and centrifuging after stirring to obtain the particles with the organic shell layer coating the quantum dot layer and the magnetic nanoparticle core. The organic material includes, but is not limited to, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene glycol, and the like.
The invention also provides an ink box, as shown in fig. 3, comprising an ink box body and a nozzle 100, wherein an electromagnetic field generator 300 is arranged between the ink box body and the nozzle; the ink box body contains ink 200, and the ink contains magnetic quantum dots and non-magnetic quantum dots; the magnetic quantum dots are the magnetic quantum dots or the magnetic quantum dots obtained by the preparation method. Wherein the electromagnetic field generator is aimed at providing a magnetic field, as long as its strength is controllable.
The invention is further illustrated by the following specific examples.
The cartridges described in the following examples contain two inks, where the magnetically doped ink is denoted by M and the ordinary ink by N.
Example 1
1ml of chloroform solution containing 4mg of red CdSe-CdS core-shell quantum dots and 6mg of nano superparamagnetic nano ferroferric oxide (MNP) (quantum dots and magnetic nanoparticles are combined with organic ligands, as shown in FIG. 2a, 1 represents CdSe-CdS core-shell quantum dots, 2 represents magnetic nanoparticles, and 3 represents organic ligands) is injected into 1ml of Dodecyl Trimethyl Ammonium Bromide (DTAB) aqueous solution (20 mg/ml in ultrapure water), (QDs and MNPs are modified, as shown in FIG. 2b, and 4 represents DTAB). The solution was thoroughly mixed by vortex stirring for 5 seconds. Chloroform is removed from the mixture by blowing Ar at room temperature, and the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide are combined together under the action of a hydrophobic solvent (dodecyl trimethyl ammonium bromide) to obtain a clear micellar water solution of the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide (the process that the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide form micelles is shown in figure 2c, and the DTAB in the middle of c indicates the fallen DATB).
The micelle solution is rapidly injected into 5ml of Ethylene Glycol (EG) solution of polyvinylpyrrolidone (PVP) at the stirring speed of 700rpm at room temperature, stirred for 30 minutes, and the obtained magnetic doped red quantum dot ultra-nano particles with the core-shell structure are separated through centrifugation.
The magnetic doping red quantum dots M and the common non-magnetic blue quantum dots N are simultaneously injected into the ink box provided by the invention, so that the blue and red quantum dots can be printed in the same ink box under the control of a magnetic field.
Example 2
1ml of chloroform solution containing 4mg of red CdSe-CdS core-shell quantum dots and 6mg of nano superparamagnetic nano ferroferric oxide (MNP) was injected into 1ml of Dodecyl Trimethyl Ammonium Bromide (DTAB) aqueous solution (20 mg/ml in ultrapure water). The solution was thoroughly mixed by vortex stirring for 5 seconds. Chloroform is removed from the mixture by blowing Ar at room temperature, and the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide are combined together under the action of a hydrophobic solvent (dodecyl trimethyl ammonium bromide) to obtain a clear micellar aqueous solution of the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide.
The micelle solution is rapidly injected into 5ml of Ethylene Glycol (EG) solution of polyvinylpyrrolidone (PVP) at the stirring speed of 800rpm at room temperature, stirred for 30 minutes, and the obtained magnetic doped red quantum dot ultra-nano particles with the core-shell structure are separated through centrifugation.
The magnetic doping red quantum dots M and the common green quantum dots N without magnetism are simultaneously injected into the ink box provided by the invention, so that the green and red quantum dots can be printed in the same ink box under the control of a magnetic field.
Example 3
1ml of chloroform solution containing 4mg of green CdSe-CdS core-shell quantum dots and 6mg of nano superparamagnetic nano ferroferric oxide (MNP) was injected into 1ml of Dodecyl Trimethyl Ammonium Bromide (DTAB) aqueous solution (20 mg/ml in ultrapure water). The solution was thoroughly mixed by vortex stirring for 5 seconds. Chloroform is removed from the mixture by blowing Ar at room temperature, and the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide are combined together under the action of a hydrophobic solvent (dodecyl trimethyl ammonium bromide) to obtain a clear micellar aqueous solution of the red CdSe-CdS core-shell quantum dots and the nano-sized superparamagnetic nano-sized ferroferric oxide.
The micelle solution is rapidly injected into 5ml of Ethylene Glycol (EG) solution of polyvinylpyrrolidone (PVP) at the stirring speed of 600rpm and stirred for 30 minutes at room temperature, and the obtained magnetic doped red quantum dot ultra-nano particles with the core-shell structure are separated through centrifugation.
The green quantum dots M with magnetic doping and the common blue quantum dots N without magnetic doping are injected into the ink box provided by the invention at the same time, so that the blue and green quantum dots can be printed in the same ink box under the control of a magnetic field.
In conclusion, the quantum dots provided by the invention have magnetism, the quantum dots are prepared into inks with different colors according to actual needs, the obtained inks also have certain magnetism, the obtained inks are mixed with common inks and injected into the ink box provided by the invention, the content of the magnetic inks in the discharged inks is controlled by controlling the intensity of an electromagnetic field arranged at a nozzle of the ink box, the components of the discharged inks are adjusted, and the printing efficiency and the utilization rate of the ink box are effectively improved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (6)

1. The magnetic quantum dot is characterized by comprising a magnetic nanoparticle core, a quantum dot layer coated on the outer surface of the magnetic nanoparticle core and an organic shell layer coated on the outer surface of the quantum dot layer;
the surface of the quantum dot layer, which is far away from the magnetic nanoparticle core, is modified with an organic ligand, the surface of the quantum dot layer, which is far away from the magnetic nanoparticle core, is also modified with a surfactant, and the hydrophobic end of the surfactant is combined with the corresponding organic ligand;
the hydrophilic end of the surfactant is combined with the organic shell layer on the outer surface of the quantum dot layer;
the surface of the magnetic nanoparticle core is modified with an organic ligand, and the magnetic nanoparticle core is combined with the quantum dot layer through the organic ligand.
2. The magnetic quantum dot of claim 1, wherein the magnetic nanoparticle core material is selected from Fe3O4、γ-Fe2O3、CoFe2O4、Ni Fe2O4And Mn Fe2O4At least one of (1).
3. A preparation method of magnetic quantum dots is characterized by comprising the following steps:
adding quantum dots and magnetic nanoparticles into a water solution containing a surfactant, and mixing to coat the quantum dots on the outer surface of the magnetic nanoparticle cores to obtain a micellar solution with a quantum dot layer coating the magnetic nanoparticle cores;
mixing the micellar solution of the quantum dot layer coated with the magnetic nanoparticle core with an organic shell material to coat the organic shell material on the outer surface of the quantum dot layer to obtain the magnetic quantum dot;
the surface of the quantum dot layer, which is far away from the magnetic nanoparticle core, is modified with an organic ligand, the surface of the quantum dot layer, which is far away from the magnetic nanoparticle core, is also modified with a surfactant, and the hydrophobic end of the surfactant is combined with the corresponding organic ligand;
the surface of the magnetic nanoparticle core is modified with an organic ligand, and the magnetic nanoparticle core is combined with the quantum dot layer through the organic ligand;
adding quantum dots and magnetic nanoparticles into a water solution containing a surfactant, mixing to coat the quantum dots on the outer surface of a magnetic nanoparticle core, and obtaining a micellar solution with a quantum dot layer coating the magnetic nanoparticle core, wherein the method specifically comprises the following steps:
dissolving quantum dots and magnetic nanoparticles in an organic solvent to obtain a mixed solution;
adding the mixed solution into an aqueous solution containing a surfactant, and then enabling the mixed solution and the aqueous solution to generate relative motion;
and introducing inert gas to remove the organic solvent in the relative movement process to obtain the micelle solution of the quantum dot layer coating the magnetic nanoparticle cores.
4. The method for preparing the magnetic quantum dot according to claim 3, wherein the surfactant in the surfactant-containing aqueous solution is selected from one of tetradecyl ammonium bromide, hexadecyl trimethyl ammonium bromide and dodecyl trimethyl ammonium bromide.
5. The method for preparing a magnetic quantum dot according to claim 3, wherein the step of mixing the micellar solution of the quantum dot layer coating the magnetic nanoparticle core with an organic shell material to coat the organic shell material on the outer surface of the quantum dot layer to obtain the magnetic quantum dot specifically comprises:
and adding the micellar solution of the quantum dot layer coating the magnetic nanoparticle core into a solution containing a shell layer material, so that the organic shell layer material is coated on the outer surface of the quantum dot layer, thereby obtaining the magnetic quantum dot.
6. An ink box comprises an ink box body and a nozzle, and is characterized in that an electromagnetic field generator is arranged between the ink box body and the nozzle; the ink box body contains ink, and the ink contains magnetic quantum dots and non-magnetic quantum dots; the magnetic quantum dot is prepared by the preparation method of the magnetic quantum dot in claims 1-2 or the magnetic quantum dot in any one of claims 3-5.
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KR101781976B1 (en) * 2015-04-08 2017-10-23 한국과학기술연구원 Nano-structured hybrid particle, manufacturing method thereof, and device containing the particle
CN108437634B (en) * 2018-01-16 2019-06-11 北京梦之墨科技有限公司 A kind of electromagnetism printing head, electromagnetism printing equipment and Method of printing

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