Preparation method capable of preparing superparamagnetic Fe3O4 nanorod with controllable size and dispersity in large scale

A large-scale preparation, dispersive technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of high graft density

Active Publication Date: 2018-01-09
郑州科斗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for one-dimensional materials (nanorods or nanowires), there is no large-scale preparation of superparamagnetic Fe with controllable size and dispersion. 3 o 4 Preparation method of nanorods

Method used

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  • Preparation method capable of preparing superparamagnetic Fe3O4 nanorod with controllable size and dispersity in large scale
  • Preparation method capable of preparing superparamagnetic Fe3O4 nanorod with controllable size and dispersity in large scale
  • Preparation method capable of preparing superparamagnetic Fe3O4 nanorod with controllable size and dispersity in large scale

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Embodiment 1

[0018] Example 1 ( figure 1 ) The present invention will be further described below in conjunction with the examples, but the content of the present invention is not limited thereto.

[0019](1) Preparation and classification of ATRP macroinitiator (cellulose-Br) based on cellulose molecules: In a 250mL single-necked flask, add 10g of natural cellulose, dissolve it in 100mL of ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl ), when completely dissolved, add 10mL anhydrous DMF and 10mL NMP respectively as diluent and acid absorbent, slowly add 50mL 2-bromoisobutyryl bromide dropwise within 1 hour under the condition of cooling to zero degree, the modified cellulose The hydroxyl group on the chain is modified to convert it into a macromolecular initiator that can be used for ATRP. Then naturally warmed to room temperature (25 o C), react at room temperature for 24 hours. Finally, 500 mL of deionized water was used as a precipitating agent to precipitate the final pr...

Embodiment 2

[0025] Example 2 ( Figure 5 ) Preparation of water-dispersible gold nanorods: (1) Preparation of brush-shaped block polymers: using cellulose-Br as a macromolecular initiator, comprehensively utilizing the experimental method of combining ATRP technology with "link" chemistry, and using terminal Modified as the monofunctional polyethylene glycol mPEG with alkyne group as the precursor of the outermost block, a series of brush-like two-block polymers with the outermost segment of PEG were prepared: cellulose- g -[PAA- b -PEG].

[0026] (a) Preparation of mPEG whose end group is alkynyl group: through nucleophilic substitution reaction, prepare mPEG whose end group is alkynyl group (ie mPEG-propargyl), and use two kinds of molecular weight mPEG (referred to as mn =5,000 and mn =10,000). The specific steps are as follows: In a 250mL three-necked flask, add 10g of dry mPEG (10.0 g, 2.0mmol) whose terminal group is a hydroxyl group, and then add 150ml of dry THF. The whole p...

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Abstract

The invention discloses a preparation method capable of preparing a superparamagnetic Fe3O4 nanorod with controllable size and dispersity in a large scale, belonging to the multidisciplinary fields like polymer active polymerization process, functional polymer molecular design and inorganic crystal growth. The method comprises the following steps: (1) with an ionic liquid AMIMCl as a solvent and anhydrous dimethylformamide and N-methylpyrrolidone as a diluent and an acid absorbent, modifying hydroxyl on the chain of cellulose by using 2-bromoisobutyryl bromide so that a macromolecular initiator capable of being used for atom transfer radical polymerization is obtained; (2) by utilizing a continuous polymerization ATRP technology and a click chemistry reaction, respectively preparing a series of brush-shaped di-block polymers, i.e., cellulose-g-[PAA-b-PS] and cellulose-g-[PAA-b-PEG]; and (3) on the basis of a solution phase synthesis method, and with a certain amount of the above-mentioned prepared brush-shaped di-block polymers as a monomolecular template and FeCl2.4H2O, FeCl3.6H2O and NH3.H2O as a precursor compound system, preparing the superparamagnetic Fe3O4 nanorod with oil dispersity and water dispersity.

Description

technical field [0001] The invention relates to a large-scale preparation of superparamagnetic Fe with controllable size and dispersion 3 o 4 The preparation method of nanorods belongs to polymer living polymerization method, functional polymer molecular design and Fe 3 o 4 Crystal growth and other interdisciplinary fields. In particular, it involves the preparation of a series of superparamagnetic Fe with controllable size, aspect ratio and dispersibility by in-situ crystal growth using bottlebrush-like functional polymers as unimolecular templates. 3 o 4 Nano stave. Background technique [0002] Submicron groups of inorganic or organic materials called nanoparticles, ranging in size from 1 to 100 nanometers, possess many new properties. Superparamagnetic nanoparticles are a new type of functional material that is widely used today. It has superior physical and chemical properties such as superparamagnetism, low Curie temperature and high coercive force, making it wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08B82Y30/00B82Y40/00
CPCY02P20/54
Inventor 庞新厂国金龙裴东杰王乐张志林周地广
Owner 郑州科斗科技有限公司
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