Method for preparing spherical super-paramagnetic ferroferric oxide nano-clusters
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A ferroferric oxide and superparamagnetic technology, which is applied in nanostructure manufacturing, iron oxide/iron hydroxide, nanotechnology, etc., to achieve good reproducibility, strong magnetization, and good dispersibility
Inactive Publication Date: 2010-08-18
NANJING UNIV
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At present, the one-step preparation of superparamagnetic iron tetraoxide nanoclusters with go
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Embodiment 1
[0019] Embodiment 1. Preparation of spherical superparamagnetic ferric oxide nanoclusters
[0020] Take 5 mmol of ferric chloride hexahydrate, dissolve it in 40 ml of ethylene glycol, and stir to obtain a uniform reddish-brown solution. Take 20mmol of anhydrous sodium acetate and 1ml of PAA (number-average molecular weight: 100,000) and dissolve in the above solution in batches, sonicate and stir to obtain a uniform red viscous solution. The above solution was transferred to a hydrothermal tank with a total volume of 50ml (made of polytetrafluoroethylene), and then reacted at 220°C for 6 hours after airtight, and cooled to room temperature naturally. The sample was taken out and washed with water and alcohol for several times to obtain the product. The diameter is about 500nm, and the XRD characterization is as follows figure 1 As shown, the SEM characterization as figure 2 As shown in B, the TEM characterization is as follows image 3 As shown, the infrared characterizati...
Embodiment 2
[0021] Example 2. Preparation of Spherical Superparamagnetic Iron Tetroxide Nanoclusters
[0022] The "ethylene glycol" in Example 1 was changed to "diethylene glycol", and the other preparation conditions were the same as in Example 1 to obtain a product similar in appearance and properties to Example 1. Result is with embodiment 1.
Embodiment 3
[0023] Example 3. Preparation of Spherical Superparamagnetic Iron Tetroxide Nanoclusters
[0024] The "5mmol ferric chloride hexahydrate" in Example 1 was changed to "40mmol ferric chloride hexahydrate", and the other preparation conditions were the same as in Example 1 to obtain a product similar in appearance and properties to Example 1. Result is with embodiment 1.
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Abstract
The invention relates to a method for preparing spherical super-paramagnetic ferroferric oxide nano-clusters. The method comprises the following steps: dissolving ferric chloride hexahydrate in ethylene glycol, wherein each millimole of the ferric chloride hexahydrate is dissolved in 1 to 40 milliliters of the ethylene glycol; stirring the mixture to obtain uniform reddish brown solution; dissolving anhydrous sodium acetate in the solution obtained by the step one; ultrasonically stirring the mixture to obtain yellowish-brown viscous solution, wherein the molar ratio of the anhydrous sodium acetate to ferric chloride is 1:1-8:1; dissolving polyacrylic acid in the solution and ultrasonically stirring the mixture to obtain uniform red viscous solution, wherein 1 milliliter of PAA is added into every 40 to 400 milliliter of ethylene glycol or solution of diethylene glycol; transferring the solution to a hydrothermal kettle inner container (made from tetrafluoroethylene) with a total volume of 50 milliliters; performing a reaction at the temperature of between 180 and 220 DEG C for 6 to 16 hours after enclosing the inner container; naturally cooling the inner container to room temperature; and extracting a sample and washing the sample with water and alcohol to obtain the spherical super-paramagnetic ferroferric oxide nano-clusters. A synthetic method only needs a one-step reaction, and a used reagent is cheap and nontoxic.
Description
technical field [0001] The invention relates to a preparation method of spherical superparamagnetic iron tetraoxide nano-clusters. Background technique [0002] As a special property of magnetic nanomaterials in small size, superparamagnetism has great advantages in many fields. Superparamagnetic Fe3O4 nanomaterials have a wide range of applications in fields such as magnetic separation and detection, magnetic fluids, targeted drug loading, and hyperthermia. In view of the above reasons, superparamagnetic ferric oxide nanomaterials have been widely studied [see: (a) S.Sun, C.B.Murray, D.Weller, L.Folks and A.Moser, Science, 2000, 287, 1989-1992; (b) C.Xu, K.Xu, H.Gu, R.Zheng, H.Liu, X.Zhang, Z.Guo and B.Xu, J.Am.Chem.Soc., 2004, 126, 9938-9939; (c) M.-J. Hu, Y. Lu, S. Zhang, S.-R. Guo, B. Lin, M. Zhang and S.-H. Yu, J. Am. Chem. Soc., 2008, 130, 11606-11607; (d) M. Arruebo, R. Fernandez-Pacheco, M. R. Ibarra and J. Santamaria, Nano Today, 2007, 2, 22-32.]. At present, th...
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