Method for separating nano-particles at water-phase density gradient centrifugation rate

A nanoparticle and gradient centrifugation technology, which is applied in solid separation, wet separation, chemical instruments and methods, etc. The effect of wide size range, good separation effect and simple process
CN101559401AInactive Publication Date: 2009-10-21BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2009-10-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for separating nano-particles at a water-phase density gradient centrifugation rate, which mainly comprises the following steps: 1) preparing the nano-particles into a homogeneous transparent colloid nano-particle solution by means of ultrasound, stirring and the like; 2) preparing density gradient solutions with different mass percentage concentrations respectively; 3) adding certain amount of density gradient medium solutions with different concentrations into a centrifuge tube in turn to prepare a step-like or linear density gradient solution; and 4) adding the solution containing colloid nano-particles to the liquid surface of the density gradient solution slowly, and performing centrifugalization under certain condition. Because the colloid nano-particles with different sizes have different sedimentation rates in the density gradient solution and can be detained at different positions in the density gradient solution so as to achieve the effect of separation. The method has the advantages of simple method, quick separation, low cost, small influence on the stability and the purity of a sample, and the separation effect of certain section can be enhanced selectively by adjusting and controlling centrifugal parameters.
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Description

technical field

[0001] The invention relates to a method for separating nanoparticles, in particular to a method for separating nanoparticles in a liquid phase according to different particle sedimentation rates according to the size and properties of nanoparticles, and belongs to the technical field of inorganic advanced material separation technology. Background technique

[0002] Nanotechnology developed since the 1980s has led to revolutionary advances in the fields of electronics, mechanics, physics, materials, chemistry, and biology. A series of previously unimagined excellent properties have been gradually discovered and recognized in nanomaterials. For example, carbon nanotubes (Nature, 1991, 354, 56-58) and graphene (Science, 2004, 306.666-669) have super strong mechanical properties and excellent electrical conductivity, which have aroused great interest in electronics, physics, materials and other disciplines. It is widely concerned and is considered to lead to a...

Claims

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