Preparation method of porous alpha-alumina membrane

A technology of aluminum oxide film and anodized aluminum, which is applied in the field of nano-synthesis and micro-nano, can solve the problems of periodic hexagonal close-packed structure damage, membrane curling, cracking, etc., and achieve orderly arrangement, smooth membrane and wide application foreground effect
CN104404597AInactive Publication Date: 2015-03-11常毅
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
常毅
Publication Date
2015-03-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

A preparation method of a porous alpha-alumina membrane comprises the following steps: carrying out an annealing and electric polishing pretreatment on a high purity aluminum foil; taking the processed aluminum foil as the positive electrode, and graphite as the negative electrode, then carrying out two-step positive electrode oxidation in a mixed solution of phosphoric acid and aluminum oxalate to obtain an aluminum-base-containing porous anodic alumina membrane; subjecting the obtained aluminum-base-containing porous anodic aluminum membrane to a pore enlarging treatment; then subjecting the pore-enlarged aluminum-base-containing porous anodic alumina membrane to a water boiling treatment or a hydrothermal treatment; then removing the aluminum base from the aluminum-base-containing porous anodic alumina membrane, which has been treated by water boiling or a hydrothermal treatment; using a sodium citrate solution to remove the baffle layer and alumina hydrate on the external layer of the porous alumina membrane from the aluminum-base-free porous anodic alumina membrane so as to form a periodical hexahedral densely-arranged alumina through hole structure finally; and sintering the prepared alumina membrane with a periodical hexahedral densely-arranged alumina through hole structure in a muffle furnace at a high temperature so as to obtain porous alpha-alumina membrane.
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Description

technical field

[0001] The invention relates to the fields of nano-synthesis and micro-nano technology, in particular to a method for preparing an α-alumina inorganic film with a periodic hexagonal close-packed through-hole structure. Background technique

[0002] Since α-alumina is the most stable phase among all aluminas, it has the characteristics of high melting point and excellent chemical stability, so α-alumina inorganic membranes are widely used in many fields including assembly of nanomaterials, filtration and separation. In the process of preparing the α-alumina inorganic membrane, different methods can be used to prepare it according to the different factors such as membrane pore size and material. Common methods include solid particle sintering method (suspended particle method), anodic oxidation method, epitaxial molecular sieve, molecular self-assembly, laser etching and other methods.

[0003] The porous anodic aluminum oxide membrane prepared by anodic oxida...

Claims

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