Porous glass and preparation method thereof

Abstract

The invention relates to porous glass and a preparation method thereof, and according to the preparation method of the porous glass, the adopted acid-soluble core material glass comprises the following components in percentage by mass: 60-80wt% of a component A and 20-40wt% of a component B, wherein the component A is selected from any two of SiO2, B2O3, Al2O3, GeO2 and PbO; the component B is Li2O, Na2O or K2O; and the adopted porous glass matrix material contains a component A, and the component A contained in the porous glass matrix material is the same as the component A contained in the components of the acid-soluble core material glass. The surface roughness Sa of the inner walls of the pores of the porous glass is less than 2nm, the pore diameter deviation of any two pores is less than 1%, the pore diameter roundness is greater than 99%, the length-diameter ratio is 1-200, and the pore opening area percentage is 70-90%. The method provided by the invention can effectively reduce mutual diffusion of components at an interface and reduce the surface roughness of the pore inner wall of the porous glass, and has the characteristics of regular pore structure, good micropore mass transfer performance and the like.

Description

technical field [0001] The invention relates to the technical field of glass materials, in particular to porous glass and a preparation method thereof. Background technique [0002] Porous glass has an interconnected pore structure, generally has the advantages of high specific surface area, low relative density, light weight, sound insulation, heat insulation, good permeability, good corrosion resistance, good chemical stability, etc., suitable for use as catalysts, adsorption It can be widely used in the fields of food, environmental protection, chemical engineering, medicine and medical treatment, biology, genetic engineering and so on. The preparation process of regular porous glass is relatively complex and requires high technical conditions. However, regular porous glass has many characteristics that disordered porous glass does not have, such as secondary electron multiplication performance on the surface of the hole wall, gene sequencing microwell plate, catalytic m...

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Problems solved by technology

[0003] Porous glass with micron-scale pores cannot be prepared by mechanical processing, and the inner wall of the micropores is rough and the opening area is low; although physical and chemical etching can be used to prepare porous glass with micro-nano-scale pores, the surface of the inner wall of the micropores is not smooth. It is easy to be polluted by reaction reagents and products, and the surface roughness is high, and the uniformity of the micropores formed is poor, so it is difficult to make porous glass with a large aspect ratio; currently, glass rod tube drawing combined with acid etching and coring is generally used for preparation Regular porous glass with micro-nano pore size. The existing acid-soluble core material glass system is mainly a multi-component glass system containing silicon, boron, barium, and lanthanum, such as a borate glass system containing lanthanum or a silicate glass system containing lanthanum. , are basically six or more glass systems, but the chemical compatibility between the lanthanum-containing acid-soluble glass system and porous glass is poor, and obvious component diffusion often occurs at the interface, resulting in changes in the physical and chemical properties of the porous glass matrix material , so that the surface roughness of the inner wall of the porous glass is larger, thereby increasing the resistance of particles moving in the micropores, changing the direction of particle movement, and affecting the mass transfer performance of the micropores

Moreover, the use of rare earth oxides in lanthanum-containing acid-soluble glass systems will lead to an increase in the cost of porous glass manufacturing. These unfavorable factors limit the manufacture and application of regular porous glass to a large extent.

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