A single layer array of nano -grade diatom shell particles and its preparation methods

Abstract

The invention provides a nanoscale diatom shell particle based single-layer large-area array and a preparation method thereof. The preparation method comprises specific steps as follows: diatomite is burnt in the oxygen atmosphere by focusing high-energy density pulse laser beams to obtain nanoscale diatom shell particles, the nanoscale diatom shell particles are subjected to hydrophobic finishing to form closely arranged nanoscale diatom shell particle films on the surface of air-water, the nanoscale diatom shell particle films are transferred to a naturally cured PDMS (polydimethylsiloxane) by a hydrophilic modified substrate, and the nanoscale diatom shell particle based single-layer large-area array is obtained through swelling treatment of PDMS in n-hexane. The diatomite is rapidly and efficiently finished with a laser burning method, so that the particle size of the diatomite is regular, and nanocrystallization and multi-level of a porous structure are realized; by means of self-assembly as well as easy-to-transfer characteristic and swelling characteristic of PDMS, the nanoscale diatom shell particle based single-layer large-area array is realized and has the advantages of high specific surface area, high stability, high activity and the like, and the application field of diatom shells is enlarged.

Description

technical field [0001] The invention belongs to the technical field of diatomite materials, and in particular relates to a single-layer array of nanoscale diatom frustule particles and a preparation method thereof. Background technique [0002] Diatoms are single-celled algae, whose individual is very small, generally micron or millimeter in size, and the remains of diatoms after death are deposited in oceans or lakes to form diatomaceous earth. The main component of diatomite is silicon dioxide, and it also contains a small amount of aluminum, iron, calcium, magnesium, sodium, potassium and phosphorus. Diatomite has porosity, low density, large specific surface area, good adsorption, and acid resistance. Alkali-resistant insulation. Because diatomite is rich in reserves and has good physical and chemical properties, it is widely used in many fields such as environment, petroleum, and chemical industry. [0003] Diatom frustules prepared from diatomite usually have a disk-...

AI Technical Summary

Problems solved by technology

[0003] Diatom frustules prepared from diatomite usually have a disk-shaped structure in the micron scale range, and have the characteristics of multi-level and complex regular micro-nano-scale hole array structure, large specific surface area, and photonic crystals at the micron scale. They are used in biological monitoring carriers, It is involved in filters, solar cells, etc., but due to the lack of effective diatomite positioning and arrangement technology, the functionality is limited to a single or a small number of shell scales, and there are not many studies on the integration of substrates.

[0004] The Chinese literature "Research on dense monolayer arrangement of centimeter-scale disc-shaped diatom particles, Zhang Wenqiang et al., Journal of Inorganic Materials, Vol. Diatomite shells use mechanical operation combined with physical sedimentation to screen clean disc-shaped diatom shells from large quantities of diatomite, and then carry out hydrophobic finishing on disc-shaped diatom shells, and use air-water cross-section particles to self-assemble and close-packed A single-layer close-packed substrate of disc-shaped diatom frustule particles is formed, but the single-layer close-packed substrate still cannot control the location and arrangement of diatoms, and the number of disc-shaped diatoms in the prepared substrate is still greatly restricted. In addition, although suitable diatom frustules can be selected quickly and at low cost through physical sedimentation, it is greatly affected by the quality of raw materials and is likely to cause waste of resources