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Application of super hydrophilicity and/or super lipophilicity nano pore material

A nanoporous material and super-hydrophilic technology, which is applied in the field of superhydrophilic and/or super-lipophilic nanoporous materials to achieve the effects of improved affinity properties, fast spreading speed, and excellent filtration effect

Inactive Publication Date: 2005-11-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the wettability of the material surface is determined by the properties of the material itself and the microstructure of the material surface. Recent research results have shown that the solid surface of the porous structure has persistent amphiphilicity (V.M.Starov, S.R.Kosvintsev, V.D.Sobolev, M.G. Velarde, S.A.Zhdanov, "Spreading of liquid drops over dry porous layers: Complete wetting case", J.Colloid Interface Sci.2002, 252, 397), but the contact angle is still greater than 5°

Method used

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  • Application of super hydrophilicity and/or super lipophilicity nano pore material
  • Application of super hydrophilicity and/or super lipophilicity nano pore material
  • Application of super hydrophilicity and/or super lipophilicity nano pore material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1: Use of superhydrophilic and / or superlipophilic nanoporous silica in anti-fog aspects. 208 parts by weight of tetraethyl orthosilicate, 260 parts by weight of ethanol, 36 parts by weight of water, and 0.63 parts by weight of nitric acid , block copolymer Pluronic-127{PEO 20 -PPO 106 -PEO 20}84 parts by weight were mixed evenly, and refluxed at 60° C. for 90 minutes under electromagnetic stirring to obtain a colorless and transparent silica sol. Apply the obtained sol to glass, pottery, stone or metal at a lifting speed of 30 cm / min to form a thin film by dipping into the pulling coating method. After drying at room temperature, the obtained film material was immersed in ethanol for 2 hours to dissolve the block copolymer to obtain a nanoporous material with a superhydrophilic and / or superlipophilic surface. The results of transmission electron microscopy show that the nanopores are arranged in a hexagonal manner, and the size of the pores is about 10 nanome...

Embodiment 2

[0041] Example 2: Use of superhydrophilic and / or superoleophilic nanoporous silica composites in self-cleaning

[0042] In the silica sol obtained in Example 1, add 10 parts by weight of titanium dioxide nanoparticles P25 or zinc oxide nanoparticles (average particle diameter 20 nanometers), and obtain a composite sol after ultrasonic dispersion is uniform. The sol is coated on a glass sheet to obtain a nanoporous silica composite material with self-cleaning function. The static contact angles of water and hexadecane on its surface are 4.8° and 0°, respectively, indicating superamphiphilic properties. The coating has the properties of decomposing organic matter, anti-fouling, anti-fog, sterilization and deodorization due to photocatalysis under light irradiation, and has self-cleaning properties. It can be used to manufacture medical materials, wall tiles, glass, etc. with sterilization and disinfection functions, and has the effect of purifying air.

Embodiment 3

[0043] Example 3: Use of superhydrophilic and / or superoleophilic nanoporous titanium dioxide in self-cleaning

[0044] 250 parts by weight of tetrabutyl titanate, 450 parts by weight of ethanol, 18 parts by weight of nitric acid, and 75 parts by weight of glucose were uniformly mixed, and refluxed at 60° C. for 2 hours under electromagnetic stirring to obtain a colorless and transparent titanium dioxide sol. The resulting sol was coated on a flat glass slide at a speed of 2500 rpm by spin coating to form a thin film. After drying at room temperature, place the obtained film material in a sintering furnace, and ventilate the air, heat up to 500°C at a rate of 2°C / min and burn for 2 hours to remove glucose and obtain self-cleaning superhydrophilic, super Lipophilic nanoporous titanium dioxide. Transmission electron microscope results show that the nanopores are arranged in a hexagonal manner, and the size of the pores is about 2 nanometers. The static contact angles of water a...

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Abstract

An ultrahydrophilic and / or ultralipophilic material with nano-pores used in self-cleaning, bactericiding, antifog, adsorptive, catalytic and wave-absorptive fields is prepared from the material with nano-pores and the functional nano-particles through compounding.

Description

technical field [0001] The invention belongs to the field of nanoporous materials, in particular to the application of superhydrophilic and / or superlipophilic nanoporous materials. Background technique [0002] Nanoporous materials refer to amphiphilic molecules or nanoparticles as templates, using physical and chemical processes such as sol / gel, emulsification or microemulsion, through the interfacial assembly and synergistic chemical reactions between organic and inorganic substances. Between 1 and 100 nanometers, a porous material with a pore channel structure. Nanoporous materials are easily chemically modified and heterogeneously compounded to obtain functional materials. In 1992, researchers from Mobil Corporation successfully synthesized the MCM-41 nanoporous molecular sieve, whose pore size can be adjusted between 1.5 and 10 nanometers. Its single pore size distribution, high specific surface area and porosity have attracted widespread attent...

Claims

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Application Information

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IPC IPC(8): C09D5/00
Inventor 杨振忠杨正龙马劲江雷
Owner INST OF CHEM CHINESE ACAD OF SCI
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