Method for preparing porous nano solid by using hot pressing technique through controllable vaporized solvent

A hot-pressing technology and nano-powder technology, which is applied to the intersection of functional materials and structural materials, can solve problems such as lack of activity, and achieve the effects of improving strength and toughness, inhibiting growth, and improving mechanical strength and pore size uniformity.

Inactive Publication Date: 2003-07-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a comprehensive analysis of these results shows that: due to the lack of proper activity of these porous materials themselves, they are basically used as "templ

Method used

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  • Method for preparing porous nano solid by using hot pressing technique through controllable vaporized solvent
  • Method for preparing porous nano solid by using hot pressing technique through controllable vaporized solvent
  • Method for preparing porous nano solid by using hot pressing technique through controllable vaporized solvent

Examples

Experimental program
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Effect test

Embodiment 2

[0034] Weigh TiO 2 Nano-powder (average particle size is 30nm) 2 grams, put into mortar and add 0.5 milliliter concentration and be the ammoniacal liquor of 12 mol / liter, grind and mix 25 minutes and join in the solvent heat press mould. Then, a pressure of 50 MPa was applied to the sample, and at the same time, the temperature was raised to 200° C. at a rate of 1.0-1.5° C. / minute by a temperature program controller and kept at a constant temperature for 12 hours. TiO can be obtained after the sample is cooled to room temperature 2 Porous nano-solid, the average pore size of the solid obtained in this way is 20 nanometers. Embodiment 3: with NH 4 NO 3 Preparation of ZrO by Aqueous Solution as Pore Forming Agent 2 porous nanosolid

Embodiment 3

[0035] First weigh ZrO 2 Nanopowder (average particle size is 50nm) 3 grams, put into mortar, and add the NH that 2.0 milliliters concentration is 4 mol / liter 4 NO 3 aqueous solution. After grinding for 30 minutes, the mixed powder was added to a solvent heat press mold. A pressure of 120 MPa was applied to the sample, and at the same time, the temperature was controlled by a program temperature controller to increase to 350° C. at a rate of 2.0-2.8° C. / min and kept at a constant temperature for 8 hours. After the sample is cooled to room temperature, the mold is opened to obtain ZrO 2 porous nanosolids. Embodiment 4: with (NH 4 ) 2 Aqueous S solution as pore-forming agent while controlling Bi 2 o 3 Pore ​​arrangement of porous nanosolids

Embodiment 4

[0036] First put 3 grams of Bi 2 o 3 Nanopowder (average particle size is 12nm) is put into mortar, then adds 1.5 milliliter concentration and is 3 mol / liter (NH 4 ) 2 S aqueous solution. After grinding for 25-30 minutes, add the mixed powder into the solvent hot pressing mold. In addition, a thin layer of CaO powder (total weight 1.0 g, with a semipermeable membrane placed between the sample and CaO) was placed at both ends of the sample to absorb water and (NH 4 ) 2 S and induce directional arrangement of pores. While applying a pressure of 250 MPa on the sample, the temperature was raised to 300° C. at a rate of 2.0-2.8° C. / minute and kept constant for 6 hours. After the sample is cooled to room temperature, the mold is opened to obtain Bi with an average pore size of 100-120 nm. 2 o 3 Porous nanosolids, and most of the channels are arranged along the thickness direction of the sample. Embodiment 5: with NH 4 Cl as pore-forming agent to prepare Fe 2 o 3 porous n...

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Abstract

A process for preparing nano-class porous solid includes proportionally mixing nano powder with pore-forming agent, heating to 80-500 deg.c under 50-1000 MPa, holding the temp and pressure for 0.5-12hr to forming pores by gasifying and firm pore wall, and cooling. Its advantages are high uniformity of pore diameters and high mechanical strength.

Description

(1) Technical field [0001] The invention relates to a method for preparing a porous nano-solid by using a nano-powder through a controllable vaporization solvent hot-pressing technology, and belongs to the cross-technical field of functional materials and structural materials. (2) Background technology [0002] Porous nano-solid refers to a solid material with a certain pore structure and appropriate mechanical strength constructed by nanocrystals (particles). Its most notable feature is that the pore wall is formed by nanoparticles, so it not only has ideal strength and toughness, but also the surface of the pore wall itself is formed by the surface of nanoparticles, which has a much higher surface area than ordinary porous and microporous materials. active. These characteristics make it have unique advantages in the development of adsorption, catalysis, environmental protection, medical treatment, composite functional materials and sensitive materials. [0003] Nanomater...

Claims

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Application Information

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IPC IPC(8): B22F3/11C04B35/622C04B38/00C22C1/08
Inventor 崔得良孟宪平刘秀琳徐红燕董守义蒋民华
Owner SHANDONG UNIV
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