Preparation method for gamma-alumina nanotube with prior exposure of (111) face

A technology of alumina nano and nanotubes, which is applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of uneven morphology, poor morphology, poor uniformity of product morphology, etc., and achieve high hydroxyl density and the effect of acid density

Inactive Publication Date: 2010-07-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, there are many reports on the synthesis of alumina nanotubes in recent years, most of which are synthesized by hard template methods, such as Joowon Hwang, etc., who used zinc oxide nanorods as templates to prepare alumina nanotubes by hydrolytic deposition of trimethylaluminum; Z.L.Xiao et al. used porous alumina film corrosion to prepare alumina nanotubes and nanowires, etc. The synthesis route of hard templates is complicated, and chemical methods need to be used to remove templates after synthesis, which is not conducive to large-scale synthesis of nanotube materials.
There are also a few synthesized by soft template method: such as Baochang Cheng et al. with the assistance of cetyltrimethylammonium bromide (CTAB) via Cr 3+ doped layered compound NH 4 Al(OH) 2 CO 3 Curl, and finally form Cr after high-temperature roasting treatment

Method used

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  • Preparation method for gamma-alumina nanotube with prior exposure of (111) face
  • Preparation method for gamma-alumina nanotube with prior exposure of (111) face
  • Preparation method for gamma-alumina nanotube with prior exposure of (111) face

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare 250ml of 0.25mol / L sodium oleate solution. Take 20ml of 0.25mol / L sodium oleate solution and mix it with the same volume of aluminum sol (provided by Zhejiang Yuda Chemical Co., Ltd., model AlT-10-4, the same below), mix it for a period of time, put it in a closed container, and put it in water at 180 °C Heat the reaction for 72 hours. After the reaction is over, take out the autoclave, cool to room temperature, separate the lower precipitate, centrifuge, wash, and dry to obtain AlOOH nanotubes. The TEM photos and XRD patterns are shown in figure 1 ; Adsorption-desorption curves and pore distribution curves are shown in figure 2 . AlOOH nanotubes were calcined in air at 500°C for 4 hours to obtain γ-alumina nanotubes with preferentially exposed {111} planes. The nanotubes were 100-200 nanometers long and 8-10 nanometers in outer diameter. The TEM photos and XRD patterns See image 3 , and its high-resolution TEM transmission picture is shown in Figure 4 , ...

Embodiment 2

[0032] Prepare 250 ml of 0.10 mol / L sodium campsylate solution. Take 25ml of 0.10mol / L sodium campsylate solution and mix it with 5ml sol, stir it for a period of time, put it in a closed container, and conduct a hydrothermal reaction at 150°C for 48 hours. After the reaction, take out the autoclave, cool to room temperature, separate The lower layer is precipitated, centrifuged, washed, and dried to obtain AlOOH nanotubes. The AlOOH nanotubes are calcined at 500°C for 4 hours in air to obtain γ-alumina nanotubes with preferentially exposed {111} planes. The nanotubes are 100-200 nanometers long , the outer diameter is 8-10 nanometers, the hydroxyl density reaches 1.99mmol / g, and the acid density reaches 0.489mmol / g. , its TEM photo and XRD collection of patterns are the same as Example 1 results. .

Embodiment 3

[0034] Prepare 250ml of 0.50mol / L sodium lauryl sulfate solution. Mix 10ml of 0.50mol / L sodium lauryl sulfate solution with 20ml of aluminum sol, stir for a period of time, put it in a closed container, and conduct a hydrothermal reaction at 180°C for 24 hours. After the reaction, take out the autoclave and cool it to room temperature. Separate the lower layer of sediment, centrifuge and wash, dry,

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Abstract

The invention relates to a gamma-alumina nanotube which has a single-crystal structure with the length of 100-200 nanometers and an external diameter of 8-10 nanometers. The gamma-alumina nanotube has a prior exposure of (111) crystal face, and has a hydroxyl density of 1.99mmol/g and acid density of 0.489mmol/g. The invention has the beneficial effects that the gamma-alumina nanotube with the prior exposure of (111) face is prepared by orderly assembling crystallized alumina gel by utilizing the assembling function of inexpensive surfactants, and has a single-crystal structure; the gamma-alumina nanotube with the prior exposure of (111) face has high hydroxyl density and acid density; the invention has simple process which is applicable for large-scale production and has little pollution. The invention also discloses the preparation method thereof.

Description

technical field [0001] The invention relates to a method for preparing gamma-alumina nanotubes with {111} faces preferentially exposed. Background technique [0002] Nanomaterials are new materials developed in recent years. When the size of many materials is as small as nanometers, their magnetic properties, electrical properties, optical properties, and catalytic properties are very different from the macroscopic state. In the nanoscale range, the structure, magnetism, electricity, optics and catalytic properties of many nanomaterials are largely affected by the size and shape of nanoparticles, so the preparation of nanomaterials with uniform morphology and uniform scale distribution Materials are a prerequisite for studying these properties. Among them, relatively simple and reproducible methods for producing nanomaterials with acceptable properties in large quantities are particularly attractive. [0003] γ-alumina is also called activated alumina in industry. In its ...

Claims

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Application Information

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IPC IPC(8): B82B1/00B82B3/00
Inventor 丁维平郭学锋吕建刚杨为民章浩龙
Owner NANJING UNIV
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