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Method for preparing solid film surface fatty acid self-composed monomolecular ultrathin lubrication membrane

A self-assembled single-molecule, solid surface technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of low toxicity of raw materials, low price, and dense film

Inactive Publication Date: 2002-07-17
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of fatty acid self-assembled monomolecular ultra-thin lubricating film on the surface of solid film to solve the protection and lubrication problems of materials in micro-machines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: (1) AgNO of preparation 0.1M 3 aqueous solution, 1% (mass percentage) of tannic acid aqueous solution and 1% (mass percentage) of Na 2 CO 3 aqueous solution. 20ml of AgNO 3 solution and 10ml of tannic acid solution were added to 100ml of distilled water in sequence, mixed evenly and heated to 70-80°C, then added dropwise with Na 2 CO 3The solution is constantly stirred, and the pH is adjusted to 4.5, and the obtained solution is aged at room temperature for 24 hours to obtain a brown silver-based precursor sol; (2) a single crystal silicon wafer or a glass wafer is used as a base, and it is cleaned before use; (3) The prepared silver sol is prepared on a glass slide or a single crystal silicon substrate by dipping-pulling method, the film-making temperature is 15-25°C, the relative humidity is 40-60%, and the pulling speed is controlled to be 42.4cm / (4) Dry the sol film in the air at room temperature to 50°C for 15 minutes, then heat it to 280°C with...

Embodiment 2

[0025] Embodiment 2: (1) used weak base Na when preparing silver-based precursor sol 2 CO 3 The solution was changed to NaHCO 3 Solution; adjust pH=4.5 to pH=4.0; (2) change the used fatty acid eicosanic acid into capric acid, and use solvent n-hexane to change 2-methylpentane; (3) other steps are the same as in Example 1.

Embodiment 3

[0026] Example 3: (1) Add 2g of aluminum isopropoxide into a 250ml Erlenmeyer flask, add 100ml of isopropanol and 2ml of acetylacetone in turn and stir well, then add concentrated nitric acid dropwise to adjust pH=1 to 3, After the prepared solution was stirred at room temperature for 90 minutes, the temperature was raised to 80°C, and after continuing to stir for 2 hours, it was aged in a water bath for 48 hours to obtain an orange-yellow alumina-based precursor sol; (2) adding Polyethylene glycol 400, the addition is 0.6% of the volume of the sol; (3) use a single crystal silicon wafer or glass as the substrate, and clean it before use; Prepare a sol film on a glass slide or a single crystal silicon substrate, the film forming temperature is 15-25°C, the relative humidity is 40%-60%, and the pulling speed is controlled to be 42.4cm / min to obtain the sol film; (5) the sol film Dry in air at room temperature to 70°C, then heat to 500°C and keep it warm for 10 minutes, and fina...

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PUM

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Abstract

In present ivnention the aliphatic acid which is easy to be adsorbed on the solid surface is used as raw material, with the chemical adsorption property of active group being in solution on some solids (silver and aluminium oxide) and sol-gel method to prepare solid film and self-assemble stable and ordered unimolecular aliphatic acid extra-thin film with low surface energy on it. It is characterized by that toxicity of raw material is low, film is compact and uniform, its preparation process is simple, said film possesses good abrasion-resistance, anti-friction property and antisticking property, and said ivnented aliphatic acid unimolecular film and solid film also have good combination property.

Description

Technical field: [0001] The invention relates to a method for preparing a fatty acid self-assembled monomolecular ultrathin lubricating film on the surface of a solid film. Background technique: [0002] Solid thin films (mainly metal thin films and ceramic thin films) have high hardness and good chemical stability, and can be used as protective materials in harsh environments such as corrosiveness, high and low temperature, and strong radiation; in micro-electromechanical systems (abbreviated as MEMS) Or used as anti-friction or anti-wear materials in micro machines (Micro machine) and magnetic recording systems. However, due to the miniaturization of the structural size of micromachines, the ratio of their surface area to volume has increased significantly. Compared with internal forces and gravity, electrostatic forces and friction forces have become the objects that need to be prioritized. Adhesion in such systems Questions can become an important factor in controlling ...

Claims

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Application Information

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IPC IPC(8): C09D1/00
CPCB82Y30/00
Inventor 杨生荣王金清陈淼徐洮
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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