Nanocrystalline metal oxide array with under-oil super-hydrophobicity and super-hydrophilicity reversible transition function and preparation method thereof

A nano-metal and nano-tube array technology, applied in nanotechnology, electrolytic inorganic material coating, electrolytic coatings, etc., can solve problems such as rare research, and achieve the effect of broadening the application scope of intelligent transformation

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still little research on the realization of the reversible transformation of

Method used

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  • Nanocrystalline metal oxide array with under-oil super-hydrophobicity and super-hydrophilicity reversible transition function and preparation method thereof
  • Nanocrystalline metal oxide array with under-oil super-hydrophobicity and super-hydrophilicity reversible transition function and preparation method thereof
  • Nanocrystalline metal oxide array with under-oil super-hydrophobicity and super-hydrophilicity reversible transition function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A specific embodiment of a nanometer metal oxide array with the reversible transformation function of superhydrophobic and superhydrophilic under oil is as follows:

[0033] 1. Preparation of nano-metal oxide arrays: the ratio of ethylene glycol, ammonium fluoride and deionized water is 98vol%: 0.3wt%: 2vol% mixed electrolyte, the metal Ti sheet is used as the anode, and the platinum sheet is used as the cathode. The anodic oxidation voltage is 30V, and the oxidation time is 3h to obtain TiO 2 arrays of nanotubes, such as figure 1 shown.

[0034] Second, the prepared TiO 2 The nanotube array was heat-treated at 120°C for 4 hours, and the static contact angle of water in the n-hexane oil phase was greater than 150°, with superhydrophobic properties, such as figure 2 shown.

[0035] In this step, in addition to n-hexane, the heat-treated TiO 2 The static contact angles of nanotube arrays in oil phases such as toluene, benzene, petroleum ether, cyclohexane, diesel oi...

Embodiment 2

[0045] A specific embodiment of a nanometer metal oxide array with the reversible transformation function of superhydrophobic and superhydrophilic under oil is as follows:

[0046] 1. Preparation of nano-metal oxide arrays: the ratio of ethylene glycol, ammonium fluoride and deionized water is 98vol%: 0.3wt%: 2vol% mixed electrolyte, the metal Ti sheet is used as the anode, and the platinum sheet is used as the cathode. Using secondary anodic oxidation, the oxidation voltage of each time is 50V, and the oxidation time is 1h to obtain TiO 2 arrays of nanotubes, such as figure 1 shown.

[0047] Second, the prepared TiO 2 The nanotube array was heat-treated at 350°C for 1 hour, and the static contact angle of water in the n-hexane oil phase was greater than 150°, with superhydrophobic properties, such as figure 2 shown.

[0048] In this step, in addition to n-hexane, the heat-treated TiO 2 The static contact angles of nanotube arrays in oil phases such as toluene, benzene, ...

Embodiment 3

[0058] A specific embodiment of a TiO2 nanotube array with sub-oil superhydrophobic and superhydrophilic reversible transformation functions is as follows:

[0059] 1. Preparation of nano-metal oxide arrays: Ammonium fluoride (0.3wt%) and ammonium sulfate mixed electrolyte was used, metal tungsten sheet was used as anode, platinum sheet was used as cathode, anodic oxidation voltage was 40V, and oxidation time was 2h. WO 3 array of nanotubes.

[0060] 2. The prepared WO 3 The nanotube arrays were heat-treated at 350°C for 1 hour, and the static contact angle of water in the n-hexane oil phase was greater than 150°, with superhydrophobic properties, such as figure 2 shown.

[0061] In this step, in addition to n-hexane, the heat-treated WO 3 The static contact angles of nanorod arrays in oil phases such as toluene, benzene, petroleum ether, cyclohexane, diesel oil, and n-heptane are all greater than 150°, realizing superhydrophobic properties in complex environments of diff...

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Abstract

The invention discloses a nanocrystalline metal oxide array with an under-oil super-hydrophobicity and super-hydrophilicity reversible transition function and a preparation method thereof. The static contact angle under the oil phase is larger than 150 degrees after the nanocrystalline metal oxide array is subjected to thermal treatment at the temperature ranging from 120 DEG C to 350 DEG C for 1 h to 4 h, and the nanocrystalline metal oxide array has super-hydrophobicity performance; the static contact angle of water under the oil phase is smaller than 10 degrees after the nanocrystalline metal oxide array is irradiated under ultraviolet light for 1 h to 2 h, the nanocrystalline metal oxide array has super-hydrophilicity performance, and the conversion from super-hydrophobicity to super-hydrophilicity is achieved; and after heating recovery is conducted for 1.5 h to 3 h at the temperature ranging from 100 DEG C to 150 DEG C, the static contact angle of water under the oil phase recovers to 150 degrees or above, the nanocrystalline metal oxide array has super-hydrophobicity performance, and the reversible conversion from super-hydrophilicity to super-hydrophobicity is achieved. According to the method, the nanocrystalline metal oxide array is prepared through an existing mature and simple method and is subjected to the processes of thermal treatment, ultraviolet irradiation and heating recovery, the function of reversible conversion from super-hydrophobicity to super-hydrophilicity under different oil phase complex environments is achieved, and therefore the application range of nanotube array intelligent conversion is widened, and important application prospects are achieved.

Description

technical field [0001] The invention relates to a nanometer metal oxide array with superhydrophobic and superhydrophilic reversible transformation functions in an oil phase environment and a preparation method thereof. Background technique [0002] In recent years, nanoarrays with such reversible surface wettability transitions by such external stimuli have attracted much attention due to their potential applications in various fields. Semiconductor oxides, due to their high band gap, can be widely used in the fields of optoelectronics, photocatalysis and wettability, and have been widely studied by scholars. In 1997, TiO was first reported 2 Nanoparticles have the function of reversible transformation from hydrophobic to superhydrophilic in air, and some scholars have successfully realized the reversible transformation from superhydrophobic to superhydrophilic in air by using ZnO nanorod arrays. However, there are few studies on the realization of the reversible transform...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D9/04C25D5/50C25D5/48B82Y40/00
CPCB82Y40/00C25D5/48C25D5/50C25D9/04C25D11/26
Inventor 成中军康红军刘宇艳吴松全
Owner HARBIN INST OF TECH
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