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A Method of Controllable Evaporation Surface Temperature Based on Porous Composite Materials

A porous composite material and evaporation surface technology, which is applied in the field of controllable evaporation surface temperature based on porous composite materials, can solve the problems of low energy conversion efficiency, etc. Effect

Active Publication Date: 2017-03-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy conversion efficiency of this method is low

Method used

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  • A Method of Controllable Evaporation Surface Temperature Based on Porous Composite Materials
  • A Method of Controllable Evaporation Surface Temperature Based on Porous Composite Materials
  • A Method of Controllable Evaporation Surface Temperature Based on Porous Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of gold nanoparticles

[0024] Add chloroauric acid (HAuCl 4 ) solution, chloroauric acid (HAuCl 4 ) solution has been prepared in proportion according to the formula, after the mixed solution is evenly stirred, add the prepared trisodium citrate solution, stir while heating for 20 minutes, then cool at room temperature and continue to stir for 15 minutes to obtain a particle size of 10nm gold nanoparticles. The obtained gold particle solution is used as a seed, and a certain proportion of hydroxylamine hydrochloride solution and chloroauric acid solution are repeatedly introduced to make the gold nanoparticles grow gradually. The particle size of gold nanoparticles can be grown from 10nm to about 100nm. After the growth is complete, let the gold nanoparticles settle, and the gold nanoparticles are electromagnetic wave absorbing particles, that is, light-to-heat conversion particles.

[0025] (2) Preparation of double-layer composite membrane

[002...

Embodiment 2

[0032] (1) Preparation of gold nanoparticles: same as in Example 1.

[0033] (2) Preparation of carbon film: the material with electromagnetic wave absorption characteristics is carbon; the preparation of electromagnetic wave absorption structure film is the same as example 1: in ethanol (weight concentration 0.1%-20%), will have the microscopic wave absorption characteristics Nanostructured carbon is evenly dispersed in ethanol, and a carbon film is prepared on the surface of a porous anodized aluminum filter membrane by suction filtration.

[0034] Such as Figure 4 As shown, under the same irradiation conditions, the average surface temperature of the carbon film is 102.9°C, while the average surface temperature of the gold film is 95.1°C. It can be seen that the use of different absorbing materials can also control the surface temperature.

Embodiment 3

[0036] (1) Preparation of gold nanoparticles: same as Example 1, but only 10nm particles need to be prepared.

[0037] (2) Preparation of paper-based composite membrane: use the gold nanoparticle concentrate obtained as described in (1), dilute it 3 times, take about 30mL solution, pour it into a beaker with cut dust-free paper at the bottom, put Put it in a desiccator with formic acid atmosphere. After about 12 hours, the supernatant liquid below the liquid surface was carefully removed, so that the surface self-assembled particle film was deposited on the paper fiber; then the composite film was taken out and dried.

[0038] (3) The modification of the paper-based composite membrane is the same as in Example 1, but no plasma cleaning is used.

[0039] (4) The evaporation conditions of the paper-based composite film are the same as in Example 1.

[0040] The surface temperature of the paper-based composite film during evaporation is as follows: Figure 5 shown. Its averag...

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Abstract

The invention relates to a method capable of controlling the temperature of an evaporation surface based on a porous composite material. The method comprises the following steps: (1) by taking a porous solid material as a base body, compounding electromagnetic wave absorption grains with an electromagnetic wave absorption property on the surface of the base body to prepare a porous photo-thermal conversion composite material; (2) putting the porous photo-thermal conversion composite material into an air and liquid interface; absorbing incidence electromagnetic waves by the electromagnetic wave absorption grains and converting the incidence electromagnetic waves into heat for heating a surface-layer liquid so as to raise the surface temperature of the liquid to realize evaporation; and (3) treating the surface of the porous photo-thermal conversion composite material by adopting a physical or chemical manner to adjust a geometric structure and chemical properties of the material surface, so as to control the surface temperature in a liquid evaporation process. Compared with the prior art, light energy is efficiently converted into heat by using the electromagnetic wave absorption grains and the surface-layer liquid is heated and vaporized; and the surface temperature in the evaporation process is controlled through changing surface physical and chemical properties of the base body.

Description

technical field [0001] The invention relates to a liquid evaporation method, in particular to a method based on a porous composite material with controllable evaporation surface temperature. Background technique [0002] Evaporation is the most basic phase transition process in nature. It has very critical applications in industrial production such as thermal power generation, fractionation and purification, and daily life. Such as steam power generation, the low surface temperature directly affects the use efficiency of high-temperature steam generated on the surface; fractional distillation and purification can achieve the separation of mixtures with different boiling points by controlling the surface temperature. The existing technology reads the real-time temperature through thermal sensors or thermocouples and changes the surface temperature by changing the power of the heat source. This approach has low energy conversion efficiency. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/00
Inventor 张尧段浩泽俞圣韬尚文陶鹏邬剑波宋成轶邓涛
Owner SHANGHAI JIAOTONG UNIV
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