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Method for preparing photo-thermal steam by absorbing sunlight through localized surface plasmon resonance (LSPR) of nano material

A plasmonic resonance, localized surface technology, which is applied in the steam generation method using solar energy, the components of solar collectors, solar thermal devices, etc. Problems such as low thermal vapor velocity, to achieve the effect of high photothermal conversion efficiency, simple process, and high LSPR intensity

Active Publication Date: 2017-05-03
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing photothermal steam by using nanomaterial localized surface plasmon resonance to absorb sunlight, which has good shape control, easy preparation, large output, low cost, high LSPR intensity, LSPR spectrum and solar energy. Optically matched nano-silver particles are used as the transformation matrix of localized surface plasmon resonance absorption, and the photothermal vapor is prepared by direct focusing of sunlight irradiation. This method has high photothermal conversion efficiency, high vapor rate, simple process, and flexible modular assembly production scale. Controllable, low cost, unattended operation, and easy popularization and application, it fills the gap in this research field that only stays in the laboratory optical simulator research without using real sunlight research, provides a new way for efficient use of clean solar energy, and solves the problem of The shape of nanomaterials is difficult to control, the yield is low, the repeatability of the experiment is poor, the preparation process is complicated and cumbersome, the cost is high, the speed of photothermal vapor generated by direct sunlight in the real natural environment is low, and the vapor is difficult to collect and utilize.

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  • Method for preparing photo-thermal steam by absorbing sunlight through localized surface plasmon resonance (LSPR) of nano material
  • Method for preparing photo-thermal steam by absorbing sunlight through localized surface plasmon resonance (LSPR) of nano material
  • Method for preparing photo-thermal steam by absorbing sunlight through localized surface plasmon resonance (LSPR) of nano material

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Experimental program
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Effect test

Embodiment 1

[0039](1) Preparation of 80nm nano-silver particles: Weigh 1.0g silver nitrate, 3.0g polyvinylpyrrolidone (weight average molecular weight is 30000 or 58000) and 0.3g nickel nitrate, add 200mL anhydrous ethylene glycol, seal and stir until completely dissolved, Then open the container and heat it with microwave irradiation with a frequency of 2450MHz for 4-5min. The reaction temperature is above 140°C. After the reaction is completed, cool to room temperature. Washed 2-3 times, the nanoparticles after washing were dispersed in 100mL deionized water for subsequent use, and the suspension of nano-silver particles was obtained, and its scanning electron microscope (SEM) figure is shown in figure 2 10-20min ultrasonication of the obtained nano-silver particle suspension, take 10mL, add 20±1mL deionized water, stir vigorously for 20-30min and ultrasonically 5-10min to obtain a dispersion of nano-silver particles,

[0040] (2) the dispersion liquid of the nano-silver particle that ...

Embodiment 2

[0045] With reference to Example 1, the difference is that in step (1), 10 mL of nano-silver particle suspension is taken, and 27 ± 1 mL of deionized water is added, and in step (2), focused sunlight is irradiated for 5.5 min, and the irradiated sunlight is averaged The light energy density is 720W / m 2 . During the cycle, the solution rises from the initial temperature of 28°C to 64°C, 5.0g of steam is generated, the temperature of the steam is higher than 110°C, and the photothermal conversion efficiency is 64.55% (see image 3 2# in middle a), the photothermal vapor rate is 10.8g / (AM1.5·min·m 2 )(See image 3 2# in middle b).

Embodiment 3

[0047] With reference to Example 1, the difference is that in the step (1), 7 mL of the nano-silver particle suspension is taken, and 29 ± 1 mL of deionized water is added, and in the step (2), the focused sunlight is irradiated for 3 min, and the irradiated sunlight average light The energy density is 817W / m 2 . During the cycle, the solution rises from the initial temperature of 33°C to 58°C, 3.0g of steam is generated, the temperature of the steam is higher than 110°C, and the photothermal conversion efficiency is 65.46% (see image 3 3# in a), the photothermal vapor rate is 10.8g / (AM1.5·min·m 2 )(See image 3 3# in middle b).

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Abstract

The invention discloses a method for preparing photo-thermal steam by absorbing sunlight through localized surface plasmon resonance (LSPR) of a nano material. A nano silver particulate matter which is high in morphological control capacity, easy to prepare, high in yield, low in cost and high in LSPR intensity and has an LSPR spectrum matched with the sunlight is used as a conversion substrate for LSPR absorption, and can directly focus the radiation of the sunlight to prepare the photo-thermal steam. The method is high in photo-thermal conversion efficiency, high in steam rate, simple in process, flexible and controllable in modularized assembling and production scale and low in cost, realizes unattended operation, is easy to popularize and apply, fills the blank that the research is only done with an optical simulator in a laboratory in the research field, but no real sunlight is used for the research, and supplies a new way for efficient use of the clean solar energy.

Description

[0001] Technical field: [0002] The invention relates to the field of photothermal technology, in particular to a method for preparing photothermal vapor by using nanomaterial localized surface plasmon resonance to absorb sunlight. [0003] Background technique: [0004] Nanomaterials with localized surface plasmon resonance (LSPR) characteristics have plasmons on their surface. When the frequency of incident light matches its plasmon vibration frequency, the nanomaterials and incident light undergo strong resonant absorption and scattering. The photon energy absorbed by resonance is quickly converted into thermal energy, and the surrounding medium is quickly vaporized. The LSPR absorption spectrum of nanomaterials depends on its microstructural properties such as its composition, structure, shape, size, surface ligands, colloidal spacing, surrounding solvents, and local conductivity. It can be adjusted by adjusting the microstructure of nanomaterials to absorb LSPR The spect...

Claims

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Application Information

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IPC IPC(8): F24J2/48F24J2/06F24J2/38F24J2/40F22B1/00F24S23/00F24S50/20
CPCF22B1/006F24S23/00F24S50/00F24S50/20F24S70/10Y02E10/44Y02E10/47
Inventor 苗蕾王海龙周建华邓梓阳刘朋飞
Owner GUILIN UNIV OF ELECTRONIC TECH
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