Photo Thermal Properties Of Ester Based Azobenzene Doped Ag And Ag@SiO₂ Nanoparticles

With the application of phase change materials becoming more and more widespread,the research on the materials is also becoming more and more in-depth.In recent years,the study of composite phase change material doped particles has received a lot of attention,but it is mainly focused on the thermal storage capacity of the material,and the research on the optical properties of composite phase change material doped particles is still lacking.This paper conducts an in-depth study on the optical properties,including the preparation and testing of Ag and Ag@SiO2 nanoparticles,the synthesis and characterization of ester-based azobenzene composite phase change materials,the In this paper,the optical properties of Ag and Ag@SiO2 nanoparticles are studied,including the preparation and testing of Ag and Ag@SiO2 nanoparticles,the synthesis and characterization of ester-based azobenzene composite phase change materials,the doping of nanoparticles with composite phase change materials,and the optical properties of nanoparticles with composite phase change materials.1.Ag and Ag@SiO2 nanoparticles were prepared by the thermal reduction method and characterized by transmission electron microscopy,particle size meter and spectroscopy.Comparing the differences in morphology,size and optical properties of the two particles,the resulted showed that the materials synthesized by glycol was better than xanthophylls and sodium critrate.The absorption peaks of Ag and Ag@SiO2 were both around 447nm.2.Ester-based azobenzene composite phase change materials were modified by ultraviolet light and characterized by spectroscopy and thermogravimetric.The optical and thermodynamic properties of ester-based azobenzenes with different structures were studied.Experimental studies revealed that there were differences in the properties of cis-and trans-azobenzene in terms of visible band absorption,crystallization temperature,melting point,freezing point,and latent heat value.The optical properties of ester-based trans-azobenzene composite phase change materials were studied at different thicknesses.Inversion of liquid optical constants for ester-based azobenzene composite phase change materials were conducted.3.The spectral measurement results showed a stable high transmission trend between 590 nm and 1039 nm,and the transmittance of trans azobenzene was 10%higher than that of cis azobenzene.and he transmittance of 14μm film showed a new transmittance curve.During the inversion process,it was found that the refractive coefficients obtained from the two materials with different thickness were basically the same,and there was a difference in the absorption coefficient in the visible light region,with a small absorption coefficient of less than le-4.4.The transmittance and thermodynamic properties of Ag and Ag@SiO2 nanoparticles doped composite phase change materials were experimentally measured,and it is not possible to directly observe whether particles have isoplasmon resonance in phase change materials.By observing the electric field distribution map calculated by the model,it can be seen that both doped nanoparticles have plasmon resonance effects.By comparing the experimental and computational results,the transmittance can be well matched.