Exploration Of Mixed Solvent Method And Preparation Characterization Of Carbonate Particles And Sulphide Nanoparticles

The structure, morphology and size of material tend to influence or determine thematerial properties and applications. To develop effective methods for achieving thecontrolling of material structure, morphology and size has gradually become one of theimportant subject of materials science. As a novel method for preparing materials withspecific composition and microscopic particles specific structure and morphology,mixed solvent method has been widely studied.In this paper, water was used as inorganic solvents, ethanol, acetone were organicsolvents. The mixed solvent could be gotten by changing the proportion of inorganicsolvents and organic solvents. The impact of changes of the mixed solvent on its ownnature and impact on the structure and morphology of different matters were studiedwith Scanning electron microscopy (SEM) and X-ray diffraction (XRD) Furthermore,UV-Vis-NIR s pectrometer and photothermal evaluation system were applied toanalyze the optical property and photothermal performance of the PbS products. Theresults are as follows:1. Four carbonate nanoparticles were prepared by changing the proportion ofalcohol-water mixed solvent. It is worthy emphasizing that when the characterizationof carbonate particle size, we found that with increasing of organic components in themixed solvent, the particle size obtained became smaller and this variation wasconsistent with the law of the surface tension of the mixed solvent.We analysised of the reasons for this phenomenon by Ostwald ripening theory, Ostwald-Freundlishequation and the Formula of supersaturation with solubility product constant. Exploredthe changes in the ratio of ethanol and water how to lead to the changes of solventinterfacial tension, supersaturation and solubility.2. Four kinds of sulfide semiconductor nanoparticles were prepared by changingthe proportion of alcohol-water mixed solvent. It is worthy emphasizing that when thecharacterization of sulfide semiconductor nanoparticles size, we found that withincreasing of organic components in the mixed solvent, the particle size obtainedbecame smaller and this variation was consistent with the law of the surface tension ofthe mixed solvent3. UV-Vis-NIR s pectrometer and photothermal evaluation system were applied toanalyze the optical property and photothermal performance of the PbS products.1) The as-prepared product exhibits fairly well property of light absorption inultraviolet, visible, near infrared bands, especially at1000-1200nm.2)The solid content of the samples has an effect on the photothermal conversionperformance. The absorption of light and photothermal properties is proportional to thesolid content.3) The sample size can affect the photothermal conversion performance. As thesample size increases in a certain range, the temperature difference became greater.Showed that with the increase of partical size in a certain range, the light-heatconversion rate becomes higher.