Papers by Keyword: Molybdates

Abstract: Piezo-chromic oxides are able to mark pressure or strain by a drastic color change. In this paper, CoMoO4 molybdate compound and related thermoset composites were prepared in lab. The distribution of CoMoO4 oxide in the thermoset matrix was first investigated via SEM. Moreover, the effects on the thermal and mechanical properties with the addition of CoMoO4 oxide were further analyzed. The piezo-chromic characteristic for CoMoO4 incorporated thermoset composites were verified with compression test. The color change can be clear visualized at a strain level close to the yield point of the composite blends. This study has the potential to open new directions to piezo-chromic polymeric materials as early damage detector.

Abstract: In this work, nano-sized zinc molybdate (ZnMoO4) with several morphologies were prepared through introducing different template agents into hydrothermal system, in which ZnCl2 and Na2MoO4 were used as raw materials. Their structures and morphologies were characterized by XRD, FTIR and SEM techniques. Results showed that after constant temperature of 150°C for 4h, ZnMoO4 nanoparticles (~ 200 nm) were obtained in water medium. While in citric acid, CTAB and EDTA reaction templates, corresponding products were needle-like (400 nm *4000 nm), plate-like(350 nm*1500 nm*2000 nm) and microflower-like assembled by nanorods (300 nm*600 nm), respectively. All of them were monoclinic wolframite-type structure, and their photoluminescent (PL) spectra were also observed.