• LI-XIA YANG

      Articles written in Bulletin of Materials Science

    • Shape control synthesis of low-dimensional calcium sulfate

      Li-Xia Yang Yan-Feng Meng Ping Yin Ying-Xia Yang Ying-Ying Tang Lai-Fen Qin

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      Calcium sulfate nanorods, nanowires, nanobelts and sheets had been synthesized via a facile solution reaction of CaCl2 and H2SO4 in mixed solvents of ethanol/𝑁, 𝑁-dimethylformamide and deionized water at 35°C. The results indicated that well-crystallized CaSO4 nanomaterials with different morphology were obtained by adjusting the volume ratio of ethanol/𝑁, 𝑁-dimethylformamide to deionized water and the reaction time. Samples prepared at 35°C in mixed solvents of 50 mL ethanol and 30 mL water for 1 min and 2 h showed nanowire and sheet morphology, respectively. While increasing the volume ratio of ethanol to deionized water to 78/2, only nanorods were obtained. When 𝑁, 𝑁-dimethylformamide was employed to substitute ethanol, the sample heating at 35°C for 2 h was composed of nanowires in 50 mL 𝑁, 𝑁-dimethylformamide and 30 mL water. Higher volume ratio of 𝑁, 𝑁-dimethylformamide to deionized water caused the formation of nanorods.

    • Melt-assisted synthesis to lanthanum hexaboride nanoparticles and cubes

      CHUN-LIANG HANG LI-XIA YANG FENG WANG YAN-BIN XU CHEN-YU YI

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      Lanthanum hexaboride (LaB$_6$) nanocrystals and cubes were successfully synthesized at 700$^{\circ}$C for 2 h underargon atmosphere by a melt-assisted method using LaCl$_3$ and NaBH$_4$ as reactants, NaCl–KCl or zinc or NaCl–KCl–zincas reaction melt. The obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM) and Raman spectroscopy. XRD patterns and Raman spectra confirmedthe formation of LaB6 with high purity. TEM and SEM results showed LaB6 powders prepared in mixed molten salts ofNaCl–KCl were mainly composed of nanoparticles with sizes of ca. 8 nm. The morphology of LaB$_6$ presented as regularcubes (100–300 nm) when metal zinc was used as reaction melt. Photothermal conversion test indicated that nanoparticleshad a better photothermal conversion performance than cubes.

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