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首页> 外文期刊>RSC Advances >Supercritical CO2 drying of alginate/zinc hydrogels: a green and facile route to prepare ZnO foam structures and ZnO nanoparticles
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Supercritical CO2 drying of alginate/zinc hydrogels: a green and facile route to prepare ZnO foam structures and ZnO nanoparticles

机译：海藻酸钠/锌水凝胶的超临界CO2干燥：制备ZnO泡沫结构和ZnO纳米颗粒的绿色便捷路线

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In the present study, we investigate a simple and effective synthetic protocol to produce zinc oxide foams by a facile solution-based method using alginate gelation. The influences of the zinc concentration and the drying process on the structural, textural and morphological properties of the synthesized ZnO nanomaterial were studied and discussed. The components of these nanomaterials were characterized by several techniques to demonstrate the effectiveness of the adopted synthetic route in controlling the growth of the ZnO nanoparticles. XRD analysis revealed that the as-prepared ZnO nanomaterial crystallizes in the hexagonal wurtzite structure. The room temperature photoluminescence (PL) spectra of ZnO show ultra-violet (UV) and visible emissions. SEM analysis revealed the porous texture of the prepared zinc oxide. TEM analysis confirmed the nano dimensions of the synthesized zinc oxide nanoparticles. A comparative study of conventional air drying versus supercritical drying was conducted to determine the influence of each mode of drying on the structural, textural and morphological as well as optical properties of the synthesized ZnO nanoparticles.
机译：在本研究中，我们研究了一种简单有效的合成方案，以藻酸盐胶凝法通过基于溶液的简便方法生产氧化锌泡沫。研究和讨论了锌浓度和干燥工艺对合成的ZnO纳米材料的结构，组织和形貌特性的影响。这些纳米材料的成分通过几种技术进行了表征，以证明所采用的合成途径在控制ZnO纳米颗粒生长方面的有效性。 XRD分析表明，所制备的ZnO纳米材料在六方纤锌矿结构中结晶。 ZnO的室温光致发光（PL）光谱显示紫外线（UV）和可见光发射。 SEM分析显示了所制备的氧化锌的多孔质地。 TEM分析证实了合成的氧化锌纳米颗粒的纳米尺寸。进行了常规空气干燥与超临界干燥的比较研究，以确定每种干燥方式对合成ZnO纳米粒子的结构，组织，形态以及光学性能的影响。

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