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The effect of zinc oxide (ZnO) addition on the physical and morphological properties of cellulose aerogel beads

机译：氧化锌（ZnO）添加对纤维素气凝胶珠的物理性质的影响

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摘要

Microsized open porous beads of cellulose were made using the dissolution medium containing mixtures of 7 wt% NaOH and 12 wt% urea and additionally various concentrations of ZnO to study its effect on physical and morphological properties of the cellulose beads formed. It has been observed that such cellulose aerogel beads prepared with lower concentrations of ZnO show shrinkage while drying whereas beads prepared with higher concentrations of ZnO do not exhibit much shrinkage. The dried cellulose aerogel beads were spherical with diameters between 2 and 2.5 mm. The skeletal density of all dried cellulose beads was measured as 1.5 g cm~(-3). FT-IR spectra reveal that the structure of cellulose I transformed to cellulose II during dissolution and regeneration in a coagulation medium, which was also confirmed from XRD measurements. The beads prepared with a NaOH/urea/ZnO aqueous solution exhibit better thermal stability. We found that the addition of 0.5 wt% ZnO to the NaOH/urea mixture greatly increased the specific surface area of the cellulose beads up to 407 m2 g~1 compared to control cellulose beads (341 m2 g~1). SEM images indicate that a dense nano-fibrillar network structure was formed in the interior of the cellulose aerogel beads prepared with 0.5 wt% ZnO.
机译：使用含有7wt％NaOH和12wt％尿素的混合物的溶解培养基制​​备纤维素的微晶开放多孔珠，并另外各种浓度的ZnO研究其对形成的纤维素珠的物理和形态学性质的影响。已经观察到，这种用较低浓度的ZnO制备的纤维素气凝胶珠粒在干燥时呈收缩，而用更高浓度的ZnO制备的珠子不会表现出很多收缩。干燥的纤维素气体珠子是球形的，直径在2到2.5mm之间。测量所有干燥的纤维素珠粒的骨骼密度为1.5g cm〜（-3）。 FT-IR光谱显示，在溶解和再生期间，在凝血介质中转化为纤维素II的纤维素II的结构，也从XRD测量中证实。用NaOH /脲/ ZnO水溶液制备的珠子表现出更好的热稳定性。我们发现，与对照纤维素珠（341m 2 G〜1）相比，向NaOH /尿素混合物中加入0.5wt％ZnO至NaOH /尿素混合物的比表面积高达407m 2 G〜1的比例。 SEM图像表明，在用0.5wt％ZnO制备的纤维素气凝胶珠粒的内部形成致密的纳米纤维网结构。

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  • 来源
    《RSC Advances》 |2015年第109期|共9页
  • 作者

    Seeni Meera Kamal Mohamed; Kathirvel Ganesan; Barbara Milow;

  • 作者单位

    Institute of Materials Research German Aerospace Center (DLR) Department of Aerogels Linder Hoehe 51147 Cologne Germany.;

    Institute of Materials Research German Aerospace Center (DLR) Department of Aerogels Linder Hoehe 51147 Cologne Germany.;

    Institute of Materials Research German Aerospace Center (DLR) Department of Aerogels Linder Hoehe 51147 Cologne Germany.;

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  • 正文语种 eng
  • 中图分类 化学;
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