Abstract In this study, CaCO3 nanoparticle/pulp fiber composites were prepared by formation of ultrafine bubbles of CO2 gas in aqueous Ca(OH)2 solution containing beaten or unbeaten pulp fibers. Scanning electron microscopy images of the fiber/CaCO3 composites showed that primary CaCO3 nanoparticles with average diameters of 50–80 nm densely formed on the pulp fiber surfaces. The average sizes and morphologies of the precipitated CaCO3 nanoparticles can be controlled by controlling the CO2 flow rate into the pulp slurry. From dynamic drainage analysis of the CaCO3/pulp slurries with high shear force, retention of the CaCO3 nanoparticles on the pulp fiber mats was ∼10 % higher for the slurry formed by the ultrafine bubble method than for that formed by mixing precipitated CaCO3 and pulp fiber. Therefore, precipitated CaCO3 nanoparticles stably formed on the pulp fiber surfaces in the slurry by the ultrafine bubble method. Compared with reference handsheets, handsheets prepared with the CaCO3 nanoparticle/pulp fiber composites had higher CaCO3 contents and had consequently higher specific surface areas and surface smoothness values. In contrast, the tensile strength and elongation at break decreased because the sheet density decreased with increasing CaCO3 content in the handsheets.

中文翻译：

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超细气泡制备CaCO3纳米颗粒/纸浆纤维复合材料

摘要 在本研究中，通过在含有打浆或未打浆纤维的 Ca(OH)2 水溶液中形成超细 CO2 气泡，制备了 CaCO3 纳米颗粒/浆纤维复合材料。纤维/CaCO3 复合材料的扫描电子显微镜图像显示，在纸浆纤维表面密集形成了平均直径为 50-80 nm 的初级 CaCO3 纳米粒子。可以通过控制进入纸浆的 CO2 流速来控制沉淀的 CaCO3 纳米颗粒的平均尺寸和形态。从具有高剪切力的 CaCO3/纸浆浆料的动态排水分析来看，通过超细气泡法形成的浆料，CaCO3 纳米颗粒在纸浆纤维垫上的保留率比通过混合沉淀的 CaCO3 和纸浆纤维形成的浆料高 10% . 所以，通过超细气泡法在浆料中的纸浆纤维表面稳定形成沉淀的CaCO3纳米颗粒。与参考手抄纸相比，用 CaCO3 纳米颗粒/纸浆纤维复合材料制备的手抄纸具有更高的 CaCO3 含量，因此具有更高的比表面积和表面光滑度值。相反，拉伸强度和断裂伸长率降低，因为随着手抄纸中 CaCO3 含量的增加，纸张密度降低。