University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science, Polizu 1-3, Bucharest 011061, Romania.
Ultrason Sonochem. 2012 Jul;19(4):909-15. doi: 10.1016/j.ultsonch.2011.12.002. Epub 2011 Dec 23.
The effect of ultrasonic irradiation (40 kHz) on the calcium carbonate deposition on bacterial cellulose membranes was investigated using calcium chloride (CaCl(2)) and sodium carbonate (Na(2)CO(3)) as starting reactants. The composite materials containing bacterial cellulose-calcium carbonate were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and color measurements. The polymorphs of calcium carbonate that were deposited on bacterial cellulose membranes in the presence or in the absence of ultrasonic irradiation were calcite and vaterite. The morphology of the obtained crystals was influenced by the concentration of starting solutions and by the presence of ultrasonic irradiation. In the presence of ultrasonic irradiation the obtained crystals were bigger and in a larger variety of shapes than in the absence of ultrasounds: from cubes of calcite to spherical and flower-like vaterite particles. Bacterial cellulose could be a good matrix for obtaining different types of calcium carbonate crystals.
采用氯化钙（CaCl(2)）和碳酸钠（Na(2)CO(3)）作为起始反应物，研究了超声辐射（40 kHz）对细菌纤维素膜上碳酸钙沉积的影响。通过扫描电子显微镜（SEM）、X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和颜色测量对含有细菌纤维素-碳酸钙的复合材料进行了表征。在存在或不存在超声辐射的情况下，沉积在细菌纤维素膜上的碳酸钙的多晶型物为方解石和文石。所得晶体的形态受起始溶液浓度和超声辐射的影响。在超声辐射的存在下，得到的晶体比没有超声辐射时更大，形状也更多样：从方解石的立方体到球形和花状的文石颗粒。细菌纤维素可以作为获得不同类型碳酸钙晶体的良好基质。
