The effect of polyacrylamide on the crystallization of calcium carbonate: Synthesis of aragonite single-crystal nanorods and hollow vatarite hexagons |
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| Institution: | 1. School of Physical Sciences, University of Kent, Ingram Building, Canterbury CT2 7NH, UK;2. School of Earth and Environment, University of Leeds, Leeds LS2, 9JT, UK;3. Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2300 Copenhagen, Denmark;4. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK;5. Elettra Sincrotrone Trieste S.C.p.A., Strada Statale 14, km 163.5, 34149 Basovizza, Ts Italy;1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;2. Institute of Oil & Gas, Peking University, Beijing 100871, China;3. Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Science, Nanjing 210008, China |
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| Abstract: | CaCO3 nanorods were synthesized via a facile solution route by polymer-controlled crystallization in the presence of polyacrylamide (PAM). The morphology, size and crystal structure were characterized by means of scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). The results suggest that the as-synthesized product was CaCO3 (aragonite) nanorods with diameter ca. 50 nm and length ca. 1 μm. Selected area electron diffraction (SAED) pattern shows the single-crystal nature of CaCO3 nanorods. The reaction time, temperature, pH and reactant concentration were systemically investigated. With the increase in the reaction time, hollow vaterite hexagonal disks can be obtained. |
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