Cold densification and sintering of nanovaterite by pressing with water |
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| Affiliation: | 1. Complex Materials, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland;2. Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany;3. Institute of Inorganic Chemistry, Leibniz University of Hannover, 30167 Hannover, Germany;1. Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, 992-8510, Japan;2. Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-0062, Japan;3. Shiraishi Central Laboratories Co., Ltd., 4-78 Motohama-cho, Amagasaki, 660-0085, Japan;1. Department of Materials Science and Engineering, University of Sheffield, S1 3JD, UK;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi''an, 710049, China;3. Micro-Optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an, 710032, Shaanxi, China;1. College of Electronics Information, Hangzhou Dianzi University, Hangzhou, 310018, China;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK;3. Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK;4. The Henry Royce Institute, Sir Robert Hadfield Building, Sheffield, S1 3JD, UK;5. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China;1. Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA;2. Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA, 16802, USA |
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| Abstract: | While dissolution-precipitation, plastic deformation and fracture have been proposed to explain the compaction of carbonates in geological formations, the role of these mechanisms on the densification process of calcium carbonate nanoparticles in synthetic systems remains poorly understood. Here, we systematically investigate the effect of pH of the aqueous phase (1 ≤ pH ≤ 7), temperature (10 ≤ T ≤ 90 °C), and pressure (10 ≤ P ≤ 800 MPa) on the cold compaction of nanovaterite powder with water to shed light on the mechanisms underlying this unique densification. Compaction experiments reveal that the applied pressure plays a major role on the densification of vaterite nanopowder with water. Our experimental data thus suggest that plastic deformation or subcritical crack growth might be important densification mechanisms for vaterite nanoparticles. These findings provide a new perspective into the cold compaction of nanopowders with water and may open promising routes for the manufacturing of CO2-based structural materials at mild processing conditions. |
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| Keywords: | Cold sintering Vaterite Nanoparticles Pressing Ceramics |
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