Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Surface Modification and Planar Defects of Calcium Carbonates by Magnetic Water Treatment | Nanoscale Res Lett 2010 5 1982-1991 DOI s11671-010-9736-5 NANO EXPRESS Surface Modification and Planar Defects of Calcium Carbonates by Magnetic Water Treatment C. Z. Liu C. H. Lin M. S. Yeh Y. M. Chao P. Shen Received 7 June 2010 Accepted 5 August 2010 Published online 18 August 2010 The Author s 2010. This article is published with open access at Abstract Powdery calcium carbonates predominantly calcite and aragonite with planar defects and cation-anion mixed surfaces as deposited on low-carbon steel by magnetic water treatment MWT were characterized by X-ray diffraction electron microscopy and vibration spectroscopy. Calcite were found to form faceted nanoparticles having 3x 0Ĩ14 commensurate superstructure and with well-developed 1120 and 1014 surfaces to exhibit preferred orientations. Aragonite occurred as laths having 3x 011 commensurate superstructure and with well-developed 011 surface extending along 100 direction up to micrometers in length. The hkil -specific coalescence of calcite and rapid lath growth of aragonite under the combined effects of Lorentz force and a precondensation event account for a beneficial larger particulate colony size for the removal of the carbonate scale from the steel substrate. The coexisting magnetite particles have well-developed 011 surfaces regardless of MWT. Keywords Calcium carbonate Nanoparticle Magnetic water treatment Surface modification Superstructure TEM Introduction Since the first patent registration by Vermeiren 1 magnetic water treatment MWT plays an increasingly C. Z. Liu C. H. Lin P. Shen Department of Materials and Optoelectronic Science National Sun Yat-sen University Kaohsiung Taiwan e-mail pshen@ M. S. Yeh Y. M. Chao China Steel Incorporation T64 Kaohsiung Taiwan important industrial role regarding scale control and amelioration of dispersion separations in hard water with troublesome deposition of calcium carbonate sulfate and or silica. The .
