Open AccessStudy of the influence between magnesium ions and calcium ions on the morphology and size of coprecipitation in microemulsion
Author(s) -
Wang g,
Yang Lijuan,
Chen Lixuan,
Xiao Rong
Publication year - 2014
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2013.0656
Subject(s) - coprecipitation , microemulsion , magnesium , fourier transform infrared spectroscopy , vaterite , calcium carbonate , chemistry , aragonite , scanning electron microscope , inorganic chemistry , materials science , nuclear chemistry , chemical engineering , organic chemistry , pulmonary surfactant , biochemistry , composite material , engineering
A series of inverse‐microemulsion quasi‐ternary system phase diagrams of CTAB + n ‐butanol + n ‐hexane + brine (MgCl 2 /CaCl 2 ) is systematically drawn by adjusting the ratio of MgCl 2 and CaCl 2 . On this basis, a microemulsion has been prepared with five different molar ratios of magnesium ions to calcium ions, and a calcium carbonate and magnesium carbonate coprecipitation product is obtained by reaction with an equimolar amount of sodium carbonate. The samples were characterised by scanning electron microscopy (SEM), a Fourier transform infrared (FTIR) spectrometer and X‐ray diffraction (XRD). The SEM photographs indicated that when the content of Ca 2+ was higher, some large fusiform aggregates of coprecipitation particles were formed in solution, but with the content of Mg 2+ increased gradually, they eventually formed small and uniform sphere particles. The measurement results of XRD and FTIR indicated that the crystal structures of calcium carbonate in coprecipitation changed gradually from vaterite into aragonite and finally turned into being amorphous with the increasing of the proportion of magnesium ions.