Polymorph Selection and Structure Evolution of CaCO<sub>3</sub> Mesocrystals under Control of Poly(sodium 4‑styrenesulfonate):
Synergetic Effect of Temperature and Mixed Solvent
Lei Liu
Jun Jiang
Shu-Hong Yu
10.1021/cg5012132.s001
https://acs.figshare.com/articles/journal_contribution/Polymorph_Selection_and_Structure_Evolution_of_CaCO_sub_3_sub_Mesocrystals_under_Control_of_Poly_sodium_4_styrenesulfonate_Synergetic_Effect_of_Temperature_and_Mixed_Solvent/2239192
The
synergetic effects of water/ethanol mixed solvent and crystallization
temperature upon CaCO<sub>3</sub> polymorph discrimination and structural
assembly under control of poly(sodium 4-styrenesulfonate)
(PSS) were examined. CaCO<sub>3</sub> mesocrystals of all three anhydrous
polymorphs (calcite, aragonite, and vaterite) with progressively developed
morphologies can be selectively realized in one system by consecutively
decreasing the water/ethanol volume ratio (<i>R</i>) at
the proper temperature. At a lower crystallization temperature (10
°C), decreasing the <i>R</i> value resulted in a polymorph
transition of CaCO<sub>3</sub> from pure calcite to pure vaterite,
which was mainly attributed to the increased ethanol content and the
resulting conformation change of PSS molecules. In contrast, CaCO<sub>3</sub> polymorphs changed from pure calcite to almost pure aragonite
at higher crystallization temperature (40 °C), where the temperature
effect was more obvious and became the dominant parameter for CaCO<sub>3</sub> polymorph selection. In addition, a dipole effect was employed
to explain the formation of calcite and vaterite mesocrystals with
continuously and increasingly developed superstructures. This study
could have important implications in the design and preparation of
a great deal of inorganic materials with well-defined morphologies,
polymorphs, and ordered arrangement that can be controlled by simply
adjusting the reaction media and temperature.
2014-11-05 00:00:00
conformation change
temperature effect
calcite
CaCO 3 mesocrystals
ethanol content
Structure Evolution
CaCO 3
CaCO 3 Mesocrystals
CaCO 3 polymorph discrimination
R value
crystallization temperature
Mixed SolventThe synergetic effects
CaCO 3 polymorphs
PSS molecules
polymorph transition
Polymorph Selection
vaterite mesocrystals
reaction media
CaCO 3 polymorph selection