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Simultaneous control of particle size and morphology of α‐Ca SO 4 ·1/2H 2 O with organic additives
Author(s) -
Guan Qingjun,
Sun Wei,
Hu Yuehua,
Yin Zhigang,
Zhang Chenhu,
Guan Changping,
Zhu Xiangnan,
Ahmed Khoso Sultan
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16177
Subject(s) - particle size , nucleation , supersaturation , crystal (programming language) , morphology (biology) , particle (ecology) , porosity , chemical engineering , flue gas desulfurization , chemistry , succinic acid , mineralogy , grain size , materials science , crystallography , composite material , organic chemistry , oceanography , biology , computer science , engineering , genetics , programming language , geology
Here we reported a method to simultaneously control the particle size and morphology of α‐Ca SO 4 ·1/2H 2 O (α‐ HH ) prepared from flue gas desulfurization gypsum by adjusting the succinic acid concentration and glycerol content under mild conditions. Succinic acid controlled the crystal morphology by adsorption onto α‐ HH surfaces, and glycerol controlled the crystal particle size, in which an increase in the maximal relative supersaturation ( S max ) and nucleation rate of α‐ HH was hypothesized to cause the change in α‐ HH particle size. Then, based on the method, α‐ HH with different particle sizes but with almost the same morphology was prepared, and the influence of the crystal particle size on the mechanical strength of the α‐ HH pastes was explored. With decreasing α‐ HH particle size from about 26 to 5 μm, the dry compressive strength of the pastes made from the α‐ HH decreased remarkably from 68.02 to 34.85 MPa, which was ascribed to an increase in the internal porosity of the pastes.