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A Novel Layered Silicate with a Helical Morphology
Author(s) -
Akiyama Yoshikatsu,
Mizukami Fujio,
Kiyozumi Yoshimichi,
Maeda Kazuyuki,
Izutsu Hiroyuki,
Sakaguchi Kengo
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19990517)38:10<1420::aid-anie1420>3.0.co;2-6
Subject(s) - silicate , tetramethylammonium , morphology (biology) , hydrothermal circulation , sodium silicate , scanning electron microscope , tetramethylammonium hydroxide , materials science , chemical engineering , hydrothermal synthesis , hydroxide , ion , molecule , sodium hydroxide , phase (matter) , crystallography , mineralogy , chemistry , inorganic chemistry , nanotechnology , organic chemistry , geology , composite material , paleontology , engineering
Helices composed of stacked layers are present in the novel silicate obtained from a silica sol and NaOH by hydrothermal synthesis in the presence of tetramethylammonium (TMA) hydroxide and 1,4‐dioxane. The helical morphology is evident in scanning electron micrographs (see picture). The TMA and sodium ions of the silicate are readily replaced by protons, and on heating to 200°C a reversible phase transition occurs in which water molecules are lost from between the layers.