NDLI: Synthesis of hierarchical macro/mesoporous dicalcium phosphate monolith via epoxide-mediated sol

Content Provider	Springer Nature Link
Author	Tokudome, Yasuaki Miyasaka, Akira Nakanishi, Kazuki Hanada, Teiichi
Copyright Year	2010
Abstract	Starting from calcium chloride dihydrate (CaCl$_{2}$·2H$_{2}$O), phosphoric acid (H$_{3}$PO$_{4}$), and poly(acrylic acid) (PAA) dissolved in a mixture of water and methanol (MeOH), dicalcium phosphate anhydrous (DCPA, CaHPO$_{4}$) monoliths with co-continuous macropores and mesopores have been synthesized by the addition of propylene oxide. Macropores are formed as a result of phase separation, while mesopores as interstices between primary particles with the size of ca. 30 nm. Propylene oxide acts as a proton scavenger and leads to moderate pH increase in a reaction solution, which brings about gelation in several minutes. On the other hand, PAA acts as a crystal growth inhibitor as well as a phase separation inducer. The extensive crystal growth of DCPA is hindered by the addition of PAA which allows morphological control of the structure in micrometer range. Fourier transform infrared spectroscopy indicates that PAA and DCPA form composite via interaction between the carboxyl groups and the surface of crystals, and together form gel phase. The solvent phase, which is converted to macropores after evaporative drying, is mainly comprised of solvent. The degree of supersaturation in a reaction solution considerably influence on the crystallization process, and thereby, influences on the porous structure in nano- and micrometer ranges.
Starting Page	269
Ending Page	278
Page Count	10
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	57
Issue Number	3
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2010-03-04
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dicalcium phosphate Macroporous Mesoporous Monolith Phase separation Propylene oxide Optical and Electronic Materials Inorganic Chemistry Ceramics, Glass, Composites, Natural Methods Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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