E-Book, Englisch, Band 271, 217 Seiten, eBook
Reihe: Topics in Current Chemistry
Mineralization Using Synthetic Polymers and Templates
E-Book, Englisch, Band 271, 217 Seiten, eBook
Reihe: Topics in Current Chemistry
ISBN: 978-3-540-46378-8
Verlag: Springer
Format: PDF
Kopierschutz: 1 - PDF Watermark
H. Cölfen: Bio-inspired Mineralization Using Hydrophilic Polymers
S.-H. Yu: Bio-inspired Crystal Growth by Synthetic Templates
K. Naka: Delayed Action of Synthetic Polymers for Controlled Mineralization of Calcium Carbonate
N. Ueyama, K. Takahashi, A. Onoda, T. Okamura, H. Yamamoto: Inorganic-Organic Calcium Carbonate Composite of Synthetic Polymer Ligands with Intramolecular NH…O Hydrogen Bond
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Weitere Infos & Material
Bio-inspired Mineralization Using Hydrophilic Polymers.- Bio-inspired Crystal Growth by Synthetic Templates.- Delayed Action of Synthetic Polymers for Controlled Mineralization of Calcium Carbonate.- Inorganic–Organic Calcium Carbonate Composite of Synthetic Polymer Ligands with an Intramolecular NH···O Hydrogen Bond.
Delayed Action of Synthetic Polymers for Controlled Mineralization of Calcium Carbonate (p. 119-120)
Abstract Natural inorganic–organic hybrid materials are formed through mineralization of inorganic materials on self-assembled organic materials. In these mineralized tissues, crystal morphology, size, and orientation are determined by local conditions and, in particular, the presence of "matrix" proteins or other macromolecules. The final crystalline phase arises through a series of steps initiated by the formation of an amorphous phase that undergoes subsequent phase transformations. The multi-step crystallization process on living systems was supported by the detection of different mineral polymorphs in natural organisms and subsequent phase transformation. This work focuses on a new concept for controlling crystal polymorphs by delayed action of organic additives during nucleation stages. During the formation of continuous thin films of minerals, several authors have used a phase-transformation process from an initially deposited amorphous phase to crystalline phase. The delay addition method gives a new simple process for controlling the CaCO3 crystallization. Three different crystal polymorphs of CaCO3 (aragonite, vaterite, and calcite) were selectively induced by changing the time when the radical initiator was added to a calcium carbonate solution with sodium acrylate. These processes may be similar to the secretion of specific proteins or molecules during the transformation of biomineralization.
Keywords Calcium carbonate · Delay addition · In situ polymerization · Latent inductor · Transformation
Abbreviations
ACC amorphous calcium carbonate
DMSO dimethyl sulfoxide
FT-IR Fourier transform infrared spectroscopy
h hour(s)
KPS potassium peroxodisulfate
L liter(s)
min minute(s)
mol mole(s)
Mw weight average molecular weight
PAA poly(acrylic acid)
PAZO polyazobenzen
PVP poly(N-vinylpyrrolidone)
SEM scanning electron microscopy
TEM transmission electron microscopy
XRD X-ray diffraction
UV ultra violet
1 Introduction
The design of nanomaterials, in other words, hybrid materials, has emerged as one of the most exciting areas of scientific effort in this decade. Among various research fields aimed at constructing nanomaterials, organic–inorganic hybrid materials have opened a new horizon in the field of materials science. When different materials are hybridized at the nano-meter scale, the obtained hybrid materials show unique properties compared with microscale composites [1–3]. Organic–inorganic hybrids have been elaborated with various inorganic hosts such as inorganic clay compounds [4], metal oxo clusters [5], oligosilsesquioxanes and their derivatives [6], zeolite [7], and metal [8] nanoparticles. Among them, sol-gel reaction of metal alkoxides is a widely used technique for the preparation of the organic–inorganic hybrid materials [9–11]. One of the most important advantages of the sol-gel process for preparation of the hybrids is the milder process compared with the normal glass preparation method. The mild characteristics offered by the sol-gel reaction allow the introduction of organic components inside the inorganic network. Organic–inorganic polymer hybrids can be prepared by mixing organic polymer into the sol-gel reaction. To obtain homogeneous organic– inorganic hybrids, in which the organic polymer is dispersed in the inorganic matrix at the nano or molecular scale, increased compatibility between the organic polymer and inorganic phases is necessary. The introduction of covalent bonds or chemical and physical interactions between the organic polymers and the inorganic units are efficient at increasing compatibility.
