Production of nano CaCO3 by carbonization route için kapak resmi
Production of nano CaCO3 by carbonization route
Molva, Murat.
Yazar Ek Girişi:
Yayın Bilgileri:
[s.l.]: [s.n.], 2011.
Fiziksel Tanımlama:
xxiii, 181 leaves.: ill. + 1 computer laser optical disc.
Calcium carbonate (CaCO3) is one of the most abundant materials in nature and widely used as filling material in various industries in order to decrease the product costs and to improve some mechanical properties of the composite materials. Because commercial calcite sold in the market is in granular form, in micron size, and inhomogeneous size distribution, the required properties can only be obtained by the recrystallization method. However, because the crystallization is an ionic reaction, there is not a standard procedure to obtain calcite in nano size, monodisperse, and different nano CaCO3 by the carbonization route. In order to understand the progress in crystal formation, crystals were synthesized by the chemical method by slow or fast addition of reactant into the solution. A mini reactor was built in a Ca(OH)2 solution for the carbonization method and reproducible results were obtained. During the precipitation reactions, pH and conductivity of the solutions were monitored. Particles were separated by centrifugation and dried at 103 oC in an oven overnight. Morphological characteristics of the precipitated CaCO3 samples were analyzed by SEM, XRD and FTIR. On the basis of XRD and FTIR analyses, the main crystal form of the precipitated samples was found to be calcite. Colloidal stability tests revealed that these nano particles do form aggregates. It was shown that the crystallization occurs on the surfaces of both the undissolved Ca(OH)2 particles and on the already grown CaCO3 particles as nano calcite evidenced from the XRD patterns of the samples. It was also observed that, in the late stage of the crystallization, because the pH decreased, the morphology of the particles was affected, indicating that erosion took place on the surface due to ionization. The effects of the enzyme, carbonic anhydrase, polyurethane foam, and organic solvents such as methanol, ethanol, toluene, hexane and benzene were also studied. It was observed that, in the presence of solvents nano crystals can be synthesized in the form of calcite, which were mostly monodisperse particles.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Doctoral)--İzmir Institute of Technology: Chemical Engineering.

İzmir Institute of Technology: Chemical Engineering --Thesis (Doctoral).
Elektronik Erişim:
Access to Electronic Version.


Materyal Türü
Demirbaş Numarası
Yer Numarası
Durumu/İade Tarihi
Tez T000943 TP245.C3 M72 2011

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