Synthesis and characterization of calcium ultra-and oxyphosphates

Toprak, Muhammet S.


Synthesis and characterization of rare earth borophosphates
Özdil, Yasemin; Kızılyallı, Meral; Department of Chemistry (2004)
In this thesis, solid state reactions of Ln2O3, Y2O3, B2O3 and (NH4)2HPO4 were investigated to synthesize LnBP2O8 (Ln= Dy, Ho, Er) and YBP2O8 type of borophosphates which were not reported before. The products were analyzed by XRD, IR, DTA, SEM and EDX methods. In the first part of this thesis, synthesis of YBP2O8 through the solid state reaction of Y2O3 + 4(NH4)2HPO4 + B2O3 have been studied in the range 800-1140 °C. Orthophosphates of Dysprosium, Holmium, Erbium and Yttrium have tetragonal xenotime (YPO4)...
Synthesis and characterization of zeolite beta
Tamer, Nadir Hakan; Yücel, Hayrettin; Department of Chemical Engineering (2006)
Zeolite beta has been synthesized using hydrothermal methods. In order to synthesize zeolite beta an aqueous gel having a molar batch composition of 2.2 Na2O Al2O3 x SiO2 4.6 (TEA)2O 444 H2O was utilized. The synthesis parameters were SiO2/Al2O3 ratio (20 ≤ x ≤ 50) and crystallization time (6 ≤ t ≤ 16 days). Pure zeolite beta was crystallized from the experiments which were performed with the batch composition having SiO2/Al2O3 of 20 and 30 in 6 to 16 days period. For SiO2/Al2O3 of 20 and 30, the highest yi...
Synthesis and Characterization of a Luminol Based Chemiluminescent Trimeric System
Kesimal, Busra; Balci, Burcu; Çakal, Deniz; Önal, Ahmet Muhtar; Cihaner, Atilla (2023-01-01)
A luminol based chemiluminescent trimeric system, namely 2,3-dihydro-5,8-di(thiophen-2-yl)phthalazine-1,4-dione (T2B-Lum), bearing thiophene rings as donor units and 2,3-dihydrophthalazine-1,4-dione as an acceptor unit was synthesized in two steps via donor-acceptor-donor approach using two different methods. It was found that T2B-Lum emits chemiluminescent light when exposed to H2O2 in a basic medium, and the presence of substituents and the type of aromatic ring bearing chemiluminescent active group have ...
Synthesis and characterization of thiophene-capped polytetrahydrofuran conducting copolymers
Unur, E; Toppare, Levent Kamil; Yagci, Y; Yilmaz, F (Elsevier BV, 2005-06-15)
Living polytetrahydrofuran (PTHF) was terminated with sodium thiophenemethonate to yield a polymer with thiophene groups at both ends. Copolymerizations of PTHF with pyrrole and thiophene were achieved in water-p-toluene sulfonic acid (PTSA) and acetonitrile (AN)tetrabutylammonium tetrafluoroborate (TBAFB) solvent-electrolyte couples via constant-potential electrolysis. The electrical conductivities were measured by the four-probe technique. The PTHF/PTh film,, which was deposited on indium tin oxide (ITO) ...
Synthesis and characterization of fluorine-substituted polyanilines
Cihaner, A; Önal, Ahmet Muhtar (Elsevier BV, 2001-09-01)
Poly(2-fluoroaniline), P2FAN, poly(3-fluoroaniline). P3FAN. and poly(4-fluoroaniline), P4FAN, have been synthesized from fluorine substituted aniline monomers in aqueous acidic medium using potassium dichromate as oxidizing agent. Characterization of polymer products has been carried out using FTIR, and NMR spectroscopic techniques. Thermal analysis of polyfluoroaniline powders was also investigated using differential scanning calorimetry and thermogravimetric analysis. To compare the structural properties ...
Citation Formats
M. S. Toprak, “Synthesis and characterization of calcium ultra-and oxyphosphates,” Middle East Technical University, 1997.