Preparation of Cordierite Ceramics from Metal Alkoxides (Part 2)

Preparation of Carboxylato-Coordinated Titanium Alkoxides from Carboxylic Anhydrides: Alkoxido Group Transfer from Metal Atom to Carbonyl Group

Reaction of titanium(IV) isopropoxide, Ti(OiPr)4, with an equimolar amount of phthalic anhydride resulted in the transfer of an isopropoxido group from the metal atom to one carbonyl group of the anhydride and coordination of the thus formed monoester to the titanium atom. One monoester ligand in Ti2(OiPr)6(μ2-OOC-C6H4-COOiPr)(η1-OOC-C6H4-COOiPr)(iPrOH) is bridging and the other is η1-coordinat...

Microwave Sintering of Ceramics for Dentistry: Part 2

Each tooth was then placed upon the reticulated zirconia in the thermal containment box and the technique of Microwave Hybrid Heating (MHH) was applied. The temperature measurements were taken every two minutes. We attempted to sinter the teeth in the microwave furnace with both fast and gradual heating rate (per minute) by manipulating the power rate. The power was increased gradually for few ...

Preparation of Higly Porous Hydroxyapatite Ceramics from Cuttlefish Bone

Abstract: Hydroxyapatite, Ca10(PO4)6(OH)2, has been widely investigated for medical purposes because it is suitable for either direct clinical use as implants or tissue-engineering applications. In this work materials were successfully produced via hydrothermal transformation of aragonite, obtained from fresh cuttlefish bones, at 200°C and high pressures. Beyond low production cost, worldwide a...

Preparation of High Purity Mullite Ceramics

Preparation of the Phencyclidine Analogues (Part II)

Using a-tetralone, as starting material, a series of phencyclidine analogues were synthesized. This ketone was reacted separately with ethylmagnesium bromide, P-methoxyphenylmagnesium bromide and P-methylphenylmagnesium bromide. The resultant alcohols were treated with a suspension of NaN3 and CCl3COOH in CHCl3. The azides were subsequently...