Amorphous sulfated zirconium hydroxide was promoted with iron or manganese via the incipient wetness technique, to give 0.5–3.5 weight% promoter in the final catalyst. An exothermic reaction during the calcination temperature ramp (to 823 or 923 K) leads to a rapid overheating (“glow”) of the sample. XRD shows that crystallization starts before and progresses during the overheating. The surface...

BACKGROUND The aim of this study was to evaluate osteogenesis ability of CAD/CAM porous zirconia scaffolds enriched with hydroxy apatite used to augment large boney defects in a dog model. METHODS Surgical defects were made bilaterally on the lower jaw of 12 Beagle dogs. Cone beam CT images were used to create three dimensional images of the healed defects. Porous zirconia scaffolds were fabr...

The [3+2] cycloaddition between various nitriles and sodium azide proceeds smoothly in the presence of zeolite and sulfated Zircona as effective catalyst and in the water and DMF/MeOH, to give the corresponding arylaminotetrazoles in good to high yields. The reaction most probably precedes through the in situ formation of a catalyst azide species, followed by a successive [3+2] cycloaddition wi...

The [3+2] cycloaddition between various nitriles and sodium azide proceeds smoothly in the presence of zeolite and sulfated Zircona as effective catalyst and in the water and DMF/MeOH, to give the corresponding arylaminotetrazoles in good to high yields. The reaction most probably precedes through the in situ formation of a catalyst azide species, followed by a successive [3+2] cycloaddition wi...

Noble Gemini surfactants containing a siloxane moiety have been designed and successfully synthesized in the present study and are utilized as structure-directing agents for mesoporous metal oxides such as zirconia, titania, and vanadia. The siloxane moiety is believed to play an important nano-propping role during the surfactant removal by direct calcination, yielding thermally stable mesoporo...

A new derivative of zirconium (IV), [(acac)2Zr{ONC(Me)th-2}2] have been produced by treating bis(acetylacetonato)diisopropoxy zirconium(IV) with internally functionalised oxime HONC(Me)th-2 (where th = thiophene) in 1:2 stoichiometry, while refluxing in anhydrous toluene. After drying and purification, the product appeared as offwhite crystalline solid. Physico-chemical analysis of this derivat...

Optimization studies for the esterification and transesterification of oil extracted from Croton gratissimus grains were carried out using response surface methodology (RMS) that utilizes central composite design (CCD) analysis variance (ANOVA). A 2 3 full-factorial rotatable CCD three independent variables at five levels was developed in each case, giving a total 20 experiments needed per stud...