Figen Kurtuluş

The synthesis of sodium sulfide pentahydrate, Na2S·5H2O, through a solid-gas reaction of sulfidizing gas mixture with sodium carbonate, Na2CO3

In this study, the sulfidization of Na2CO3 was investigated by using a solid-gas reaction under a sulfidizing gas mixture, which consisted of COS, CS2, and S2 gases. Sodium sulfide pentahydrate, Na2S·5H2O, was prepared from sodium carbonate, Na2CO3, via a sulfidizing gas mixture by a solid-gas reaction under the cooling of a nitrogen atmosphere. The observed phase was found to be the pentahydrated form of sodium sulfide. This crystalline form was determined by X-ray powder diffraction (XRD) technique. Since sodium sulfide is strongly hygroscopic, the pentahydrated crystalline form was observed in XRD measurements for all repeated experiments. The crystal unit cell parameters of the synthesized product were in excellent agreement with values given in the JCPDS card number 18-1249. The sodium sulfide pentahydrate has an orthorhombic crystal structure with the unit cell parameters of a = 6.475, b = 12.55, C = 8.655 Å, space group, Cmcm and Z = 4.

Differential in vitro inhibition studies of some cerium vanadate derivatives on xanthine oxidase

Abstract In this preliminary study, a new series of some cerium vanadate derivatives have been investigated as new type of inhibitors of xanthine oxidase (XO; E.C 1.17.3.2). XO is a superoxide-producing enzyme found normally in serum and the lungs, and its activity is concerned with several important health problems such as gout, severe liver damage, vascular dysfunction and injury, oxidative eye injury and renal failure. In this study, we present a critical overview of the effects of these novel type agents on XO with comparing the efficacy and safety profiles of allopurinol, the efficient classical inhibitor of XO.

Fast microwave synthesis and characterization of MgTi2O5

Abstract Magnesium dititanate, MgTi2O5 was obtained via a microwave synthesis method. Powder X-ray diffraction, infrared spectroscopy and thermogravimetric/differantial thermal analysis measurements have been used to characterize the sample.

Hydrothermal Synthesis and Characterization of non‐Linear Optic Potassium Pentaborate(KB5)

Alkali metal borates having outstanding pyhsical properties have drawn much concern, both theoretically and experimentally. Potassium pentaborate stands out of such borates owing to usage of non‐linear optics(NLO) [1]. The reason why the alkali metal borates display non‐linear optical properties is the various coordination possibilities of boron atom [2]. In addition to NLO properties, KB5 can be also used as a film to prevent oxidation, cover fluxes, flame retardant and inhibition of cements [3]. KB5 can be synthesized more easily than the common NLO materials ADP and KDP [4,5]. A number of research articles have been published in the literature discussing the growth and NLO properties of KB5 crystals [6–10]. We synthesized potassium pentaborate tetrahydrate (ICDD: 25‐624) by hydrothermal method in a short time using KOH and H3BO3 as raw materials. The synthesized material was characterization by powder X‐ray powder diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and thermo gravimetric/...