Synthesis of Biphasic Calcium Phosphate and its Behaviour in Simulated Body Fluid

The main goal of this study is to elaborate and evaluate the physicochemical properties of the synthetic biphasic calcium phosphate (BCP) powder: an associate compound of hydroxyapatite (HA): Ca10(PO4)6(OH)2 and beta-tricalcium phosphate (β-TCP): Ca3(PO4)2. The new compound BCP has two advantages: high bioactivity (HA) and fast biodegradation (β-TCP). The obtained powder of BCP was prepared by the precipitate method. XRD analysis confirmed the synthetic material contained both HA and β-TCP crystalline phases. SEM images showed that the small particles of HA attached to bigger particles of β-TCP in the structure morphology of BCP. The in vitro experiment was carried out in static condition by soaking of a series of 50 mg BCP powder in 100 ml of simulated body fluid solution at different period of soaking time. The XRD and SEM methods studied the microstructure and chemical bond after soaking. The obtained results confirmed the bioactivity of synthetic BCP material by the formation of a new apatite layer on its surface

Synthesis of Biphasic Calcium Phosphate and its Behaviour in Simulated Body Fluid

The main goal of this study is to elaborate and evaluate the physicochemical properties of the synthetic biphasic calcium phosphate (BCP) powder: an associate compound of hydroxyapatite (HA): Ca10(PO4)6(OH)2 and beta-tricalcium phosphate (β-TCP): Ca3(PO4)2. The new compound BCP has two advantages: high bioactivity (HA) and fast biodegradation (β-TCP). The obtained powder of BCP was prepared by the precipitate method. XRD analysis confirmed the synthetic material contained both HA and β-TCP crystalline phases. SEM images showed that the small particles of HA attached to bigger particles of β-TCP in the structure morphology of BCP. The in vitro experiment was carried out in static condition by soaking of a series of 50 mg BCP powder in 100 ml of simulated body fluid solution at different period of soaking time. The XRD and SEM methods studied the microstructure and chemical bond after soaking. The obtained results confirmed the bioactivity of synthetic BCP material by the formation of a new apatite layer on its surface

Selective flotation separation of ABS/PC from ESR plastic wastes mixtures assisted by ultrasonic catalyst/H2O2

The present study investigated the potential recycles of acrylonitile butadiene styrene terpolymers (ABS) from their blends with polymethylmehtacrylate (PMMA), polyCarbonate (PC) and high impact polyStyrene (HIPS) using flotation separation assisted by ultrasonic catalyst/H2O2. The effect of various factors such as H2O2 dose, duty cycle and contact time of the ultrasonication on the recovery rate and purity of ABS/PC were conducted. The results showed that H2O2 dose significantly influenced on the recovery rate of ABS/PC and the optimized H2O2 dose was found at 2%. The recovery rate and the purity of submerged ABS/PC reached 99.5 and 98.6%, respectively, at 300 s of contact time. The duty cycle and the contact time of the ultrasonification also exhibited highly effective for the recycle of ABS/PC from the plastic waste mixtures. The radical scavengers and the mechanism of flotation separation of ABS/PC by ultrasonic catalyst/H2O2 were proposed. Additionally, the economic potential and environmental impacts were discussed. These findings are crucial for flotation separation of ABS/PC from the plastic waste mixtures assisted by ultrasonic catalyst/H2O2 with high recovery rate and purity of ABS/PC in order to produce further value added products as well as reduce the environmental impact of plastic waste. - 2019 Elsevier Ltd.Scopu

Improvement of hydrogen production under solar light using cobalt (II) phosphide hydroxide co-doped g-C3N4 photocatalyst

Graphitic carbon nitride (g-C3N4) has been extensively studied as a model of photocatalyst material for water splitting. This study investigates potential of cobalt (II) phosphide hydroxide co-doped g-C3N4 (Co-P/C3N4) for solar water splitting to produce hydrogen gas as a clean energy source. Characterizations of the materials were done using X-ray diffraction, Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy, and UV–visible spectroscopy (UV–Vis). Under solar light, the hydrogen production rates per hour using Co-P/C3N4 were 386.8 µmol/g which is 14-fold higher than that of g-C3N4 (28.1 µmol/g). The co-doping of cobalt (II) phosphide hydroxide onto g-C3N4 rapidly improved light harvesting capacity and photo-generated charge carrier separation, leading to increase photocatalytic H2 production. In addition, the reusability of Co-P/C3N4 was confirmed by performing the photocatalytic hydrogen production for five cycles. The material consistently produced H2 without any significant loss in hydrogen productivity. Based on these results, Co-P/C3N4 could be utilized as promising photocatalyst material for production of clean energy.This work was supported by Qatar University under Grant Number GCC-2017-007.Scopu

The effect of Ag-additive on structural and magnetic properties of Fe-Pt alloy thin films

Two series of Fe54Pt46 and (Fe54Pt46)96Ag4 alloy films were deposited by RF-co-sputtering onto oxidized silicon substrates at room temperature. The structural and the magnetic properties of the samples have been investigated in dependence on heat treatment conditions and film thickness. It is worth noting that Ag-additive is demonstrated to be effective to promote the crystallographic ordering and the developing of the (0 0 1) texture in the annealed samples. By controlling the film thickness and the annealing conditions, (0 0 1) oriented Fe–Pt–Ag films can be obtained. The abnormal behavior in the torque curves measured on the annealed samples at moderately high magnetic field can be quite well understood considering the mechanism of the existing exchange spring interaction. It seems reasonable to conclude that Ag-additive plays an important role in the grain growth process, which results in the developing of perpendicular anisotropy in the Fe–Pt alloy thin films