Silver influence of physical and thermo luminescence properties on lithium-Strontium-borate LSBO: Ag exposed to cobalt-60 gamma ray

This work investigates the properties of glow curve of lithium Strontium borate doped sliver glass (LSBO: Ag), subjected to Co-60 gamma irradiation. The glass samples were prepared in different compositions based on 15%Li2CO3+2%SrCO3 (83-x) H3BO3 +xAgNO3, where x = 0.001, 0.003, 0.005, 0.007, 0.009 and 0.01 mol% by traditional melting quenching method at temperature 1300 °C for 1 hour. The structural pattern of glass samples has been identified by X-ray diffraction. The XRD pattern shows that the samples are glasses since there is broader peak appearing in the spectral pattern. FESEM images verify the homogeneous and transmitting surface morphology of all samples. Stable glasses with Hurby parameter ~ 0.5 are achieved. EDX spectra determine the accurate elemental compositions in the samples. Physical properties are determined in terms of glass density, molar volume, polar on radius, inter-nuclear distance, and ion concentration. Glass density is found to increase from 2.45 to 2.46 g cm-1 after addition of AgNO3 concentration. The TL intensity at different compositions of lithium borate doped sliver glass after exposed to 50 Gy Co-60 gamma-rays is presented. The results clearly show that the highest TL intensity is found in glass composition of 0.09 mol% of AgNO3

Synthesis and Antioxidant Activities of Novel 5-Chlorocurcumin, Complemented by Semiempirical Calculations

The novel curcumin derivative (1E,4Z,6E)-5-chloro-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta-1,4,6-trien-3-one (5-chlorocurcumin) was prepared from natural curcumin. The newly synthesised compound was characterised by spectral studies (IR, 1H NMR, and 13C NMR). The free radical scavenging activity of 5-chlorocurcumin has been determined by measuring interaction with the stable free radical DPPH, and 5-chlorocurcumin has shown encouraging antioxidant activities. Theory calculations of the synthesised 5-chlorocurcumin were performed using molecular structures with optimised geometries. Molecular orbital calculations provided a detailed description of the orbitals, including spatial characteristics, nodal patterns, and the contributions of individual atoms

Correlation of Total Cholesterol and Glucose in Serum of Iraqi Patients with Atherosclerosis and Diabetes Mellitus Type 2

Cholesterol is a fatty substance (lipid) classified as a waxy steroid of fat. It is absorbed by the intestine into blood stream and is packaged inside a protein coat a chylomicron. Blood glucose is a simple monosaccharide absorbed directly into the blood stream during digestion. The level of blood glucose normally represents a balance between the inflow of glucose into blood and it is uptake by the tissue. Atherosclerosis is a general term for a number of different medical conditions that affect the heart, this is occurs when the blood supply to a part of heart is interrupted, must commonly due to plaque, is build up in the coronary arteries consist of lipid cholesterol and calcium. It causes a damage of potential disease of heart muscle due to thickening and hardening of arteries. Diabetes mellitus is a disorder in which the level of blood glucose is persistently elevated above the normal range due to decrease secretion of insulin. The main objective of this study is to determine the concentrations of total cholesterol and glucose into blood serum of Iraq patients with atherosclerosis and diabetes mellitus type 2. This study included 60 specimens of patients with atherosclerosis and 60 patients with type 2 diabetes mellitus; their age range was 45-65 years. These patients were then matched by age and sex to 30 healthy individuals. Results revealed that there was highly significantly increased in the mean value of total cholesterol and glucose concentrations in patients of atherosclerosis (p<0.001) and diabetes mellitus (p<0.001) as compared with healthy individuals

A new strontium/copper co-doped lithium borate glass composition with improved dosimetric features

We report the improved dosimetric properties and kinetic parameters of a newly synthesized strontium/ copper co-doped lithium borate glass composition (LB:Sr,Cu). Co-dopants concentration dependent glow curve shape, Thermoluminescence (TL) sensitivity, TL dose response, minimum detectable dose, fading and reproducibility, annealing, order of kinetics, activation energy, and frequency factors are determined. Proposed dosimeter exhibited simple glow curve, good linearity in the dose range of 0.5-4, 1-10 and 10-100 Gy (Co-60 gamma irradiation), easy annealing attributes, excellent reproducibility, and minimal fading. These attractive features of the prepared glass composition are prospective for radiation dosimetry applications

Strontium ions concentration dependent modifications on structural and optical features of Li4Sr(BO3)3 glass

Composition optimization is essential for achieving improved properties of strontium (Sr2+) doped lithium borate (LSBO) glass. Glasses with compositions (85-x)H3BO3+15Li2CO3+xSrCO3, where x = 0.5-2.5 mol% are synthesized via melt quenching technique. Glasses are characterized to determine Sr2+ ions concentration dependent improvements in the structural, physical, and optical properties. XRD patterns verifies the amorphous nature, FESEM images reveals transmitting surface morphology, stable glasses with Hurby parameter ∼0.5 are achieved. FTIR spectra revealed three fundamental peaks around 700.55-930.68 and 1072.07 cm-1, which corresponded to the trigonal and tetrahedral stretching vibrations of BO3 and BO4 units. These peaks are shifted with the increase of modifier concentration. Energy for Urbach tail, direct and indirect optical gaps are calculated. The increasing glass refractive index from 2.34 to 3.00 is ascribed to the conversion of BO4 into BO3 units. Emission spectra exhibit three peaks centered at 492.65, 536 and 549 nm, corresponding to the transitions from the 1D2, 3D3 and 3D2 levels to ground state 1S0 respectively, and accompanied by a slight blueshift attributed to the formation of new complexes. Effects of strontium ion contents on the structural and optical properties are demonstrated. Our observation may contribute towards the development of LSBO based glass photonics

Structural and optical properties of strontium/copper co-doped lithium borate glass system

There is continuous search for materials having superior optical and structural properties in glass photonics, thermoluminescence dosimetry and phosphors fields. A new series of copper (Cu)/strontium (Sr) co-doped lithium borate glasses (LB:Sr, Cu) of composition (85 - x)H3BO3-15Li2CO3-2SrCO3-xCu2O, where x = 0.005 to 0.1 mol% were prepared using melt quenching method. Synthesized glasses are characterized to determine the concentration's effect of copper ions (Cu2+) on modification of the structural and optical properties. XRD patterns confirmed the amorphous nature and FESEM verified the homogeneous surface morphology. EDX spectra authenticated the accurate elemental traces. Glasses are thermally stable with Hurby parameter ~0.5. Glass density decreases with the increasing Cu2+ concentration. FTIR peaks in the range of 698-1070 cm-1 attribute to trigonal and tetrahedral stretching vibrations of BO3 and BO4 units. The direct/indirect band gap and Urbach energy vary from 3.1-2.8 eV/2.94-2.84 eV and 1.2-2.18 eV, respectively. The observed increase in refractive index ascribed to the conversion of BO4 into BO3 units. PL spectra under 280 nm excitations display two peaks centered at 482 and 526 nm accompanied by slight peak shift towards the lower wavelength. Excellent structural and spectroscopic characteristics of the present glass compositions indicate prospects for various photonic devices

Thermodynamic and Theoretical Study of the Preparation of New Buckyballs from Corannulene, Coronene, and Circulene

We applied density functional theory (DFT) to study three polycyclic aromatic compounds (PAHs), corannulene, coronene, and circulene, for the preparation of twelve new buckyballs with molecular dimensions of less than a nanometer. The results showed that the corannulene molecule is bowl-shaped, the coronene molecule is planar, and the circulene molecule has a unique saddle-shaped structure. Cyclic polymerization of the three molecules can be used to prepare new buckyballs, and this process produces hydrogen molecules. The most symmetric buckyball is also the most stable based on the values of the HOMO energy levels and has the most efficient gap energy, making it potentially useful for solar cell applications