A Simple Route to Ruthenium Sulfide Nanoparticles via Thermal Decomposition of Precursor Complexes

2018 ◽  
Vol 54 ◽  
pp. 158-171 ◽  
Author(s):  
Johannes Z. Mbese ◽  
Peter A. Ajibade
Keyword(s):  
Optical Band Gap ◽  
Research Work ◽  
1H And 13C Nmr ◽  
Cubic Crystal ◽  
Simple Route ◽  
Molecular Precursors ◽  
Tauc Plot ◽  
Ftir Studies ◽  
Ruthenium Sulfide ◽  
Scale Range

The research work presented here investigate the use of homonuclear tris-dithiocarbamato ruthenium(III) complexes as single-source molecular precursors to ruthenium sulfide nanoparticles. The dithiocarbamate ligands with their respective precursor complexes were characterized by UV-Vis, FTIR, 1H- and 13C-NMR, and in addition TGA was used for precursors. The absorption spectra confirmed the geometry of tris-chelate ruthenium complexes [Ru(S2CNR2)3] to be octahedral and were very stable both in solution and in the solid state. The optical and structural properties of the ruthenium sulfide nanoparticles were examined using FTIR, XRD, EDS, SEM, TEM, UV-Vis and photoluminescence (PL). FTIR studies revealed that Ru2S3 nanoparticles are capped through the interaction of the –NH2 group of hexadecylamine (HDA) adsorbed on the surfaces of nanoparticles with the prominent band observed around 3330 cm-1 due to v(N-H). The XRD confirmed the successful formation of ruthenium sulfide nanoparticles with a cubic crystal structure within the nano-scale range. The optical band gap(Eg) determined from Tauc plot was found in the range (3.44 to 4.18 eV) values.

scholarly journals The optical band gap of LiTaO3and Nb2O5-doped LiTaO3thin films based on Tauc Plot method to be applied on satellite

2017 ◽  
Vol 54 ◽  
pp. 012092 ◽  
Author(s):  
R Estrada ◽  
N Djohan ◽  
D Pasole ◽  
M Dahrul ◽  
A Kurniawan ◽  
...  
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Tauc Plot

scholarly journals Optical Properties of Silver-Vanadium-Phosphate Glasses

2017 ◽  
Vol 16 (1) ◽  
pp. 1-7
Author(s):  
B Eraiah
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Phosphate Glasses ◽  
Vanadium Phosphate ◽  
Tauc Plot ◽  
Uv Visible ◽  
Oxide Ions

The glasses with the composition of xAg2O-50V2O5-(50-x)P2O5 (where x = 5,10,15,20,30 and 40 mol%) were synthesized using melt quenching technique and their optical properties were carried out through UV-Visible spectrophotometer. The absorption spectra of these glasses were recorded at room temperature in the wavelength range 200-1100nm. The optical band gap energies were calculated using Tauc plot. The calculatedenergy band gap values are ranging from 2.075 to 2.834 eV. The refractive index and polarizabilities of oxide ions have been calculated using Lorentz-Lorentz relation. The calculated refractive index and polarizabilities of these glasses in the range of 2.443 to 2.703 and 9.8877×10-24 to 13.590×10-24cm3.

scholarly journals Antiproliferative Effects of Alkaloids from the Bulbs of Crinum abyscinicum Hochst. ExA. Rich

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Besufekad Abebe ◽  
Solomon Tadesse ◽  
Ariaya Hymete ◽  
Daniel Bisrat
Keyword(s):  
Antiproliferative Activity ◽  
Research Work ◽  
Annexin V ◽  
S Phase ◽  
Double Staining ◽  
1H And 13C Nmr ◽  
Antiproliferative Effects ◽  
Phytochemical Investigation ◽  
Internal Parasites ◽  
Antiproliferative Activities

Crinum abyscinicum Hochst. ExA. Rich bulb is traditionally used in Ethiopia for the treatment of various ailments including internal parasites, mastitis, rabies, colic diseases of animals, and cancer. Despite its importance in traditional cancer treatment, no research work has been reported on the antiproliferative activity of the bulb extract and its major constituents. Phytochemical investigation of the bulb extract of C. abyscinicum by PTLC over silica gel resulted in the isolation of two alkaloids, which were unequivocally identified as 6-hydroxycrinamine and lycorine on the basis of 1H- and 13C-NMR and MS analysis. The bulb extract, 6-hydroxycrinamine, and lycorine possessed significant antiproliferative activity, lycorine being the most active exhibiting GI50 values of 2.8 μg/ml and 3.4 μg/ml against A2780 and MV4-11 cells, respectively. Cell cycle analysis and annexin V/propidium iodide double staining in A2780 cells revealed that both compounds increased the percentage of cells in the S-phase at 30 μg/ml without inducing apoptosis. Our results suggest that the antiproliferative activities of the bulb extract of C. abyscinicum, 6-hydroxycrinamine, and lycorine could support the traditional claim of the plant against cancer.

Morphological and Optical Properties of Different Mg Percentage of ZnO/Mg Thin Films Prepared by Sol-Gel Spin-Coating and Immersion Method

2015 ◽  
Vol 1107 ◽  
pp. 637-642 ◽  
Author(s):  
Aadila Aziz ◽  
R. Mohamed ◽  
A.N. Afaah ◽  
N.A.M. Asib ◽  
M. Rusop ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Immersion Method ◽  
Weight Percentage ◽  
Tauc Plot ◽  
Vis Spectroscopy

We have successfully demonstrated ZnO/Mg thin films on Mg seeded-template by using sol-gel spin-coating and immersion technique. By increasing weight percentage of Mg, zinc particles become agglomerate and displayed flower formed as displayed in FESEM characterization. It was observed that the morphology of the zinc particles on Mg seeded-template change from inconsistently distribution for 1 and 3 % into cluster flower-like of zinc particles for 5 and 7 % weight percentage of Mg. The optical properties of the ZnO/Mg thin films were examined by UV-Vis spectroscopy and the Tauc plot methods was used to estimate the optical band gap. The study reveals that, 7 % weight percentage of Mg was recorded as the highest transmittance which is more than 60 % in visible wavelength compared to others. With the rise weight percentage of Mg, the transmittance of the thin films was increased except for 5 %. This gradually downgraded to below 60 % of transmission most probably due to the grain size that becomes bigger. The optical band gap can be tuned by using different Mg percentage to the ZnO/Mg thin films.

scholarly journals Optimized Scale-Invariant Hog Descriptors for Tobacco Plant Detection

2021 ◽  
Vol 17 ◽  
pp. 787-794
Author(s):  
M. T. Thirthe Gowda ◽  
J. Chandrika
Keyword(s):  
Detection Rate ◽  
Performance Metrics ◽  
Detection System ◽  
Tobacco Plant ◽  
Research Work ◽  
Scale Invariant ◽  
High Detection Rate ◽  
Scale Range ◽  
Computationally Intensive ◽  
The Impact

The histogram of gradient (HOG) descriptor is being employed in this research work to demonstrate the technique of scale variant to identify the plant in surveillance videos. In few scenarios, the discrepancies in the histogram of gradient descriptors along with scale as well as variation in illumination are considered as one of the major hindrances. This research work introduces a unique SIO-HOG descriptor that is approximated to be scale-invariant. With the help of the footage that is captured from the tobacco plant identification process, the system can integrate adoptive bin selections as well as sample resizing. Further, this research work explores the impact of a PCA transform that is based on the process of feature selection on the performance of overall recognition and thereby considering finite scale range, adoptive orientation binning in non-overlapping descriptors, as well as finite scale range are all essential for a high detection rate. The feature vector of HOG over a complete search window is computationally intensive. However, suitable frameworks for classification can be developed by maintaining a precise range of attributes with finite Euclidean distance. Experimental results prove that the proposed approach for detecting tobacco from other weeds has resulted in an improved detection rate. And finally, the robustness of the complete plant detection system was evaluated on a video sequence with different non-linearity's that is quite common in a real-world environment and its performance metrics are evaluated

Enumeration and Identification of Asbestos Fibres in Water

1974 ◽  
Vol 32 ◽  
pp. 526-527 ◽  
Author(s):  
O. Mudroch ◽  
J. R. Kramer
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Drainage Basin ◽  
Lake Superior ◽  
Research Work ◽  
List Type ◽  
The West ◽  
Asbestos Fibre ◽  
Amphibole Asbestos

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

Beam-radiation effects on wool in the ESEM

1986 ◽  
Vol 44 ◽  
pp. 674-675
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Beam ◽  
Radiation Effects ◽  
Research Work ◽  
Beam Radiation ◽  
Liquid Environment ◽  
Know How ◽  
Environmental Sem

The advent of the environmental SEM (ESEM) has made possible the examination of uncoated and untreated specimen surfaces in the presence of a gaseous or liquid environment. However, the question arises as to what degree the examined surface remains unaffected by the action of the electron beam. It is reasonable to assume that the beam invariably affects all specimens but the type and degree of effect may be totally unimportant for one class of applications and totally unacceptable for another; yet, for a third class, it is imperative to know how our observations are modified by the presence of the beam. The aim of this report is to create an awareness of the need to initiate research work in various fields in order to determine the guiding rules of the limitations (or even advantages) due to irradiation.

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