DETERMINATION OF GLYCOL CONTAMINATION IN ENGINE OIL BY INFRARED AND UV-VIS SPECTROSCOPY

2018 ◽  
Author(s):  
Torrey Holland ◽  
Dennis Watson ◽  
P Sivakumar ◽  
Ali Abdul-Munaim ◽  
Robinson Karunanithy
Keyword(s):  
Engine Oil ◽  
Vis Spectroscopy

UV–Vis Spectroscopy Applied in the Determination of the Degradation Time of Abelmoschus esculentus Moench Solution Used as Natural Flocculant

2021 ◽  
Vol 232 (9) ◽  
Author(s):  
Dominique Martins Sala ◽  
Patrícia Valderrama ◽  
Ana Paula Peron ◽  
Flávia Vieira da Silva-Medeiros
Keyword(s):  
Abelmoschus Esculentus ◽  
Vis Spectroscopy ◽  
Degradation Time

scholarly journals Synthesis of silver nanoparticles from extracts of Scytonema geitleri HKAR-12 and their in vitro antibacterial and antitumor potentials

2019 ◽  
Vol 8 (3) ◽  
pp. 576-585
Keyword(s):  
Silver Nanoparticles ◽  
Coli Strain ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
E Coli ◽  
Vis Spectroscopy ◽  
Shape Structure ◽  
Actual Size

In the present study silver nanoparticles (AgNPs) have been synthesized through the cell-free extracts of the rooftop dwelling cyanobacterium Scytonema geitleri HKAR-12. UV-VIS spectroscopy, FTIR, X-ray diffraction, SEM and TEM were used for the determination of morphological, structural and optical properties of synthesized AgNPs. Extracts of Scytonema geitleri HKAR-12 have the ability to reduce AgNO3 to Ag0. Sharp peak at 422 nm indicated the rapid synthesis of AgNPs. FTIR results showed the presence of different groups responsible for the reduction of AgNO3 to AgNPs. XRD pattern confirmed the crystalline nature of AgNPs. SEM showed the bead shape structure of AgNPs. TEM confirmed the actual size of AgNPs to be ranging between 9-17 nm. AgNPs showed antibacterial activity against Pseudomonas aeruginosa, Escherichia coli strain1 and E. coli strain 2 and 11 μg/mL of AgNPs effectively inhibited the growth of MCF-7 cells. Hence, Scytonema geitleri HKAR-12, isolated from the rooftop could serve as a desirable biological candidate for convenient and cheap production of AgNPs having antimicrobial and anti-cancerous properties.

scholarly journals 1,3,4-Thiadiazole-Containing Azo Dyes: Synthesis, Spectroscopic Properties and Molecular Structure

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2822
Author(s):  
Agnieszka Kudelko ◽  
Monika Olesiejuk ◽  
Marcin Luczynski ◽  
Marcin Swiatkowski ◽  
Tomasz Sieranski ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Spectroscopic Properties ◽  
Radiation Absorption ◽  
Functional Theory ◽  
Chemical Structures ◽  
Vis Spectroscopy ◽  
High Yields

Three series of azo dyes derived from 2-amino-5-aryl-1,3,4-thiadiazoles and aniline, N,N-dimethylaniline and phenol were synthesized in high yields by a conventional diazotization-coupling sequence. The chemical structures of the prepared compounds were confirmed by 1H-NMR, 13C-NMR, IR, UV-Vis spectroscopy, mass spectrometry and elemental analysis. In addition, the X-ray single crystal structure of a representative azo dye was presented. For explicit determination of the influence of a substituent on radiation absorption in UV-Vis range, time-dependent density functional theory calculations were performed.

Derivative UV-Vis spectroscopy of asphaltenes solutions for the determination of the composition

2020 ◽  
Vol 38 (8) ◽  
pp. 666-671
Author(s):  
Ernestina Elizabeth Banda-Cruz ◽  
Nohra Violeta Gallardo-Rivas ◽  
Reinaldo David Martínez-Orozco ◽  
Ulises Páramo-García ◽  
Ana María Mendoza-Martínez
Keyword(s):  
Vis Spectroscopy

scholarly journals Determination of engine oil characteristics

2020 ◽  
Vol 776 ◽  
pp. 012099
Author(s):  
K Moricová ◽  
I Papučová ◽  
S Ďurišová ◽  
R Janík
Keyword(s):  
Engine Oil ◽  
Oil Characteristics

scholarly journals Carbon dots as absorbance promoter probes for detection of Cu(ii) ions in aqueous solution: central composite design approach

2018 ◽  
Vol 17 (2) ◽  
pp. 245-255 ◽  
Author(s):  
S. A. R. Shahamirifard ◽  
M. Ghaedi ◽  
M. Montazerozohori ◽  
A. Masoudiasl
Keyword(s):  
Aqueous Solution ◽  
Central Composite Design ◽  
Carbon Dots ◽  
Design Approach ◽  
Complexing Agent ◽  
Vis Spectroscopy ◽  
First Time ◽  
Central Composite ◽  
Determination Of Copper

In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(ii) by UV-vis spectroscopy is reported for the first time.

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