Preparation and Properties of Mattel Oxide Nanoparticles by Pulse Laser Ablation in Liquid as Photo-Catalysis

2021 ◽  
Vol 900 ◽  
pp. 197-204
Author(s):  
Abeer A. Saleh ◽  
Adawiya J. Haider ◽  
Alaa Nazar
Keyword(s):  
Room Temperature ◽  
Silver Oxide ◽  
Pulse Laser Ablation ◽  
Visible Spectroscopy ◽  
Laser Ablation In Liquid ◽  
Preparation Conditions ◽  
Photo Catalysis ◽  
Ablation Laser ◽  
Uv Visible ◽  
Zinc Nickel

Zinc, nickel and silver oxide were prepared by the method of pulsed ablation laser in liquid, with different preparation conditions, where the number of pulses was changed (25, 50 and 75) and the frequency was 1 Hz and the energy was 600 mJ and at room temperature. We have used UV-visible spectroscopy, field emission scanning electron microscopy (FSEM), the EDX system, then these materials were added to the local dye and the photo-catalytic activity was applied to them using a UV-500 lamp for different periods of time (0, 30, 60 and 120 mint) and they acted as photo-catalysts.

Synthesis and Characterization of Gold Nanoparticles Synthesized in Gel and Paper by Electrolysis

2019 ◽  
Vol 824 ◽  
pp. 163-167
Author(s):  
Pema Dechen ◽  
Ekasith Somsook
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gold Nanoparticles ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Gold Leaf ◽  
Uv Visible ◽  
Scanning Electron

In this report, synthesis and characterization of gold nanoparticles (AuNPs) from gold leaf by electrolysis in two different media (gel and paper) in presence of sodium chloride (NaCl), glucose (C6H12O6) and polyvinyl pyrrolidone (PVP) at room temperature were investigated. Graphite was used as two electrodes, NaCl was used as an electrolyte, C6H12O6 was used as reducing agent and PVP was used as stabilizer to control the aggregation of the nanoparticles. UV-Visible spectroscopy (UV-Vis) and scanning electron microscopy (SEM) were used to confirm the characteristics and morphologies of the synthesized AuNPs.

scholarly journals Mild and Efficient Tunable Brønsted Acidic Ionic Liquid Catalyzed O-Acetylation and O-Trimethylsilylation with Trimethylsilyl Acetate (TMSOAc) and Hexamethyldisilazane (HMDS)

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 825
Author(s):  
Amit Ravindra Pantawane ◽  
Mayur Thul ◽  
Yi-Jyun Lin ◽  
Michelle Lin ◽  
Wesley Lin ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Visible Spectroscopy ◽  
Acidic Ionic Liquid ◽  
Post Process ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Uv Visible ◽  
Work Up

This report discloses a mild and efficient O-acetylation using easily accessible TMSOAc as a novel acetyl reagent and O-trimethylsilylation using HMDS for various alcohols catalyzed by tunable Brønsted acidic ionic liquids (TBAILs). Imidazolium-based TBAILs were prepared by a two-step atom-economic reaction and acidities measured by using UV-visible spectroscopy. Both protections for alcohols were accomplished at room temperature with good to excellent yields, while the products and TBAILs were separated by simple work-up for O-silylation and column chromatography for O-acetylation. Notably, with the simple post-process, TBAILs catalyst in this solvent free method easily recovered and recycled several times without significant degradation.

Preparation of Green Nanosilver by Ascorbic Acid and its Spectral Properties

2013 ◽  
Vol 749 ◽  
pp. 503-506
Author(s):  
Yang He Luo ◽  
Chun Ming Wang ◽  
Wen Qing Yin ◽  
Ai Hui Liang
Keyword(s):  
Ascorbic Acid ◽  
Spectral Properties ◽  
Room Temperature ◽  
Rayleigh Scattering ◽  
Resonance Rayleigh Scattering ◽  
Visible Spectroscopy ◽  
Laser Scattering ◽  
Transmission Electron ◽  
Uv Visible ◽  
Strong Absorption Peak

In the presence of stabilizer of citrate and room temperature, stable green nanosilver sol was prepared by reduction of AgNO3by ascorbic acid. It was characterized by UV-visible spectroscopy, resonance Rayleigh scattering (RRS) spectroscopy, laser scattering and transmission electron microscopy. Results showed that the nanosilver sol exhibited a RRS peak at 496 nm, a strong absorption peak at 414 nm and the particle size is 12 nm.

scholarly journals Analysis and characterisation of anthocyanins in mulberry fruit

2010 ◽  
Vol 28 (No. 2) ◽  
pp. 117-126 ◽  
Author(s):  
C. Qin ◽  
Y. Li ◽  
W. Niu ◽  
Y. Ding ◽  
R. Zhang ◽  
...  
Keyword(s):  
Food Processing ◽  
Room Temperature ◽  
Morus Alba ◽  
Visible Spectroscopy ◽  
Fruit Extract ◽  
Mulberry Fruit ◽  
Medicinal Food ◽  
Uv Visible ◽  
Mulberry Fruits

The fruit of mulberry (<I>Morus alba</I> L., Moraceae) has been used as medicinal food in China for a long history. The pigment from the fruit extract is a kind of natural colourant for food processing and has potential medical and commercial values. This study focuses on the analysis and characterisation of anthocyanins from mulberry pigment. The fresh mulberry fruits were extracted with the solvent of 95% alcohol/0.1% HC l (1:1, ratio) at room temperature for 4 h in the dark. After the isolation using C-18 column, the pigment was identified with UV-Visible Spectroscopy, HPLC-PAD, LC-MS, and <SUP>1</SUP>HNMR. The results showed that the abundant anthocyanins in mulberry pigment are cyanidin 3-<I>O</I>-rutinoside (60%) and cyanidin 3-<I>O</I>-glucoside (38%). The minor anthocyanins (totally 2%) are pelargonidin 3-<I>O</I>-glucoside and pelargonidin 3-<I>O</I>-rutinoside.

Low-temperature kinetic measurements of microsecond freeze–hyperquench (MHQ) cytochrome oxidase monitored by UV–visible spectroscopy with a newly designed cuvette

2006 ◽  
Vol 34 (1) ◽  
pp. 136-138 ◽  
Author(s):  
F.G.M. Wiertz ◽  
S. de Vries
Keyword(s):  
Low Temperature ◽  
Cytochrome Oxidase ◽  
Cytochrome C Oxidase ◽  
Room Temperature ◽  
Paracoccus Denitrificans ◽  
Visible Spectroscopy ◽  
Kinetic Measurements ◽  
Intermediate States ◽  
Powder Samples ◽  
Uv Visible

A special cuvette was designed to measure optical changes of MHQ (microsecond freeze–hyperquench) powder samples [Wiertz, Richter, Cherepanov, MacMillan, Ludwig and de Vries (2004) FEBS Lett. 575, 127–130] at temperatures below approx. 250 K. Reduced cytochrome c oxidase from Paracoccus denitrificans was reacted with O2 for 100 μs, frozen as a powder and transferred to the cuvette. Subsequently, cytochrome oxidase was allowed to react further following stepwise increments of the temperature from 100 K up to 250 K while recording spectra between 300 and 700 nm. The temperature was raised only when no further changes in the spectra could be detected. The experiment yielded spectra of the A, PM, F and O intermediate states. This demonstrated that the catalytic cycle of cytochrome oxidase at low temperature is similar to that at room temperature and so verifies the suitability of this method for the study of enzymes with high catalytic-centre activity.

scholarly journals Congo Red and Nigrosine Dye Degradation using Dimethyl Dioxirane as an Oxidising Agent

2021 ◽  
Vol 37 (5) ◽  
pp. 1221-1228
Author(s):  
S. Vinotha ◽  
A.Leema Rose
Keyword(s):  
Congo Red ◽  
Room Temperature ◽  
Functional Group ◽  
Dye Degradation ◽  
Visible Spectroscopy ◽  
Before And After ◽  
Ft Ir ◽  
Combined Action ◽  
Uv Visible ◽  
Ft Ir Spectroscopy

The advanced oxidation of Congo red (CR) and Nigrosine (NI) using the combined action of dimethyl dioxirane as an oxidising agent is described in this study. The effects of several parameters, such as the concentration of the oxidising agent, the initial dye concentration, and the pH, have been investigated. At room temperature, the oxidising agent dimethyl dioxirane was employed to test the degradation of CR and NI dyes. On the degradation efficiency of CR and NI, pH’s effects, oxidising agent, and initial dye concentration were examined. The absorbance of CR and NI dyes before and after degradation was measured using UV-visible spectroscopy. The functional group existing in the dyes before and after degradation was determined using FT-IR spectroscopy.

scholarly journals Synthesis, characterization, electrochemical studies and X-ray structures of mixed-ligand polypyridyl copper(II) complexes with the acetate

2016 ◽  
Vol 81 (11) ◽  
pp. 1251-1262 ◽  
Author(s):  
Oluwafunmilayo Adekunle ◽  
Ray Butcher ◽  
Oladapo Bakare ◽  
Olusegun Odunola
Keyword(s):  
Room Temperature ◽  
Magnetic Measurements ◽  
Magnetic Moments ◽  
Copper Ion ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Elemental Analyses ◽  
Structural Details ◽  
Uv Visible

[Cu(phen)2(CH3COO)](ClO4).2H2O (1) and [Cu(bipy)2(CH3COO)]-(ClO4).H2O (2) {phen = 1,10-phenanthroline, bipy = 2,2?-bipyridine}were synthesized and characterized. The complexes were characterized by employying elemental analyses, infrared and UV-Visible spectroscopy, room temperature magnetic measurements and the crystal structures elucidated using X-ray diffraction experiment. The redox properties of the complexes were also investigated. Both structures have a square pyramidal CuN4O chromophore which exhibit significant distortions due to long Cu-O [2.217(3) ? for (1) and 2.179 (1) for (2)] and Cu-N [2.631(2) ? for (1) and 2.714(1) ? for (2)] bonds. This distortion if further shown by the O-Cu-N bond angles [147.71(8) o for (1) and 153.40(5) o for (2)]. The elemental analyses further support the structural details unveiled by the single crystal X-ray diffraction analysis. The infrared spectra shows the acetate vibrational frequencies at 1587 cm-1,1428 cm-1, 1314 cm-1 for (1) and 1571 cm-1, 1441 cm-1, 1319c m-1 for (2) and the perchlo-rate bands at 1059 cm-1, 720 cm-1 (1) and 1080 cm-1,768 cm-1 (2). The broad d-d bands for the copper ion at 14,514 cm-1(1) and 14,535 cm-1(2) support the adoption of square pyramid geometries. The magnetic moments for the two complexes are 1.83 B.M for (1) and 1.72 B.M for (2). The peak to peak values of the two complexes show that the electrode reactions are quasi-reversibile with ?Ep = 0.023V (1) and 0.025V for (2). In both structures, there are ?-? intermolecular interactions in addition to hydrogen bonding between the units.

Morphology and Luminescence of ZnS Quantum Dots Encapsulated in UV-Curable Sealant

2013 ◽  
Vol 538 ◽  
pp. 254-257 ◽  
Author(s):  
Qing Lan Ma ◽  
Rui Xiong ◽  
Yuan Ming Huang
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Room Temperature ◽  
Green Emission ◽  
Sem Analysis ◽  
Optical Absorption Spectra ◽  
Visible Spectroscopy ◽  
Uv Curable ◽  
Uv Visible ◽  
Scanning Electron

Zinc sulfide (ZnS) quantum dots (QDs) were encapsulated in ultraviolet (UV)-curable sealant upon the UV irradiation of the 365 nm. The QDs-sealant films were characterized with scanning electron microscopy (SEM), UV-visible spectroscopy and photoluminescence (PL) spectroscopy. Based on SEM analysis, the QDs encapsulated in UV-cured sealant clearly exhibited the formation of different size aggregates with a strong chemical bondage between the QDs and sealant. Optical absorption spectra showed strong red-shift for the QDs encapsulated in the UV sealant due to the aggregates of the QD nanoparticles. Room-temperature PL spectra have demonstrated that the pure QDs showed green emission at 517 nm while QDs-sealant film gave off cyan-blue PL with a strong and broad peak at 485 nm. Our results have demonstrated that the PL efficiency of QDs encapsulated in UV sealant matrix is higher than that of the QDs or UV sealant due to passivation of surfaces.

scholarly journals Coaxially Aligned Polyaniline Nanofibers Doped with 3-Thiopheneacetic Acid through Interfacial Polymerization

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Lixia Zhang ◽  
Geoffrey I. N. Waterhouse ◽  
Lijuan Zhang
Keyword(s):  
Redox Potential ◽  
Room Temperature ◽  
Interfacial Polymerization ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Visible Spectroscopy ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Chloride Hexahydrate ◽  
Uv Visible

Coaxially aligned polyaniline (PANI) nanofibers doped with 3-thiopheneacetic acid (TAA) were chemically synthesized by the interfacial polymerization of aniline in the presence of TAA, using iron (III) chloride hexahydrate (FeCl3·6H2O) as the oxidant. The morphology, crystallinity, room temperature conductivity, and coaxial alignment of the PANI-TAA nanofibers were highly dependent on the organic solvent used for the interfacial polymerization, the oxidant, and also the molar ratio of the aniline to TAA. Hexane, diethyl ether, dichloromethane, chloroform, and acetone were used as the organic solvents, and chloroform proved to be the best solvent for the formation of PANI-TAA nanofibers. The redox potential of the oxidant is the key to controlling the morphology and diameter of the PANI-TAA nanofibers. The use of FeCl3as the oxidant leads to the formation of thin (∼50 nm) PANI-TAA nanofibers, which increased in length, crystallinity, conductivity, and coaxial alignment as the molar ratio of TAA to aniline was increased from 0.1 : 1 to 1 : 1. By comparison, only granular PANI was obtained when ammonium persulfate (APS), which has a higher redox potential, was used as the oxidant. The doping function of TAA in the PANI-TAA nanofibers was confirmed by means of FTIR and UV-Visible spectroscopy.

SYNTHESIS OF TiO2 NANORIBBONS AND ITS APPLICATION IN PHOTOELECTROCHEMICAL WATER SPLITTING FOR HYDROGEN PRODUCTION

2011 ◽  
Vol 10 (04n05) ◽  
pp. 723-726 ◽  
Author(s):  
P. K. DUBEY ◽  
R. S. TIWARI ◽  
O. N. SRIVASTAVA ◽  
A. S. K. SINHA
Keyword(s):  
Hydrogen Production ◽  
Room Temperature ◽  
Ph Value ◽  
Hydrothermal Process ◽  
Distilled Water ◽  
Visible Spectroscopy ◽  
Photoelectrochemical Solar Cells ◽  
Uv Visible ◽  
Average Size ◽  
Photoelectrochemical Hydrogen Production

In the present investigation nanoribbons of TiO2 were prepared through the hydrothermal process. In a typical preparation procedure, 2 g of TiO2 powder (average size 100 μm) was added to 50 mL of 10 M NaOH and stirred for 10 min in a beaker. The mixture was then transferred into a teflon lined stainless steel autoclave and heated to 150°C for 48 h. After the autoclave was naturally cooled to room temperature, the obtained sample was filtered and washed several times with distilled water and 0.1 M HCl until the pH value of the solution reached to 7 and then the sample was filtered and dried at 80°C for 8 h. To improve the crystallinity the as dried sample was annealed at 500°C for 4 h. The TiO2 nanoribbons were characterized by SEM, TEM, XRD and UV-Visible spectroscopy. The TiO2 nanoribbons have been used for photoelectrochemical hydrogen production in photoelectrochemical solar cells.

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