Eco-Friendly One Step Conversion of P-Nitrophenol into P-Aminophenol Using Calix[4]Arene Derivative Based Functionalized Cuo Nanoparticles: An Excellent Catalytic Agent

2021 ◽  
Author(s):  
Anwar Ali Chandio ◽  
Shahabuddin Memon ◽  
Ayaz Ali Memon ◽  
Aamna Balouch ◽  
Roomia Memon ◽  
...  
Keyword(s):  
Cuo Nanoparticles ◽  
Arene Derivative ◽  
One Step

One-step synthesis of CuO nanoparticles and their effects on H9c2 cardiomyoblasts cells

2020 ◽  
Vol 50 (8) ◽  
pp. 644-653
Author(s):  
Narayanan Jayaprakash ◽  
Ranganathan Suresh ◽  
Subramaniyam Rajalakshmi ◽  
Elumalai Sundaravadivel ◽  
Sundaramoorthy Raja
Keyword(s):  
Cuo Nanoparticles ◽  
One Step ◽  
H9c2 Cardiomyoblasts

Domestic microwave assisted one-step co-precipitation of Ag–CuO nanocomposite of Cu/Ag ratio optimized for photocatalysis and comparison with blending CuO with Ag nanoparticles

2021 ◽  
Vol 99 (4) ◽  
pp. 403-410
Author(s):  
Mahmoud Mohamed Emara ◽  
Shaimaa Khamis Ahmed ◽  
Ali El-Dissouky
Keyword(s):  
Photocatalytic Activity ◽  
Schottky Barrier ◽  
Cuo Nanoparticles ◽  
One Pot ◽  
Cu Content ◽  
Microwave Assisted ◽  
Metal Nitrates ◽  
One Step ◽  
Co Precipitation ◽  
Semiconductor Nanocomposite

The Ag–CuO metal–semiconductor nanocomposite (NC) is an important component in various nanomaterial-based applications. Several approaches have been studied to facilitate its synthesis. However, most of them encounter some drawbacks. In the present work, we show the synthesis of Ag–CuO NCs through one-pot co-precipitation with the aid of simple starting chemicals and measures including metal nitrates, hexamine, agar, and domestic microwave heating. Photocatalyzed degradation of Congo Red in addition to the structural and optical characteristics show that this method is successful in production of the Schottky barrier in Ag–CuO NCs with improved photocatalytic activity (PCA). Changing the Cu content shows that the NC is not successfully formed at low Cu mol%. Consequently, the PCA of Ag–CuO of low Cu (2%–6%) lies within 4.5 × 10−4 – 5.1 × 10−4 min−1, which is even lower than those of plain Ag and CuO nanoparticles (6.0 × 10−4 – 8.1 × 10−4 min−1, respectively). 60 mol% was the optimum Cu content with the highest PCA (18.8 × 10−4 min−1). Blending plain Ag and CuO nanoparticles to mimic the co-precipitated 60 mol% Ag–CuO showed very low PCA, even lower than the plain Ag and CuO, which once again confirms the efficiency of the simple one-pot co-precipitation approach in producing Ag–CuO with the Schottky barrier and promoted PCA.

An Expedient Synthesis of Ketocalix[6]arene Hexamethyl Ether

Synthesis ◽  
2018 ◽  
Vol 50 (19) ◽  
pp. 3897-3901 ◽  
Author(s):  
Silvio Biali ◽  
Norbert Itzhak
Keyword(s):  
Substitution Reaction ◽  
Dimethyl Sulfide ◽  
Nucleophilic Aromatic Substitution ◽  
Water Mixture ◽  
Aromatic Substitution ◽  
Arene Derivative ◽  
X Ray ◽  
X Ray Crystallography ◽  
One Step ◽  
Boron Tribromide

p-tert-Butylcalix[6]arene hexamethyl ether was oxidized in one step to the corresponding ketocalix[6]arene via photochemical bromination (100 W spot lamp) with NBS in a chloroform/water mixture. A pentamethyl ketocalix[6]arene derivative was obtained by reaction of the ketocalix[6]arene hexamethyl ether with boron tribromide dimethyl sulfide complex, and characterized by X-ray crystallography. In the presence of base, the compound undergoes an intramolecular nucleophilic aromatic substitution reaction.

Localised Vibrational Mode in CuO:Sn (5 at%) Nanoparticles

2010 ◽  
Vol 307 ◽  
pp. 37-51 ◽  
Author(s):  
R.N. Mariammal ◽  
K. Ramachandran
Keyword(s):  
Cupric Oxide ◽  
Molecular Model ◽  
Defect Mode ◽  
Waller Factor ◽  
Cuo Nanoparticles ◽  
Defect Modes ◽  
Sn Doping ◽  
Debye Waller Factor ◽  
One Step ◽  
Thermal Vibrations

An experimental and theoretical investigation of defect modes in tin-doped cupric oxide (Sn-doped CuO) nanoparticles synthesized via a one-step solid-state reaction was reported. The defect mode at 455 cm-1due to Sn doping in CuO nanoparticles, calculated using a molecular model, was compared with the experimental value of 458 cm-1obtained from the FTIR vibrational spectrum. The Debye-Waller factor (DWF) of CuO nanoparticles was determined using Rietveld refinement of the XRD pattern and the Wilson’s plot, and the results were discussed on the basis of the number of surface atoms and thermal vibrations. The effect of defect modes upon the DWF of Sn-doped CuO nanoparticles was also discussed.

Preparation and Characterization of Transformer Oil Based Nano Fluids

2019 ◽  
Vol 895 ◽  
pp. 218-223
Author(s):  
N. Kishore ◽  
H.N. Vidyasagar ◽  
D.K. Ramesha
Keyword(s):  
Thermal Conductivity ◽  
Heat Exchangers ◽  
Volume Concentration ◽  
Experimental Studies ◽  
Cuo Nanoparticles ◽  
Transformer Oil ◽  
Preparation Methods ◽  
One Step ◽  
Nano Fluids

This paper is concerned with the preparation and characterization of transformer oil based nanofluids with the suspensions of Al2O3 and CuO nanoparticles . As a part of experimental study the transformer oil based nanofluids for heat exchangers in transformer cooling application, preparation and characterization has been performed. The preparation of nanofluids is the first key step in experimental studies with nanofluids. One step technique and two step technique are generally used for preparing the nanofluids. This work deals with the preparation methods of (Al2O3-Transformer oil ,CuO-Transformer oil) and characterizing the transformer oil based nanofluids of different volume concentrations (0.05%, 0.1%, 0. 5%, 1.0% and 1.5%).From the results it is revealed that increasing the volume concentration resulted in increase in thermal conductivity, viscosity of the nanofluid and decrease in density and specific heat of nanofluid.

An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

1976 ◽  
Vol 34 ◽  
pp. 542-543
Author(s):  
R.P. Goehner ◽  
W.T. Hatfield ◽  
Prakash Rao
Keyword(s):  
Electron Diffraction ◽  
Real Time ◽  
Pattern Analysis ◽  
Flow Diagram ◽  
Hard Copy ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Transmission Electron ◽  
One Step ◽  
Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

Nutrient-regulated gene expression in eukaryotes

2006 ◽  
Vol 73 ◽  
pp. 85-96 ◽  
Author(s):  
Richard J. Reece ◽  
Laila Beynon ◽  
Stacey Holden ◽  
Amanda D. Hughes ◽  
Karine Rébora ◽  
...  
Keyword(s):  
Gene Expression ◽  
Rna Polymerase ◽  
Rna Polymerase Ii ◽  
Transcriptional Control ◽  
Direct Interaction ◽  
Signalling Pathways ◽  
A Cell ◽  
One Step ◽  
Higher Eukaryotes ◽  
Regulated Gene Expression

The recognition of changes in environmental conditions, and the ability to adapt to these changes, is essential for the viability of cells. There are numerous well characterized systems by which the presence or absence of an individual metabolite may be recognized by a cell. However, the recognition of a metabolite is just one step in a process that often results in changes in the expression of whole sets of genes required to respond to that metabolite. In higher eukaryotes, the signalling pathway between metabolite recognition and transcriptional control can be complex. Recent evidence from the relatively simple eukaryote yeast suggests that complex signalling pathways may be circumvented through the direct interaction between individual metabolites and regulators of RNA polymerase II-mediated transcription. Biochemical and structural analyses are beginning to unravel these elegant genetic control elements.

CAD: One Step Forward, One Step Back

2010 ◽  
Vol 43 (18) ◽  
pp. 16
Author(s):  
MATTHEW R.G. TAYLOR
Keyword(s):  
One Step

One-Step Synthesis and Magnetic Phase Transformation of Ln-TM-B Alloy by Chemical Reduction

2007 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
C.W. Kim ◽  
Y.H. Kim ◽  
H.G. Cha ◽  
D.K. Lee ◽  
Y.S. Kang
Keyword(s):  
Phase Transformation ◽  
Magnetic Phase ◽  
Chemical Reduction ◽  
One Step
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