Enhanced peroxidase-like activity of MMT-supported cuprous oxide nanocomposites toward rapid colorimetric estimation of H2 O2

2018 ◽  
Vol 33 (2) ◽  
pp. e4716 ◽  
Author(s):  
Siming Lian ◽  
Linna Gao ◽  
Miaomiao Chen ◽  
Zhenxue Liu ◽  
Jun Qiu ◽  
...  
Keyword(s):  
Cuprous Oxide ◽  
Colorimetric Estimation

Characterization of intergranular cuprous oxide in polycrystalline YBa2Cu3O7-x

1988 ◽  
Vol 46 ◽  
pp. 880-881
Author(s):  
Bradley L. Thiel ◽  
Chan Han R. P. ◽  
Kurosky L. C. Hutter ◽  
I. A. Aksay ◽  
Mehmet Sarikaya
Keyword(s):  
Grain Boundary ◽  
Cuprous Oxide ◽  
Room Temperature ◽  
Boundary Phase ◽  
Spectroscopic Techniques ◽  
Transition Width ◽  
Practical Applications ◽  
Thin Foils ◽  
Superconducting Oxides

The identification of extraneous phases is important in understanding of high Tc superconducting oxides. The spectroscopic techniques commonly used in determining the origin of superconductivity (such as RAMAN, XPS, AES, and EXAFS) are surface-sensitive. Hence a grain boundary phase several nanometers thick could produce irrelevant spectroscopic results and cause erroneous conclusions. The intergranular phases present a major technological consideration for practical applications. In this communication we report the identification of a Cu2O grain boundary phase which forms during the sintering of YBa2Cu3O7-x (1:2:3 compound).Samples are prepared using a mixture of Y2O3. CuO, and BaO2 powders dispersed in ethanol for complete mixing. The pellets pressed at 20,000 psi are heated to 950°C at a rate of 5°C per min, held for 1 hr, and cooled at 1°C per min to room temperature. The samples show a Tc of 91K with a transition width of 2K. In order to prevent damage, a low temperature stage is used in milling to prepare thin foils which are then observed, using a liquid nitrogen holder, in a Philips 430T at 300 kV.

Effects of Reactant Mixing Mode on Dispersibility and Particle Size Stability of Cuprous Oxide Particles

2012 ◽  
Vol 27 (2) ◽  
pp. 195-200
Author(s):  
Yue-Jun WANG ◽  
Kang-Gen ZHOU ◽  
Zhi-Gang JIANG
Keyword(s):  
Particle Size ◽  
Cuprous Oxide ◽  
Size Stability ◽  
Oxide Particles

scholarly journals Graphite Studded with Facile-Synthesized Cu2O Nanoparticle-Based Cubes as a Novel Electrochemical Sensor for Highly Sensitive Voltametric Determination of Mebeverine Hydrochloride

Chemosensors ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 35
Author(s):  
Ahmed H. Naggar ◽  
Ahmed Kotb ◽  
Ahmed A. Gahlan ◽  
Mahmoud H. Mahross ◽  
Abd El-Aziz Y. El-Sayed ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Lower Limit ◽  
Electrochemical Behavior ◽  
Cuprous Oxide ◽  
Density Functional ◽  
Limit Of Detection ◽  
Biological Fluids ◽  
Chemical Reduction ◽  
Anodic Stripping Voltammetry ◽  
Mebeverine Hydrochloride

Herein, a feasible chemical reduction method followed by intensive mixing was applied for the preparation of an attractive material based on graphite studded with cuprous oxide nanoparticle-based cubes (Cu2ONPs–C@G). Transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD) and cyclic voltammetry (CV) were utilized for characterization. Cuprous oxide nanoparticles (Cu2ONPs), with a diameter range mainly distributed from 4 to 20 nm, aggregate to form microcubes (Cu2ONPs–C) with an average diameter of about 367 nm. Paste electrode was prepared using Cu2ONPs–C@G (Cu2ONPs–C@G/PE) for voltametric quantification of the musculotropic antispasmodic drug: mebeverine hydrochloride (MEB). The electrochemical behavior of MEB was studied using CV, and the optimum analytical parameters were investigated using square wave adsorptive anodic stripping voltammetry (SWAdASV). Moreover, density functional theory (DFT) was used to emphasize the ability of MEB to form a complex with Cu2+, confirming the suggested electrochemical behavior of MEB at Cu2ONPs–C@G/PE. With good stability and high reproducibility, SWAdASV of Cu2ONPs–C@G/PE shows successful quantification of MEB over the concentration range of 5.00 × 10−11–1.10 × 10−9 M with lower limit of detection (LOD) and lower limit of quantification (LOQ) values of 2.41 × 10−11 M and 8.05 × 10−11 M, respectively. Finally, accurate quantification of MEB in dosage forms (tablets) and biological fluids (spiked human urine and plasma samples) was achieved using Cu2ONPs-C@G/PE.

scholarly journals THE COLORIMETRIC ESTIMATION OF THE HYDROGEN ION CONCENTRATION OF URINE

1928 ◽  
Vol 78 (1) ◽  
pp. 225-242
Author(s):  
Victor C. Myers ◽  
Edward Muntwyler
Keyword(s):  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Colorimetric Estimation ◽  
Concentration Of Urine

scholarly journals COLORIMETRIC ESTIMATION OF GUANIDINE-LIKE SUBSTANCES IN THE URINE

1937 ◽  
Vol 118 (1) ◽  
pp. 137-145
Author(s):  
Jerome E. Andes ◽  
Victor C. Myers
Keyword(s):  
Colorimetric Estimation

Phytochemical‐Assisted Synthesis of Cuprous Oxide Nanoparticles and Their Antimicrobial Studies

2021 ◽  
Vol 6 (14) ◽  
pp. 3534-3539
Author(s):  
Meenakshi Mannarmannan ◽  
Krishnendu Biswas
Keyword(s):  
Cuprous Oxide ◽  
Oxide Nanoparticles ◽  
Antimicrobial Studies ◽  
Cuprous Oxide Nanoparticles

scholarly journals THE COLORIMETRIC ESTIMATION OF CYSTINE AND GLUTATHIONE

1927 ◽  
Vol 72 (1) ◽  
pp. 177-183
Author(s):  
George Hunter ◽  
Blythe Alfred Eagles
Keyword(s):  
Colorimetric Estimation

scholarly journals AN EXAMINATION OF THE FOLIN-FARMER METHOD FOR THE COLORIMETRIC ESTIMATION OF NITROGEN

1915 ◽  
Vol 20 (1) ◽  
pp. 47-59
Author(s):  
Joseph C. Bock ◽  
Stanley R. Benedict
Keyword(s):  
Colorimetric Estimation

Engineering the surface of cuprous oxide via surface coordination for efficient catalysis on aerobic oxidation of benzylic alcohols under ambient conditions

2021 ◽  
Vol 543 ◽  
pp. 148840
Author(s):  
Yunlian Yang ◽  
Wei Zhong ◽  
Ruonan Ma ◽  
Chunxin Lu ◽  
Zhongquan Shen ◽  
...  
Keyword(s):  
Cuprous Oxide ◽  
Aerobic Oxidation ◽  
Ambient Conditions ◽  
Benzylic Alcohols
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