Simultaneous detection and speciation of mono- and di-valent copper ions with a dual-channel fluorescent nanoprobe

2020 ◽  
Vol 56 (97) ◽  
pp. 15337-15340
Author(s):  
An-Qi Zheng ◽  
Chen-Xi Zhao ◽  
Xiao-Juan Wang ◽  
Yang Shu ◽  
Jian-Hua Wang
Keyword(s):  
Copper Nanoparticles ◽  
Copper Ions ◽  
Simultaneous Detection ◽  
Degradation Process ◽  
Fluorescent Nanoprobe ◽  
Dual Channel ◽  
Dynamic Decomposition

A dual channel fluorescent nanoprobe is developed for simultaneous detection and speciation of mono- and di-valent copper ions. It is demonstrated by exploring the dynamic decomposition/degradation process of copper nanoparticles.

scholarly journals Degradation of Toxic Dye Using Phytomediated Copper Nanoparticles and Its Free-Radical Scavenging Potential and Antimicrobial Activity against Environmental Pathogens

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
S. Rajeshkumar ◽  
M. Vanaja ◽  
Arunachalam Kalirajan
Keyword(s):  
Copper Nanoparticles ◽  
Pathogenic Bacteria ◽  
High Efficiency ◽  
Color Change ◽  
Copper Ions ◽  
Dye Degradation ◽  
Radical Scavenging ◽  
Degradation Process ◽  
Methyl Red ◽  
Copper Sulphate Solution

The present investigation deals with the green synthesis of copper nanoparticles in an ecofriendly manner using leaf extract of Andrographis paniculata. Green-synthesized copper nanoparticles were studied for their antibacterial, antioxidant, and catalytic activity. The leaves were powdered and extracted with water and added to copper sulphate solution. The reduction of copper ions to nanoparticles was preliminarily identified by the color change of the reaction mixture. The synthesized nanoparticle was characterized by using a UV-Vis Spectrophotometer at a different wavelength with different time intervals. Functional groups available on the surface of the nanoparticle were identified by Fourier transform infrared spectroscopy (FTIR). Surface roughness was characterized by atomic force microscopy (AFM). X-ray diffraction (XRD) analysis showed six distinct intense peaks indicating the crystalline nature of synthesized copper nanoparticles (CuNPs). A scanning electron microscope (SEM) demonstrated polydispersed nanoparticles formed in the reaction process. The antibacterial activity of the nanoparticles was evaluated by an agar well diffusion assay against pathogenic bacteria. The antioxidant activity showed the excellent reduction of DPPH free radicals by nanoparticles. These results confirmed that copper nanoparticles serve as an alternative therapeutic agent over conventional drugs. Moreover, copper nanoparticles were also used to study the effect on the dye degradation process of methyl red and eosin dyes. Copper nanoparticles effectively remove the dyes with high efficiency up to 92% and 95% of methyl red and eosin dye, respectively.

scholarly journals Antimicrobial Property of Polypropylene Composites and Functionalized Copper Nanoparticles

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1694
Author(s):  
Noemi Jardón-Maximino ◽  
Gregorio Cadenas-Pliego ◽  
Carlos A. Ávila-Orta ◽  
Víctor Eduardo Comparán-Padilla ◽  
Luis E. Lugo-Uribe ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Crystallization Process ◽  
Copper Ions ◽  
Antimicrobial Property ◽  
Aminobutyric Acid ◽  
New Materials ◽  
Melt Mixing ◽  
Polypropylene Composites ◽  
And Staphylococcus Aureus ◽  
Thermal Stability Of

Copper nanoparticles (CuNPs) functionalized with polyethyleneimine (PEI) and 4-aminobutyric acid (GABA) were used to obtain composites with isotactic polypropylene (iPP). The iPP/CuNPs composites were prepared at copper concentrations of 0.25–5.0 wt % by melt mixing, no evidence of oxidation of the CuNP was observed. Furthermore, the release of copper ions from iPP/CuNPs composites in an aqueous medium was studied. The release of cupric ions was higher in the composites with 2.5 and 5.0 wt %. These composites showed excellent antibacterial activity (AA) toward Pseudomona aeruginosa (P. aeruginosa) and Staphylococcus aureus (S. aureus). The incorporation of CuNP into the iPP polymeric matrix slightly decreased the thermal stability of the composite material but improved the crystallinity and the storage modulus. This evidence suggests that CuNPs could work as nucleating agents in the iPP crystallization process. The iPP/CuNPs composites presented better AA properties compared to similar composites reported previously. This behavior indicates that the new materials have great potential to be used in various applications that can be explored in the future.

An improved deep convolution neural network for predicting the remaining useful life of rolling bearings

2020 ◽  
pp. 1-9
Author(s):  
Yiming Guo ◽  
Hui Zhang ◽  
Zhijie Xia ◽  
Chang Dong ◽  
Zhisheng Zhang ◽  
...  
Keyword(s):  
Neural Network ◽  
Degradation Process ◽  
Rolling Bearing ◽  
Remaining Useful Life ◽  
Convolution Neural Network ◽  
Dual Channel ◽  
Time Domain Data ◽  
Channel Input ◽  
Deep Convolution Neural Network ◽  
Useful Life

The rolling bearing is the crucial component in the rotating machinery. The degradation process monitoring and remaining useful life prediction of the bearing are necessary for the condition-based maintenance. The commonly used deep learning methods use the raw or processed time domain data as the input. However, the feature extracted by these approaches is insufficient and incomprehensive. To tackle this problem, this paper proposed an improved Deep Convolution Neural Network with the dual-channel input from the time and frequency domain in parallel. The proposed methodology consists of two stages: the incipient failure identification and the degradation process fitting. To verify the effectiveness of the method, the IEEE PHM 2012 dataset is adopted to compare the proposed method and other commonly used approaches. The results show that the improved Deep Convolution Neural Network can effectively describe the degradation process for the rolling bearing.

Dual-channel ITO-microfluidic electrochemical immunosensor for simultaneous detection of two mycotoxins

Talanta ◽  
2019 ◽  
Vol 194 ◽  
pp. 709-716 ◽  
Author(s):  
Lin Lu ◽  
Sundaram Gunasekaran
Keyword(s):  
Simultaneous Detection ◽  
Electrochemical Immunosensor ◽  
Dual Channel

Efficient monitoring of dosimetric behaviour for copper nanoparticles through studying its optical properties

2019 ◽  
Vol 107 (6) ◽  
pp. 523-529 ◽  
Author(s):  
Mohamad Bekhit ◽  
Asmaa Sobhy ◽  
Zakaria I. Ali ◽  
Sameh M. Gafar
Keyword(s):  
Copper Nanoparticles ◽  
Metal Ion ◽  
Copper Ions ◽  
Dose Range ◽  
Ion Concentration ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
High Dose ◽  
Γ Irradiation ◽  
Γ Radiation

Abstract A novel high-dose dosimeter based on γ radiation reduction of copper ions and formation of copper metal inside polymer matrix were investigated. γ radiation induced synthesis of copper nanoparticles (CuNPs) in poly vinyl alcohol films were studied by UV-Visible Spectrophotometer, X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The optical absorption spectra showed that the Cu/PVA nanocomposite films have surface plasmon resonance (SPR) of copper nanoparticles which depending on irradiation doses. Upon γ irradiation these films turns its color from faint blue to deep reddish brown depending on metal ion concentration. The XRD pattern and FTIR spectrum confirm the formation of the CuNPs. The response of Cu/PVA nanocomposite dosimeters depends on both the irradiation doses and concentration of copper precursor. The dose range for these films was from 50 to 650 kGy, revealing its important applications for high dose dosimetry. Cu/PVA nanocomposites films exhibit good post-irradiation stability in dark and light.

A naked-eye chemosensor for simultaneous detection of iron and copper ions and its copper complex for colorimetric/fluorescent sensing of cyanide

2016 ◽  
Vol 229 ◽  
pp. 257-271 ◽  
Author(s):  
Gyeong Jin Park ◽  
Ga Rim You ◽  
Ye Won Choi ◽  
Cheal Kim
Keyword(s):  
Copper Complex ◽  
Copper Ions ◽  
Simultaneous Detection ◽  
Fluorescent Sensing ◽  
Naked Eye

scholarly journals Cytidine-stabilized copper nanoclusters as a fluorescent probe for sensing of copper ions and hemin

RSC Advances ◽  
2018 ◽  
Vol 8 (17) ◽  
pp. 9057-9062 ◽  
Author(s):  
Yong Wang ◽  
Tianxia Chen ◽  
Zhengtao Zhang ◽  
Yongnian Ni
Keyword(s):  
Fluorescent Probe ◽  
Copper Ions ◽  
Simultaneous Detection ◽  
Inner Filter Effect ◽  
Copper Nanoclusters ◽  
Turn On ◽  
Filter Effect ◽  
Fluorescence Turn On

A sensitive and selective fluorescence “turn on–off” strategy for simultaneous detection of Cu2+and hemin was proposed on the basis of the formation of fluorescent CuNCs and the inner filter effect of hemin on the fluorescence of the CuNCs.

Simultaneous sensitive analysis of Cd(ii), Pb(ii) and As(iii) using a dual-channel anodic stripping voltammetry approach

2020 ◽  
Vol 44 (15) ◽  
pp. 5739-5745
Author(s):  
Lijuan Bu ◽  
Qingji Xie ◽  
Hai Ming
Keyword(s):  
Heavy Metals ◽  
Anodic Stripping Voltammetry ◽  
Simultaneous Detection ◽  
High Sensitivity ◽  
Stripping Voltammetry ◽  
Sensitive Analysis ◽  
Trace Heavy Metals ◽  
Dual Channel ◽  
Anodic Stripping

A dual-channel anodic stripping voltammetry protocol is proposed for the simultaneous detection of trace heavy metals in one experiment with high sensitivity.

scholarly journals Synthesis of Nanocrystalline Cellulose Stabilized Copper Nanoparticles

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Aminu Musa ◽  
Mansor B. Ahmad ◽  
Mohd Zobir Hussein ◽  
Saiman Mohd Izham ◽  
Kamyar Shameli ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Copper Nanoparticles ◽  
Metal Ion ◽  
Copper Ions ◽  
Chemical Reduction ◽  
Average Particle Size ◽  
Nanocrystalline Cellulose ◽  
Average Particle ◽  
Face Centered Cubic ◽  
X Ray

A chemical reduction method was employed for the synthesis of copper nanoparticles stabilized by nanocrystalline cellulose (NCC) using different concentrations of copper salt in aqueous solution under atmospheric air. CuSO4·5H2O salt and hydrazine were used as metal ion precursor and reducing agent, respectively. Ascorbic acid and aqueous NaOH were also used as an antioxidant and a pH moderator, respectively. The number of CuNPs increased with increasing concentration of the precursor salt. The formation of copper nanoparticles stabilized by NCC (CuNPs@NCC) was investigated by UV-visible spectroscopy (UV-vis), where the surface absorption maximum was observed at 590 nm. X-ray diffraction (XRD) analysis showed that the CuNPs@NCC are of a face-centered cubic structure. Moreover, the morphology of the CuNPs@NCC was investigated using transmission electron microscope (TEM) and field emission scanning electron microscope (FESEM), which showed well-dispersed CuNPs with an average particle size less than 4 nm and the shape of CuNPs was found to be spherical. Energy dispersive X-ray spectroscope (EDS) also confirmed the presence of CuNPs on the NCC. The results demonstrate that the stability of CuNPs decreases with an increasing concentration of the copper ions.

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