scholarly journals Green Synthesis and Characterization of Copper Nanoparticles Using Fortunella margarita Leaves

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4364
Author(s):  
Rutaba Amjad ◽  
Bismillah Mubeen ◽  
Syed Shahbaz Ali ◽  
Syed Sarim Imam ◽  
Sultan Alshehri ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Color Change ◽  
Metal Oxide Nanoparticles ◽  
Visual Observation ◽  
X Ray Diffraction ◽  
Synthesis Of Nanoparticles ◽  
Characteristic Absorption Peak ◽  
Bluish Green ◽  
Dark Green

The use of biomaterials in the synthesis of nanoparticles is one of the most up-to-date focuses in modern nanotechnologies and nanosciences. More and more research on green methods of producing metal oxide nanoparticles (NP) is taking place, with the goal to overcome the possible dangers of toxic chemicals for a safe and innocuous environment. In this study, we synthesized copper nanoparticles (CuNPs) using Fortunella margarita leaves’ extract, which reflects its novelty in the field of nanosciences. The visual observation of a color change from dark green to bluish green clearly shows the instant and spontaneous formation of CuNPs when the phytochemicals of F. margarita come in contact with Cu+2 ions. The synthesis of CuNPs was carried out at different conditions, including pH, temperature, concentration ratio and time, and were characterized with UV-Vis absorption spectra, scanning electron microscope (SEM) and X-ray diffraction (XRD). The UV-Vis analysis reveals the surface plasmon resonance property (SPR) of CuNPs, showing a characteristic absorption peak at 679 nm, while SEM reveals the spherical but agglomerated shape of CuNPs of the size within the range of 51.26–56.66 nm.

scholarly journals Effect of Various Parameters on Bio-Synthesis of Copper Nanoparticles Using Citrus Medica Linn (Lemon) Extract and Its Antibacterial Activity

2020 ◽  
Vol 1 (1) ◽  
pp. 51-58
Author(s):  
Sharmila Pradhan ◽  
Rajeswori Shrestha ◽  
Khuma Bhandari
Keyword(s):  
Antibacterial Activity ◽  
Copper Nanoparticles ◽  
Color Change ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Crystalline Nature ◽  
Bio Synthesis

This research is focused on bio-synthesis of Copper nanoparticles (CuNPs) using lemon extract to study the effect of various parameters on synthesis and to explore antibacterial activity. The biomolecules present in lemon extract act as self reducing and stabilizing agent. The synthesis of CuNPs was found to be affected by various parameters like volume of the lemon extract, concentration of the precursor and the temperature etc. Preliminary characterization of formation of nanoparticles were done by color change and UV-visible (UV-vis) spectroscopy. Elemental composition of the prepared sample was determined via Energy Dispersive X-ray (EDX) Spectroscopy. Presence of important functional groups associated with biomolecules is well characterized by Fourier Transform Infrared spectroscopy (FTIR). Scanning Electron Microscopy (SEM ) revealed the formation agglomerated CuNPs of different shape and sizes and the X-ray diffraction pattern showed the formation of purely crystalline nature of CuNPs. Finally, agar well diffusion method showed that CuNPs have potential antibacterial activity against Gram-ve bacteria compared to Gram +ve bacteria.

Synthesis and characterization of triphenylamine-based polymers and their application towards solid-state electrochromic cells

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78984-78993 ◽  
Author(s):  
Jaemyeng Jeong ◽  
Rangaraju Satish Kumar ◽  
Mergu Naveen ◽  
Young-A. Son
Keyword(s):  
Solid State ◽  
Color Change ◽  
Synthesis And Characterization ◽  
Light Blue ◽  
Light Yellow ◽  
Bluish Green ◽  
Dark Green

Triphenyl amine based new molecules have synthesized for electrochromic cells. We achieved color change forPJK1, orange to dark green; forPJK2, light yellow to reddish brown; forPJK3, light blue to grey; and forPJK4, green to bluish green.

scholarly journals Síntese, caracterização e estabilidade de nanopartículas de magnetita

2021 ◽  
Vol 3 (4) ◽  
pp. 2738-2749
Author(s):  
Monise Cristina Ribeiro Casanova Coltro ◽  
Warde Antonieta da Fonseca-Zang ◽  
Joachim Werner Zang ◽  
Danilo César Silva e Sousa
Keyword(s):  
New Technology ◽  
X Ray Diffraction ◽  
Synthesis Of Nanoparticles ◽  
Research Areas ◽  
Magnetite Fe3o4 ◽  
Mineral Substance ◽  
Abundant Element ◽  
The Stability ◽  
Average Size

Nanopartículas de ferro são muito utilizadas em diversas áreas de pesquisa. O elemento químico ferro (Fe), sendo o quarto elemento mais abundante na crosta terrestre, e a substância mineral magnetita, com propriedade magnética, apresentam aplicações nas áreas industrial, ambiental, biomédica e de novas tecnologias. Este trabalho apresenta processo de síntese de nanopartículas partindo-se de sais precursores, bem como a caracterização dos produtos e as rotas para estabilizá-los. Os sais químicos precursores utilizados foram o cloreto férrico (FeCl3) e o sulfato ferroso (FeSO4) na proporção de 2:1, sob agitação por ultrassom e pH ácido. Para formação do precipitado de nanopartículas usou-se solução aquosa de hidróxido de sódio (NaOH) de pH 12. A difratometria de raio-X, mostra a presença de magnetita (Fe3O4) indicada pelos picos característicos de difração em graus 2Ө = 18° (largo), 31° (fino), 36° (bem definido), 43,4°, 45°, 53,6°, 57,7°, 63,3°. A microscopia eletrônica de transmissão mostra a morfologia dos produtos da síntese. Fatores que influenciam a estabilidade das partículas são agitação, o ajuste de pH, condições de secagem. O tamanho médio das nanopartículas de magnetitas é de aproximadamente 15 nm.   Iron nanoparticles are widely used in several research areas. The chemical element iron (Fe), being the fourth most abundant element in the earth's crust, and the mineral substance magnetite, with magnetic properties, have applications in industrial, environmental, biomedical, and new technology areas. This work presents the process of synthesis of nanoparticles starting from precursor salts, as well as the characterization of the products and the routes to stabilize them. The precursor chemical salts were ferric chloride (FeCl3) and ferrous sulfate (FeSO4) in a 2:1 ratio, under ultrasound agitation and acidic pH. For the nanoparticles growth was applied aqueous solution of sodium hydroxide (NaOH) at pH 12. X-ray diffraction shows the presence of magnetite (Fe3O4) indicated by characteristic diffraction peaks in degrees 2Ө = 18° (wide), 31° (fine), 36° (well defined), 43.4°, 45°, 53.6°, 57.7°, 63.3°. Scanning electron microscopy shows the morphology of the synthesis products. Factors that influence the stability of the particles are agitation, the pH adjustment, and the conditions of drying. The average size of the magnetite nanoparticles is approximately 15 nm.

Arc Discharge Synthesis of Oxides and Carbides of Tungsten and Aluminum

2013 ◽  
Vol 8 (2) ◽  
pp. 95-101
Author(s):  
Alexey Zaikovsky ◽  
Aleksandr Fedoseev ◽  
Salavat Sakhapov ◽  
Anton Evtushenko ◽  
Marina Serebriakova ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Experimental Investigations ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Synthesized Materials ◽  
Discharge Method

Experimental investigations of the possibility of arc discharge method for synthesis of nanoparticles of oxides and carbides of tungsten and aluminum have been presented. The method is based on anode atomization of composed graphite – aluminum and graphite – WO3 electrodes. The transmitted electron microscopy, thermal gravimetric analysis and X-ray diffraction were applied for the characterization of morphology and properties of synthesized materials. It was experimentally shown the arc discharge method allows to syntheses the nanoparticles of oxides and carbides of tungsten and aluminum

Preparation and characterization of azaindolyl-azaindole and structure of its halogen-free dicationic cluster containing the µ4-oxotetracopper(II) core

1994 ◽  
Vol 72 (11) ◽  
pp. 2339-2347 ◽  
Author(s):  
Jacques Poitras ◽  
André L. Beauchamp
Keyword(s):  
Chloride Ions ◽  
X Ray Diffraction ◽  
Solid Mixture ◽  
H Nmr ◽  
Disordered Lattice ◽  
Square Planar ◽  
Nitrogen Donor ◽  
Dark Green ◽  
Halogen Free

Refluxing NbCl5 and excess 7-azaindole (Haza) in benzene yielded a solid mixture containing NbCl5(Haza), NbCl4(Haza)2, the azaindolium ion (H2aza)+, and the azaindolyl-azaindolium ion (H2aza-aza)+. The neutral (Haza-aza) molecule was obtained from the hydrolysed mixture and shown by X-ray diffraction (monoclinic, P21/c, a = 10.025, b = 13.758, c = 8.416 Å, β = 102.89°, Z = 4, R = 0.035) to result from the coupling of two azaindole units via N7—C6′. This compound was the only oxidation product detected, but concurrent formation of other niobium- and (or) azaindole-containing products keeps the yield of Haza-aza low. Dark green crystals of [Cu4O(aza-aza)4]Cl2•6.5H2O were obtained from (Haza-aza) and CuCl2 in wet methanol. The crystal structure (monoclinic, C2/c, a = 17.704, b = 25.240, c = 14.457 Å, β = 116.14°, Z = 4, R = 0.051) shows the presence of a tetranuclear dicationic cluster consisting of a µ4-oxide ion surrounded by a tetrahedron of Cu(II) atoms. A distorted square-planar coordination is achieved about each copper atom by (aza-aza)− ligands each bridging two copper atoms and providing a third nitrogen donor to one of them. For each such cation, the unit cell also includes two chloride ions and 6.5 disordered lattice water molecules. The 1H NMR and infrared spectroscopy data are discussed.

scholarly journals Synthesis and Characterization of Nickel Oxide Nanostructures for Electrochemical Analysis of Methotrexate

2021 ◽  
Vol 22 (2) ◽  
pp. 273-279
Author(s):  
Saeed Ahmed Lakho ◽  
Mansoor Ahmed ◽  
Muhammad Waseem Akhtar ◽  
Madan Lal ◽  
Ubed-Ur-Rahman Mughal ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Supporting Electrolyte ◽  
Metal Oxide Nanoparticles ◽  
Electrochemical Analysis ◽  
X Ray Diffraction ◽  
Oxide Nanostructures ◽  
Interference Studies

Metal oxide nanoparticles have found numerous applications in different fields. In this paper, the preparation of nickel oxide nanostructures is given. The nanostructures were synthesized by using the hydrothermal method. The characterization was done with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The newly synthesized nanostructures were utilized as a modifier of the working electrode, i.e., glassy carbon electrode (GCE). The modified GCE exhibited an excellent response towards methotrexate (MTX) anticancer drug. The modified GCE, as compared to bare GCE, showed an increased response towards MTX. In this study, BrittonRobinson buffer (BRB) was selected as a supporting electrolyte having pH 5. By using electrochemical impedance spectroscopy (EIS), the method was found linear in the range of 5-40 µM with a limit of detection and quantification values of 2.4 µM and 7.28 µM, respectively. The method developed by this way was successfully applied for the analysis of MTX from injection formulations. The interference studies were also carried out to check the method's selectivity.

scholarly journals Synthesis and Characterization of Black Currant Selenium Nanoparticles (Part I)

2020 ◽  
Vol 44 (2) ◽  
pp. 25-34
Author(s):  
Masar J. Al-Kurdy
Keyword(s):  
Functional Groups ◽  
Color Change ◽  
Selenium Nanoparticles ◽  
X Ray Diffraction ◽  
Black Currant ◽  
Simple Method ◽  
Sem Image ◽  
Red Color ◽  
Vis Spectroscopy

The present study aimed to synthesize selenium nanoparticles (SeNPs) using aqueous extract of black currant as a reducing agent. The green synthesized black currant selenium nanoparticles (BCSeNPs) were identified by color change. The characterization of SeNPs was achieved by Ultraviolet-visible (UV–VIS) spectroscopy, scanning electron microscopy (SEM), X–ray diffraction analysis (XRD), and Fourier transform infrared spectroscopy (FTIR). These tests were used to detect: stability, morphology, size, crystalline nature, and functional groups present on the surface of BCSeNPs. The results revealed appearance of the brick-red color indicating the specific color of selenium nanoparticles, and UV-Vis spectroscopy showed band absorbance at 265 nm of intense surface plasmon resonance manifesting the formation and stability of the prepared BCSeNPs. The SEM image showed the prevalence of spherical selenium nanosized, XRD at 2θ revealed crystallin selenium nanoparticles, the size was in the average of 18-50 nm. Furthermore, FTIR revealed the presence of functional groups of the plant which act as stabilizing and reducing agents. In conclusion, the aqueous black currant extract can act as a reducing and capping agent to synthesize BCSeNPs in nano-scale size by a simple method

scholarly journals BIOSYNTHESIS OF COPPER NANOPARTICLES USING PARTHENIUM HYSTEROPHORUS LEAF EXTRACT AND SCREENING ITS ANTIMICROBIAL ACTIVITY

2019 ◽  
pp. 93-99
Author(s):  
ROHINI SAHAYA MARY ◽  
MAHESH MK ◽  
PRUTHVI ML
Keyword(s):  
Copper Nanoparticles ◽  
Leaf Extract ◽  
Color Change ◽  
Morphological Characteristics ◽  
Antimicrobial Activities ◽  
Parthenium Hysterophorus ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Resonance Band ◽  
High Inhibition

Objective: The aim of this study is to synthesis the copper nanoparticles (CuNPs) using the leaf extract of Parthenium hysterophorus. Methods: Dry and fresh leaf extract was prepared and CuSo4 was added. The color change was noted and recorded by ultraviolet–visible spectrophotometer. The morphological characteristics were analyzed by scanning electron microscopy (SEM). Antimicrobial activities were performed by the disc diffusion method. Results: The color change indicates the production of CuNPs. Surface plasmon resonance band was observed around 599 nm and 572 nm for fresh and dry samples of P. hysterophorus leaf extract. SEM confirms the formation and the crystalline nature of CuNPs and X-ray diffraction studies show the particle size. The antibacterial potentials of the CuNPs were studied and have shown good high inhibition activity against Staphylococcus aureus, Bacillus subtilis, Proteus vulgaris, and Pseudomonas aeruginosa at different concentrations in compare to fungi species. Conclusion: This method is effective and environmental friendly for the synthesis of CuNPs using leaf extract of Parthenium hysterophorus.

Preparation and Characterization of Copper Oxide and Copper Nanoparticles

2011 ◽  
Vol 308-310 ◽  
pp. 715-721 ◽  
Author(s):  
Jun Jun Lv ◽  
Ming Yu Li ◽  
Qing Xuan Zeng
Keyword(s):  
Copper Oxide ◽  
Copper Nanoparticles ◽  
Nitrogen Atmosphere ◽  
X Ray Diffraction ◽  
Oxalate Precursor ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Good Catalytic Activity ◽  
Scanning Electron

Copper oxide was prepared via the calcination of copper oxalate precursor. By using high-temperature solvent method, the precursor decomposed under nitrogen atmosphere and copper nanoparticles were obtained. The microstructure and properties of the products were characterized by scanning electron microscopy, X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectroscopy and other analysis methods. The results show that the obtained copper oxide is constructed by nanoparticles. The sample is porous and has a good catalytic activity. Three copper samples were obtained by controlling the reaction time. The particle size of the samples was calculated to be about 44.3 nm, 17.1 nm and 9.9 nm respectively.

scholarly journals Ranolazine-Functionalized Copper Nanoparticles as a Colorimetric Sensor for Trace Level Detection of As3+

Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 83 ◽  
Author(s):  
Gul Laghari ◽  
Ayman Nafady ◽  
Sameerah Al-Saeedi ◽  
Sirajuddin ◽  
Syed Sherazi ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Color Change ◽  
Cost Effective ◽  
Colorimetric Sensor ◽  
Spherical Particles ◽  
Localized Surface Plasmon ◽  
Force Microscopy ◽  
Highly Sensitive ◽  
Dark Green ◽  
Average Size

This study involves environmentally friendly synthesis of copper nanoparticles in aqueous medium without inert gas protection, using ranolazine as a capping material. UV-Visible (UV-Vis) spectrometry showed that ranolazine-derived copper nanoparticles (Rano-Cu NPs) demonstrate a localized surface plasmon resonance (LSPR) band at 573 nm with brick-red color under optimized parameters, including pH, reaction time, and concentrations of copper salt, hydrazine hydrate, and ranolazine. The coating of ranolazine on the surface of Cu NPs was studied via Fourier transform infrared (FTIR) spectroscopy. Scanning electron microscopy (SEM) revealed that Rano-Cu NPs consist of spherical particles. X-ray diffraction (XRD) verified that Rano-Cu NPs are crystalline in nature. Atomic force microscopy (AFM) showed that the average size of Rano-Cu NPs was 40 ± 2 nm in the range of 22–95 nm. Rano-Cu NPs proved to be highly sensitive as a selective colorimetric sensor for As3+ via color change from brick red to dark green, in the linear range of 3.0 × 10−7 to 8.3 × 10−6 M, with an R² value of 0.9979. The developed sensor is simple, cost effective, highly sensitive, and extremely selective for As3+ detection, showing a low detection limit (LDL) of 1.6 × 10−8 M. The developed sensor was effectively tested for detection of As3+ in some water samples.

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