Cysteine Interactions in Glutathione Mediated Assembly of Silver Nanoparticles in the Presence of Metal Ions

2012 ◽  
Vol 18-19 ◽  
pp. 63-76 ◽  
Author(s):  
Can Serkan Keskin ◽  
Semra Yılmazer Keskin ◽  
Abdil Özdemir
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Complex Formation ◽  
Metal Ions ◽  
Metal Ion ◽  
Variable Degree ◽  
Ordered Structures ◽  
Vis Spectroscopy ◽  
Ligand Interactions ◽  
New Material

We Report Herein Results of an Investigation of the Assembly of Silver Nanoparticles Mediated by Glutathione (GSH) and Cysteine (Cys) Interaction in the Presence of Metal Ions: Ag+, Cd2+, Co2+, Cu2+, Fe3+, Hg2+, Ni2+, Pb2+, Zn2+. The Silver Nanoparticles Produce Well-Ordered Structures upon Interaction with Glutathione in Variable Acidic Ph Condition and Exhibit Pronounced Changes in their Optical Properties Arising due to Electromagnetic Interaction. The Effect of Selected Metal Ions on the Nature of Complexation as Well as the Variation in the Optical Response due to Variable Degree of Complex Formation Amongst the Particles Have Been Investigated. The Changes in Optical Properties of the Silver Nanoparticles Have Been Accounted for the Complex Formation among the Aggsh, Cys and Metal Ions. The Complexes Have Been Characterized by UV-Vis Spectroscopy, FTIR, and AFM Studies. It Has Been Observed that the New Absorption Peaks Appear and Intensifies Depending on the Cys and Metal Ion Interaction. The Aggsh Nanoparticles Provided a Simple and Rapid Strategy to Detect Cys with the Aid of Metal Ions in Aqueous Solution. Different Metal Ions Give Different UV-Vis Spectra Profile and Show Different Sensitivity. This New Material Allows a Quantitative Assay of Cys down to the Concentration of 1× 10−5 M in Co2+ Ion Complexation. The Mechanism by which Metal Ions Can Bind with both the GSH Modified Ag Nanoparticles and Cys Molecule through Cooperative Metal–ligand Interactions Is Discussed.

Adsorption of Cu2+ Metal Ions on Dithizone-Immobilized Natural Bentonite

2020 ◽  
Vol 840 ◽  
pp. 64-70
Author(s):  
Dian Mira Fadela ◽  
Mudasir Mudasir ◽  
Adhitasari Suratman
Keyword(s):  
Adsorption Isotherm ◽  
Complex Formation ◽  
Metal Ions ◽  
Electrostatic Interaction ◽  
Metal Ion ◽  
Synthesis And Characterization ◽  
Optimum Conditions ◽  
Initial Concentration ◽  
Activated Bentonite

The research of adsorption of Cu2+ metal ion on dithizone-immobilized natural bentonite (DNB) had been carried out. The experiment was begun by the activation of natural bentonite with HCl 4 M and dithizone-immobilized on activated bentonite surface. This study included synthesis and characterization of dithizone-immobilized bentonite and its application in adsorption of Cu2+ metal ions. The type of interaction occurred in the adsorption was tested by sequential desorption. The result showed that dithizone successfully immobilized on activated natural bentonite (ANB). The optimum conditions for Cu2+ metal ions adsorption using dithizone-immobilized natural bentonite are at pH 5; 0.1 g mass of adsorbent, with interaction time 60 min, and the initial concentration of ion at 80 ppm. Kinetics and adsorption isotherm studies suggest that the capacity, of the dithizone-immobilized natural bentonite in adsorbing Cu2+ metal ion is significantly improved compared to activated natural bentonite. The adsorption of Cu2+ metal ions by activated natural bentonite was through several interactions dominated by electrostatic interaction (82%). Otherwise, the interaction of dithizone-immobilized natural bentonite with Cu2+ metal ions in the sequence were dominated by the mechanism of complex formation of (75%). The result shows that the immobilization of dithizone changes the type of electrostatic interaction into complex formation.

Influence of Oxygen on the Optical Properties of Silver Nanoparticles

2008 ◽  
Vol 8 (12) ◽  
pp. 6545-6550 ◽  
Author(s):  
V. M. Rentería-Tapia ◽  
J. García-Macedo
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Metallic Nanoparticles ◽  
Silver Oxide ◽  
Sol Gel ◽  
Oxygen Atmosphere ◽  
Oxide Shell ◽  
Metallic Surface ◽  
Oxidizing Atmosphere ◽  
Vis Spectroscopy

Silver nanoparticles in sol–gel silica films were obtained by annealing in hydrogen atmosphere and subsequently in oxygen atmosphere. Their properties were measured by UV-vis spectroscopy, transmission electron microscopy (TEM), high-resolution transmission electronic microscopy (HRTEM) and X-ray diffraction analysis. Samples prepared in a reducing atmosphere exhibited a surface plasmon resonance (SPR) located at 399 nm. Silver nanoparticles in an oxidizing atmosphere exhibited a red shift and damping of the SPR. These optical properties were explained due to the oxidation on the surface of silver nanoparticles to silver oxide yield in an oxygen atmosphere. Silver core–silver oxide shell nanostructures were observed by HRTEM. The average size of the metallic nanoparticles obtained by TEM was used for modeling the UV-vis spectra by using the Gans theory. Good fits to the spectra under an oxidizing atmosphere were obtained considering variable refractive indexes coming from the silver oxide shells surrounding to the nanoparticles. Therefore, the interaction between oxygen and the metallic surface of the nanoparticles, sensitively alters their optical properties.

scholarly journals One pot synthesis of silver nanoparticles using a cyclodextrin containing polymer as reductant and stabilizer

2014 ◽  
Vol 5 ◽  
pp. 380-385 ◽  
Author(s):  
Arkadius Maciollek ◽  
Helmut Ritter
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Optical Properties ◽  
Silver Nitrate ◽  
Room Temperature ◽  
One Pot ◽  
One Pot Synthesis ◽  
Transmission Electron ◽  
Vis Spectroscopy

A facile and one pot synthesis of silver nanoparticles with narrow size distributions using silver nitrate and a copolymer 1 from N-isopropylacrylamide (NIPAM) and mono-(1H-triazolylmethyl)-2-methylacryl-β-cyclodextrin acting as reductant and stabilizer without using any additional reducing agent is reported. The reduction was carried out in aqueous solution under pH neutral conditions at room temperature. The results of dynamic light scattering analysis and transmission electron microscopy show adjustable particle sizes from 30–100 nm, due to variation of silver nitrate concentration, the polymeric reducing and stabilisation agent concentration or reaction time. The spherical structure of the silver nanoparticles has been confirmed by UV–vis spectroscopy and transmission electron microscopy. The optical properties of the nanoparticles have also been characterized by fluorescence spectroscopy. The formed spherical particles are stable in aqueous medium at room temperature over a period of several weeks. Furthermore the changes in the optical properties of the nanoparticles due to thermo induced volume phase transition behavior of the thermoresponsive cyclodextrin containing polymer 1 have been characterized by UV–vis spectroscopy.

scholarly journals Formation and optical properties of metal/10-hydroxybenzo[h]quinolone complexes in the interlayer spaces of magadiite by solid–solid reactions

2018 ◽  
Vol 5 (5) ◽  
pp. 171732
Author(s):  
Yifu Zhang ◽  
Shengnan Gao ◽  
Hanmei Jiang ◽  
Qiushi Wang ◽  
Yan Cheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Complex Formation ◽  
Metal Ions ◽  
Interlayer Space ◽  
Metal Cations ◽  
Molecular Packing ◽  
Current Work ◽  
Intercalated Compounds ◽  
Coordination Ability

Intercalation and in situ formation of three fluorescent complexes, Al(III)-, Cr(III)- and Cu(II)-10-hydroxybenzo[h]quinolone (M-HBQ, M = Al, Cr and Cu), in the interlayer spaces of magadiite (mag) were studied by solid–solid reactions between metal ions exchanged mags (M-mag, M = Al, Cr and Cu) and HBQ. Results show that the basal spacings of the intercalated composites increase after the intercalation of HBQ into M-mags. The amount of HBQ in the intercalated compounds is different due to the amount of metal ions and the diversification of coordination ability of metal ions, and the order of the coordination ability of these three metal ions is Cu 2+  > Cr 3+  > Al 3+ . The amount of the metal cations in the interlayer of mag is enough for the in situ complex formation of M-HBQ complexes. The slight shift of the absorption and luminescence bands of the complexes suggests the different microstructures, including molecular packing of the complexes in the interlayer spaces of mags, resulting that the host–guest interactions are formed. These findings show that the intercalation and in situ formation of M-HBQ complexes (M = Al, Cr and Cu) in the interlayer space of mag are successfully achieved in the current work.

scholarly journals Optical properties of selected 4d and 5d transition metal ion-doped glasses

RSC Advances ◽  
2017 ◽  
Vol 7 (42) ◽  
pp. 26411-26419 ◽  
Author(s):  
Hongli Wen ◽  
Bing-Ming Cheng ◽  
Peter A. Tanner
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Oxidation States ◽  
Transition Metal Ion ◽  
Doped Glasses

Charge transfer emission from transition metal ions in glasses and identification of their oxidation states.

Silver Nanocolloid: Synthesis, Optical and Thermo-Optical Properties

2013 ◽  
Vol 829 ◽  
pp. 670-674 ◽  
Author(s):  
Sakineh Hashemizadeh ◽  
Majid Rashidi Huyeh
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Extinction Spectrum ◽  
Noble Metal Nanoparticles ◽  
Shape Effect ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Different Temperatures ◽  
Two Peaks ◽  
Silver Nanocolloid

Linked to Surface Plasmon Resonance (SPR) phenomena, optical and thermo-optical properties of metal-dielectric nanocomposite materials including noble metal nanoparticles dispersed in a dielectric host medium are worthily interested. Indeed these materials have been proposed for many applications such as photonics devices, bio sensors and even photo-thermal therapy. Colloidal silver nanoparticles were synthesized by reduction of silver nitrate using of ascorbic acid and citrate as stabilizer agent in a 30°C water bath. The transmission electron microscopy (TEM) micrograph image shows formation of spheroidal silver nanoparticles with an average of large and small diameters about 43 and 34 nm respectively. Extinction spectrum, measured using UV-Vis spectroscopy, represented two peaks located around 420 and 620 nm of wavelength. These peaks are attributed to SPR phenomena and confirm spheroidal and spherical silver nanoparticle formation in solution. Thermo-optical properties of synthesized silver nanocolloids are then evaluated by measuring of extinction spectrum at different temperatures. Results showed an enhancement in thermo-optical properties of silver nanocolloids around the SPR wavelengths. Theoretical analysis, done using Mie and Mie-Gans theories, showed that the different peaks observed in extinction spectrum are related directly to shape effect.

Engineering the electronic structure and optical properties of g-C3N4 by non-metal ion doping

2016 ◽  
Vol 4 (28) ◽  
pp. 6839-6847 ◽  
Author(s):  
Qianyi Guo ◽  
Yuanhao Zhang ◽  
Jianrong Qiu ◽  
Guoping Dong
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Metal Ions ◽  
Metal Ion ◽  
Carbon Nitride ◽  
Emission Spectra ◽  
Ion Doping ◽  
Pl Emission

The normalized PL emission spectra of graphite-like carbon nitride (g-C3N4) modified with different non-metal ions (boron and sulfur) exhibit interesting scientific variation.

scholarly journals PHYTOSYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM RUELLIA TUBEROSA (L.): EFFECT OF PHYSICOCHEMICAL PARAMETERS

2021 ◽  
pp. 31-38
Author(s):  
HARIKA M ◽  
RADHIKA P
Keyword(s):  
Silver Nanoparticles ◽  
Metal Ion ◽  
Incubation Temperature ◽  
Ion Concentration ◽  
Gas Chromatography Mass Spectrometry ◽  
Face Centered Cubic ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Vis Spectroscopy ◽  
Tuber Extract

Objective: The current study focused on synthesizing silver nanoparticles (AgNPs) using Ruellia tuberosa aqueous tuber extract (RTTE) and silver nitrate (AgNO3) solution. Methods: AgNPs were synthesized using an aqueous tuber extract of the medicinal herb R. tuberosa (L.). The existence of significant phytoconstituents involved in synthesizing the AgNPs was determined using the gas chromatography–mass spectrometry (GC–MS) study. We evaluated the physical and chemical parameters such as the effect of time, temperature, metal ion concentration, crude aqueous tuber extract concentration, and pH in the synthesis of nanoparticles. The AgNPs were characterized using ultraviolet (UV)–Vis spectroscopy, field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscope (HRTEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) techniques. Results: R. tuberosa tuber extract was rich in various phytochemical constituents which were identified by GC–MS. For biosynthesis, the optimal values were 1 mM AgNO3concentration, 0.1 mL of aqueous tuber extract, and a 40 min incubation temperature of 70°C. The existence of a characteristic surface plasmon resonance (SPR) peak at 421 nm indicated the biosynthesis of AgNPs using UV–Vis spectroscopy. At higher temperatures and alkaline pH, the development of AgNPs increased overtime and remained stable up to 4 weeks. FESEM, EDX, HRTEM, SAED, and XRD analysis revealed that most AgNPs were spherical, with an average size distribution of 34.9 nm and a crystalline phase, face-centered cubic lattice. Infrared (FTIR) spectroscopic analysis revealed that hydroxyl and amino functional groups were involved in the biosynthesis and stabilization of AgNPs. Conclusion: The synthesis of AgNPs from R. tuberosa aqueous tuber extract was a cost-effective process and environmental friendly.

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