Preparation and characterization of silver nanoparticles by chemical reduction method

Khan, Zaheer; Al-Thabaiti, Shaeel A.; Obaid, Abdullah Y.; Al‐Youbi, Abdulrahman O.

doi:10.1016/j.colsurfb.2010.10.008

Cited by 251 publications

(128 citation statements)

References 40 publications

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“…The solution was heated to 40 °C and stirred for 0.5 h. Honey yellow coloured silver nanoparticle and wine red coloured copper nanoparticle which are spherical and highly monodispersed were obtained respectively. The nanoparticles in the suspensions are stored in N 2 for future use and they are characterized using HRTEM, SEM and EDX measurements [34][35][36][37][38][39][40][41][42][43][44][45].…”

Section: Synthesis Of Silver Nanoparticle and Copper Nanoparticlementioning

confidence: 99%

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Vasumathi¹,

Santhanalakshmi²

2018

Asian J. Chem.

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INTRODUCTIONInvention of non-invasive in vivo biosensors is today's necessity in diagnostics, medical analysis and therapy [1,2]. Detection and estimation of sugars in biological systems attract the attention of medical engineers. When protein-carbohydrate interactions are studied and established in presence of silver and copper nanoparticles, new immunotherapeutic strategies may be discovered in the treatment of malignant diseases [3]. In this paper the studies on the interaction of silver nanoparticles (AgNP) and copper nanoparticles (CuNP) with milk protein, β-casein (BCA) is quantitatively described using fluorescence quenching measurements. The interaction studies between the protein and the nanoparticles (Pro-NP) are extensively studied in presence of various monosaccharide and disaccharide sugars like glucose, fructose, galactose, sucrose, maltose and lactose. The protein β-casein (BCA) exhibits a strong fluorescence emission, which is sensitive to active quenchers. Metal nanoparticles like copper nanoparticles and silver nanoparticles with enhanced and unique properties are reported to quench protein fluorescence appreciably. In the present work, the fluorescence quenching effects of metal nanoparticles on the protein fluorescence are extensively studied in presence of various sugar molecules. This may play a significant role in the sensing applications of sugar molecular systems in the presence of metal nanoparticles. β-Casein is used as fluorophore and sugar molecular systems like sucrose, maltose, fructose, lactose, galactose and glucose are chosen as quenchers and the protein-sugar interactions are arrived from fluorescence quenching results in the presence of copper nanoparticles and silver nanoparticles. To find the role of life time on the intensity of fluorescence, time resolved fluorescence measurements for the protein-sugar systems in the presence and absence of nanoparticles is measured. The proteinnanoparticles-sugar fluorescence interactions are analyzed by using Stern-Volmer plots and thermodynamic plots using fluorescence intensity quenching data. The trends in the extent of quenching action on protein fluorescence and also the binding interactions among protein sugar systems are quantified in the presence of copper nanoparticles and silver nanoparticles separately, in terms of Stern-Volmer constant values and binding constants values. β-Casein is found to interact strongly with the quenchers in the presence of copper nanoparticle and silver nanoparticle. Silver nanoparticle is read to be a better quenching mediator than copper nanoparticle for the fluorescence intensity in molecular interactions. Order of sugars quenching the protein fluorescence in presence of the nanoparticles is found.

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Section: Synthesis Of Silver Nanoparticle and Copper Nanoparticlementioning

confidence: 99%

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Vasumathi¹,

Santhanalakshmi²

2018

Asian J. Chem.

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“…1 Silver nanoparticles have been applied in many fields including photonics, micro-electronics, photocatalysis, lithography, and surface-enhanced Raman spectroscopy. 2,3 Several types of chemical and physical technologies, such as chemical reduction, [4][5][6] electrochemical reduction, [7][8][9] photochemical reduction, [10][11][12] and heat evaporation 13,14 have been developed for the synthesis of silver nanoparticles. In recent years, bio-or green-synthesis of silver nanoparticles has become an emerging science.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and anti-fungal effect of silver nanoparticles–chitosan composite particles

Wang

Yang

et al. 2015

IJN

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Silver nanoparticles have been used in various fields, and several synthesis processes have been developed. The stability and dispersion of the synthesized nanoparticles is vital. The present article describes a novel approach for one-step synthesis of silver nanoparticles–embedded chitosan particles. The proposed approach was applied to simultaneously obtain and stabilize silver nanoparticles in a chitosan polymer matrix in-situ. The diameter of the synthesized chitosan composite particles ranged from 1.7 mm to 2.5 mm, and the embedded silver nanoparticles were measured to be 15±3.3 nm. Further, the analyses of ultraviolet-visible spectroscopy, energy dispersive spectroscopy, and X-ray diffraction were employed to characterize the prepared composites. The results show that the silver nanoparticles were distributed over the surface and interior of the chitosan spheres. The fabricated spheres had macroporous property, and could be used for many applications such as fungicidal agents in the future.

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“…The bare silica colloids do not show any UV-Vis absorption in the range of 300 nm to 800 nm, but the core-shell composites show an obvious absorption peak at around 418 nm due to the Mie plasmon resonance excitation from the silver nanoparticles on the surface of SiO 2 . Compared to pure Ag NPs, the absorption peak shifts from ∼400 nm to 418 nm [20,21]. The possible reason for the red shift can be attributed to much larger size of silver nanoparticles and higher coverage on the silica surface as indicated in Fig.…”

Section: Uv-vis Spectroscopy Analysismentioning

confidence: 93%

Core-shell SiO₂/Ag composite spheres: synthesis, characterization and photocatalytic properties

Jia

Wang

et al. 2016

Materials Science-Poland

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Core-shell SiO 2 /Ag composite spheres with dense, complete and nanoscaled silver shell were prepared by using a novel facile chemical reduction method without surface modification of silica at room temperature. The core-shell composites were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy and energy dispersive X-ray spectroscopy (EDX). The photocatalytic properties towards the degradation of methyl orange (MO) of the prepared SiO 2 /Ag composites were also tested. The studies showed that the surface of SiO 2 microspheres was homogeneously and completely covered by Ag nanoparticles and the composite exhibited excellent photocatalytic activities. The possible reaction mechanisms for the formation of the silica-silver core-shell spheres were also discussed in this paper.

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Preparation and characterization of silver nanoparticles by chemical reduction method

Cited by 251 publications

References 40 publications

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Synthesis and anti-fungal effect of silver nanoparticles–chitosan composite particles

Core-shell SiO₂/Ag composite spheres: synthesis, characterization and photocatalytic properties

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Preparation and characterization of silver nanoparticles by chemical reduction method

Cited by 251 publications

References 40 publications

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Synthesis and anti-fungal effect of silver nanoparticles&ndash;chitosan composite particles

Core-shell SiO2/Ag composite spheres: synthesis, characterization and photocatalytic properties

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Synthesis and anti-fungal effect of silver nanoparticles–chitosan composite particles

Core-shell SiO₂/Ag composite spheres: synthesis, characterization and photocatalytic properties