In situ formation of silver nanoparticles based on dendriticlinear amphiphilic block copolymer micellar templates

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Huiqing Wang ◽  
Ziqiang Shao ◽  
Wenjun Wang ◽  
Feijun Wang
Keyword(s):  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Block Copolymer ◽  
Average Diameter ◽  
Amphiphilic Block Copolymer ◽  
Uv Spectrum ◽  
H Nmr ◽  
Transmission Electron ◽  
Convergent Method ◽  
Absorbance Peak

AbstractDendritic-linear amphiphilic block copolymer, G1-b-PEG, was synthesized through a convergent method. The first generation benzylic dendritic polyether, G1-Cl, was synthesized, and benzylic dendritic polyether, G1-Cl, was used to react with linear monohydroxyl terminated MPEG in alkaline solution via a convergent method. The copolymer was characterized by 1H-NMR. The amphiphilic block copolymer could self-assemble into micelles in aqueous solution, which were used as templates to prepare dispersed silver nanoparticles in water. The morphology and structure of the hybrids were characterized by transmission electron microscopy (TEM) and ultraviolet spectroscopy (UV), 1H-NMR. An absorbance peak at 406 nm appeared after reduction in the UV spectrum. The average diameter of G1-B-PEG /Ag hybrid micelles was 186 nm, and the sliver nanoparticles are stable in aqueous solution due to the stabilization of the dendritic-linear micelles.

scholarly journals 1H NMR Study of Self-assembly of Dendr.PE-PAA,an Amphiphilic Block Copolymer in Aqueous Solution

2001 ◽  
Vol 17 (08) ◽  
pp. 743-746
Author(s):  
Mao Shi-Zhen ◽  
◽  
Wang Tian-Zhi ◽  
Miao Xi-Jia ◽  
Fang Xiao-Wen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Block Copolymer ◽  
Self Assembly ◽  
Amphiphilic Block Copolymer ◽  
H Nmr ◽  
Nmr Study

Preparation of Triangular Silver Nanoparticles Using Polyvinyl Pyrrolidone with Different Concentration

2013 ◽  
Vol 873 ◽  
pp. 206-210
Author(s):  
Kai Li ◽  
Rao Fu ◽  
Qing Ran Gao ◽  
Ai Wei Tang ◽  
Ying Feng Wang
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Driving Force ◽  
Ostwald Ripening ◽  
Polyvinyl Pyrrolidone ◽  
Protective Agent ◽  
Ag Nps ◽  
Transmission Electron ◽  
Uv Visible

This paper continues our previous work on preparation of triangular silver nanoparticles. The method proceeds with reaction of silver nitrate with hydrazine hydrate in the presence of polyvinyl pyrrolidone in aqueous solution. Effects of the concentration of PVP on the morphologies of Ag NPs were systematically investigated. The obtained Ag NPs were characterized by transmission electron microscopy and UV-visible spectrophotometer. The results showed that, triangular Ag NPs with edge lengths in the range of 50-200 nm were obtained using PVP as protective agent with lower concentration. As the concentration of PVP increased, spherical Ag NPs with their sizes about 6.2 nm were prepared and triangular Ag NPs were not obtained. The formation mechanism of triangular Ag NPs has been studied. Ostwald ripening is the driving force on the conversion of spherical Ag NPs to triangular Ag NPs in the presence of PVP.

Effect of Laser Fluence on Siliver Nanoparticles Colloid

2011 ◽  
Vol 415-417 ◽  
pp. 747-750
Author(s):  
Bing Xu ◽  
Ren Guo Song ◽  
Chao Wang
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Laser Fluence ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Average Diameter ◽  
Distilled Water ◽  
Transmission Electron ◽  
Silver Target

In order to study the effects of laser fluence on silver nanoparticles colloid, the silver nanoparticles colloid was prepared by pulsed laser ablation of silver target for 10min in distilled water at different laser fluence. The particles size，morphologies and absorption spectroscopy of the obtained nanoparticles colloid were characterized by ultraviolet to visible (UV-Vis) spectrometer and transmission electron microscopy (TEM), the average diameter and its distribution were analyzed by Image-ProPlus software. The results shown that the average diameter of the silver nanoparticles prepared at the laser fluence of 4.2J/cm2 was the smallest (D=17.54nm), also, the distribution of particle size was narrowest (=36.86nm) and the morphologies were more homogeneous. It was confirmed that the nanoparticles size and shape could be controlled by pulsed laser ablation parameters.

In situformation of Ag flowerlike and dendritic nanostructures in aqueous solution and hydrolysis of an amphiphilic block copolymer

2005 ◽  
Vol 16 (10) ◽  
pp. 2048-2051 ◽  
Author(s):  
Wei-Tai Wu ◽  
Wenmin Pang ◽  
Guoyong Xu ◽  
Lei Shi ◽  
Qingren Zhu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Block Copolymer ◽  
Amphiphilic Block Copolymer ◽  
Dendritic Nanostructures ◽  
Hydrolysis Of

scholarly journals Preparation of Silver Nanostructures from Bicontinuous Microemulsions

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
M. A. Pedroza-Toscano ◽  
M. Rabelero-Velasco ◽  
R. Díaz de León ◽  
H. Saade ◽  
R. G. López ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Average Length ◽  
Sodium Dodecylsulfate ◽  
Average Diameter ◽  
Silver Nanostructures ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Reverse Microemulsions

Precipitation of silver nanoparticles at 70°C was carried out by dosing a 1.3 M sodium borohydride aqueous solution over bicontinuous microemulsions formed with a mixture of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and sodium dodecylsulfate (SDS) as surfactants, a 0.5 M silver nitrate aqueous solution, and toluene. Weight ratios of 2.5/1 and 3/1 AOT/SDS were used in the precipitation reactions. Silver nanoparticles were characterized by transmission electronic microscopy, X-ray diffraction, and atomic absorption spectroscopy. A mixture of isolated spheroidal nanoparticles (≈15 wt.%) with an average diameter around 10 nm and wormlike structures (≈85 wt.%) with an average length close to 480 nm and an average diameter ca. 40 nm was obtained, regardless of the AOT/SDS ratio. Higher yields were obtained compared with those reported when reverse microemulsions were employed. Formation of wormlike structures was ascribed to one-dimensional aggregation of crystal and particles within the channels of bicontinuous microemulsions, which performed as templates.

scholarly journals Synthesis Optimisation of Lysozyme Monolayer-Coated Silver Nanoparticles in Aqueous Solution

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
A. V. Yakovlev ◽  
O. Yu. Golubeva
Keyword(s):  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Synthesis Temperature ◽  
Reactant Ratio ◽  
Mass Ratio ◽  
Coating Agent ◽  
Bioactive Coating ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Distribution Parameters

This paper presents an optimisation of the synthesis of silver nanoparticles encapsulated in a biological shell. The synthesis was carried out in an aqueous solution of silver nitrate. Sodium borohydride was used as a reducing agent. Lysozyme served as a bioactive coating agent. The samples produced were studied using dynamic light scattering, transmission electron microscopy, and UV-Vis spectroscopy. The function of the dependence of the reagent ratio in obtained sols on optical properties is shown. Furthermore, the influence of the synthesis temperature, reactant ratio, and order of mixing on the particle size distribution parameters is shown. The optimal reagent mass ratio, NaBH4 : LYZ : AgNO3 = 0.22 : 0.77 : 1, is established. The resulting composition allows the synthesis of particles with a mean diameter of 18 nm and a bioshell thickness of ≈3.5 nm. Moreover, the necessity of the synthesis optimisation and precise parameter control is clearly demonstrated.

Evaluation of the Colorimetric Performance of Unmodified Citrate-Stabilized Silver Nanoparticles for Copper (II) Sensing in Water

2019 ◽  
Vol 821 ◽  
pp. 372-378
Author(s):  
Francis Eric P. Almaquer ◽  
Jem Valerie D. Perez
Keyword(s):  
Silver Nanoparticles ◽  
Trisodium Citrate ◽  
Average Diameter ◽  
Nanoparticle Aggregation ◽  
Tem Analysis ◽  
Additional Peak ◽  
Linear Fit ◽  
Sensing Application ◽  
Absorbance Peak ◽  
Detection And Quantification

In this study, the colorimetric performance of unmodified citrate-stabilized silver nanoparticles (cit-AgNP) for Cu2+ detection was investigated. Cit-AgNP was successfully synthesized using the modified Creighton method with sodium borohydride as reducing agent and trisodium citrate as stabilizing agent. The resulting nanoparticle was yellow in color, characteristic of AgNP. The absorbance peak was determined at 400 nm using UV Vis analysis while for morphology, the particles were spherical in shape with an average diameter of 11 nm determined by TEM analysis. In the presence of increasing Cu2+ concentration, the yellow cit-AgNP turned orange and showed decreasing absorbance at 400 nm with simultaneous emergence of additional peak at 450 nm. These changes were attributed to the nanoparticle aggregation confirmed by TEM analysis. A calibration curve generated showed that the absorbance ratio 450/400 nm is directly proportional to Cu2+ concentration from 0 to 40x10-4 M with good linear fit at R2 = 0.9749. The detection and quantification limits were determined to be 6.59x10-4 M and 21.97x10-4 M, respectively. Overall, the study demonstrated the potential of the assay for Cu2+ sensing application.

scholarly journals Development and Characterization of Biocompatible Fullerene [C60]/Amphiphilic Block Copolymer Nanocomposite

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Alok Chaurasia ◽  
Nanda Gopal Sahoo ◽  
James T. McLeskey ◽  
Xiao Hu
Keyword(s):  
Aqueous Solution ◽  
Block Copolymer ◽  
Complex Formation ◽  
Toluene Solution ◽  
Cytotoxicity Test ◽  
Transmission Electron ◽  
Evaporation Technique ◽  
Polymer Colloid ◽  
Particle Size And Morphology ◽  
Size And Morphology

We report a supramolecular process for the synthesis of well-defined fullerene (C60)/polymer colloid nanocomposites in an aqueous solution via complex formation. A biocompatible triblock poly(4-vinylpyridine)-b-polyethylene-b-poly(4-vinylpyridine), P4VP8-b-PEO105-b-P4VP8, was synthesized by atom transfer radical polymerization. The block copolymer formed complexes with C60in toluene and resulted in fullerene assembly in cluster form. Nanocomposite dispersion in an aqueous solution could be obtained using an aged solution of the polymer/C60/toluene solution by a solvent evaporation technique. The UV-Vis and FTIR spectroscopy confirmed the complex formation of fullerene with the polymer which plays a significant role in controlling the PDI and size of polymer/C60micelles in the toluene solution. The particle size and morphology of P4VP8-b-PEO105-b-P4VP8and P4VP8-b-PEO105-b-P4VP8/C60mixture were studied by dynamic light scattering (DLS) and transmission electron microscopy (TEM). In a cytotoxicity test, both pure polymer and the resulting polymer/C60composite in water showed more than 90% cell viability at 1 mg/mL concentration.

scholarly journals Investigation of the Larvicidal Potential of Silver Nanoparticles againstCulex quinquefasciatus: A Case of a Ubiquitous Weed as a Useful Bioresource

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Elijah T. Adesuji ◽  
Omolara O. Oluwaniyi ◽  
Haleemat I. Adegoke ◽  
Roshila Moodley ◽  
Ayomide H. Labulo ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Volume Ratio ◽  
Average Diameter ◽  
Environmentally Benign ◽  
X Ray ◽  
Transmission Electron ◽  
Aqueous Leaf Extract ◽  
Temperature Time ◽  
Filariasis Vector

Biosynthesized silver nanoparticles (AgNPs) usingCassia hirsutaaqueous leaf extract were reported in this study. The synthesis was optimized by measuring various parameters such as temperature, time, volume ratio, and concentration. The surface plasmon resonance at 440 nm for 30°C and 420 nm for both 50°C and 70°C measured using the UV-Vis spectrophotometer confirmed the formation of AgNPs synthesized usingC.hirsuta(CAgNPs). The functional groups responsible for the reduction and stabilization of the NPs were identified using Fourier Transform Infrared (FTIR). The morphology, size, and elemental composition of the NPs were obtained using scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive X-ray spectroscopy (EDX). X-ray diffractometer was used to identify the phases and crystallinity of CAgNPs. Crystalline spherical NPs with average diameter of 6.9 ± 0.1 nm were successfully synthesized. The thermal analysis of CAgNPs was observed from DSC-TGA. The larvicidal results against the different larva instar stage ofCulex quinquefasciatusgave LC50= 4.43 ppm and LC90= 8.37 ppm. This is the first study on the synthesis of AgNPs usingC.hirsutaand its application against lymphatic filariasis vector. Hence, it is suggested that theC.hirsutasynthesized AgNPs would be environmentally benign in biological control of mosquito.

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