Paper Title:
Simultaneously Synthesis and Encapsulation of Metallic Nanoparticles Using Linear–Dendritic Block Copolymers of Poly(ethylene glycol)-Poly(citric acid)
  Abstract

Linear-dendritic triblock copolymers of linear poly(ethylene glycol) and hyperbranched poly(citric acid) (PCA-PEG-PCA) were used as the reducing and capping agents to encapsulate gold and silver nanoparticles (AuNPs and AgNPs). PCA-PEG-PCA copolymers in four different molecular weights were synthesized using 2, 5, 10 and 20 citric acid/PEG molar ratios and were called A1, A2, A3 and A4, respectively. Nanoparticles were encapsulated simultaneously during the preparation process. AuNPs were simply synthesized and encapsulated by addition a boiling aqueous solution of HAuCl4 to aqueous solutions of A1, A2, A3 and A4. In the case of silver, an aqueous solution of AgNO3 was reduced using NaBH4 and AgNPs were encapsulated simultaneously by adding aqueous solutions of different PCA-PEG-PCA to protect the fabricated silver nanoparticles from aggregation. Encapsulated AuNPs and AgNPs were stable in water for several months and agglomeration did not occur. The synthesized silver and gold nanoparticles have been encapsulated within PCA-PEG-PCA macromolecules and have been studied using Transmission Electron Microscopy (TEM) and UV/Vis absorption spectroscopy. Studies reveal that there was a reverse relation between the size of synthesized AuNPs/AgNPs and the size of citric acid parts of PCA-PEG-PCA copolymers. For example, the prepared gold and silver nanoparticles by A3 copolymer are of an average size of 8 nm and 16 nm respectively. Finally, the loading capacity of A1, A2, A3 and A4 and the size of synthesized AuNPs and AgNPs were investigated using UV/Vis data and the corresponding calibration curve. It was found that the loading capacity of copolymers depends directly on the concentration of copolymers and their molecular weight.

  Info
Periodical
Edited by
Andreas Öchsner, Lucas F.M. da Silva and Holm Altenbach
Pages
7-12
DOI
10.4028/www.scientific.net/KEM.478.7
Citation
A. Tavakoli Naeini, M. Vossoughi, M. Adeli, "Simultaneously Synthesis and Encapsulation of Metallic Nanoparticles Using Linear–Dendritic Block Copolymers of Poly(ethylene glycol)-Poly(citric acid)", Key Engineering Materials, Vol. 478, pp. 7-12, 2011
Online since
April 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hyun Su Min, Hong Jae Lee, Sang Cheon Lee, Kyoung Hoon Kang, Jae Hwi Lee, Ki Nam Park, Kang Moo Huh
Abstract:Hydrotropic block copolymers, consisting of a hydrophilic poly(ethylene glycol) (PEG) block and a hydrotropic polymer, poly(2-(4-(vinyl...
421
Authors: Yang Yen Yu, Wen Chen Chien, Yu Heng Chou
Abstract:In this study, block copolymers of PS-b-PMSMA with various molecular weight were synthesized by atom transfer radical polymerization (ATRP)....
887
Authors: Xin De Tang, Xiao Chano Liang, Nian Feng Han
Abstract:Novel Y-shaped amphiphilic block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide), PEG-b-(PNIPAM)2, were successfully...
1623
Authors: Xin De Tang, Nian Feng Han, De Jie Zhou
Abstract:Photo- and temperature-responsive amphiphilic block copolymers, poly(ethylene...
47
Authors: Ke Xin Kang, Min Ying Liu, Qing Xiang Zhao, Peng Fu, Xiao Bing Wang
High Performance Elastomers & Polymers
Abstract:A series of amphiphilic block copolymers mPEO-b-PCL with different PCL molecular weight were successfully prepared by combination of...
1877